BIT Mining Limited (BTCM) 20-F14 Apr 212020 FY Annual report (foreign)Financial data

Company Profile

Document and Entity Information

Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2020shares
Entity Information [Line Items]
Document Type	20-F
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Entity File Number	001-36206
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	BIT Mining Limited
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	14F, West Side, Block B, Building No. 7
Entity Address, Address Line Two	Shenzhen Bay Eco-Technology Park
Entity Address, Address Line Three	Nanshan District
Entity Address, City or Town	Shenzhen
Entity Address, Postal Zip Code	518115
Entity Address, Country	CN
Entity Central Index Key	0001517496
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Document Accounting Standard	U.S. GAAP
ICFR Auditor Attestation Flag	false
Business Contact [Member]
Entity Information [Line Items]
Entity Address, Address Line One	14F, West Side, Block B, Building No. 7
Entity Address, Address Line Two	Shenzhen Bay Eco-Technology Park
Entity Address, Address Line Three	Nanshan District
Entity Address, City or Town	Shenzhen
Entity Address, Postal Zip Code	518115
Entity Address, Country	CN
Contact Personnel Name	Qiang Yuan
Class A Ordinary shares [Member]
Entity Information [Line Items]
Title of 12(b) Security	Class A ordinary shares, par value US$0.00005 per share
Entity Common Stock, Shares Outstanding	430,127,692
Class B Ordinary shares [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	99
American Depositary Shares [Member]
Entity Information [Line Items]
Title of 12(b) Security	American Depositary Shares, each representing ten (10) Class A ordinary shares
Trading Symbol	WBAI
Security Exchange Name	NYSE

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Current assets:
Cash and cash equivalents	¥ 308,676	$ 47,307	¥ 361,220
Restricted cash	3,829	587	4,576
Time deposits			23,849
Amounts due from a related party	368	56	10,401
Prepayments and other receivables, net	22,980	3,522	30,280
Total current assets	335,853	51,472	430,326
Non-current assets:
Property and equipment, net	19,779	3,031	64,112
Intangible assets, net	2,398	368	4,505
Deposits	1,480	227	5,388
Long-term investments	99,972	15,321	152,954
Right-of-use assets	9,327	1,429	36,607
Other non-current assets	1,664	255	1,887
Total non-current assets	134,620	20,631	265,453
TOTAL ASSETS	470,473	72,103	695,779
Current liabilities:
Accrued payroll and welfare payable (including accrued payroll and welfare payable of the consolidated VIEs without recourse to BIT Mining Limited of RMB4,830 and RMB12,288 (US$1,883) as of December 31, 2019 and 2020, respectively)	13,401	2,054	6,879
Operating lease liabilities - current (including operating lease liabilities - current of the consolidated VIEs without recourse to BIT Mining Limited of RMB13,698 and RMB3,710 (US$569) as of December 31, 2019 and 2020, respectively)	3,710	569	16,672
Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to BIT Mining Limited of RMB36,087 and RMB36,870 (US$5,651) as of December 31, 2019 and 2020, respectively)	55,960	8,577	51,398
Income tax payable (including income tax payable of the consolidated VIEs without recourse to BIT Mining Limited of RMB1,525 and nil as of December 31, 2019 and 2020, respectively)	549	84	2,213
Total current liabilities	73,620	11,284	77,162
Non-current liabilities:
Long-term payables (including long-term payables of the consolidated VIEs without recourse to BIT Mining Limited of RMB2,965 and RMB526 (US$81) as of December 31, 2019 and 2020, respectively)	526	81	2,965
Operating lease liabilities - non-current (including operating lease liabilities - non-current of the consolidated VIEs without recourse to BIT Mining Limited of RMB31,675 and RMB5,807 (US$890) as of December 31, 2019 and 2020, respectively)	5,807	890	31,675
Deferred tax liabilities (including deferred tax liabilities of the consolidated VIEs without recourse to BIT Mining Limited of nil and nil as of December 31, 2019 and 2020, respectively)	0	0	59
Total non-current liabilities	6,333	971	34,699
TOTAL LIABILITIES	79,953	12,255	111,861
Commitments and contingencies
Redeemable non-controlling interest			14,849
Shareholders' equity:
Additional paid-in capital	2,602,883	398,909	2,547,293
Treasury shares	(143,780)	(22,035)	(143,780)
Accumulated other comprehensive income	128,441	19,684	141,484
Accumulated deficit and statutory reserve	(2,183,918)	(334,700)	(1,960,692)
Total BIT Mining Limited shareholders' equity	403,777	61,880	584,456
Non-controlling interest	(13,257)	(2,032)	(15,387)
Total shareholders' equity	390,520	59,848	569,069
TOTAL LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND SHAREHOLDERS' EQUITY	470,473	72,103	695,779
Class A Ordinary shares [Member]
Shareholders' equity:
Ordinary shares, value	¥ 151	$ 22	145
Class B Ordinary shares [Member]
Shareholders' equity:
Ordinary shares, value			¥ 6

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2019CNY (¥)shares
Accrued payroll and welfare payable (including accrued payroll and welfare payable of the consolidated VIEs without recourse to BIT Mining Limited of RMB4,830 and RMB12,288 (US$1,883) as of December 31, 2019 and 2020, respectively)	¥ 13,401	¥ 6,879
Operating lease liabilities - current (including operating lease liabilities - current of the consolidated VIEs without recourse to BIT Mining Limited of RMB13,698 and RMB3,710 (US$569) as of December 31, 2019 and 2020, respectively)	3,710	16,672
Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to BIT Mining Limited of RMB36,087 and RMB36,870 (US$5,651) as of December 31, 2019 and 2020, respectively)	55,960	51,398
Income tax payable (including income tax payable of the consolidated VIEs without recourse to BIT Mining Limited of RMB1,525 and nil as of December 31, 2019 and 2020, respectively)	549	2,213
Long-term payables (including long-term payables of the consolidated VIEs without recourse to BIT Mining Limited of RMB2,965 and RMB526 (US$81) as of December 31, 2019 and 2020, respectively)	526	2,965
Operating lease liabilities - non-current (including operating lease liabilities - non-current of the consolidated VIEs without recourse to BIT Mining Limited of RMB31,675 and RMB5,807 (US$890) as of December 31, 2019 and 2020, respectively)	5,807	31,675
Deferred tax liabilities (including deferred tax liabilities of the consolidated VIEs without recourse to BIT Mining Limited of nil and nil as of December 31, 2019 and 2020, respectively)	¥ 0	¥ 59
Ordinary shares, shares authorized	1,000,000,000	1,000,000,000
VIE [Member]
Accrued payroll and welfare payable (including accrued payroll and welfare payable of the consolidated VIEs without recourse to BIT Mining Limited of RMB4,830 and RMB12,288 (US$1,883) as of December 31, 2019 and 2020, respectively)	¥ 12,288	¥ 4,830
Operating lease liabilities - current (including operating lease liabilities - current of the consolidated VIEs without recourse to BIT Mining Limited of RMB13,698 and RMB3,710 (US$569) as of December 31, 2019 and 2020, respectively)	3,710	13,698
Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to BIT Mining Limited of RMB36,087 and RMB36,870 (US$5,651) as of December 31, 2019 and 2020, respectively)	36,870	36,087
Income tax payable (including income tax payable of the consolidated VIEs without recourse to BIT Mining Limited of RMB1,525 and nil as of December 31, 2019 and 2020, respectively) \| ¥	0	1,525
Long-term payables (including long-term payables of the consolidated VIEs without recourse to BIT Mining Limited of RMB2,965 and RMB526 (US$81) as of December 31, 2019 and 2020, respectively)	526	2,965
Operating lease liabilities - non-current (including operating lease liabilities - non-current of the consolidated VIEs without recourse to BIT Mining Limited of RMB31,675 and RMB5,807 (US$890) as of December 31, 2019 and 2020, respectively)	5,807	31,675
Deferred tax liabilities (including deferred tax liabilities of the consolidated VIEs without recourse to BIT Mining Limited of nil and nil as of December 31, 2019 and 2020, respectively) \| ¥	¥ 0	¥ 0
Class A Ordinary shares [Member]
Ordinary shares, shares authorized	700,000,000	700,000,000
Ordinary shares, shares issued	430,127,692	420,001,792
Ordinary shares, shares outstanding	430,127,692	420,001,792
Class B Ordinary shares [Member]
Ordinary shares, shares authorized	300,000,000	300,000,000
Ordinary shares, shares issued	99	10,000,099
Ordinary shares, shares outstanding	99	10,000,099

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)¥ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)¥ / sharesshares	Dec. 31, 2018CNY (¥)¥ / sharesshares
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net Revenues	¥ 21,815	$ 3,343	¥ 39,688	¥ 126,089
Operating costs and expenses:
Cost of services	(16,774)	(2,571)	(59,410)	(80,017)
Sales and marketing	(16,748)	(2,567)	(42,445)	(92,465)
General and administrative	(152,541)	(23,378)	(223,758)	(251,384)
Service development	(30,201)	(4,629)	(48,614)	(61,909)
Total operating expenses	(216,264)	(33,145)	(374,227)	(485,775)
Other operating income	5,518	846	6,788	12,638
Government grant	891	137	3,504	7,620
Other operating expenses	(2,752)	(422)	(6,995)	(5,060)
Impairment of intangible assets			(181,845)	0
Impairment of goodwill			(129,752)	0
Operating loss from continuing operations	(190,792)	(29,241)	(642,839)	(344,488)
Other (expenses)/income, net	748	115	455	(43)
Interest income	9,093	1,394	13,448	15,308
Loss from equity method investments	(10,798)	(1,655)	(10,639)	(15,025)
Impairment of long-term investments	(33,001)	(5,058)	(22,353)	(149,896)
Gain from disposal of subsidiaries			0	2,805
Loss before income taxes from continuing operations	(224,750)	(34,445)	(661,928)	(491,339)
Income taxes benefits	(3,654)	(560)	(7,642)	(19,602)
Net loss from continuing operations	(221,096)	(33,885)	(654,286)	(471,737)
Income from discontinued operations, net of income taxes			0	2,183
Gain on disposal of discontinued operations, net of income taxes			0	10,160
Net income from discontinued operations, net of income taxes			0	12,343
Net loss	(221,096)	(33,885)	(654,286)	(459,394)
Net (loss) income from continuing operations attributable to non-controlling interest and redeemable non-controlling interest	2,130	326	(3,018)	(8,820)
Net income from discontinued operations attributable to non-controlling interest			0	1,099
Less: Net (loss) income attributable to the non-controlling interest	2,130	326	(3,018)	(4,486)
Less: Net loss attributable to redeemable non-controlling interest			0	(3,235)
Net loss attributable to BIT Mining Limited	(223,226)	(34,211)	(651,268)	(451,673)
Other comprehensive income (loss):
Share of other comprehensive loss of an equity method investee	(1,218)	(187)	(3,986)	0
Foreign currency translation gain (loss)	(11,825)	(1,812)	6,408	23,023
Other comprehensive income (loss), net of tax	(13,043)	(1,999)	2,422	23,023
Comprehensive loss	(234,139)	(35,884)	(651,864)	(436,371)
Less: Comprehensive (loss) income attributable to redeemable non-controlling interest and non-controlling interest	2,130	326	(4,344)	(6,383)
Comprehensive loss attributable to BIT Mining Limited	¥ (236,269)	$ (36,210)	¥ (647,520)	¥ (429,988)
Losses per share for Class A and Class B ordinary shares outstanding-Basic and Diluted:
Net loss from continuing operations \| (per share)	¥ (0.52)	$ (0.08)	¥ (1.52)	¥ (1.13)
Net income from discontinued operations \| ¥ / shares			0	0.03
Net loss \| (per share)	(0.52)	(0.08)	(1.52)	(1.10)
Losses per American Depositary Share ("ADS") (1 ADS represents 10 Class A ordinary shares)-Basic and Diluted
Net loss from continuing operations \| (per share)	(5.19)	(0.80)	(15.20)	(11.28)
Net income from discontinued operations \| ¥ / shares			0	0.27
Net loss \| (per share)	¥ (5.19)	$ (0.80)	¥ (15.20)	¥ (11.01)
Weighted average number of Class A and Class B ordinary shares outstanding:
Basic \| shares	430,011,263	430,011,263	428,586,305	418,911,292
Diluted \| shares	430,011,263	430,011,263	428,586,305	418,911,292

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Cash flow from operating activities
Net loss	¥ (221,096)	$ (33,885)	¥ (654,286)	¥ (459,394)
Adjustments to reconcile net loss to net cash used in operating activities:
Write off of remaining ROU asset and lease liability pursuant to a lease termination	(11,740)	(1,799)	0	0
Amortization of right-of-use assets	7,224	1,107	17,668	0
Depreciation of property and equipment	43,582	6,679	32,017	31,069
Amortization of intangible assets	2,202	337	29,369	32,910
Deferred tax benefit	(3,658)	(561)	(7,642)	(6)
Share-based compensation	55,424	8,494	79,275	108,628
Losses on disposal of property and equipment	1,450	222	0	0
Impairment of intangible assets			181,845	0
Impairment of goodwill			129,752	0
Impairment of long-term investments	33,001	5,058	22,353	149,896
Provision for bad debt	510	78	20,253	0
Loss from equity method investments	10,798	1,655	10,639	15,025
Gain on disposal of subsidiaries			0	(12,965)
Changes in operating assets and liabilities:
Prepayments and other receivables	5,680	870	15,722	18,207
Deposits	3,909	599	(236)	612
Other non-current assets	222	34	1,676	0
Operating lease liabilities	(14,395)	(2,206)	(13,289)	0
Accrued expenses and other current liabilities	12,827	1,966	(21,429)	(1,395)
Accrued payroll and welfare payable	6,522	1,000	(2,900)	(1,800)
Long-term payables	(518)	(79)	(1,258)	(24,690)
Income tax payable			447	(224)
Net cash used in operating activities	(68,056)	(10,431)	(160,024)	(144,127)
Cash flows from investing activities
Acquisition of property and equipment	(1,470)	(225)	(3,757)	(35,623)
Acquisition of intangible assets			0	(1,053)
Disposal of subsidiaries and VIEs, net of cash disposed			0	23,683
Acquisition of redeemable noncontrolling interest	(13,835)	(2,120)	0	0
Acquisition of long-term investments			0	(11,059)
Cash paid for short-term investments	(80,000)	(12,261)	0	0
Cash paid for time deposits			(160,730)	0
Cash received from return of time deposits	22,319	3,421	137,264	0
Cash received from return of short-term investments	80,000	12,261	100,000	0
Cash received from return of long-term investments			6,488	7,593
Proceeds from disposal of property and equipment	155	24	155	0
Proceeds from disposal of other long-term investments	2,419	371	0	5,843
Loans provided to a related party			(10,000)	0
Loans provided to third parties			(7,877)	(10,009)
Repayment of loans provided to a related party	10,000	1,533	0	0
Repayment of loans provided to third parties	2,126	326	5,274	5,021
Net cash (used in) provided by investing activities	21,714	3,330	66,817	(15,604)
Cash flows from financing activities
Proceeds from the exercise of share-based awards	26	4	17,105	41,473
Withdrawal of prepayment for share repurchase			0	13,318
Net cash provided by financing activities	26	4	17,105	54,791
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(6,975)	(1,065)	5,511	21,226
Net decrease in cash, cash equivalents and restricted cash	(53,291)	(8,162)	(70,591)	(83,714)
Cash, cash equivalents and restricted cash at beginning of the year	365,796	56,056	436,387	520,101
Cash, cash equivalents and restricted cash at end of the year	312,505	47,894	365,796	436,387
Supplemental disclosures of cash flow information:
Income tax paid			0	0
Interest received	9,882	1,514	12,733	16,000
Supplemental disclosures of non-cash investing and financing activities:
Remeasurement of the lease liabilities and right-of-use assets due to lease modification	¥ 5,269	$ 808	¥ 0	¥ 0

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY ¥ in Thousands, $ in Thousands	Class A Ordinary shares [Member]shares	Class B Ordinary shares [Member]shares	Ordinary shares [Member]CNY (¥)	Ordinary shares [Member]USD ($)	Additional paid-in capital [Member]CNY (¥)	Additional paid-in capital [Member]USD ($)	Treasury shares [Member]CNY (¥)	Treasury shares [Member]USD ($)	Accumulated other comprehensive income [Member]CNY (¥)	Accumulated other comprehensive income [Member]USD ($)	Accumulated deficit and statutory reserve [Member]CNY (¥)	Accumulated deficit and statutory reserve [Member]USD ($)	Non-controlling interestsCNY (¥)	Non-controlling interestsUSD ($)	CNY (¥)shares	USD ($)shares
Balance at Dec. 31, 2017			¥ 143		¥ 2,295,111		¥ (143,780)		¥ 116,051		¥ (857,751)		¥ 99,536		¥ 1,509,310
Balance, shares at Dec. 31, 2017 \| shares	333,787,552	74,400,299
Disposal of VIE			0		0		0		0		0		(107,419)		(107,419)
Adjustment to redemption value of redeemable non-controlling interest			0		(10,559)		0		0		0		0		(10,559)
Net loss for the year			0		0		0		0		(451,673)		(4,486)		(456,159)
Foreign currency translation gain (loss)			0		0		0		21,685		0		1,326		23,011
Share of other comprehensive loss of an equity method investee															0
Issuance of ordinary shares from exercise of share-based awards			6		38,744		0		0		0		0		¥ 38,750
Issuance of ordinary shares from exercise of share-based awards, shares \| shares	17,016,980														6,513,460	6,513,460
Share-based compensation			0		108,628		0		0		0		0		¥ 108,628
Balance at Dec. 31, 2018			149		2,431,924		(143,780)		137,736		(1,309,424)		(11,043)		1,105,562
Balance, shares at Dec. 31, 2018 \| shares	350,804,532	74,400,299
Adjustment to redemption value of redeemable non-controlling interest			0		14,539		0		0		0		0		14,539
Net loss for the year			0		0		0		0		(651,268)		(3,018)		(654,286)
Foreign currency translation gain (loss)			0		0		0		7,734		0		(1,326)		6,408
Share of other comprehensive loss of an equity method investee			0		0		0		(3,986)		0		0		(3,986)
Conversion of Class B to Class A ordinary shares			0		0		0		0		0		0		0
Conversion of Class B to Class A ordinary shares, shares \| shares	64,400,200	(64,400,200)
Issuance of ordinary shares from exercise of share-based awards			2		21,555		0		0		0		0		¥ 21,557
Issuance of ordinary shares from exercise of share-based awards, shares \| shares	4,797,060														3,572,880	3,572,880
Share-based compensation			0		79,275		0		0		0		0		¥ 79,275
Balance at Dec. 31, 2019			151		2,547,293		(143,780)		141,484		(1,960,692)		(15,387)		569,069
Balance, shares at Dec. 31, 2019 \| shares	420,001,792	10,000,099
Net loss for the year											(223,226)		2,130		(221,096)
Foreign currency translation gain (loss)									(11,825)						(11,825)
Share of other comprehensive loss of an equity method investee									(1,218)						(1,218)	$ (187)
Conversion of Class B to Class A ordinary shares, shares \| shares	10,000,000	(10,000,000)
Issuance of ordinary shares from exercise of share-based awards					166										¥ 166
Issuance of ordinary shares from exercise of share-based awards, shares \| shares	125,900														125,900	125,900
Share-based compensation					55,424										¥ 55,424
Balance at Dec. 31, 2020			¥ 151	$ 22	¥ 2,602,883	$ 398,909	¥ (143,780)	$ (22,035)	¥ 128,441	$ 19,684	¥ (2,183,918)	$ (334,700)	¥ (13,257)	$ (2,032)	¥ 390,520	$ 59,848
Balance, shares at Dec. 31, 2020 \| shares	430,127,692	99

ORGANIZATION

ORGANIZATION	12 Months Ended
ORGANIZATION	Dec. 31, 2020
ORGANIZATION
ORGANIZATION	1. ORGANIZATION BIT Mining Limited (formerly, 500.com Limited, the “Company”) was incorporated under the laws of the Cayman Islands on April 20, 2007 under the original name of “Fine Success Limited”, which was changed to “500wan.com” on May 9, 2011, changed to “500.com Limited” on October 9, 2013. On April 12, 2021, the Company announced that at an extraordinary general meeting held on April 8, 2021, the Company’s shareholders passed a special resolution to change the English name of the Company to “BIT Mining Limited” effective as of April 8, 2021. As of the date of this annual report, the Company’s ADSs, each representing the right to receive ten (10) Class A ordinary shares of the Company, are listed on the NYSE under the ticker symbol “WBAI.” The Company’s ADSs are expected to begin trading under the Company’s new English name “BIT Mining Limited,” and its new ticker symbol “BTCM,” effective at the opening of trading on Tuesday, April 20, 2021. This annual report is being prepared under the Company’s new English name “BIT Mining Limited”. As of December 31, 2020, the Company has subsidiaries incorporated in countries and jurisdictions including the People’s Republic of China (“PRC”), British Virgin Islands, Hong Kong, the United States of America (“USA”), Malta, Cyprus, Curacao and Japan and the Company also effectively controls a number of variable interest entities (“VIEs”), through the Primary Beneficiaries, as defined below. The accompanying consolidated financial statements include the financial statements of the Company, its subsidiaries, VIEs and VIEs’ subsidiaries. 1. ORGANIZATION (continued) The Company does not conduct any substantive operations on its own but instead conducts its business operations through its wholly-owned and majority-owned subsidiaries and their respective VIEs or VIEs’ subsidiaries. As of December 31, 2020, the Company’s major subsidiaries, VIEs and VIEs’ subsidiaries are listed below: Percentage of ownership Date of Place of by the Principal Entity establishment establishment Company activities Subsidiaries Fine Brand Limited (“BVI”) February 9, 2011 British Virgin Islands 100 % Investment Holding 500wan HK Limited (“500wan HK”) March 8, 2011 Hong Kong 100 % Investment Holding 500.com Nihon Co., Ltd. (“500.com JP”) July 27, 2017 Japan 100 % Investment Holding 500.com USA Corporation (“500.com USA”) July 21, 2014 USA 100 % Investment Holding E-Sun Sky Computer (Shenzhen) Co., Ltd. (“E-Sun Sky Computer”) June 18, 2007 PRC 100 % Software Service The Multi Group Ltd (“The Multi Group” or “TMG”) June 26, 2015 Malta 100 % Investment Holding Multi Warehouse Ltd**** December 3, 2014 Malta 93 % Online Gaming Multi Brand Gaming Ltd** October 3, 2014 Malta 93 % Online Gaming Multilotto UK Ltd** September1, 2016 Malta 93 % Online Gaming Lotto Warehouse Ltd** September1, 2016 Malta 93 % Online Gaming Wasp Media Ltd** August 12, 2016 Malta 93 % Online Gaming Round Spot Services Ltd** May 6, 2015 Cyprus 93 % Online Gaming Multi Pay N.V.** August 25, 2011 Curacao 93 % Online Gaming Oddson Europe Ltd**** January10, 2018 Malta 93 % Online Gaming VIEs Shenzhen E-Sun Network Co., Ltd. (“E-Sun Network”) December 7, 1999 PRC — Online Lottery Service Shenzhen Youlanguang Science and Technology Co., Ltd. (“Youlanguang Technology”) December 16, 2008 PRC — Online Lottery Service Shenzhen Guangtiandi Science and Technology Co., Ltd. (“Guangtiandi Technology”) December 16, 2008 PRC — Online Lottery Service Subsidiaries of the VIEs Shenzhen E-Sun Sky Network Technology Co., Ltd. (“E-Sun Sky Network”) * May 22, 2006 PRC — Online Lottery Service Lhasa Yicai Network Technology Co., Ltd. (“Lhasa Yicai”) October 17, 2014 PRC — Online Lottery Service Hainan Jingli Network Technology Co., Ltd. (“Hainan Jingli”) May 3, 2018 PRC — Software Service Shenzhen Yicai Network Technology Co., Ltd. (“Shenzhen Yicai”) * July 21, 2015 PRC — Online Lottery Service Shenzhen Kaisheng Jinfu Enterprise Management Co., Ltd. (“Shenzhen Kaisheng”) ** June 24, 2016 PRC — Online Spot Commodity Trading Services 1. ORGANIZATION (continued) * A subsidiary of E-Sun Network A subsidiary of E-Sun Sky Network * A subsidiary of Youlanguang Technology ** A subsidiary of Guangtiandi Technology **** A subsidiary of the Multi Group The Company, its subsidiaries and VIEs are hereinafter collectively referred to as the “Group”. Most of the entities listed above are either holding companies or companies that have no operations. The entities that have substantive operations include the Multi Group and its subsidiaries and the VIEs or subsidiaries of E-Sun Sky Computer. The Group provides sports information services and online spot commodity trading services in the PRC, and online gaming services in Europe. The Group’s principal geographic markets are in the PRC and northern Europe. Since announcing the entry into the cryptocurrency industry in December 2020, the Company have entered into definitive agreements to (i) purchase cryptocurrency mining machines, (ii) acquire a controlling stake in Loto Interactive Limited (HKEX: 08198), (iii) acquire the entire mining pool business of Bitdeer Technologies Holding Company operated under BTC.com, including the domain name BTC.com and the cryptocurrency wallet of BTC.com, and (iv) to acquire a 7-nanometer Mining Machine Manufacturer, which unfurl a comprehensive approach to cryptocurrency mining. As of February 26, 2021, the Company officially began generating revenue from cryptocurrency mining operations. As of the date of this report, the Company has completed a transformation of its business to become a cryptocurrency mining enterprise. Information on Variable Interest Entities (“VIEs”) PRC laws and regulations prohibit or restrict foreign ownership of Internet businesses. To comply with these foreign ownership restrictions, the Company operates its websites and provides online lottery purchase services (which has been ceased since March 2015) in the PRC through the VIEs. Prior to December 28, 2013, the Company entered into exclusive business cooperation agreements, power of attorney, equity interest pledge agreements, exclusive option agreements, financial support agreements and supplementary agreements to the exclusive option agreements (previously named as exclusive technical consulting and service agreements, power of attorney, equity pledge agreements, equity interest disposal agreements, financial support agreements, business operation agreements and intellectual properties license agreements prior to June 1, 2011) (the “Contractual Arrangements”), with several entities through E-Sun Sky Computer, which obligates E-Sun Sky Computer to absorb a majority of the expected losses from the activities of these entities’ activities, and entitles E-Sun Sky Computer to receive a majority of residual returns from these entities’ activities. As result of these contractual arrangements, these entities are considered as VIEs of the Company. Through these aforementioned agreements, the Company maintains the ability to approve decisions made by the VIEs, and the ability to acquire the equity interests in the VIEs when permitted by the PRC laws via E-Sun Sky Computer. As a result of the Contractual Arrangements and because the Company has been determined to 1) be the most closely associated with the VIEs as it has the power to direct the activities of the VIEs that most significantly impact their economic performance, and 2) has the obligation to absorb losses and/or the right to receive benefits of the VIEs that could potentially be significant to the VIEs, the Company consolidates the VIEs as required by Accounting Standards Codification (“ASC”) 810 (“ASC 810”), “ Consolidation 1. (continued) Information on Variable Interest Entities (“VIEs”) (continued) On December 28, 2013, the Company agreed to provide unlimited financial support to the VIEs for their operations. In addition, pursuant to the power of attorney agreements entered into among the Company, E-Sun Sky Computer and the nominee shareholders of the VIEs, on December 28, 2013, the nominee shareholders of the VIEs assigned the rights to attend the VIEs’ shareholders' meetings and to vote on all of the matters in the VIEs that require shareholders' approval, which was originally entrusted to E-Sun Sky Computer, to the Company. As a result of the assignment of power of attorney from E- Sun Sky Computer to the Company and the provision of unlimited financial support from the Company to the VIEs, the Company has been determined to be most closely associated with the VIEs within the group of related parties and replaced E-Sun Sky Computer as the primary beneficiary of the VIEs on December 28, 2013. On January 10, 2017, as a result of the acquisition of Qufan Internet Technology Inc., the Company also entered into the contractual arrangements with Shenzhen Qufan Network Technology Co., Ltd., through Qufan Information Technology (Shenzhen) Co., Ltd, which obligates Qufan Information Technology (Shenzhen) Co., Ltd to absorb a majority of the expected losses from the activities of Shenzhen Qufan Network Technology Co., and entitles Qufan Information Technology(Shenzhen) Co., Ltd to receive a majority of residual returns from Shenzhen Qufan Network Technology Co., Ltd. The Company has disposed of Qufan Internet Technology Inc., together with its subsidiaries and related VIEs in February 2018. In February 2018, the above contractual arrangements between Qufan Information Technology (Shenzhen) Co., Ltd and Shenzhen Qufan Network Technology Co., Ltd were terminated. 1. ORGANIZATION (continued) Information on Variable Interest Entities (“VIEs”) The carrying amounts of the assets, liabilities, the results of operations and cash flows of all of these VIEs included in the Group’s consolidated balance sheets, statements of comprehensive loss and statements of cash flows are as follows: As of As of As of December December December 31, 2019 31, 2020 31, 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 194,914 194,510 29,810 Restricted cash 1,539 1,242 190 Time Deposit 100 — — Amounts due from intergroup companies 992 936 143 Amounts due from a related party 10,401 368 56 Prepayments and other current assets, net 14,608 12,781 1,960 Total current assets 222,554 209,837 32,159 Non-current assets: Property and equipment, net 44,354 15,181 2,327 Intangible assets, net 1,636 1,229 188 Deposits 5,117 424 65 Long-term investments 34,417 35,192 5,393 Right-of-use assets 33,633 9,327 1,429 Other non-current assets 1,887 1,665 255 Total non-current assets 121,044 63,018 9,657 TOTAL ASSETS 343,598 272,855 41,816 LIABILITIES Current liabilities: Amounts due to intergroup companies 367,368 374,379 57,376 Accrued payroll and welfare payable 4,830 12,288 1,883 Accrued expenses and other current liabilities 36,087 36,870 5,651 Operating lease liabilities - current 13,698 3,710 569 Income tax payable 1,525 — — Total current liabilities 423,508 427,247 65,479 Non-current liabilities: Long-term payables 2,965 526 81 Operating lease liabilities - non-current 31,675 5,807 890 Total non-current liabilities 34,640 6,333 971 TOTAL LIABILITIES 458,148 433,580 66,450 1. (continued) Information on Variable Interest Entities (“VIEs”) For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net revenues for continuing operations 20,578 4,093 6,886 1,055 Net revenues for discontinued operations 7,398 — — — Net loss for continuing operations (103,383) (135,816) (60,464) (9,267) Net income for discontinued operations 2,183 — — — For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net cash used in operating activities (93,142) (80,729) (38,888) (5,960) Net cash provided by (used in) investing activities 11,164 (254) 18,440 2,826 Net cash provided by financing activities 104,453 152,701 19,747 3,026 There was no pledge or collateralization of the VIEs’ assets. Creditors of the VIEs have no recourse to the general credit of the Company, which is the primary beneficiary of the VIEs. In addition, the Company has provided a loan of US$26,987 in financial support to its VIEs, E-Sun Sky Network, as of December 31, 2020. Basis of presentation and use of estimates The accompanying consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”). The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the balance sheet dates and the reported amounts of revenues and expenses during the reporting periods. Significant estimates and assumptions reflected in the Group’s consolidated financial statements include, but are not limited to, revenue recognition, allowance for doubtful accounts, useful lives of property and equipment, impairment of long-lived assets, long-term investments and goodwill, realization of deferred tax assets, uncertain income tax positions and share-based compensation. Actual results could materially differ from those estimates.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of consolidation The consolidated financial statements of the Group include the financial statements of the Company, its subsidiaries and VIEs in which it has a controlling financial interest. The results of the subsidiaries are consolidated from the date on which the Group obtained control and continue to be consolidated until the date that such control ceases. A controlling financial interest is typically determined when a company holds a majority of the voting equity interest in an entity. Furthermore, if the Company demonstrates that it has ability to control the VIEs through its rights to all the residual benefits of the VIEs and its obligation to fund losses of the VIEs then the entity is consolidated. All significant intercompany balances and transactions among the Company, its subsidiaries and VIEs have been eliminated on consolidation. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Reclassification Certain prior year amounts have been reclassified to conform to the current period presentation. These reclassifications had no impact on net earnings and financial position. Convenience translation Translations of amounts from RMB into US$ for the convenience of the reader were calculated at the noon buying rate of US$ 1.00 Foreign currency translation The functional currency of the Company, BVI, 500wan HK, 500.com USA and 500.com JP is the US$. The functional currency of the Multi Group and its subsidiaries is EUR. E-Sun Sky Computer with its VIEs determined their functional currencies to be the RMB, which is their respective local currencies based on the criteria of ASC 830, “ Foreign Currency Matters” Transactions denominated in foreign currencies are re-measured into the functional currency at the exchange rates prevailing on the transaction dates. Exchange gains and losses resulting from foreign currency transactions are included in the consolidated statements of comprehensive loss. Business combinations and non-controlling interests The Group accounts for its business combinations using the purchase method of accounting in accordance with ASC 805 (“ASC 805”), “ Business Combinations” The determination and allocation of fair values to the identifiable assets acquired, liabilities assumed and non-controlling interests is based on various assumptions and valuation methodologies requiring considerable judgment from management. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. The Group determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets, forecasted life cycle and forecasted cash flows over that period. 2. (continued) Business combinations and noncontrolling interests For the Company's majority-owned subsidiaries and VIEs, non-controlling interests are recognized to reflect the portion of their equity which is not attributable, directly or indirectly, to the Group. “Net loss” on the consolidated statements of comprehensive loss include the “net loss attributable to non-controlling interests”. The cumulative results of operations attributable to non-controlling interests are also recorded as non-controlling interests in the Company's consolidated balance sheets. Cash and cash equivalents Cash and cash equivalents represent cash on hand and time deposits, which have original maturities of three months or less when purchased and which are unrestricted as to withdrawal and use. In addition, highly liquid investments which have original maturities of three months or less when purchased are classified as cash equivalents. Restricted cash Restricted cash represents cash held by banks which were granted by the government and designated only for the purchase of fixed assets for certain approved projects and deposits in merchant bank where withdrawals are currently restricted. Time deposits Time deposits represent deposits in commercial banks with original maturities of greater than three months but less than a year. Interest income from time deposits is included in the consolidated statements of comprehensive loss. Allowance for doubtful accounts Receivables are carried at original invoiced amount less an allowance for doubtful accounts when collection of the amount is no longer probable. Prior to January 1, 2020, in evaluating the collectability of receivable balances, the Group considers factors such as customer circumstances or age of the receivable. Receivables are written off after all collection efforts have ceased. Collateral is not typically required, nor is interest charged on receivables. Starting from January 1, 2020, the Group adopted ASU No. 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Property and equipment, net Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, as follows: Category Estimated Useful Life Estimated Residual Electronics and office equipment 3- 5 5 % Motor vehicles 5-10 years 2-5 % Leasehold improvements Shorter of lease term or the estimated useful lives of the assets — Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterment that extend the useful lives of property and equipment are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in the consolidated statements of comprehensive loss. Intangible assets Intangible assets represent computer software, internet domain name, licensing agreement, and intangible assets arising from business combination. Computer software, internet domain name and licensing agreement purchased from third parties are initially recorded at cost and amortized on a straight-line basis over their estimated useful lives of the respective assets. The Group performs valuation of the intangible assets arising from business combination to determine the relative fair value to be assigned to each asset acquired. The acquired intangible assets are recognized and measured at fair value and are expensed or amortized using the straight-line approach over the estimated useful life of the assets. Estimated useful lives of the respective assets are set out as follows: Category Estimated Useful Life Computer software 3-10 years Internet domain name 10 years Licensing agreement Agreement term Intangible assets arising from business combination Licenses and brand name 10 years Mobile applications and software 5 years Goodwill The Group assesses goodwill for impairment in accordance with ASC 350-20 (“ASC 350-20”), “ Intangibles–Goodwill and Other: Goodwill” 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Goodwill Prior to the early adoption of ASU 2017-04, “ Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued Accounting Standards Update No. 2017-04(“ASU 2017-04”), “ Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. As triggered by TMG’s temporary suspension of its operations in Sweden since January 2020, the Group performed qualitative and quantitative assessment in accordance with ASU 2017-04 and recognized a full impairment loss of RMB129,752 for goodwill arising from acquisition of TMG during the year ended December 31, 2019. Impairment of long-lived assets other than goodwill The Group evaluates its long-lived assets or asset group, including property and equipment, intangible assets and right-of-use assets, with finite lives for impairment whenever events or changes in circumstances (such as a significant adverse change to market conditions that will impact the future use of the assets) indicate that the carrying amount of a group of long-lived assets may not be fully recoverable. When these events occur, the Group evaluates the impairment by comparing the carrying amount of the assets to future undiscounted cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flow is less than the carrying amount of the assets, the Group recognizes an impairment loss based on the excess of the carrying amount of the asset group over its fair value. The Group provided an impairment loss of nil, Long-term investments The Group’s longterm investments consist of equity investments without readily determinable fair value and equity method investments. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Long-term investments (continued) For those investments over which the Group does not have significant influence and without readily determinable fair value, the Group records them at cost, less impairment, and plus or minus subsequent adjustments for observable price changes, in accordance with ASC Topic 321 (“ASC 321”), “ Investments Equity Securities Management regularly evaluates the impairment of these investments based on performance and financial position of the investee as well as other evidence of market value. Such evaluation includes, but is not limited to, reviewing the investee’s cash position, recent financing, projected and historical financial performance, cash flow forecasts and financing needs. An impairment loss is recognized in earnings equal to the excess of the investment’s cost over its fair value at the balance sheet date of the reporting period for which the assessment is made. The fair value would then become the new cost basis of investment. Investments in entities in which the Group can exercise significant influence but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC Topic 323 (“ASC 323”), “ Investments-Equity Method and Joint Ventures According to the above testing, impairment losses of RMB149,896, RMB22,353 and RMB33,001 (US$5,058) for the long-term investments were recognized during the years of 2018, 2019 and 2020, respectively. Investments in limited partnerships greater than 5% are considered more than minor and accounted for using the equity method, unless it is readily apparent that the Group has virtually no influence over the partnership’s financial and operating policies. Fair value measurements Financial instruments primarily include cash and cash equivalents, restricted cash, time deposits, prepayments and other receivables, equity security without readily determinable fair values, equity method investments, and accrued expense and other current liabilities. The Group carries the investment under the measurement alternative method and equity method on other-than-temporary basis. The carrying values of other financial instruments, approximate their fair values due to their short-term maturities. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Fair value measurements (continued) The Group's non-financial assets, including intangible assets, goodwill and property and equipment are measured at fair value when an impairment charge is recognized. The Group applies ASC 820 (“ASC 820”), “Fair Value Measurements and Disclosures ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1— Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2— Include other inputs that are directly or indirectly observable in the marketplace. Level 3— Unobservable inputs which are supported by little or no market activity. ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach, and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset. Related party transactions A related party is generally defined as (i) any person holds 10% or more of the Company’s securities and their immediate families (ii) the Company’s management, (iii) someone that directly or indirectly controls, is controlled by or is under common control with the Company, or (iv) anyone who can significantly influence the financial and operating decisions of the Company. A transaction is considered to be a related party transaction when there is a transfer of resources or obligations between related parties. Related parties may be individuals or corporate entities. Transactions involving related parties cannot be presumed to be carried out on an arm’s-length basis, as the requisite conditions of competitive, free market dealings may not exist. Representations about transactions with related parties, if made, shall not imply that the related party transactions were consummated on terms equivalent to those that prevail in arm’s-length transactions unless such representations can be substantiated. It is not, however, practical to determine the fair value of amounts due from/to related parties due to their related party nature. Revenue recognition The Group’s revenues were derived principally from online gaming services, sports information services, and online spot commodity trading services. The Group adopted ASC Topic 606 “ Revenue from Contracts with Customers Revenue is recognized when control of promised goods or services is transferred to the Group's customers in an amount of consideration to which the Group expects to be entitled to in exchange for those goods or services. The Group follows the five steps approach for revenue recognition under Topic 606: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the Group satisfies a performance obligation. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Revenue recognition (continued) The Group set up an implementation schedule and analyzed each of the Group’s revenue streams in accordance with ASC 606 to determine the impact on the Group’s consolidated financial statements. After the analyzation, the Group concluded that there was no substantial impact on the Group’s consolidated financial statements upon the adoption of ASC 606. The primary sources of the Group’s revenues are as follows: Sports information services The Group offers a comprehensive sports information portal via a designated mobile application, which covers (i) real time soccer match information; and (ii) data-driven soccer match predictions generated by proprietary analysis engine. Users can also post free or pay-per-view contents such as proprietary observations and analyses on the sports information portal. The users pay for each information and data subscription at a fixed price, and the Group pays the original information providers a fixed percentage of total purchase amount if the information is produced by third parties. Revenue is recognized when users have access to the pay-per-view contents or on an average amortization basis according to subscription terms. The Group records the revenue on a net basis for information provided by third parties, because the Group is not the primary obligor to provide the information, but acts as an agent in providing such purchase services. For information provided by the Group itself, the Group records the revenue on a gross basis. The Group provides sports information service through the Group’s service offering named “Cai Xun Hao,” which was ceased in March 2019, and "Smart Big Data", which was started in June 2020. Online spot commodity trading services The Group provides online spot commodity trading services through the designated website and mobile application in Shenzhen Kaisheng. The Group provides customers with reliable online spot commodity trading for gold trade and delay products across PC and mobile devices. The Group processes customer orders through a commercial bank, and later formed a joint venture with Shenzhen Gold Exchange on May 11, 2018 to provide online spot commodity trading services. Trading commissions are received from the commercial bank based on the pre-determined commission fee rate and the total amount of the processed orders. The Group recognizes revenue at a point in time when an order has been successfully processed and began to generate an immaterial amount of revenue each year from trading commissions on the online spot commodity trading services since 2017. Online gaming services The Group also provides online lottery betting and online casino platforms through the Group’s designated website after the acquisition of TMG in July 2017. The Group earns difference between betting and winning for online lottery betting services and online casino platforms as revenues that are generated from the registered users. The registered users enter into certain terms and conditions when they first open their accounts with the Group. Lottery and Casino purchase orders are placed by users through the Group’s online platforms view website. Then the Group processes these orders. Prior to processing orders, users prepay all purchase amounts. The Group pays users prizes when there are any winnings attributable to users. The Group records revenues on a net basis by deducting the winning amounts from betting amounts. Revenue comprises the fair value of the consideration received for the provision of internet gaming in the ordinary course of the Group’s activities, which is recognized when the outcome of an event is known. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Contract balances The Group does not have any contract assets. The Group's contract liabilities include advance from customers, which is recorded when consideration is received from a customer prior to providing services to the customer under the terms of a contract. As of December 31, 2019 and 2020, the Group recorded advance from customers balance of RMB5,012 and RMB4,734 (US$726) respectively, which was included in “Accrued expenses and other current liabilities” on the accompanying consolidated balance sheets. RMB4,477, RMB8,283 and RMB5,012 (US$768) of deferred revenue included in the opening balances of advance from customers was recognized during the years ended December 31, 2018, 2019 and 2020, respectively. The amounts were included in net revenues on the accompanying consolidated statements of comprehensive loss. Refer to Note 21 regarding the discussion of the Group's disaggregate revenue data. Cost of services Account handling expenses Account handling expenses, which consist primarily of transaction fees charged by banks and third-party payment processors for cash transfers between the users’ accounts on the online platforms including websites and mobile applications and their accounts with banks or third-party payment processors, were RMB6.8 million, RMB2.9 million and RMB0.7 million (US$0.1 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Server leasing and maintenance expenses Server leasing and maintenance expenses, which consist primarily of leasing expense of servers and other equipment used in providing online services, were RMB6.1 million, RMB4.2 million and RMB3.2 million (US$0.5 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Lottery insurance expenses Lottery insurance expenses, which consist of insurance premiums payable to insurers for covering the first two categories of winnings in online gaming services for betting on the outcome of lotteries after the acquisition of TMG in July 2017, were RMB20.4 million, RMB9.9 million and RMB5.1 million (US$0.8 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Platform fee Platform fees, which consist of fees payable to online gaming software suppliers for providing various online casino games on TMG’s websites after the acquisition of TMG in July 2017, were RMB12.1 million, RMB6.6 million and RMB0.3 million (US$0.05 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Regulatory and compliance fees Regulatory and compliance fees, which consist of fees payable to regulatory bodies such as Gambling Commission, HM Revenue & Customs, Malta Gaming Authority and Certria EOOD after the acquisition of TMG in July 2017, were RMB2.0 million, RMB1.6 million and RMB1.8 million (US$0.3 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Amortization fees Amortization fees, which consist primarily of amortization of intangible assets arising from business combinations, were RMB31.5 million, RMB28.4 million and RMB1.6 million (US$0.2 million) in 2018, 2019 and 2020, respectively. These costs are recorded in consolidated statements of comprehensive loss on a straight-line basis over the useful life of the intangible assets. Cost of services also comprises employee costs, business tax and surcharges and other direct costs incurred in providing services. These costs are expensed as incurred. Sales and marketing expenses Commission to certain internet companies The Group is responsible to pay certain internet companies a predetermined fixed percentage of the total purchase or deposit amount only if 1) public users enter the Group’s website by redirection through these internet companies’ website, and/or 2) public users have successfully purchased any lottery tickets, virtual tokens, or betting, or deposited certain amounts of cash into their accounts in the Group’s website. The Group is responsible for providing respective services when such public users enter the Group’s website to purchase lottery tickets, virtual tokens or betting. Since these internet companies are providing similar services as those services that have been provided by the Group’s internal sales personnel agent, any relevant costs to be paid by the Group is treated as sales and marketing expenses. Advertising expenditure Advertising costs which consist primarily of expenses associated with advertisements the Group placed on TV channels and other media, are expensed as incurred and are included in “sales and marketing expenses” in the consolidated statements of comprehensive loss. Advertising expenses for the years ended December 31, 2018, 2019 and 2020 were approximately RMB2.4 million, RMB0.5 million and nil, respectively. Sponsorship expenses The Group’s sales and marketing expenses also consist of payments under a sponsorship contract. Accounting for sponsorship payments is based upon specific contract provisions. Generally, sponsorship payments are expensed on a straight-line basis over the term of the contract after giving recognition to periodic performance provisions of the contract. Prepayments made under the contract are included in prepayments based on the period to which the prepayments apply. Service development expenses Service development expenses consist primarily of personnel-related expenses incurred for the development of, enhancement to, and maintenance of the Group’s website that either (i) did not meet the capitalization criteria in accordance with ASC 350, “Intangibles - Goodwill and other” 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Leases Prior to 2019, the Group accounted for leases under ASC 840, Leases On January 1, 2019, the Group adopted ASU No. 2016-02, Leases (together with all amendments subsequently issued thereto, “ASC Topic 842”), using the modified retrospective method. The Group elected the transition method which allows entities to initially apply the requirements by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. As a result of electing this transition method, previously reported financial information has not been restated to reflect the application of the new standard to the comparative periods presented. The Group elected the package of practical expedients permitted under the transition guidance within ASC Topic 842, which among others, allows the Group to carry forward certain historical conclusions reached under ASC Topic 840 regarding lease identification, classification, and the accounting treatment of initial direct costs. The Group elected not to record assets and liabilities on its consolidated balance sheet for new or existing lease arrangements with terms of 12 months or less. The Group recognizes lease expenses for such leases on a straight-line basis over the lease term. The initial lease liability is equal to the future fixed minimum lease payments discounted using the Group’s incremental borrowing rate, on a secured basis. The initial measurement of the right-of-use asset is equal to the initial lease liability plus any initial direct costs and prepayments, less any lease incentives. When a lease is terminated, the right-of-use asset and operating lease liability associated with the lease are derecognized and any difference between the carrying amounts of the right-of-use asset and the lease liability is recognized in the consolidated statements of comprehensive loss as a gain or loss. The primary impact of applying ASC Topic 842 is the initial recognition of approximately RMB 61,636 of operating lease liabilities, and approximately RMB 54,275 of corresponding right-of-use assets, on the Group’s consolidated balance sheet as of January 1, 2019, for leases classified as operating leases under ASC Topic 840. There is no cumulative effect to retained earnings or other components of equity recognized as of January 1, 2019. The Group does not have finance lease arrangements as of December 31, 2020. All right-of-use assets are reviewed for impairment. The Group did not record any impairment on the right-of-use lease assets during the years ended December 31, 2019 and 2020. Income taxes The Group follows the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial reporting and tax bases of assets and liabilities using enacted tax rates that will be in effect in the period in which the differences are expected to reverse. The Group records a valuation allowance to offset deferred tax assets if based on the weight of available evidence, it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. The effect on deferred taxes of a change in tax rates is recognized in the consolidated statements of comprehensive loss in the period that includes the enactment date. Interest and penalties arising from underpayment of income taxes are computed in accordance with the applicable tax law and is classified in the consolidated statements of comprehensive loss as income tax expense. The amount of interest expense is computed by applying the applicable statutory rate of interest to difference between the tax position recognized and the amount previously taken or expected to be taken in a tax return. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Income taxes (continued) In accordance with the provisions of ASC 740 (“ASC 740”), “Income taxes” In conjunction with ASC 740, the Group also applied ASC 740-30 (“ASC 740-30”), “ Income Taxes: Other Considerations or Special Areas” Share-based compensation Share options and restricted shares granted to employees and directors Share options and restricted shares granted to employees and directors are accounted for under ASC 718 (“ASC 718”), “ Compensation - Stock compensation” ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in the subsequent period if actual forfeitures differ from initial estimates. Forfeiture rate is estimated based on historical and future expectation of employee turnover rate and is adjusted to reflect future change in circumstances and facts, if any. Share-based compensation expense is recorded net of estimated forfeitures such that expense was recorded only for those share-based awards that are expected to vest. To the extent the Group revises this estimate in the future, the share-based payments could be materially impacted in the period of revision, as well as in following periods. 2 (continued) Share-based compensation (continued) Share options and restricted shares granted to employees and directors (continued) The compensation costs associated with a modification of the terms of the award (“Modification Award”) are recognized if either the original vesting condition or the new vesting condition has been achieved. Such compensation costs cannot be less than the grant-date fair value of the original award. The incremental compensation cost is measured as the excess of the fair value of the Modification Award over the fair value of the original award at the modification date. Therefore, in relation to the Modification Award, the Group recognizes share-based compensation over the vesting periods of the new options, which comprises, (1) the amortization of the incremental portion of share-based compensation over the remaining vesting term, and (2) any unrecognized compensation cost of original award, using either the original term or the new term, whichever is higher for each reporting period. Share options granted to non-employees Prior to January 1, 2019, the Group records share-based compensation expense for awards granted to non-employees in exchange for services at fair value in accordance with the provisions of ASC 505-50, “ Equity-based payment to non-employees” Starting January 1, 2019, the Group adopted ASU 2018-07 which aligns accounting for share-based payments issued to nonemployees to that of employees under the existing guidance of Topic 718. The adoption did not pose any impact to the Group's retained earnings as all options granted to non-employees were fully vested prior to the adoption. The Group, with the assistance of an independent valuation firm, determined the fair values of the share options recognized in the consolidated financial statements. The binomial option pricing model is applied in determining the estimated fair value of the share options granted to employees and non-employees. Earnings (loss) per share The Company computes earnings per Class A and Class B ordinary shares in accordance with ASC 260 (“ASC 260”), “ Earnings Per Share” The liquidation and dividend rights of the holders of the Company’s Class A and Class B ordinary shares are identical, except with respect to voting. As a result, and in accordance with ASC 260, the undistributed earnings for each year are allocated based on the contractual participation rights of the Class A and Class B ordinary shares as if the earnings for the year had been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the conversion of Class B ordinary shares is assumed in the computation of the diluted net loss per share of Class A ordinary shares, the undistributed earnings are equal to net loss for that computation. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Earnings (loss) per share (continued) For the purposes of calculating the Company’s basic and diluted earnings (loss) per Class A and Class B ordinary shares, the ordinary shares relating to the options that were exercised are assumed to have been outstanding from the date of exercise of such options. The Company treated the excess amount of redemption price of the redeemable non-controlling interest over its fair value as being akin to a dividend, which indirectly affected in the calculation of loss available to ordinary shareholders of the Company used in the loss per share calculation. Governmen

CONCENTRATION OF RISKS

CONCENTRATION OF RISKS	12 Months Ended
CONCENTRATION OF RISKS	Dec. 31, 2020
CONCENTRATION OF RISKS
CONCENTRATION OF RISKS	3. CONCENTRATION OF RISKS Concentration of credit risk Assets that potentially subject the Group to significant concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, and time deposits. As of December 31, 2020, substantially all of the Group’s cash and cash equivalents were deposited in financial institutions located in the PRC, Hong Kong and Malta, which management believes are of high credit quality. Certain risks and uncertainties The Group acquired the Multi Group in July 2017, the operations of which are dependent on its continued licensing by the Nordic countries gaming regulatory bodies such as the Curacao e-Gaming license, the remote gambling licenses from Malta, the remote operating licenses from the UK, the remote bookmaker’s license from Ireland and the license from Sweden. The Multi Group ceased its operations in Ireland and the United Kingdom on July 1, 2019 and September 30, 2019, respectively, and temporarily suspended its operations in Sweden since January 2020 as TMG did not complete the renewal of its Swedish online gambling license before it expired at the end of 2019. After submitting all the application materials and maintaining close communication with Sweden's e-Gaming regulatory authority, TMG completed the renewal process and resumed its operations in Sweden in September 2020. The loss of a license could have a material adverse effect on future results of its operations. The Group is dependent on the PRC and European markets for a significant number of its patrons and revenues. If economic conditions in these areas deteriorate or additional gaming licenses are awarded to other competitors, the Group’s results of operations could be adversely affected. The Group is also dependent on the PRC economy in general, and any deterioration in the national economic, energy, credit and capital markets could have a material adverse effect on future results of operations. The Group is dependent upon a stable gaming and admission tax structure in the locations in which it operates. Any change in the tax structure could have a material adverse effect on future results of operations. The Group‘s reporting currency RMB, which is not freely convertible into foreign currencies. On January 1, 1994, the PRC government abolished the dual rate system and introduced a single rate of exchange as quoted daily by the People’s Bank of China (the “PBOC”). However, the unification of the exchange rates does not imply that the RMB may be readily convertible into US$ or other foreign currencies. All foreign exchange transactions continue to take place either through the PBOC or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the PBOC. Approval of foreign currency payments by the PBOC or other institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts. Additionally, the value of the RMB is subject to changes in central government policies and international economic and political developments affecting supply and demand in the PRC foreign exchange trading system market. Current vulnerability due to change of regulations or policies The Group’s operations may be adversely affected by significant political, economic and social uncertainties in the PRC. Although the PRC government has been pursuing economic reform policies for more than 30 years, no assurance can be given that the PRC government will continue to pursue such policies or that such policies may not be significantly altered, especially in the event of a change in leadership, social or political disruption or unforeseen circumstances affecting the PRC’s political, economic and social conditions. There is also no guarantee that the PRC government’s pursuit of economic reforms will be consistent or effective. Due to the uncertain regulations and policies regarding online sales of sports lottery products in PRC, the Group decided to voluntarily and temporarily suspend all of its lottery sales services on April 4, 2015. As of December 31, 2020, the online lottery sales business is still not resumed.

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS	12 Months Ended
DISCONTINUED OPERATIONS	Dec. 31, 2020
DISCONTINUED OPERATIONS
DISCONTINUED OPERATIONS	4. DISCONTINUED OPERATIONS Disposition of Qufan On February 9, 2018, the Company entered into a share disposal agreement with the founding shareholders of Qufan and disposed of its 51% equity interest in Qufan Internet Technology Inc., and Shenzhen Qufan Network Technology Co., Ltd, together with their subsidiaries (together “Qufan”) for a total consideration of US$19,431 (RMB121,964). From February 9, 2018, the Company no longer retained any financial interest over Qufan and accordingly deconsolidated the Qufan’s financial statements from the Group’s consolidated financial statements. The disposal of Qufan represented a strategic shift and has a major effect on the Group’s result of operations. Accordingly, assets, liabilities, revenues, expenses and cash flows related to Qufan have been reclassified in the consolidated financial statements as discontinued operations for the year ended December 31,2018. On February 9, 2018, the Company calculated a gain resulting from such disposition as follows: As of February 9, 2018 RMB Consideration 121,964 Cash and cash equivalents 41,699 Short-term investments 20,000 Prepayments and other receivables 6,428 Property and equipment, net 1,490 Intangible assets, net 45,847 Goodwill 130,613 Long-term investments 2,000 Other non-current assets 14 Accrued payroll and welfare payable (5,104) Accrued expenses and other current liabilities (756) Income tax payable (4,927) Deferred revenue (5,527) Deferred tax liabilities (12,554) Net assets of Qufan 219,223 Equity interest percentage 51 % Less: Net assets of Qufan attributable to the Company 111,804 Gain on disposal of Qufan 10,160 4. DISCONTINUED OPERATIONS (continued) Disposition of Qufan (continued) The condensed cash flows of Qufan were as follows for the year ended December 31, 2018: For the year ended December 31, 2018* RMB Net cash provided by operating activities 839 Effect of foreign exchange on cash (998) The operating results from discontinued operations included in the Group’s consolidated statements of comprehensive loss were as follows for the year ended December 31, 2018: For the years ended December 31, 2018 * RMB Major classes of line items constituting pre-tax profit of discontinued operations Net revenues 7,398 Cost of services (1,885) Sales and marketing (1,938) General and administrative (443) Service development expenses (688) Other income that are not major 77 Income from discontinued operations, before income tax 2,521 Income tax expense (338) Income from discontinued operations, net of income tax 2,183 Gain on deconsolidation of the subsidiary, net of income tax 10,160 Net income from discontinued operations, net of income tax 12,343 * Included financial results of discontinued operations from January 1, 2018 to February 9, 2018.

BUSINESS COMBINATION

BUSINESS COMBINATION	12 Months Ended
BUSINESS COMBINATION	Dec. 31, 2020
BUSINESS COMBINATION
BUSINESS COMBINATION	5. BUSINESS COMBINATION Acquisition of The Multi Group On July 17, 2017 (“the acquisition date”), the Company acquired 93.0% equity interest of the Multi Group (“TMG”) through BIT Mining Limited for a total consideration of approximately EUR49.8 million. The Multi Group engages in operating Multilotto.com (“Multilotto”) which is considered one of the top online lottery betting and online casino platforms in the Nordic countries where it holds substantial market share. As of July 17, 2017, the Group settled payment of EUR49,754 cash consideration for the acquisition. 5. BUSINESS COMBINATION (continued) Acquisition of The Multi Group (continued) In accordance with the acquisition agreement, the Group is obligated to purchase the remaining 7% equity interest of the Multi Group at the option of the non-controlling shareholder, which is outside the control of the Group (upon the occurrence of an event that is not solely within the control of the issuer). As such, the non-controlling interest relating to this portion of put options was presented as redeemable non-controlling interest in mezzanine equity and be initially measured at its fair value in accordance with ASC 480-10-S99-3A. The fair value of redeemable non-controlling interest was initially recorded as the value assessed by the third-party appraiser on the acquisition day. As of the acquisition date, the fair value of the 7% non-controlling interest in the Multi Group is estimated to be EUR2,915. The fair value of the non-controlling interest was estimated using the Income Approach. As the Multi Group was a private company, the fair value measurement is based on significant inputs that are not observable in the market and thus represents a Level 3 measurement as defined in ASC 820. The fair value estimates are based on (a) internal rate of return of 16%; (b) a long-term sustainable growth rate of 2%; (c)adjustment of risk premium of 3%; and (d) financial multiples of companies in the same industry as the Multi Group. The redeemable non-controlling interest was subsequently adjusted by recording ASC 810-10 attribution based on the earnings or losses of the investment allocable to the non-controlling interest. On January 1, 2019, the Company received the repurchase notice from the non-controlling interest shareholder, which requested the Company to repurchase all of the 7% shares at a total amount of EUR3,745. As of December 31, 2018, it is determined that the non-controlling interest will probably become redeemable and the redemption amount will be higher than the carrying amount after ASC 810-10 attribution adjustment. The Company subsequently recognized the changes in the redemption value immediately and adjusted the carrying amount of the redeemable non-controlling interest to equal the redemption amount of EUR3,745 as of December 31, 2018. The excess amount of redemption amount in excess of fair value as of December 31, 2018 was treated as being akin to a dividend (in accordance with footnote 17 of ASC 480-10-S99-3A), which was recorded into Retained earnings (APIC in absence of Retained earnings). For the difference between fair value and the carrying amount after ASC 810-10 attribution adjustment, it is accounted for as equity transactions and classified this portion into APIC based on the guidance in ASC 480-10-S99-3A. The fair value of redeemable non-controlling interest was assessed by the third-party appraiser on December 31, 2018. As of December 31, 2018, the fair value of the 7% non-controlling interest in the Multi Group is estimated to be EUR2,504. The fair value of the non-controlling interest was estimated using the Income Approach. As the Multi Group was a private company, the fair value measurement is based on significant inputs that are not observable in the market and thus represents a Level 3 measurement as defined in ASC 820. The fair value estimates are based on (a) internal rate of return of 17.5%; (b) a long-term sustainable growth rate of 2%; (c)adjustment of risk premium of 5.5%; and (d) financial multiples of companies in the same industry as the Multi Group. On April 10, 2020, the Company reached a settlement agreement to purchase the 7% equity interest in TMG held by Helmet at a final redemption price of EUR1,900 and the final redemption price was fully paid on April 20, 2020. The Group adjusted the carrying amount of the 7% redeemable non-controlling interest to the final redemption amount of EUR1,900 as of December 31, 2019. 5. BUSINESS COMBINATION (continued) Acquisition of The Multi Group (continued) Accordingly, the carrying value of the non-controlling interest as of 2018, 2019 and 2020 is stated as follows: EUR RMB US$ Redeemable noncontrolling interest as of December 31, 2017 2,845 22,052 Total comprehensive loss attributable to non-controlling interest in 2018 (413) (3,223) Adjustment to redemption value in 2018* 1,313 10,559 Redeemable non-controlling interest as of December 31, 2018 3,745 29,388 Adjustment to redemption value in 2019** (1,845) (14,539) — Redeemable non-controlling interest as of December 31, 2019 1,900 14,849 Purchase of 7% redeemable non-controlling interest in 2020 (1,900) (14,849) (2,276) Redeemable non-controlling interest as of December 31, 2020 — — — * Adjustment to redemption value in 2018 including two portions: 1) the excess amount of redemption amount in excess of fair value as of December 31, 2018, 2) the difference between fair value and the carrying amount after ASC 810-10 attribution adjustment. The fair value as of December 31, 2018 was evaluated by third party appraiser on December 31, 2018. The calculation of RMB amount was based on the exchange rate of 1.00 EUR to 7.8473 RMB on December 31, 2018. ** Adjustment to redemption value in 2019 was adjusted according to settlement agreement to purchase the 7% equity interest in TMG held by Helmet at a final redemption price of EUR1,900. The calculation of RMB amount was based on the exchange rate of 1.00 EUR to 7.8155 RMB on December 31, 2019. Goodwill, which is not tax deductible, is primarily attributable to the excess of the consideration and fair value of non-controlling interest over the fair value of the net identifiable assets of the acquiree and is related to synergies expected to be achieved from the acquisition. Acquired intangible assets have weighted average economic lives from the date of purchase as follows: License 10.0 years Brand name 10.0 years Software 5.0 years As of December 31, 2019, the fair value of the equity value including goodwill and the acquired intangible assets of the Multi Group that was assessed by the third-party appraiser are estimated to be nil. The fair value of the equity value including goodwill and the acquired intangible assets were estimated using the Income Approach. As the Multi Group was a private company, the fair value measurement is based on significant inputs that are not observable in the market and thus represents a Level 3 measurement as defined in ASC 820. The fair value estimates are based on (a) internal rate of return of 17.5%; (b) a long-term sustainable growth rate of 2%; (c) adjustment of risk premium of 5.5%; and (d) financial multiples of companies in the same industry as the Multi Group. For the difference between fair value and the carrying amount, the Group recognized an impairment loss of RMB129,752 for goodwill and RMB181,845 for acquired intangible assets for the year ended December 31, 2019. 5. BUSINESS COMBINATION (continued) Acquisition of The Multi Group (continued) Since the acquisition date, the Multi Group contributed revenues of RMB105,511 (EUR13,507), RMB35,596 (EUR 4,612) and RMB14,929 (EUR 1,888) to the Group for the year ended 2018, 2019 and 2020, respectively, and contributed net loss of RMB18,050 (EUR2,311), RMB23,185 (EUR3,004) and RMB8,590 (EUR1,086) to the Group for the years ended 2018, 2019 and 2020, respectively.

INVESTMENTS

INVESTMENTS	12 Months Ended
INVESTMENTS	Dec. 31, 2020
INVESTMENTS
INVESTMENTS	6. INVESTMENTS Long-term Investments As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Carrying amount of equity investments without readily determinable fair value 47,129 44,044 6,750 Carrying amount of equity method investments 105,825 55,928 8,571 Carrying amount of long-term investments 152,954 99,972 15,321 Equity investments - without readily determinable fair value Equity investments - without readily determinable fair value consisted of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Equity investments without readily determinable fair value Private companies 50,603 48,810 7,480 Limited partnerships 22,479 20,342 3,118 Cost of equity investments without readily determinable fair value 73,082 69,152 10,598 Impairment on equity investments without readily determinable fair value (25,953) (25,108) (3,848) Carrying amount of Equity investments without readily determinable fair value 47,129 44,044 6,750 Private companies In March 2015, the Group acquired 10% of the share capital of Hzone Holding Company, a non-listed company, for a cash consideration of US$2,000. In March 2016, the Group transferred 10% of the share capital of Hzone Holding Company, to its VIE Beijing Huizhong Wealth Investment Management Co., Ltd. In August 2015, the Group acquired 1.29% of the share capital of Topgame Global Limited, a non-listed company, for a cash consideration of US$1,373. The Group also acquired 1.29% of the share capital of its VIEs, Caicaihudong (Beijing) Technology Co., Ltd. and Youwang Technology (Shanghai) Co., Ltd., for cash consideration of RMB13 and RMB477, respectively. 6 INVESTMENTS (continued) Private companies (continued) In June 2016, the Group acquired 0.84% of the share capital of Beijing Weisaishidai Sports Technology Co., Ltd, for a cash consideration of RMB10,000. The equity interest was subsequently diluted to 0.83% in 2018 due to increase in shareholder of Beijing Weisaishidai Sports Technology Co., Ltd. In November 2016, the Group acquired 2% of the share capital of Techelix Co., Ltd, a non-listed company, for a cash consideration of US$600. In February 2018, the Group made an additional investment of US$300 in Techelix Co., Ltd. In June 2018, the Group transferred the equity investment of US$50 to a third party. The equity interest was diluted to 1.98% in 2018 and to 1.65% in 2019 due to increase in shareholder of Techelix Co., Ltd. In March 2017, the Group acquired 5% of the share capital of Cheerful Interactive Limited, a non-listed company, for a cash consideration of US$1,250. The equity interest was subsequently diluted to 3.92% in 2018 due to increase in shareholder of Cheerful Interactive Limited. Limited partnerships In June 2014, the Group and Danhua Capital L.P (“Danhua”) entered into a subscription agreement, whereby the Group agreed to purchase limited partnership interest in Danhua’s fund (the “Fund”) in the amount of US$1,000, which entitles the Group an aggregate equity interest of approximately 1.1% in the Fund. As of December 31, 2020, the Group received US$123 in return of principal from Danhua. The Fund’s investment strategy is primarily to invest in emerging companies operating in the USA and PRC. The Fund’s investments are focused in the technology, media and telecommunications sectors. The Fund is scheduled to be in existence until November 15, 2021, unless terminated sooner or extended in accordance with the amended and restated limited partnership agreement. In June 2015, the Group and Beijing Heimatuoxin Venture Capital L.P. (“Heimatuoxin”) entered into a subscription agreement, whereby the Group agreed to purchase 3.49% limited partnership interest in Heimatuoxin for the total amount of RMB3,000. As of December 31, 2020, the Group received RMB679 in dividend and RMB858 in return of principal from Heimatuoxin. Heimatuoxin’s investment strategy is primarily to invest in emerging companies operating in the PRC. Heimatuoxin’s investments are focused in the technology, media and telecommunications sectors. Heimatuoxin is scheduled to be in existence until April 16, 2021, unless terminated sooner or extended in accordance with the amended and restated limited partnership agreement, which was extended for two years to April 16, 2023 in July 2020. In June 2016, the Group and Shanghai Jingyan Corporate Development Centre L.P. (“Jingyan”) entered into a subscription agreement, whereby the Group agreed to purchase 4.64% limited partnership interest in Jingyan for a total amount of RMB6,000. The limited partnership interest was diluted to 4.31% in 2018 because of the joining of additional limited partners. As of December 31, 2020, the Group received RMB874 in dividend and RMB60 in return of principal from Jingyan. Jingyan’s investments are focused in the consulting services of corporate management, business information, exhibition, media and telecommunications sectors. Jingyan is scheduled to be in existence until the fifth anniversary of the Initial Contribution Date, unless terminated sooner or extended in accordance with the amended and restated limited partnership agreement. 6 INVESTMENTS (continued) Limited partnerships (continued) In December 2016, the Group and zPark Capital II,L.P.( “ ” zPark’s investment strategy is primarily to make venture capital investments, principally by investing in and holding equity and equity-oriented securities of privately held early-stage technology companies, with an emphasis on companies with a connection to China, Japan and other Asia markets. The general purposes of zPark are to buy, hold, sell and otherwise invest in Securities, whether readily marketable or not; to exercise all rights, powers, privileges and other incidents of ownership or possession with respect to Securities held or owned by zPark; to enter into, make and perform all contracts and other undertakings. zPark is scheduled to be in existence until the tenth anniversary of the Initial Contribution Date, unless terminated sooner or extended in accordance with the amended and restated limited partnership agreement. All of these equity investments without readily determinable fair value were classified as cost method investments prior to adopting ASC 321. In accordance with ASC 321, the Group elected to use the measurement alternative to measure such investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer, if any. The carrying amount of the Group’s equity investments measured using the measurement alternative was RMB73,082, net of RMB25,953 in accumulated impairment and RMB69,152 (US$10,598), net of RMB25,108 (US$3,848) in accumulated impairment as of December 31, 2019 and 2020, respectively. There was no impairment recognized for the years ended December 31, 2018 and 2020. Impairment charges for the year ended December 31, 2019 consisted of impairments on equity investment in Hzone Holding Company of RMB12,400, impairments on equity investment in Topgame Global Limited of RMB9,463, impairments on equity investment in Caicaihudong (Beijing) Technology Co., Ltd. of RMB13 and impairments on equity investment in Youwang Technology (Shanghai) Co., Ltd of RMB477, totaling to the amount of RMB22,353. Equity method investments Equity method investments consisted of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Equity Method Investments Private company 9,000 9,000 1,379 Listed company 302,843 283,252 43,410 Limited partnership 14,385 12,380 1,897 Cost of equity method investments 326,228 304,632 46,686 Impairment on equity investment (187,412) (206,522) (31,651) Loss from equity method investment (32,991) (42,182) (6,464) Carrying amount of equity method investments 105,825 55,928 8,571 6. INVESTMENTS (continued) Private company I Jinyingzaixian is principally engaged in spot commodity trading services in China. The Group’s proportionate share of Jinyingzaixian’s net income (loss) recognized in the consolidated statements of comprehensive loss were RMB(5,948) and RMB(106) and RMB5,306 (US$813) during the years ended December 31, 2018, 2019 and 2020, respectively. Publicly listed company On June 6, 2017, the Company acquired from Melco LottVentures Holdings Limited an aggregate of 1,278,714,329 shares (the “Sale Shares”) of Loto Interactive Limited (“Loto Interactive”, formerly known as MelcoLot Limited), a company listed on the Hong Kong Stock Exchange (Stock Code: 8198), representing approximately 40.65% of Loto Interactive’s existing issued share capital as of the acquisition date. The total consideration paid for the Sale Shares is approximately HK$322.2 million (US$41.3 million), equivalent to approximately HK$0.252 per Sale Share. The Company’s investment in equity shares of Loto Interactive decreased to 40.48% at the end of 2019 due to exercise of share options granted to directors and employees of Loto Interactive and was further diluted to 33.74% due to private placement of Loto Interactive in October 2020. Loto Interactive currently provides comprehensive services including premises, hardware support, power supply, ancillary supervision and management services to their clients. The Group accounted for the purchase as an equity method investment. The Group’s proportionate share of Loto Interactive’s net loss recognized in the consolidated statements of comprehensive loss were RMB12,233, RMB16,423 and RMB14,502(US$2,223), including nil, RMB3,986 and RMB1,218 (US$187) recognized as other comprehensive loss, during the years ended December 31, 2018, 2019 and 2020, respectively. Limited partnership In April 2015, the Group and Guangda Sports Culture Capital L.P (“Guangda Sports Culture”) entered into a subscription agreement, whereby the Group agreed to purchase 9.9% limited partnership interest in Guangda Sports Culture’s fund for a total amount of RMB20,000. Based on actual funding, the limited partnership interest changed to 12.2% as of December 31, 2017. Guangda Sports Culture’s investment strategy is primarily to invest in emerging companies operating in the PRC. Guangda Sports Culture’s investments are focused in the sports sectors. Guangda Sports Culture is scheduled to be in existence until February 9, 2018, and was extended to February 9, 2020 in 2018, unless terminated sooner or extended in accordance with the amended and restated limited partnership agreement. The Group’s proportionate share of Guangda’s net income (loss) recognized in the consolidated statements of comprehensive loss were RMB2,833, RMB2,225 and RMB(3,246) (US$(497)) during the years ended December 31, 2018, 2019 and 2020, respectively. In February 2017, the Group and Sparkland Venture Capital Growth Fund L.P (“Sparkland”) entered into a subscription agreement, whereby the Group agreed to purchase 6.67% limited partnership interest in Sparkland’s fund for a total amount of US$1,000. Based on actual funding, the limited partnership interest changed to 15.38% as of December 31, 2017. 6 INVESTMENTS (continued) Limited partnership (continued) Sparkland’s investments are focused in the Virtual Reality and Augmented Reality industries. The Group’s proportionate share of Sparkland’s net income (loss) recognized in the consolidated statements of comprehensive loss were RMB323, RMB(321) and RMB426 (US$65) during the years ended December 31, 2018, 2019 and 2020, respectively. All of these above-mentioned investments were classified as equity method investments as the Group does have significant influence over the entities. The net operating losses from these equity method investments recognized for the years ended December 31, 2018, 2019 and 2020 were RMB15,025, RMB10,639 and RMB10,798 (US$1,655), respectively. The Group recognized an impairment of RMB149,896, nil and RMB33,001 (US$5,058) in Loto Interactive for the years ended December 31, 2018, 2019 and 2020, respectively.

PREPAYMENTS AND OTHER RECEIVABL

PREPAYMENTS AND OTHER RECEIVABLES	12 Months Ended
PREPAYMENTS AND OTHER RECEIVABLES	Dec. 31, 2020
PREPAYMENTS AND OTHER RECEIVABLES
PREPAYMENTS AND OTHER RECEIVABLES	7. PREPAYMENTS AND OTHER RECEIVABLES Prepayments and other receivables consist of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Receivables from third party payment service providers 5,172 2,347 360 Interest receivables 1,255 466 71 Deferred sponsorship and advertising expenses 139 175 27 Prepaid insurance 218 236 36 Deferred expense* 2,332 2,513 385 Receivables for disposal of long-term investments 8,901 8,901 1,364 Deductible value-added input tax 11,602 11,648 1,785 Others 9,052 5,595 858 Less: allowance for doubtful accounts (8,391) (8,901) (1,364) Prepayments and other receivables, net 30,280 22,980 3,522 7. PREPAYMENTS AND OTHER RECEIVABLES (continued) The table below provides a reconciliation of the beginning and ending allowance for doubtful accounts balance related to other receivables, for the years ended December 31, 2018, 2019 and 2020: For the Year Ended For the Year Ended For the Year Ended For the Year Ended December 31, December 31, December 31, December 31, 2018 2019 2020 2020 RMB RMB US$ Beginning balance prior to ASC 326 — — 8,391 1,286 Impact of adoption to ASC 326 — — — — Beginning balance — — 8,391 1,286 Provisions — 20,253 510 78 Write-offs — (11,862) — — Ending balance — 8,391 8,901 1,364 * Deferred expense represents cash paid in advance to vendors, such as consultant expense and compliance expense, which would be amortized according to their respective service periods.

PROPERTY AND EQUIPMENT, NET

PROPERTY AND EQUIPMENT, NET	12 Months Ended
PROPERTY AND EQUIPMENT, NET	Dec. 31, 2020
PROPERTY AND EQUIPMENT, NET
PROPERTY AND EQUIPMENT, NET	8. PROPERTY AND EQUIPMENT, NET Property and equipment consist of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Electronics and office equipment 45,816 33,353 5,112 Motor vehicles 11,706 10,737 1,646 Leasehold improvements 119,317 118,722 18,195 Property and equipment, cost 176,839 162,812 24,953 Less: Accumulated depreciation (112,727) (143,033) (21,922) Property and equipment, net 64,112 19,779 3,031 Depreciation expenses from continuing operations for the years ended December 31, 2018, 2019 and 2020 were approximately RMB31,027, RMB32,017 and RMB43,582 (US$6,679), respectively. Depreciation expenses from discontinued operations were approximately RMB42, nil and nil for the years ended December 31, 2018, 2019 and 2020, respectively.

INTANGIBLE ASSETS, NET

INTANGIBLE ASSETS, NET	12 Months Ended
INTANGIBLE ASSETS, NET	Dec. 31, 2020
INTANGIBLE ASSETS, NET
INTANGIBLE ASSETS, NET	9. INTANGIBLE ASSETS, NET Intangible assets consist of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Cost: Computer software 27,887 28,424 4,356 License agreement 151,177 151,177 23,169 Internet domain name 1,512 1,512 232 Brand name 86,049 86,049 13,188 266,625 267,162 40,945 Accumulated amortization: Computer software (20,632) (23,154) (3,549) License agreement (37,767) (37,768) (5,788) Internet domain name (724) (837) (128) Brand name (21,152) (21,160) (3,243) (80,275) (82,919) (12,708) Impairment : Computer software (3,547) (3,547) (543) License agreement (113,409) (113,409) (17,381) Brand name (64,889) (64,889) (9,945) (181,845) (181,845) (27,869) Intangible assets, net 4,505 2,398 368 The impairment of RMB181,845 is related to the acquired intangible assets of the Multi Group that were recognized during the year ended December 31, 2019. Amortization expenses from continuing operations for the years ended December 31, 2018, 2019 and 2020 were approximately RMB31,511,RMB29,369 and RMB2,202 (US$337), respectively. Amortization expenses from discontinued operations were approximately RMB1,399, nil and nil for the years ended December 31, 2018, 2019 and 2020, respectively. Annual estimated amortization expense for each of the five succeeding years is as follows: RMB US$ 2021 1,244 191 2022 388 59 2023 336 51 2024 96 15 2025 85 13 2026 and thereafter 249 39 Total 2,398 368

OPERATING LEASES

OPERATING LEASES	12 Months Ended
OPERATING LEASES	Dec. 31, 2020
OPERATING LEASES
OPERATING LEASES	10. OPERATING LEASES The Group entered into various operating lease agreements for offices space. The remaining lease terms ranges from 0.02 to 2.67 years. The Group’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. The following table presents the operating lease related assets and liabilities recorded on the Group's consolidated balance sheet. As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Right-of-use assets 36,607 9,327 1,429 Operating lease liabilities - current 16,672 3,710 569 Operating lease liabilities – non-current 31,675 5,807 890 Total operating lease liabilities 48,347 9,517 1,459 On January 1, 2019, the Group adopted the provisions of ASC 842 using the modified retrospective method and elected not to apply ASC 842 to arrangements with lease terms of 12 month or less. For the year ended December 31, 2019, the Group had operating lease costs of RMB20,530 (US$2,949) and short-term lease costs of RMB8,627 (US$1,239). For the year ended December 31, 2020, the Group had operating lease costs of RMB7,580 (US$1,161) and recognized a gain of RMB11,740 (US$1,799) on lease termination of operating lease and recorded short-term lease costs of RMB3,142 (US$482). Cash paid for amounts included in the measurement of operating lease liabilities were RMB17,175 and RMB7,386 (US$1,132) for the years ended December 31, 2019 and 2020, respectively. As of December 31, 2020, the weighted average remaining lease term was 2.67 years and the weighted average discount rate was 6.175%. During the year ended December 31, 2018, the Group incurred total operating lease expenses of approximately RMB35,144. The following table summarizes the maturity of operating lease liabilities as of December 31, 2020: Operating leases RMB US$ 2021 3,830 587 2022 3,835 588 2023 2,684 411 Thereafter — — Total 10,349 1,586 Less: imputed interest (832) (127) Present value of lease liabilities 9,517 1,459

ACCRUED EXPENSES AND OTHER CURR

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	12 Months Ended
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	Dec. 31, 2020
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	11. ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Accrued expenses and other current liabilities consist of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Advance from end users* 38,663 38,327 5,874 Business tax and other taxes payable 1,136 1,798 276 Professional fees payable 2,878 6,562 1,006 Promotional events payables 2,172 2,077 318 Decoration payables 336 175 27 Others 6,213 7,021 1,076 51,398 55,960 8,577 * Advance from end users represents payments received by the Group in advance from the end users prior to the services to be provided.

STATUTORY RESERVE AND RESTRICTE

STATUTORY RESERVE AND RESTRICTED NET ASSETS	12 Months Ended
STATUTORY RESERVE AND RESTRICTED NET ASSETS	Dec. 31, 2020
STATUTORY RESERVE AND RESTRICTED NET ASSETS
STATUTORY RESERVE AND RESTRICTED NET ASSETS	12. STATUTORY RESERVE AND RESTRICTED NET ASSETS The Company’s ability to pay dividends is primarily dependent on the Company receiving distributions of funds from its subsidiaries. Relevant PRC statutory laws and regulations permit payments of dividends by the Company's PRC subsidiary only out of its retained earnings, if any, as determined in accordance with PRC accounting standards and regulations. The results of operations reflected in the financial statements prepared in accordance with U.S. GAAP differ from those reflected in the statutory financial statements of the Company’s PRC subsidiary. In accordance with the Regulations on Enterprises with Foreign Investment of China and its Articles of Association, the Company’s PRC subsidiary, E-Sun Sky Computer, being foreign-invested enterprises established in the PRC, is required to provide for certain statutory reserves, namely the general reserve fund, enterprise expansion fund and staff welfare and bonus fund, all of which are appropriated from net profit as reported in its PRC statutory accounts. E-Sun Sky Computer is required to allocate at least 10% of its after-tax profits In accordance with the China Company Laws, the Company’s VIEs are PRC domestic companies (i.e. E-Sun Network, E-Sun Sky Network, Youlanguang Technology, Guangtiandi Technology, Hainan Jingli, Lhasa Yicai, Shenzhen Yicai, and Shenzhen Kaisheng), and they must make appropriations from their after-tax profits as reported in their PRC statutory accounts to non-distributable reserve funds, namely statutory surplus fund, statutory public welfare fund and discretionary surplus fund. The VIEs are required to allocate at least 10% of their after-tax profits to the statutory surplus fund until such fund has reached 50% of their respective registered capital. Appropriation to discretionary surplus is made at the discretion of each individual VIE. The general reserve fund and statutory surplus fund are restricted to set-off against losses, expansion of production and operation and increasing registered capital of the respective company. The staff welfare and bonus fund and statutory public welfare fund are restricted to the capital expenditures for the collective welfare of employees. The reserves are not allowed to be transferred to the Company in terms of cash dividends, loans or advances, nor are they available for distribution except under liquidation. 12. STATUTORY RESERVE AND RESTRICTED NET ASSETS (continued) Under PRC laws and regulations, there are restrictions on the Company’s PRC subsidiary and VIEs with respect to transferring certain of their net assets to the Company either in the form dividends, loans, or advances. Amounts restricted include paid-in capital and statutory reserve funds of the Company’s PRC subsidiary and VIEs, as determined pursuant to PRC generally accepted accounting principles, totaling approximately RMB241,884 (US$37,070) as of December 31, 2020. Therefore, in accordance with Rules 504 and 4.08(e)(3) of Regulation S-X, the condensed parent company only financial statements as of December 31, 2019 and 2020 and for each of the three years in the period ended December 31, 2020 are disclosed in Note 23. Furthermore, cash transfers from the Company’s PRC subsidiary to its subsidiaries outside of China are subject to PRC government control of currency conversion. Shortages in the availability of foreign currency may restrict the ability of the PRC subsidiary and consolidated affiliated entities to remit sufficient foreign currency to pay dividends or other payments to the Company, or otherwise satisfy their foreign currency denominated obligations.

INCOME TAXES

INCOME TAXES	12 Months Ended
INCOME TAXES	Dec. 31, 2020
INCOME TAXES
INCOME TAXES	13. INCOME TAXES Cayman Islands Under the current laws of the Cayman Islands, the Company is not subject to tax on income or capital gains. In addition, upon payments of dividends by the Company to its shareholders, no Cayman Islands withholding tax will be imposed. USA 500.com USA is incorporated in the USA and does not conduct any substantive operations of its own. No provision for USA income tax has been made in the financial statements as 500.com USA had no assessable income for the years ended December 31, 2018, 2019 and 2020. British Virgin Islands Under the current laws of the British Virgin Islands, BVI is not subject to tax on income or capital gains. Curacao Multi Pay N.V. is incorporated in the Curacao, Under the current laws, profits tax in Curacao is generally assessed at the rate of 2% of taxable income. Malta Under the current laws, profits tax in Malta is generally assessed at the rate of 35% of taxable income. When dividend is paid or declared to the holding company, the paying entity is entitled to claim 6/7 of the profit tax paid as refund, which may effectively reduce income tax rate to 5%. Cyprus Round Spot Services Ltd is incorporated in Cyprus and does not conduct any substantive operations of its own. No provision for Cyprus income tax has been made in the financial statements as Round Spot Services Ltd had no assessable income for the years ended December 31, 2018, 2019 and 2020. 13. INCOME TAXES (continued) Hong Kong 500wan HK is incorporated in Hong Kong, under the current laws, profits tax in Hong Kong is generally assessed at the rate of 16.5% of taxable income. As 500wan HK does not conduct any substantive operations of its own, no provision for Hong Kong income tax has been made in the financial statements as 500wan HK had no assessable income for the years ended December 31, 2018, 2019 and 2020. Japan 500.com Nihon Co., Ltd is incorporated in Japan in July 2017 and does not conduct any substantive operations of its own. No provision for Japan income tax has been made in the financial statements as 500.com Nihon Co., Ltd had no assessable income for the years ended December 31, 2018, 2019 and 2020. People’s Republic of China A new enterprise income tax law (the “EIT Law”) in the PRC was enacted and became effective on January 1, 2008. The EIT Law applies a uniform 25% enterprise income tax (“EIT”) rate Lhasa Yicai was established in Tibet in 2014 and qualified as a “Western Area Encouraged Industry”. According to local government policy, qualified entities were granted a preferential tax rate of 15% from January 1, 2011 to December 31, 2020. Therefore, Lhasa Yicai is entitled to a preferential tax rate of 15%in 2018, 2019 and 2020. Loss before income taxes from continuing operations consists of: 2018 2019 2020 2020 RMB RMB RMB US$ Cayman Islands (166,710) (432,971) (121,723) (18,655) USA (4,058) (4,350) (554) (85) Hong Kong (7,740) (8,166) (4,887) (749) Japan (1,592) (2,523) (542) (83) Malta (7,949) (257) (9,712) (1,488) Curacao (12,752) (22,698) 1,105 169 Cyprus (8) (31) (43) (7) PRC (290,530) (190,932) (88,394) (13,547) (491,339) (661,928) (224,750) (34,445) 13. INCOME TAXES (continued) People’s Republic of China (continued) The current and deferred components of the income tax expense appearing in the consolidated statements of comprehensive loss are as follows: 2018 2019 2020 2020 RMB RMB RMB US$ Current tax benefit (expense) 19,258 — (4) (1) Deferred tax benefit 344 7,642 3,658 561 Income tax benefit 19,602 7,642 3,654 560 The reconciliation of tax computed by applying the statutory income tax rate applicable to PRC operations to income tax benefit is as follows: 2018 2019 2020 2020 RMB RMB RMB US$ Loss before income taxes (491,339) (661,928) (224,750) (34,445) Income tax computed at applicable tax rates (25%) (122,835) (165,482) (56,188) (8,611) Effect of different tax rates in different jurisdictions 979 1,120 2,222 341 Non-deductible expenses 81,459 114,276 19,819 3,037 Change in valuation allowance 45,832 59,338 43,261 6,629 Changes in interest and penalties on unrecognized tax position 1,637 — — — Effect of EIT reversal for previous years (20,726) — (3,598) (551) Research and development super-deduction (5,942) (9,237) (9,110) (1,396) Others (6) (7,657) (60) (9) (19,602) (7,642) (3,654) (560) A reconciliation of the beginning and ending amount of unrecognized tax position is as follows: 2019 2020 2020 RMB RMB US$ Balance at beginning of year 2,133 1,920 294 Decrease relating to prior year tax positions — (1,920) (294) Decrease relating to expiration of applicable statute of limitations (213) — — Balance at end of year 1,920 — — The Group recognizes interest accrued related to unrecognized tax position in taxation expenses. During the years ended December 31, 2018, 2019 and 2020, the Group did not recognize interest on these unrecognized tax position and reversed approximately RMB7,420, nil and nil in interest, respectively. The Group did not accrue interest on these uncertain taxes as of December 31, 2018, 2019 and 2020. In general, the PRC tax authorities have up to three to five years to conduct examinations of the Group’s tax filings. As of December 31, 2020, the PRC subsidiaries’ 2016 to 2020 tax returns remain open to examination. 13. INCOME TAXES (continued) People’s Republic of China (continued) The components of deferred taxes are as follows: 2019 2020 2020 RMB RMB US$ Deferred tax assets Advertising costs deductible in future years 63,430 63,391 9,715 Deferred government grants 261 75 11 Loss from equity method investment 1,648 3,271 501 Bad debt provision 7,302 5,577 855 Accrued rental expense 15 63 10 Impairment of long-term investments 4,424 4,350 667 Net operating losses (“NOLs”) 160,271 166,118 25,459 Less: valuation allowance (237,351) (242,845) (37,218) Total deferred tax assets, net — — — Deferred tax liabilities Apps and other licenses arisen from business combination (59) — — Total deferred tax liabilities (59) — — The Group records a valuation allowance on its deferred tax assets that is sufficient to reduce the deferred tax assets to an amount that is more likely than not to be realized. Future reversal of the valuation allowance will be recognized either when the benefit is realized or when it has been determined that it is more likely than not that the benefit in future earnings will be realized. As of December 31, 2020, the Group had NOLs of approximately RMB492,220 (US$75,436) and RMB31,636 (US$4,848) from several of its VIEs and the Multi Group, respectively, which can be carried forward to offset future net profit for income tax purposes. The NOLs from several of its VIEs as of December 31, 2020 will expire in years 2021 to 2025 if not utilized. Substantially all of NOLs from the Multi Group as of December 31, 2020 will expire in years 2029 to 2030 if not utilized. The cumulative amount of the temporary differences in respect of investments in foreign subsidiaries were nil as of December 31, 2019 and 2020. Upon repatriation of the foreign subsidiaries and the VIEs’ earnings, in the form of dividends or otherwise, the Company would be subject to various PRC income taxes including withholding income tax. The related unrecognized deferred tax liabilities were nil as of December 31, 2019 and 2020.

EMPLOYEE DEFINED CONTRIBUTION P

EMPLOYEE DEFINED CONTRIBUTION PLAN	12 Months Ended
EMPLOYEE DEFINED CONTRIBUTION PLAN	Dec. 31, 2020
EMPLOYEE DEFINED CONTRIBUTION PLAN
EMPLOYEE DEFINED CONTRIBUTION PLAN	14. EMPLOYEE DEFINED CONTRIBUTION PLAN Full time employees of the Group in PRC participate in a government mandated defined contribution plan, pursuant to which certain pension benefits, medical care, employee housing fund and other welfare benefits are provided to employees. Chinese labor regulations require that the PRC subsidiary and VIEs of the Group make contributions to the government for these benefits based on certain percentages of the employees’ salaries. The Group has no legal obligation for the benefits beyond the contributions made. Such employee benefits, which were expensed as incurred, amounted to approximately RMB12,682, RMB11,770 and RMB4,197 (US$643) for the years ended December 31, 2018, 2019 and 2020, respectively.

SHARE-BASED PAYMENT

SHARE-BASED PAYMENT	12 Months Ended
SHARE-BASED PAYMENT	Dec. 31, 2020
SHARE-BASED PAYMENT
SHARE-BASED PAYMENT	15. SHARE-BASED PAYMENT On March 28, 2011, the shareholders and board of directors of the Company approved the 2011 Share Incentive Plan (the “Plan”). The Plan provides for the grant of options, restricted shares and other share-based awards. These options were granted with exercise prices denominated in US$, which is the functional currency of the Company. The board of directors has authorized under the Plan the issuance of up to 12% of the Company’s issued and outstanding ordinary shares from time to time, on an as-exercised and fully diluted basis, upon exercise of awards granted under the Plan. The maximum term of any issued share option is ten years from the grant date. On June 28, 2018, the Company granted 5,000,000 RSUs to employees. For these rewards, 2,000,000 options were vested on September 1, 2018, and 3,000,000 options were vested on March 1, 2019. On January 2, 2019, the Company granted 7,553,980 RSUs to employees, which were vested on January 1, 2020. On June 26, 2020, the Company granted 12,977,740 RSUs to employees. For these rewards, 6,488,870 options were vested on July 1, 2020, and 6,488,870 options were vested on December 1, 2020. On December 21, 2020, the Company granted and vested 4,500,000 RSUs to employees. A summary of share option and restricted shares activity and related information for the years ended December 31, 2018, 2019 and 2020 are as follows: 15. SHARE-BASED PAYMENT (continued) Share options granted to employees and directors Weighted Weighted Weighted average average average grant date remaining Aggregated Number of exercise fair value per contractual intrinsic options price share year value US$ US$ (Years) US$’000 Outstanding, January 1, 2018 41,987,560 1.04 1.18 1.59 3,986 Granted — — — — — Forfeited — — — — — Exercised (6,513,460) 0.92 1.28 — — Outstanding, December 31, 2018 35,474,100 1.07 1.17 0.94 2,078 Granted — — — — — Forfeited (5,900,000) 1.74 0.92 — — Exercised (3,572,880) 0.69 0.97 — 921 Outstanding, December 31, 2019 26,001,220 0.96 1.25 0.71 1,590 Granted — — — — — Forfeited (18,616,300) 3.01 1.32 — Exercised (125,900) 0.20 0.38 — 88 Outstanding, December 31, 2020 7,259,020 0.99 1.09 0.51 907 Vested and expected to vest at December 31, 2020 7,259,020 0.99 1.08 0.52 907 Exercisable at December 31, 2020 7,259,020 0.99 1.08 0.52 907 15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors Weighted Weighted average average grant date remaining Aggregated Number of fair value per contractual intrinsic options share year value US$ (Years) US$’000 Outstanding, January 1, 2018 12,580,280 0.96 9.63 12,719 Granted 5,000,000 1.41 9.49 3,790 Forfeited — — — — Exercised (10,503,520) 1.05 — 7,962 Outstanding, December 31, 2018 7,076,760 1.15 8.99 5,364 Granted 7,553,980 0.76 9.01 6,496 Forfeited — — — — Exercised (1,224,180) 1.41 — 1,053 Outstanding, December 31, 2019 13,406,560 0.93 8.52 11,530 Granted 17,477,740 0.36 9.61 15,730 Forfeited — — — — Exercised — — — — Outstanding, December 31, 2020 30,884,300 0.62 8.98 27,796 Vested and expected to vest at December 31, 2020 30,884,300 0.62 8.98 27,796 Exercisable at December 31, 2020 30,884,300 0.62 8.98 27,796 The aggregate intrinsic value in the table above represents the difference between the fair value of Company’s common share as of December 31, 2019 and 2020 and the exercise price. Total intrinsic value of options granted to employees and directors exercised for the years ended December 31, 2018, 2019 and 2020 were RMB2,284, RMB6,415 and RMB575 (US$88), respectively. Total intrinsic value of restricted shares granted to employees and directors exercised for the years ended December 31, 2018, 2019 and 2020 was RMB54740, RMB7,331 and nil, respectively. On May 1, 2018, the Company extended the maturity date of the remaining unexercised share options granted on June 19, 2014 from November 22, 2018 to November 22, 2019. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$32, which was measured as the one extending year of the fair value of the modified award of 233,350 shares. On May 1, 2018, the Company extended the maturity date of the remaining unexercised share options granted on June 29, 2015 from June 29, 2018 to June 29, 2019. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$6, which was measured as the one extending year of the fair value of the modified award of 66,600 shares. On May 1, 2018, the Company extended the maturity date of the remaining unexercised share options granted on January 6, 2016 from November 22, 2018 to November 22, 2019. The modification was intended to provide additional incentives for the directors. 15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors (continued) In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$18, which was measured as the one extending year of the fair value of the modified award of 600,000 shares. On June 19, 2018, the Company extended the maturity date of the remaining unexercised share options granted on June 19, 2014 from June 19, 2018 to June 19, 2019. The modification was intended to provide additional incentives for these employees. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$4,764, which was measured as the one extending year of the fair value of the modified award of 7,594,240 shares. On June 19, 2019, the Company extended the maturity date of the remaining unexercised share options granted on June 19, 2014 from June 19, 2019 to June 19, 2020. The modification was intended to provide additional incentives for these employees. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$2,710, which was measured as the one extending year of the fair value of the modified award of 12,301,430 shares. On June 29, 2019, the Company extended the maturity date of the remaining unexercised share options granted on June 29, 2015 from June 29, 2019 to June 29, 2020. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$7, which was measured as the one extending year of the fair value of the modified award of 133,200 shares. On November 22, 2019, the Company extended the maturity date of the remaining unexercised share options granted on June 19, 2014 from November 22, 2019 to November 22, 2020. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$59, which was measured as the one extending year of the fair value of the modified award of 233,350 shares. On November 22, 2019, the Company extended the maturity date of the remaining unexercised share options granted on January 6, 2016 from November 22, 2019 to November 22, 2020. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$50, which was measured as the one extending year of the fair value of the modified award of 600,000 shares. On November 22, 2019, the Company extended the maturity date of the remaining unexercised share options granted on December 16, 2016 from November 22, 2019 to November 22, 2020. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$94, which was measured as the one extending year of the fair value of the modified award of 600,000 shares. On June 19, 2020, the Company extended the maturity date of the remaining unexercised share options granted on June 19, 2014 from June 19, 2020 to June 19, 2021. The modification was intended to provide additional incentives for these employees. 15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors (continued) In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$291, which was measured as the one extending year of the fair value of the modified award of 6,214,920 shares. On December 31, 2020, 3,773,050 shares were given up, which resulted in a reduction of incremental compensation cost of US$83 from US$291 to US$208. On June 29, 2020, the Company extended the maturity date of the remaining unexercised share options granted on June 29, 2015 from June 29, 2020 to June 29, 2021. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$1, which was measured as the one extending year of the fair value of the modified award of 200,000 shares. On November 22, 2020, the Company extended the maturity date of the remaining unexercised share options granted on June 19, 2014 from November 22, 2020 to November 22, 2021. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$5, which was measured as the one extending year of the fair value of the modified award of 233,350 shares. On November 22, 2020, the Company extended the maturity date of the remaining unexercised share options granted on January 6, 2016 from November 22, 2020 to November 22, 2021. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$3, which was measured as the one extending year of the fair value of the modified award of 500,000 shares. On November 22, 2020, the Company extended the maturity date of the remaining unexercised share options granted on December 16, 2016 from November 22, 2020 to November 22, 2021. The modification was intended to provide additional incentives for the directors. In accordance with ASC 718, the effects of a modification resulted in incremental compensation cost of US$7, which was measured as the one extending year of the fair value of the modified award of 600,000 shares. As of December 31, 2020, there was RMB441 (US$68) of unrecognized share-based compensation costs related to equity awards granted to employees and directors that is expected to be recognized over a weighted-average vesting period of 0.58 years. To the extent the actual forfeiture rate is different from the original estimate, actual share-based compensation costs related to these awards may be different from the expectation. As of December 31, 2020, there was no unrecognized restricted share compensation costs related to equity awards granted to employees that is expected to be recognized. To the extent the actual forfeiture rate is different from the original estimate, actual restricted share compensation costs related to these awards may be different from the expectation. As the share options granted to the consultants were fully vested at the grant date, the related compensation expenses were fully recognized in the consolidated statement of comprehensive loss at the grant date. 15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors (continued) The fair value of share options was determined using the binomial option valuation model, with the assistance from an independent third-party appraiser. The binomial model requires the input of highly subjective assumptions, including the expected share price volatility and the suboptimal early exercise factor. For expected volatilities, the Company has made reference to historical volatilities of several comparable companies. The sub-optimal early exercise factor was estimated based on the vesting and contractual terms of the awards and management’s expectation of exercise behavior of the grantees. The risk-free rate for periods within the contractual life of the options is based on market yield of U.S. Treasury Bond in effect at the time of grant. The assumptions used to estimate the fair value of the share options granted are as follows: For the years ended December 31, 2018 2019 2020 Expected volatility 54.27%~60.15 % 66.89%~67.67 % 85.73%~97.73 % Risk-free interest rate 2.26%~2.62 % 1.62%~1.95 % 0.11%~0.17 % Dividend yield 0.00 % 0.00 % 0.00 % Forfeiture rate 0.00 % 0.00 % 0.00 % Suboptimal early exercise factor 2.2~2.8 2.2~2.8 2.2~2.8 The fair value of restricted shares was determined using the market price of the ordinary shares of the Company on the grant date. The exercise price of share options granted to the employees and directors equaled the market price of the ordinary shares on the grant date. No share options were granted during the years ended December 31, 2018, 2019 and 2020. The total fair value of the restricted shares granted to the employees and directors during the years ended December 31, 2018, 2019 and 2020 were RMB48,575, RMB40,023 and RMB41,225 (US$6,318), respectively. The Company granted restricted shares to employees and directors during the years ended December 31, 2018, 2019 and 2020 with free exercise price. The weighted-average grant-date fair value per restricted shares granted to employees and directors during the years ended December 31, 2018, 2019 and 2020 were US$1.41, US$0.76 and US$0.62, respectively. Total share-based compensation expenses relating to options and restricted shares granted to employees and directors for the years ended December 31, 2018, 2019 and 2020 are included in: For the year ended December 31, 2018 Employees Directors Total Total RMB RMB RMB US$ Cost of services 351 — 351 51 Sales and marketing 11,361 — 11,361 1,652 General and administrative 74,227 2,346 76,573 11,137 Service development expenses 20,343 — 20,343 2,959 106,282 2,346 108,628 15,799 15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors (continued) For the year ended December 31, 2019 Employees Directors Total Total RMB RMB RMB US$ Cost of services 14 — 14 2 Sales and marketing 7,410 — 7,410 1,064 General and administrative 57,666 506 58,172 8,356 Service development expenses 13,679 — 13,679 1,965 78,769 506 79,275 11,387 For the year ended December 31, 2020 Employees Directors Total Total RMB RMB RMB US$ Sales and marketing 4,779 — 4,779 732 General and administrative 31,462 9,331 40,793 6,252 Service development expenses 9,852 — 9,852 1,510 46,093 9,331 55,424 8,494

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
RELATED PARTY TRANSACTIONS	Dec. 31, 2020
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS	16. RELATED PARTY TRANSACTIONS Amounts due from a Related Party As of December 31, 2019 and 2020, amounts due from a related party consisted of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Loto Interactive Information Technology (Shenzhen) Limited* 10,401 368 56 10,401 368 56 * Loto Interactive Information Technology (Shenzhen) Limited ("Loto Interactive Shenzhen") is a subsidiary of Loto Interactive, one of the Company’s equity method investment company. The balance as of December 31, 2020 consisted interest receivable with interest rate of 4.35% for a loan provided to Loto Interactive Shenzhen provided by E-Sun Sky Network. On April 24, 2020, Loto Interactive Shenzhen has fully repaid the loan. 16. RELATED PARTY TRANSACTIONS (continued) Related Party transactions For the year For the year For the year For the year ended ended ended ended December 31, December 31, December 31, December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Interest from loan to Loto Interactive Information Technology (Shenzhen) Limited — 218 137 21 Other operating income from management service provided to Loto Interactive Information Technology (Shenzhen) Limited — 320 217 33 — 538 354 54 During the year ended December 31, 2020, the Company also paid expense on behalf of Loto Interactive in the amount of RMB111 (US$17). As of December 31, 2020, Loto Interactive has repaid the full amount to the Company.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
COMMITMENTS AND CONTINGENCIES	Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	17. COMMITMENTS AND CONTINGENCIES Uncertain income tax position As of December 31, 2019 and 2020, the Group has recognized approximately RMB1,920 and nil, respectively, as an accrual for unrecognized tax position, including related interest and penalties. The final outcome of the tax uncertainty is dependent upon various matters including tax examinations, interpretation of tax laws or expiration of statute of limitation. However, due to the uncertainties associated with the status of examinations, including the protocols of finalizing audits by the relevant tax authorities, there is a high degree of uncertainty regarding the future cash outflows associated with these tax uncertainties. As of December 31, 2019, and 2020, the Group classified the accrual of RMB1,920 and nil, respectively, as a long-term payable. Variable interest entity structure In the opinion of management, (i) the ownership structure of the Company and its VIEs are in compliance with existing PRC laws and regulations; (ii) the contractual arrangements with the VIEs and their shareholders are valid and binding, and will not result in any violation of PRC laws or regulations currently in effect; and (iii) the Group’s business operations are in compliance with existing PRC laws and regulations in all material respects. However, there are substantial uncertainties regarding the interpretation and application of current and future PRC laws and regulations. Accordingly, the Company cannot be assured that PRC regulatory authorities will not ultimately take a contrary view to its opinion. If the current ownership structure of the Group and its contractual arrangements with VIEs are found to be in violation of any existing or future PRC laws and regulations, the Group may be required to restructure its ownership structure and operations in the PRC to comply with the changing and new PRC laws and regulations. In the opinion of management, the likelihood of loss in respect of the Group’s current ownership structure or the contractual arrangements with VIEs is remote based on current facts and circumstances. 17. COMMITMENTS AND CONTINGENCIES (continued) Contractual arrangements among the Company and the VIEs Under applicable PRC tax laws and regulations, arrangements and transactions among related parties may be subject to audit or scrutiny by the PRC tax authorities within ten years after the taxable year when the arrangements or transactions are conducted. The Company could face material and adverse tax consequences if the PRC tax authorities were to determine that the Contractual Arrangements among the Company and the respective VIEs were not entered into on an arm’s-length basis and therefore constituted unfavorable transfer pricing arrangements. Unfavorable transfer pricing arrangements could, among other things, result in an upward adjustment on taxation. In addition, the PRC tax authorities may impose interest on late payments on the Company and the respective VIEs for the adjusted but unpaid taxes. In the opinion of management, the likelihood of such an upward adjustment on taxation and related interest is remote based on current facts and circumstances. Guarantees The Group accounts for guarantees in accordance with ASC topic 460 (“ASC 460”), “ Guarantees” The memorandum and articles of association of the Company require that the Company indemnify its officers and directors, as well as those who act as directors and officers of other entities at the Company’s request, against expenses, judgments, fines, settlements and other amounts actually and reasonably incurred in connection with any proceedings arising out of their services to the Company. The indemnification obligations are more fully described in the memorandum and articles of association. The Company purchases standard directors and officers’ insurance to cover claims or a portion of the claims made against its directors and officers. Since a maximum obligation is not explicitly stated in the Company’s memorandum and articles of association and will depend on the facts and circumstances that arise out of any future claims, the overall maximum amount of the obligations cannot be reasonably estimated. Historically, the Group has not been required to make payments related to these obligations, and the fair value for these obligations is zero as of December 31, 2019 and 2020. Indemnity cost There was no indemnity cost occurred in 2018, 2019 and 2020. 17. COMMITMENTS AND CONTINGENCIES (continued) Legal proceedings From time to time, the Group is subject to legal proceedings and claims in the ordinary course of business. The Group records a liability when it is both probable that a liability will be incurred and the amount of the loss can be reasonably estimated. The Group reviews the need for any such liability on a regular basis and has not recorded any material liabilities in this regard during 2018, 2019 and 2020. On February 13, 2020, a securities class action lawsuit was filed against BIT Mining Limited and certain of the Group’s current and former officers (collectively, “Defendants”) in the United States District Court for the Eastern District of New York. The complaint alleges, among other things, that the Group made materially misleading statements and omissions regarding its compliance with applicable anti-corruption laws and regulations. In June 2020, the lead plaintiff filed an amended complaint. In November 2020, the lead plaintiff filed a second amended complaint. The claims raised in the first amended complaint do not differ materially from those raised in the original complaint. The second amended complaint raises the same claims as the first amended complaint, but alleges additional facts in support of those claims. On December 21, 2020, the Company served its Motion to Dismiss the second amendment complaint (“Motion to Dismiss”). On January 20, 2021, lead plaintiff served its opposition to the Company’s Motion to Dismiss. On February 19, 2021, the Company filed all papers associated with its Motion to Dismiss, including the Company’s reply in further support of the Motion to Dismiss. The Group believe it has meritorious defenses to each of the claims in this lawsuit and is prepared to vigorously defend against its allegations. There can be no assurance, however, that the Group will be successful. As of the date of this annual report, the Motion to Dismiss remains pending; at present, the Group cannot reasonably assess the likelihood of any unfavorable outcome, nor can it reasonably estimates the amount, or range, of potential losses, if any, related to the lawsuit. Accordingly, the Group has not recorded any liabilities in respect of this lawsuit as of December 31, 2020. On January 15, 2020, a securities class action lawsuit, making allegations virtually identical with the abovementioned lawsuit filed on February 13, 2020, was filed in the United States District Court for the District of New Jersey. On March 23, 2020, the plaintiff noticed his voluntary dismissal of this case, and on April 8, 2020, the clerk of the Court was ordered to close the case file. As such, this case is now terminated. Operating lease commitments The information of lease commitments is provided in Note 10.

LOSSES PER SHARE

LOSSES PER SHARE	12 Months Ended
LOSSES PER SHARE	Dec. 31, 2020
LOSSES PER SHARE
LOSSES PER SHARE	18. LOSSES PER SHARE Basic and diluted losses per share for each of the years presented is calculated as follows: For the years ended December 31, 2018 2019 2020 RMB RMB RMB RMB RMB US$ RMB US$ Class A Class B Class A Class B Class A Class A Class B Class B Losses per share from continuing operations—basic: Numerator: Allocation of net loss from continuing operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating income per ordinary share—basic (380,701) (82,216) (600,774) (50,494) (222,786) (34,144) (440) (67) Denominator: Weighted average number of ordinary shares outstanding used in calculating basic losses per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Denominator used for losses per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Losses per share from continuing operations — basic (1.13) (1.13) (1.52) (1.52) (0.52) (0.08) (0.52) (0.08) Losses per share from continuing operations—diluted: Numerator: Allocation of net loss from continuing operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating loss per ordinary share— diluted (380,701) (82,216) (600,774) (50,494) (222,786) (34,144) (440) (67) Reallocation of net loss from continuing operations attributable to BIT Mining Limited’s ordinary shareholders as a result of conversion of Class B to Class A shares (82,216) — (50,494) — (440) (67) — — Net loss from continuing operations attributable to ordinary shareholders (462,917) (82,216) (651,268) (50,494) (223,226) (34,211) (440) (67) Denominator: Weighted average number of ordinary shares outstanding used in calculating basic losses per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Conversion of Class B to Class A ordinary shares 74,400,299 — 33,229,132 — 847,093 847,093 — — Denominator used for losses per share 418,911,292 74,400,299 428,586,305 33,229,132 430,011,263 430,011,263 847,093 847,093 Losses per share from continuing operations—diluted (1.13) (1.13) (1.52) (1.52) (0.52) (0.08) (0.52) (0.08) Losses from continuing operations per ADS: Denominator used for losses per ADS - basic 34,451,099 — 39,535,717 — 42,916,417 42,916,417 — — Denominator used for losses per ADS - diluted 41,891,129 — 42,858,631 — 43,001,126 43,001,126 — — Losses from continuing operations per ADS – basic (11.28) — (15.20) — (5.19) (0.80) — — Losses from continuing operations per ADS – diluted (11.28) — (15.20) — (5.19) (0.80) — — 18. LOSSES PER SHARE (continued) For the years ended December 31, 2018 2019 2020 RMB RMB RMB RMB RMB US$ RMB US$ Class A Class B Class A Class B Class A Class A Class B Class B Income per share from discontinued operations—basic: Numerator: Allocation of net income from discontinued operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating income per ordinary share—basic 9,247 1,997 — — — — — — Denominator: Weighted average number of ordinary shares outstanding used in calculating basic income per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Denominator used for income per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Income per share from discontinued operations — basic 0.03 0.03 — — — — — — Income per share from discontinued operations—diluted: Numerator: Allocation of net income from discontinued operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating income per ordinary share— diluted 9,247 1,997 — — — — — — Reallocation of net income from discontinued operations attributable to BIT Mining Limited’s ordinary shareholders as a result of conversion of Class B to Class A shares 1,997 — — — — — — — Net income from discontinued operations attributable to ordinary shareholders 11,244 1,997 — — — — — — Denominator: Weighted average number of ordinary shares outstanding used in calculating basic income per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Conversion of Class B to Class A ordinary shares 74,400,299 — 33,229,132 — 847,093 847,093 — — Denominator used for income per share 418,911,292 74,400,299 428,586,305 33,229,132 430,011,263 430,011,263 847,093 847,093 Losses per share from discontinued operations—diluted 0.03 0.03 — — — — — — Income from discontinued operations per ADS: Denominator used for income per ADS - basic 34,451,099 — 39,535,717 — 42,916,417 42,916,417 — — Denominator used for income per ADS - diluted 41,891,129 — 42,858,631 — 43,001,126 43,001,126 — — Income from discontinued operations per ADS – basic 0.27 — — — — — — — Income from discontinued operations per ADS – diluted 0.27 — — — — — — —

EQUITY TRANSACTIONS

EQUITY TRANSACTIONS	12 Months Ended
EQUITY TRANSACTIONS	Dec. 31, 2020
EQUITY TRANSACTIONS
EQUITY TRANSACTIONS	19. EQUITY TRANSACTIONS The authorized share capital consisted of 1,000,000,000 ordinary shares at a par value of US$0.00005 per share, of which 700,000,000 shares were designated as Class A ordinary shares, and 300,000,000 as Class B 19. EQUITY TRANSACTIONS (continued) In 2018, 6,513,460 share options were exercised at the exercise prices of US$0.2 to US$1.0 per share, resulting in the issuance of 6,513,460 Class A ordinary shares at US$0.00005 each for an aggregate consideration of US$6,014. And 10,503,520 restricted shares were vested and exercised without exercise prices. As of December 31, 2018, 350,804,532 and 74,400,299 Class A and Class B ordinary shares were issued outstanding In 2019, 3,572,880 share options were exercised at the exercise prices of US$0.2 to US$1.0 per share, resulting in the issuance of 3,572,880 Class A ordinary shares at US$0.00005 each for an aggregate consideration of US$2,456, and 1,224,180 restricted shares were vested and exercised without exercise prices. During the year 2019, 64,400,200 Class B ordinary shares were converted to Class A ordinary shares. As of December 31, 2019, 420,001,792 and 10,000,099 Class A and Class B ordinary shares were issued outstanding In 2020, 125,900 share options were exercised at the exercise prices of US$0.2 per share, resulting in the issuance of 125,900 Class A ordinary shares at US$0.00005 each for an aggregate consideration of US$27. During the year of 2020, 10,000,000 Class B ordinary shares were converted to Class A ordinary shares. As of December 31, 2020, 430,127,692 and 99 Class A and Class B ordinary shares were issued outstanding

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT	12 Months Ended
FAIR VALUE MEASUREMENT	Dec. 31, 2020
FAIR VALUE MEASUREMENT
FAIR VALUE MEASUREMENT	20. FAIR VALUE MEASUREMENT As of December 31, 2019 and 2020, information about inputs into the fair value measurement of the Group’s assets and liabilities that are measured at fair value on a recurring basis in periods subsequent to their initial recognition is as follows: Fair value measurement at December 31, 2019 Quoted prices in active Significant Total fair markets for other Significant value at identical observable unobservable December 31, assets inputs inputs 2019 (Level 1) (Level 2) (Level 3) RMB RMB RMB RMB Description Cash equivalents Money market funds 312,635 — 312,635 — Time deposits 23,849 — 23,849 — Total 336,484 — 336,484 — Fair value measurement at December 31, 2020 Quoted prices in active Significant Total fair markets for other Significant value at identical observable unobservable December 31, assets inputs inputs 2020 (Level 1) (Level 2) (Level 3) RMB US$ RMB RMB RMB Description Cash equivalents Money market funds 232,579 35,644 — 232,579 — Total 232,579 35,644 — 232,579 — 20. FAIR VALUE MEASUREMENT (continued) The Group measured the fair value of its money market funds and time deposits based on alternative pricing sources and models utilizing market observable inputs and has classified those as level 2 measurement. There were no transfers of fair value measurements into or out of Level 3 for the years ended December 31, 2018, 2019 and 2020. The Group measures certain financial assets, including the investment under the measurement alternative method and equity method at fair value on a nonrecurring basis only if they were determined to be impaired on an other-than-temporary basis. The Group’s non-financial assets, such as intangible assets, goodwill and property and equipment, would be measured at fair value when an impairment charge is recognized.

SEGMENT REPORTING

SEGMENT REPORTING	12 Months Ended
SEGMENT REPORTING	Dec. 31, 2020
SEGMENT REPORTING
SEGMENT REPORTING	21. SEGMENT REPORTING The Group engages primarily in sports information services and online spot commodity trading services in the PRC. After acquiring the business of online lottery betting and online casino platforms generated from the Multi Group, the Group distinguishes revenues, costs and expenses between different geographic operating segment in its internal reporting, and reports costs and expenses by nature in different geographic operating segments. In accordance with ASC topic 280, “ Segment Reporting” 21. SEGMENT REPORTING (continued) The following table presents summary information by segment for continuing operations for the years ended December 31, 2018, 2019 and 2020, respectively. For the year ended December 31, 2018 PRC Europe Total RMB RMB RMB Net revenues 20,578 105,511 126,089 Depreciation and amortization 31,027 31,511 62,538 Operating loss from continuing operations 327,850 16,638 344,488 Interest income 15,308 — 15,308 Income tax (benefit) expense (21,014) 1,412 (19,602) Segment net loss from continuing operations 453,687 18,050 471,737 Segment assets 1,204,057 42,527 1,246,584 For the year ended December 31, 2019 PRC Europe Total RMB RMB RMB Net revenues 4,092 35,596 39,688 Depreciation and amortization 32,575 28,811 61,386 Operating loss from continuing operations 438,008 204,831 642,839 Interest income 13,448 — 13,448 Income tax benefit (171) (7,471) (7,642) Segment net loss from continuing operations 449,257 205,029 654,286 Segment total assets 674,851 20,928 695,779 For the year ended December 31, 2020 PRC Europe Total Total RMB RMB RMB US$ Net revenues 6,886 14,929 21,815 3,343 Depreciation and amortization 43,810 1,974 45,784 7,016 Operating loss from continuing operations 182,142 8,650 190,792 29,241 Interest income 9,093 — 9,093 1,394 Income tax benefit (3,594) (60) (3,654) (560) Segment net loss from continuing operations 212,506 8,590 221,096 33,885 Segment total assets 457,056 13,417 470,473 72,103

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2020
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	22. SUBSEQUENT EVENTS Purchase cryptocurrency mining machines In January 2021, the Company entered into a definitive purchase agreement with certain sellers, pursuant to which the Company expects to issue approximately US$14.4 million worth of its Class A ordinary shares as consideration to acquire bitcoin mining machines owned by the sellers. As of March 15, 2020, the Company had issued 11,882,860 newly-issued Class A ordinary shares valued at US$1.21 per share, for a total consideration of approximately US$14.4 million to acquire 100% equity interest of Star Light Inc., which owned bitcoin mining machines including such models as the S17, T17, M20s and S9. The Company has begun to generate revenue from bitcoin mining of these machines. The total hash power capacity of the bitcoin mining machines acquired in this transaction is approximately 918.5 PH/S. In February 2021, the Company entered into a definitive purchase agreement for 5,900 bitcoin mining machines for a total consideration of approximately RMB55.2 million (approximately US$8.5 million). As of the date of this report, the Company has received 26 bitcoin mining machines which have been deployed for testing. All of the bitcoin mining machines are expected to be delivered in the second quarter of 2021. Concurrently with the purchase agreement, the Company entered into a framework agreement, pursuant to which the Company agreed in principle to purchase up to 10,000 bitcoin mining machines in 2021, subject to availability and certain other conditions. The Company is required to pay a performance bond of RMB2,000 per machine for the first 5,000 machines, or RMB10.0 million (approximately US$1.5 million) in aggregate. As of the date of this report, the transaction is still in progress. In February 2021, the Company entered into a definitive agreement with a seller, a subsidiary of Bitdeer Technologies Holding Company ("BitDeer"), to purchase 1,923 S17 bitcoin mining machines for a total consideration of RMB31.3 million (approximately US$4.9 million). The consideration has been paid in full, and the seller transferred ownership of all the mining machines. In February 2021, the Company entered into a definitive agreement to purchase 2,000 new ETH mining machines for a total consideration of RMB195 million (approximately US$30.2 million). Pursuant to the agreement, a total of 100 ETH mining machines are to be delivered during May and June 2021, a total of 300 ETH mining machines are to be delivered during July and August 2021, and the remaining 1,600 ETH mining machines are to be delivered during September and December 2021. As of the date of this report, the transaction is still in progress. 22. SUBSEQUENT EVENTS (continued) Private Placement Subscription Price Settled in U.S. Dollars and Bitcoin In December 2020, the Company entered into a definitive share subscription agreement with Good Luck Information Technology Co., Limited (“Good Luck Information”), a company incorporated in Hong Kong, for the issuance and sale of newly issued Class A ordinary shares of the Company. Pursuant to the agreement, Good Luck Information will purchase 85,572,963 newly issued Class A ordinary shares for a total purchase price of approximately US$23 million. The per share purchase price of US$0.269 is the closing trading price of the Company's ADSs on December 18, 2020, the last trading day immediately preceding the date of the purchase agreement, as adjusted by a 1-to-10 ADS to ordinary shares ratio. In January 2021, the Company determined that 50% of the subscription price, or approximately US$11.5 million, shall be settled by U.S. dollars, with the remaining 50% of the subscription price, or approximately US$11.5 million, being settled by bitcoin. The applicable bitcoin to U.S. dollars exchange rate was US$32,326.29 to one bitcoin, being the average of the closing trading prices for bitcoin published by Coinmarketcap for each of the 31 days ended January 20, 2021. On February 23, 2021, the Company announced the closing of the private placement transaction pursuant to the definitive share subscription agreement with Good Luck Information. The Company received 356.04342 bitcoins and US$11.5 million in cash from Good Luck Information, and issued 85,572,963 newly issued Class A ordinary shares to Good Luck Information. Good Luck Information has agreed to subject all the shares it or its affiliate will acquire in the transaction to a contractual lock-up restriction for 180 days after the closing. Good luck Information is controlled by Mr. Man San Vincent Law, a founder of the Company. Upon closing, Good Luck Information holds 16.6% of the Company’s issued and outstanding ordinary shares. Subscription for Shares of Loto Interactive Limited In January 2021, the Company entered into a share subscription agreement, pursuant to which the Company conditionally agreed to subscribe for 169,354,839 shares of Loto Interactive Limited (HKEX: 08198), or Loto Interactive, at a price of HK$0.62 per share for a total consideration of approximately HK$105 million (approximately US$13.5 million) in cash. Loto Interactive and its subsidiaries are principally engaged in the provision of data analysis and storage services, distribution of mobile gaming and the money lending business in Hong Kong. Loto Interactive currently runs three big data centers and offers a comprehensive set of services, including premises, hardware support, power supply, ancillary supervision and management services. The customers of Loto Interactive's big data centers are mainly engaged in cryptocurrency mining business. Concurrently with the Company's entering into the share subscription agreement, Loto Interactive has entered into an acquisition agreement, pursuant to which it has agreed to acquire the remaining equity interests in its indirectly held subsidiary, Ganzi Changhe Hydropower Consumption Service Co., Ltd, or Ganzi Changhe, from two sellers for a total consideration of approximately RMB88.2 million (approximately US$13.6 million) in cash. Upon completion of the transactions contemplated by the acquisition agreement, Loto Interactive expects to own 100% of the equity interests in Ganzi Changhe. Ganzi Changhe was incorporated in 2019 and has access to a total power capacity of approximately 300,000 kW. The Company has fully paid the consideration at the end of March 2021. The Company’s equity share in Loto Interactive has increased to 54.2% and Loto Interactive has become a subsidiary of the Company. 22. SUBSEQUENT EVENTS (continued) Acquisition of BTC.com Businesses In February 2021, the Company entered into a share exchange agreement with Blockchain Alliance Technologies Holding Company (“Blockchain Alliance”), a Cayman Islands company, pursuant to which the Company agreed to issue an aggregate of 44,353,435 Class A ordinary shares of the Company to Blockchain Alliance at the first closing, which shares represent approximately 10% of the Company’s outstanding shares as of January 31, 2021, in exchange for the entire outstanding share capital of Blockchain Alliance Technologies Limited held by Blockchain Alliance after the reorganization. The first closing of the transactions contemplated by the share exchange agreement is subject to certain closing conditions, which include, among others, the transfer to the Company of the entire mining pool business of Bitdeer Technologies Holding Company (“BitDeer”) operated under BTC.com, including the domain name BTC.com and the cryptocurrency wallet of BTC.com (collectively, the “BTC.com Pool Businesses”). The first closing is expected to occur on or before April 15, 2021. The Company and Blockchain Alliance also agreed that, if the BTC.com Pool Businesses record net operating profit in the fiscal year ending December 31, 2021, the Company shall issue additional Class A ordinary shares to Blockchain Alliance at par value. Assuming such net operating profit is no less than US$20 million, a maximum of 22,176,718 additional Class A ordinary shares shall be issuable, which additional Class A ordinary shares represent approximately 5% of the Company’s outstanding shares as of January 31, 2021. If the BTC.com Pool Businesses record net operating loss in the fiscal year ending December 31, 2021, the Company shall be entitled to repurchase certain Class A ordinary shares held by Blockchain Alliance at par value. Assuming such net operating loss is no less than US$10 million, a maximum of 4,435,344 Class A ordinary shares shall be subject to such repurchase arrangement, which Class A ordinary shares represent approximately 1% of the Company’s outstanding shares as of January 31, 2021. The BTC.com Pool Businesses offer a one-stop mining experience for users. Users can search and browse real-time blockchain information through BTC.com and manage their cryptocurrency mining business through the BTC.com Pool website or app. In addition, users can save the cryptocurrencies that they have mined in the BTC.com cryptocurrency wallet. BTC.com Pool is a multi-currency integrated mining pool established in 2016 that has a hash rate of around 17 EH/s and supports various cryptocurrencies, including BTC, BCH, ETH and LTC. Blockchain Alliance has agreed to subject the Class A ordinary shares that it receives in the abovementioned transactions to agreed lock-up periods in accordance with the share exchange agreement. BitDeer is the parent company of Blockchain Alliance. BitDeer's biggest beneficially owner is Mr. Wu Jihan, BitDeer's chairman. As of the date of this report, the transaction is still in progress. 22. SUBSEQUENT EVENTS (continued) Changes to Company Names and Ticker Symbol In March 2021, a majority of the Company’s board of directors resolved to change the Company’s (i) English name to “BIT Mining Limited”, or the English Name Change, subject to shareholder approval being received for the English Name Change, (ii) Chinese business name to “ 比特矿业比特矿业 Acquisition of a 7-nanometer Mining Machine Manufacturer In April 2021, the Company entered into a share exchange agreement ("Share Exchange Agreement") with shareholders (the "Selling Shareholders") of Bee Computing (HK) Limited (“Bee Computing”). Pursuant to the Share Exchange Agreement, the Company expects to issue an aggregate of 45,825,530 of its Class A ordinary shares valued at US$2.182 per share, corresponding to US$21.82 per ADS (based on the ratio of ten ordinary shares per ADS), representing a consideration of US$100 million in aggregate, to the Selling Shareholders and research and development team members, in exchange for the total issued share capital of Bee Computing. The 45,825,530 Class A ordinary shares represent approximately 8.18% of the Company’s total outstanding share capital as of March 31, 2021. The price of US$21.82 per “ADS” is based on the volume weighted average price of the twenty trading days prior to the date of the Share Exchange Agreement. This transaction is subject to the completion of certain conditions precedent to the closing of the transaction, including Bee Computing’s satisfactory completion of certain reorganization steps and other required closing conditions. There can be no assurance that the closing conditions will be satisfied, or that the proposed transaction will be consummated. 22. SUBSEQUENT EVENTS (continued) Acquisition of a 7-nanometer Mining Machine Manufacturer Pursuant the Share Exchange Agreement, the Company shall, subject to customary conditions, issue at the first closing an aggregate of 16,038,930, or US$35 million worth, of its Class A ordinary shares to the Selling Shareholders. The first closing is expected to occur in the second quarter of 2021. Subject to satisfaction of the following milestones, the Company shall issue at the subsequent closing an aggregate of 29,786,600, or US$65 million worth, of its Class A ordinary shares to Selling Shareholders and research and development team members: 1) Continuous mass-production of bitcoin mining machines incorporated with 7-nanometer application specific integrated circuits (“ASICs”); 2) Development and mass-production of new generation of bitcoin mining machines incorporated with 7-nanometer ASICs; 3) Successful development of high-performance and mass-producible ETH ASIC mining machines; 4) Successful development of high-performance and mass-producible LTC ASIC The Company’s Class A ordinary shares issued pursuant to the Share Exchange Agreement shall be subject to an agreed lock-up period. Bee Computing was established in 2018 and specializes in the development and manufacture of cryptocurrency mining chips and mining machines for different cryptocurrencies, including BTC, ETH, and LRC. Bee Computing has invested more than US$35 million in research and development since its inception. In 2019, Bee Computing launched a bitcoin mining machine incorporating 7-nanometer ASICs co-developed with MediaTek Inc., the largest IC design company in Asia, manufactured by Taiwan Semiconductor Manufacturing Company, the world’s leading third-party foundry, and tested and packaged by ASE Technology Holding Co., Ltd., the world’s largest semiconductor testing company, who is also a major investor of Bee Computing. The Company purchased Bee Computing's bitcoin mining machines incorporating 7-nanometer ASICs on February 2, 2021, and the mining machines are expected to be delivered by the end of April 2021. The company plans to invest no less than US$30 million in Bee Computing to develop cryptocurrency mining chips and mining machines after first closing. Appointment of Director and Initiative to Enhance Shareholding Structure Effective as of April 5, 2021, the Company's Board of Directors has appointed Mr. Man San Vincent Law as its Executive Director, and authorized the Company to issue 65,000 Class A preference shares (the “Preference Shares”) at US$1.0 per share, for a total consideration of US$65,000, to Good Luck Capital Limited (“Good Luck”), a company wholly-owned by Mr. Law. Following the issuance of the Preference Shares, Mr. Man San Vincent Law’s aggregate voting power increased from approximately 17.66% to approximately 60.28% (based on the Company’s total outstanding share capital as of March 31, 2021 and assuming issuance of all shares under the Share Exchange Agreement). The following is a summary of the key terms associated with the Preference Shares. 1) The voting power of each Preference Share is equal to that of 10,000 Class A ordinary shares of the Company, subject to proportional reduction commensurate with the number of Class A ordinary shares beneficial owned by Good Luck; 2) The Preference Shares cannot be converted into Class A ordinary shares, Class B ordinary shares, or ADRs; 3) The Preference Shares are not entitled to receive dividends; 22. SUBSEQUENT EVENTS (continued) Acquisition of a 7-nanometer Mining Machine Manufacturer 4) If Good Luck transfers the Preference Shares to a third party which is not an affiliate of Good Luck, or when Good Luck ceases to be controlled by any person holding executive office in or being a member of the board of director of the Company, Class A Preference Shares shall cease to have any voting right and 5) If Mr. Law ceases to serve as a director of the Company, the Company shall be entitled to redeem the Class A Preference Shares at the original subscription price. The Company received the consideration of US$65,000 and issued 65,000 Class A preference shares to Good Luck on April 7, 2021. Mr. Man San Vincent Law is a major founder of the Company. He has served as a Senior Adviser of Loto Interactive Limited since 2017. From 2001 to 2015, Mr. Law served as the Company’s chief executive officer and was chairman of the Company’s board of directors from 2001 to 2017. Material Loans entered by the Company In January 2021, for the purpose of acquisition, the Company entered into a loan agreement with Shanghai Bank, to borrow the overseas loan for a period of six months, with an amount of HKD173.4 million and a fixed interest rate of 6MHIBOR+200BPs per annum. The Company’s cash deposits in the amount of RMB155 million has been pledged under the loan. In March 2021, part of the loan in the amount of HKD15.6 million has been repaid. In January 2021, the Company entered into a loan agreement to borrow RMB8 million for no more than three months, with a fixed interest rate of 6% per annum. In March 2021, part of the loan in the amount of RMB5 million has been repaid. In January 2021, the Company further entered into loan agreements to borrow RMB 10 million and HKD 11 million, respectively, for no more than three months, with a fixed interest rate of 6% per annum. As of the date of this annual report, both loans have been fully repaid. In March 2021, the Company, entered into a loan agreement and a pledge agreement for one year, pursuant to which the lender agreed to lend to the Company funds equal to 70% of the current fair market value (the “Loan-to-Value Ratio”) of 350.00971804 bitcoins, with a fixed interest rate of 3.25% per annum and 2% service fee. As of the date of this report, the loan principal obtained by the Company is US$14.28 million.

CONDENSED FINANCIAL INFORMATION

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY	12 Months Ended
CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY	Dec. 31, 2020
CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY
CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY	23. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY The Company performed a test on the restricted net assets of the consolidated subsidiaries and VIEs in accordance with Securities and Exchange Commission Regulation S-X Rule 4-08 (e) (3), “General Notes to Financial Statements” and concluded that it was applicable for the Company to disclose the financial information for the parent company only. 23. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (continued) The subsidiaries did not pay any dividend to the Company for the periods presented. Certain information and note disclosures generally included in the financial statements prepared in accordance with U.S. GAAP have been condensed and omitted. The note disclosures contain supplemental information relating to the operations of the Company, as such, these statements should be read in conjunction with the notes to the consolidated financial statements of the Company. As of December 31, 2020, the Company did not have significant capital commitments and other significant commitments, or guarantees, except for those which have been separately disclosed in the consolidated financial statements. The following is the condensed financial information of the Company on a parent company only basis. Condensed balance sheets As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 6,116 3,325 510 Other current assets 9,101 8,465 1,297 Amounts due from intergroup companies 515,160 470,077 72,042 Total current assets 530,377 481,867 73,849 Non-current assets: Investment in subsidiaries and VIEs 62,087 (53,317) (8,172) Property and equipment, net 82 — — Total non-current assets 62,169 (53,317) (8,172) TOTAL ASSETS 592,546 428,550 65,677 23. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (continued) Condensed balance sheets As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Accrued payroll and welfare payable 390 840 129 Accrued expenses and other liabilities 3,139 6,752 1,035 Amounts due to intergroup companies 4,561 17,181 2,633 Total current liabilities 8,090 24,773 3,797 TOTAL LIABILITIES 8,090 24,773 3,797 Shareholders’ equity: Class A ordinary shares, par value US$0.00005 per share, 700,000,000 shares authorized as of December 31, 2019 and 2020; 420,001,792 and 430,127,692 shares issued outstanding 145 151 22 Class B ordinary shares, par value US$0.00005 per share; 300,000,000 shares authorized as of December 31, 2019 and 2020; 10,000,099 and 99 shares issued and outstanding as of December 31, 2019 and 2020, respectively 6 — — Additional paid-in capital 2,547,293 2,602,883 398,909 Treasury shares (143,780) (143,780) (22,035) Accumulated other comprehensive income 141,484 128,441 19,684 Accumulated deficit and statutory reserve (1,960,692) (2,183,918) (334,700) Total shareholder’s equity 584,456 403,777 61,880 TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY 592,546 428,550 65,677 23. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (continued) Condensed statements of comprehensive loss For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net revenues — — — — Operating expenses: Sales and marketing (1,784) (57) (30) (5) General and administrative (177,455) (29,437) (57,542) (8,819) Total operating expenses (179,239) (29,494) (57,572) (8,824) Operating loss (179,239) (29,494) (57,572) (8,824) Interest income 2 122 237 36 Equity in loss of subsidiaries and VIEs (272,436) (621,896) (165,891) (25,423) Loss before income tax (451,673) (651,268) (223,226) (34,211) Net loss (451,673) (651,268) (223,226) (34,211) Other comprehensive income Foreign currency translation gain (loss) 21,685 7,734 (11,825) (1,812) Share of other comprehensive loss from an equity method investee — (3,986) (1,218) (187) Comprehensive loss (429,988) (647,520) (236,269) (36,210) Condensed statements of cash flows For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net cash used in operating activities (91,547) (29,759) (17,685) (2,710) Net cash used in investing activities (56,941) (58,359) (13,028) (1,997) Net cash provided by financing activities 159,456 81,693 28,213 4,324 Effect of exchange rate changes on cash and cash equivalents 66 203 (291) (45) Net increase (decrease) in cash and cash equivalents 11,034 (6,222) (2,791) (428) Cash and cash equivalents at beginning of the year 1,304 12,338 6,116 938 Cash and cash equivalents at end of the year 12,338 6,116 3,325 510 23. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (continued) Basis of presentation Condensed financial information is used for the presentation of the Company, or the parent company. The condensed financial information of the parent company has been prepared using the same accounting policies as set out in the Group’s consolidated financial statements except that the parent company used the equity method to account for its investment in its subsidiaries and VIEs. The parent company records its investment in its subsidiaries and VIEs under the equity method of accounting as prescribed in ASC 323, “ Investments-Equity Method and Joint Ventures”. The parent company’s condensed financial information should be read in conjunction with the Group’s consolidated financial statements.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Principles of consolidation	Principles of consolidation The consolidated financial statements of the Group include the financial statements of the Company, its subsidiaries and VIEs in which it has a controlling financial interest. The results of the subsidiaries are consolidated from the date on which the Group obtained control and continue to be consolidated until the date that such control ceases. A controlling financial interest is typically determined when a company holds a majority of the voting equity interest in an entity. Furthermore, if the Company demonstrates that it has ability to control the VIEs through its rights to all the residual benefits of the VIEs and its obligation to fund losses of the VIEs then the entity is consolidated. All significant intercompany balances and transactions among the Company, its subsidiaries and VIEs have been eliminated on consolidation. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued)
Reclassification	Reclassification Certain prior year amounts have been reclassified to conform to the current period presentation. These reclassifications had no impact on net earnings and financial position.
Convenience translation	Convenience translation Translations of amounts from RMB into US$ for the convenience of the reader were calculated at the noon buying rate of US$ 1.00
Foreign currency translation	Foreign currency translation The functional currency of the Company, BVI, 500wan HK, 500.com USA and 500.com JP is the US$. The functional currency of the Multi Group and its subsidiaries is EUR. E-Sun Sky Computer with its VIEs determined their functional currencies to be the RMB, which is their respective local currencies based on the criteria of ASC 830, “ Foreign Currency Matters” Transactions denominated in foreign currencies are re-measured into the functional currency at the exchange rates prevailing on the transaction dates. Exchange gains and losses resulting from foreign currency transactions are included in the consolidated statements of comprehensive loss.
Business combinations and noncontrolling interests	Business combinations and non-controlling interests The Group accounts for its business combinations using the purchase method of accounting in accordance with ASC 805 (“ASC 805”), “ Business Combinations” The determination and allocation of fair values to the identifiable assets acquired, liabilities assumed and non-controlling interests is based on various assumptions and valuation methodologies requiring considerable judgment from management. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. The Group determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of assets, forecasted life cycle and forecasted cash flows over that period. 2. (continued) Business combinations and noncontrolling interests For the Company's majority-owned subsidiaries and VIEs, non-controlling interests are recognized to reflect the portion of their equity which is not attributable, directly or indirectly, to the Group. “Net loss” on the consolidated statements of comprehensive loss include the “net loss attributable to non-controlling interests”. The cumulative results of operations attributable to non-controlling interests are also recorded as non-controlling interests in the Company's consolidated balance sheets.
Cash and cash equivalents	Cash and cash equivalents Cash and cash equivalents represent cash on hand and time deposits, which have original maturities of three months or less when purchased and which are unrestricted as to withdrawal and use. In addition, highly liquid investments which have original maturities of three months or less when purchased are classified as cash equivalents.
Restricted cash and Time deposits	Restricted cash Restricted cash represents cash held by banks which were granted by the government and designated only for the purchase of fixed assets for certain approved projects and deposits in merchant bank where withdrawals are currently restricted. Time deposits Time deposits represent deposits in commercial banks with original maturities of greater than three months but less than a year. Interest income from time deposits is included in the consolidated statements of comprehensive loss.
Allowance for doubtful accounts	Allowance for doubtful accounts Receivables are carried at original invoiced amount less an allowance for doubtful accounts when collection of the amount is no longer probable. Prior to January 1, 2020, in evaluating the collectability of receivable balances, the Group considers factors such as customer circumstances or age of the receivable. Receivables are written off after all collection efforts have ceased. Collateral is not typically required, nor is interest charged on receivables. Starting from January 1, 2020, the Group adopted ASU No. 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments
Property and equipment, net	Property and equipment, net Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, as follows: Category Estimated Useful Life Estimated Residual Electronics and office equipment 3- 5 5 % Motor vehicles 5-10 years 2-5 % Leasehold improvements Shorter of lease term or the estimated useful lives of the assets — Repair and maintenance costs are charged to expense as incurred, whereas the cost of renewals and betterment that extend the useful lives of property and equipment are capitalized as additions to the related assets. Retirements, sales and disposals of assets are recorded by removing the cost and accumulated depreciation from the asset and accumulated depreciation accounts with any resulting gain or loss reflected in the consolidated statements of comprehensive loss.
Intangible assets	Intangible assets Intangible assets represent computer software, internet domain name, licensing agreement, and intangible assets arising from business combination. Computer software, internet domain name and licensing agreement purchased from third parties are initially recorded at cost and amortized on a straight-line basis over their estimated useful lives of the respective assets. The Group performs valuation of the intangible assets arising from business combination to determine the relative fair value to be assigned to each asset acquired. The acquired intangible assets are recognized and measured at fair value and are expensed or amortized using the straight-line approach over the estimated useful life of the assets. Estimated useful lives of the respective assets are set out as follows: Category Estimated Useful Life Computer software 3-10 years Internet domain name 10 years Licensing agreement Agreement term Intangible assets arising from business combination Licenses and brand name 10 years Mobile applications and software 5 years
Goodwill	Goodwill The Group assesses goodwill for impairment in accordance with ASC 350-20 (“ASC 350-20”), “ Intangibles–Goodwill and Other: Goodwill” 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Goodwill Prior to the early adoption of ASU 2017-04, “ Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued Accounting Standards Update No. 2017-04(“ASU 2017-04”), “ Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. As triggered by TMG’s temporary suspension of its operations in Sweden since January 2020, the Group performed qualitative and quantitative assessment in accordance with ASU 2017-04 and recognized a full impairment loss of RMB129,752 for goodwill arising from acquisition of TMG during the year ended December 31, 2019.
Impairment of long-lived assets other than goodwill	Impairment of long-lived assets other than goodwill The Group evaluates its long-lived assets or asset group, including property and equipment, intangible assets and right-of-use assets, with finite lives for impairment whenever events or changes in circumstances (such as a significant adverse change to market conditions that will impact the future use of the assets) indicate that the carrying amount of a group of long-lived assets may not be fully recoverable. When these events occur, the Group evaluates the impairment by comparing the carrying amount of the assets to future undiscounted cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flow is less than the carrying amount of the assets, the Group recognizes an impairment loss based on the excess of the carrying amount of the asset group over its fair value. The Group provided an impairment loss of nil,
Long-term investments	Long-term investments The Group’s longterm investments consist of equity investments without readily determinable fair value and equity method investments. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Long-term investments (continued) For those investments over which the Group does not have significant influence and without readily determinable fair value, the Group records them at cost, less impairment, and plus or minus subsequent adjustments for observable price changes, in accordance with ASC Topic 321 (“ASC 321”), “ Investments Equity Securities Management regularly evaluates the impairment of these investments based on performance and financial position of the investee as well as other evidence of market value. Such evaluation includes, but is not limited to, reviewing the investee’s cash position, recent financing, projected and historical financial performance, cash flow forecasts and financing needs. An impairment loss is recognized in earnings equal to the excess of the investment’s cost over its fair value at the balance sheet date of the reporting period for which the assessment is made. The fair value would then become the new cost basis of investment. Investments in entities in which the Group can exercise significant influence but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC Topic 323 (“ASC 323”), “ Investments-Equity Method and Joint Ventures According to the above testing, impairment losses of RMB149,896, RMB22,353 and RMB33,001 (US$5,058) for the long-term investments were recognized during the years of 2018, 2019 and 2020, respectively. Investments in limited partnerships greater than 5% are considered more than minor and accounted for using the equity method, unless it is readily apparent that the Group has virtually no influence over the partnership’s financial and operating policies.
Fair Value measurements	Fair value measurements Financial instruments primarily include cash and cash equivalents, restricted cash, time deposits, prepayments and other receivables, equity security without readily determinable fair values, equity method investments, and accrued expense and other current liabilities. The Group carries the investment under the measurement alternative method and equity method on other-than-temporary basis. The carrying values of other financial instruments, approximate their fair values due to their short-term maturities. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Fair value measurements (continued) The Group's non-financial assets, including intangible assets, goodwill and property and equipment are measured at fair value when an impairment charge is recognized. The Group applies ASC 820 (“ASC 820”), “Fair Value Measurements and Disclosures ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1— Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2— Include other inputs that are directly or indirectly observable in the marketplace. Level 3— Unobservable inputs which are supported by little or no market activity. ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach, and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.
Related party transactions	Related party transactions A related party is generally defined as (i) any person holds 10% or more of the Company’s securities and their immediate families (ii) the Company’s management, (iii) someone that directly or indirectly controls, is controlled by or is under common control with the Company, or (iv) anyone who can significantly influence the financial and operating decisions of the Company. A transaction is considered to be a related party transaction when there is a transfer of resources or obligations between related parties. Related parties may be individuals or corporate entities. Transactions involving related parties cannot be presumed to be carried out on an arm’s-length basis, as the requisite conditions of competitive, free market dealings may not exist. Representations about transactions with related parties, if made, shall not imply that the related party transactions were consummated on terms equivalent to those that prevail in arm’s-length transactions unless such representations can be substantiated. It is not, however, practical to determine the fair value of amounts due from/to related parties due to their related party nature.
Revenue recognition	Revenue recognition The Group’s revenues were derived principally from online gaming services, sports information services, and online spot commodity trading services. The Group adopted ASC Topic 606 “ Revenue from Contracts with Customers Revenue is recognized when control of promised goods or services is transferred to the Group's customers in an amount of consideration to which the Group expects to be entitled to in exchange for those goods or services. The Group follows the five steps approach for revenue recognition under Topic 606: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract, and (v) recognize revenue when (or as) the Group satisfies a performance obligation. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Revenue recognition (continued) The Group set up an implementation schedule and analyzed each of the Group’s revenue streams in accordance with ASC 606 to determine the impact on the Group’s consolidated financial statements. After the analyzation, the Group concluded that there was no substantial impact on the Group’s consolidated financial statements upon the adoption of ASC 606. The primary sources of the Group’s revenues are as follows: Sports information services The Group offers a comprehensive sports information portal via a designated mobile application, which covers (i) real time soccer match information; and (ii) data-driven soccer match predictions generated by proprietary analysis engine. Users can also post free or pay-per-view contents such as proprietary observations and analyses on the sports information portal. The users pay for each information and data subscription at a fixed price, and the Group pays the original information providers a fixed percentage of total purchase amount if the information is produced by third parties. Revenue is recognized when users have access to the pay-per-view contents or on an average amortization basis according to subscription terms. The Group records the revenue on a net basis for information provided by third parties, because the Group is not the primary obligor to provide the information, but acts as an agent in providing such purchase services. For information provided by the Group itself, the Group records the revenue on a gross basis. The Group provides sports information service through the Group’s service offering named “Cai Xun Hao,” which was ceased in March 2019, and "Smart Big Data", which was started in June 2020. Online spot commodity trading services The Group provides online spot commodity trading services through the designated website and mobile application in Shenzhen Kaisheng. The Group provides customers with reliable online spot commodity trading for gold trade and delay products across PC and mobile devices. The Group processes customer orders through a commercial bank, and later formed a joint venture with Shenzhen Gold Exchange on May 11, 2018 to provide online spot commodity trading services. Trading commissions are received from the commercial bank based on the pre-determined commission fee rate and the total amount of the processed orders. The Group recognizes revenue at a point in time when an order has been successfully processed and began to generate an immaterial amount of revenue each year from trading commissions on the online spot commodity trading services since 2017. Online gaming services The Group also provides online lottery betting and online casino platforms through the Group’s designated website after the acquisition of TMG in July 2017. The Group earns difference between betting and winning for online lottery betting services and online casino platforms as revenues that are generated from the registered users. The registered users enter into certain terms and conditions when they first open their accounts with the Group. Lottery and Casino purchase orders are placed by users through the Group’s online platforms view website. Then the Group processes these orders. Prior to processing orders, users prepay all purchase amounts. The Group pays users prizes when there are any winnings attributable to users. The Group records revenues on a net basis by deducting the winning amounts from betting amounts. Revenue comprises the fair value of the consideration received for the provision of internet gaming in the ordinary course of the Group’s activities, which is recognized when the outcome of an event is known. Contract balances The Group does not have any contract assets. The Group's contract liabilities include advance from customers, which is recorded when consideration is received from a customer prior to providing services to the customer under the terms of a contract. As of December 31, 2019 and 2020, the Group recorded advance from customers balance of RMB5,012 and RMB4,734 (US$726) respectively, which was included in “Accrued expenses and other current liabilities” on the accompanying consolidated balance sheets. RMB4,477, RMB8,283 and RMB5,012 (US$768) of deferred revenue included in the opening balances of advance from customers was recognized during the years ended December 31, 2018, 2019 and 2020, respectively. The amounts were included in net revenues on the accompanying consolidated statements of comprehensive loss. Refer to Note 21 regarding the discussion of the Group's disaggregate revenue data.
Cost of services	Cost of services Account handling expenses Account handling expenses, which consist primarily of transaction fees charged by banks and third-party payment processors for cash transfers between the users’ accounts on the online platforms including websites and mobile applications and their accounts with banks or third-party payment processors, were RMB6.8 million, RMB2.9 million and RMB0.7 million (US$0.1 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Server leasing and maintenance expenses Server leasing and maintenance expenses, which consist primarily of leasing expense of servers and other equipment used in providing online services, were RMB6.1 million, RMB4.2 million and RMB3.2 million (US$0.5 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Lottery insurance expenses Lottery insurance expenses, which consist of insurance premiums payable to insurers for covering the first two categories of winnings in online gaming services for betting on the outcome of lotteries after the acquisition of TMG in July 2017, were RMB20.4 million, RMB9.9 million and RMB5.1 million (US$0.8 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Platform fee Platform fees, which consist of fees payable to online gaming software suppliers for providing various online casino games on TMG’s websites after the acquisition of TMG in July 2017, were RMB12.1 million, RMB6.6 million and RMB0.3 million (US$0.05 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. Regulatory and compliance fees Regulatory and compliance fees, which consist of fees payable to regulatory bodies such as Gambling Commission, HM Revenue & Customs, Malta Gaming Authority and Certria EOOD after the acquisition of TMG in July 2017, were RMB2.0 million, RMB1.6 million and RMB1.8 million (US$0.3 million) in 2018, 2019 and 2020, respectively. These costs are expensed as incurred. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Amortization fees Amortization fees, which consist primarily of amortization of intangible assets arising from business combinations, were RMB31.5 million, RMB28.4 million and RMB1.6 million (US$0.2 million) in 2018, 2019 and 2020, respectively. These costs are recorded in consolidated statements of comprehensive loss on a straight-line basis over the useful life of the intangible assets. Cost of services also comprises employee costs, business tax and surcharges and other direct costs incurred in providing services. These costs are expensed as incurred.
Sales and marketing expenses	Sales and marketing expenses Commission to certain internet companies The Group is responsible to pay certain internet companies a predetermined fixed percentage of the total purchase or deposit amount only if 1) public users enter the Group’s website by redirection through these internet companies’ website, and/or 2) public users have successfully purchased any lottery tickets, virtual tokens, or betting, or deposited certain amounts of cash into their accounts in the Group’s website. The Group is responsible for providing respective services when such public users enter the Group’s website to purchase lottery tickets, virtual tokens or betting. Since these internet companies are providing similar services as those services that have been provided by the Group’s internal sales personnel agent, any relevant costs to be paid by the Group is treated as sales and marketing expenses. Advertising expenditure Advertising costs which consist primarily of expenses associated with advertisements the Group placed on TV channels and other media, are expensed as incurred and are included in “sales and marketing expenses” in the consolidated statements of comprehensive loss. Advertising expenses for the years ended December 31, 2018, 2019 and 2020 were approximately RMB2.4 million, RMB0.5 million and nil, respectively. Sponsorship expenses The Group’s sales and marketing expenses also consist of payments under a sponsorship contract. Accounting for sponsorship payments is based upon specific contract provisions. Generally, sponsorship payments are expensed on a straight-line basis over the term of the contract after giving recognition to periodic performance provisions of the contract. Prepayments made under the contract are included in prepayments based on the period to which the prepayments apply.
Service development expenses	Service development expenses Service development expenses consist primarily of personnel-related expenses incurred for the development of, enhancement to, and maintenance of the Group’s website that either (i) did not meet the capitalization criteria in accordance with ASC 350, “Intangibles - Goodwill and other”
Leases	Leases Prior to 2019, the Group accounted for leases under ASC 840, Leases On January 1, 2019, the Group adopted ASU No. 2016-02, Leases (together with all amendments subsequently issued thereto, “ASC Topic 842”), using the modified retrospective method. The Group elected the transition method which allows entities to initially apply the requirements by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. As a result of electing this transition method, previously reported financial information has not been restated to reflect the application of the new standard to the comparative periods presented. The Group elected the package of practical expedients permitted under the transition guidance within ASC Topic 842, which among others, allows the Group to carry forward certain historical conclusions reached under ASC Topic 840 regarding lease identification, classification, and the accounting treatment of initial direct costs. The Group elected not to record assets and liabilities on its consolidated balance sheet for new or existing lease arrangements with terms of 12 months or less. The Group recognizes lease expenses for such leases on a straight-line basis over the lease term. The initial lease liability is equal to the future fixed minimum lease payments discounted using the Group’s incremental borrowing rate, on a secured basis. The initial measurement of the right-of-use asset is equal to the initial lease liability plus any initial direct costs and prepayments, less any lease incentives. When a lease is terminated, the right-of-use asset and operating lease liability associated with the lease are derecognized and any difference between the carrying amounts of the right-of-use asset and the lease liability is recognized in the consolidated statements of comprehensive loss as a gain or loss. The primary impact of applying ASC Topic 842 is the initial recognition of approximately RMB 61,636 of operating lease liabilities, and approximately RMB 54,275 of corresponding right-of-use assets, on the Group’s consolidated balance sheet as of January 1, 2019, for leases classified as operating leases under ASC Topic 840. There is no cumulative effect to retained earnings or other components of equity recognized as of January 1, 2019. The Group does not have finance lease arrangements as of December 31, 2020. All right-of-use assets are reviewed for impairment. The Group did not record any impairment on the right-of-use lease assets during the years ended December 31, 2019 and 2020.
Income taxes	Income taxes The Group follows the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial reporting and tax bases of assets and liabilities using enacted tax rates that will be in effect in the period in which the differences are expected to reverse. The Group records a valuation allowance to offset deferred tax assets if based on the weight of available evidence, it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. The effect on deferred taxes of a change in tax rates is recognized in the consolidated statements of comprehensive loss in the period that includes the enactment date. Interest and penalties arising from underpayment of income taxes are computed in accordance with the applicable tax law and is classified in the consolidated statements of comprehensive loss as income tax expense. The amount of interest expense is computed by applying the applicable statutory rate of interest to difference between the tax position recognized and the amount previously taken or expected to be taken in a tax return. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Income taxes (continued) In accordance with the provisions of ASC 740 (“ASC 740”), “Income taxes” In conjunction with ASC 740, the Group also applied ASC 740-30 (“ASC 740-30”), “ Income Taxes: Other Considerations or Special Areas”
Share-based compensation	Share-based compensation Share options and restricted shares granted to employees and directors Share options and restricted shares granted to employees and directors are accounted for under ASC 718 (“ASC 718”), “ Compensation - Stock compensation” ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in the subsequent period if actual forfeitures differ from initial estimates. Forfeiture rate is estimated based on historical and future expectation of employee turnover rate and is adjusted to reflect future change in circumstances and facts, if any. Share-based compensation expense is recorded net of estimated forfeitures such that expense was recorded only for those share-based awards that are expected to vest. To the extent the Group revises this estimate in the future, the share-based payments could be materially impacted in the period of revision, as well as in following periods. 2 (continued) Share-based compensation (continued) Share options and restricted shares granted to employees and directors (continued) The compensation costs associated with a modification of the terms of the award (“Modification Award”) are recognized if either the original vesting condition or the new vesting condition has been achieved. Such compensation costs cannot be less than the grant-date fair value of the original award. The incremental compensation cost is measured as the excess of the fair value of the Modification Award over the fair value of the original award at the modification date. Therefore, in relation to the Modification Award, the Group recognizes share-based compensation over the vesting periods of the new options, which comprises, (1) the amortization of the incremental portion of share-based compensation over the remaining vesting term, and (2) any unrecognized compensation cost of original award, using either the original term or the new term, whichever is higher for each reporting period. Share options granted to non-employees Prior to January 1, 2019, the Group records share-based compensation expense for awards granted to non-employees in exchange for services at fair value in accordance with the provisions of ASC 505-50, “ Equity-based payment to non-employees” Starting January 1, 2019, the Group adopted ASU 2018-07 which aligns accounting for share-based payments issued to nonemployees to that of employees under the existing guidance of Topic 718. The adoption did not pose any impact to the Group's retained earnings as all options granted to non-employees were fully vested prior to the adoption. The Group, with the assistance of an independent valuation firm, determined the fair values of the share options recognized in the consolidated financial statements. The binomial option pricing model is applied in determining the estimated fair value of the share options granted to employees and non-employees.
Earnings (Loss) per share	Earnings (loss) per share The Company computes earnings per Class A and Class B ordinary shares in accordance with ASC 260 (“ASC 260”), “ Earnings Per Share” The liquidation and dividend rights of the holders of the Company’s Class A and Class B ordinary shares are identical, except with respect to voting. As a result, and in accordance with ASC 260, the undistributed earnings for each year are allocated based on the contractual participation rights of the Class A and Class B ordinary shares as if the earnings for the year had been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the conversion of Class B ordinary shares is assumed in the computation of the diluted net loss per share of Class A ordinary shares, the undistributed earnings are equal to net loss for that computation. 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (continued) Earnings (loss) per share (continued) For the purposes of calculating the Company’s basic and diluted earnings (loss) per Class A and Class B ordinary shares, the ordinary shares relating to the options that were exercised are assumed to have been outstanding from the date of exercise of such options. The Company treated the excess amount of redemption price of the redeemable non-controlling interest over its fair value as being akin to a dividend, which indirectly affected in the calculation of loss available to ordinary shareholders of the Company used in the loss per share calculation.
Government grants	Government grants Government grants are recognized when there is reasonable assurance that the attached conditions will be complied with. When the grant relates to an expense item, it is recognized in the consolidated statements of comprehensive loss over the period necessary to match the grant on a systematic basis to the related costs. Where the grant relates to an asset acquisition, it is recognized in the consolidated statements of comprehensive loss in proportion to the depreciation of the related assets.
Treasury shares	Treasury shares The Group accounts for treasury shares using the cost method. Under this method, the cost incurred to purchase the shares is recorded in the treasury shares account on the consolidated balance sheets. At retirement, the ordinary shares account is charged only for the aggregate par value of the shares. The excess of the acquisition cost of treasury shares over the aggregate par value is allocated between additional paid-in capital (up to the amount credited to the additional paid-in capital upon original issuance of the shares) and retained earnings.
Recent accounting pronouncements	Recent accounting pronouncements In December 2019, the FASB issued ASU 2019-12, “ Simplifying the Accounting for Income Taxes In January 2020, the FASB issued ASU 2020-01, “ Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 Other accounting standards that have been issued or proposed by FASB that do not require adoption until a future date are not expected to have a material impact on the consolidated financial statements upon adoption. The Group does not discuss recent pronouncements that are not anticipated to have an impact on or are unrelated to its consolidated financial condition, results of operations, cash flows or disclosures.

ORGANIZATION (Tables)

ORGANIZATION (Tables)	12 Months Ended
ORGANIZATION (Tables)	Dec. 31, 2020
Schedule of Variable Interest Entity	Percentage of ownership Date of Place of by the Principal Entity establishment establishment Company activities Subsidiaries Fine Brand Limited (“BVI”) February 9, 2011 British Virgin Islands 100 % Investment Holding 500wan HK Limited (“500wan HK”) March 8, 2011 Hong Kong 100 % Investment Holding 500.com Nihon Co., Ltd. (“500.com JP”) July 27, 2017 Japan 100 % Investment Holding 500.com USA Corporation (“500.com USA”) July 21, 2014 USA 100 % Investment Holding E-Sun Sky Computer (Shenzhen) Co., Ltd. (“E-Sun Sky Computer”) June 18, 2007 PRC 100 % Software Service The Multi Group Ltd (“The Multi Group” or “TMG”) June 26, 2015 Malta 100 % Investment Holding Multi Warehouse Ltd**** December 3, 2014 Malta 93 % Online Gaming Multi Brand Gaming Ltd** October 3, 2014 Malta 93 % Online Gaming Multilotto UK Ltd** September1, 2016 Malta 93 % Online Gaming Lotto Warehouse Ltd** September1, 2016 Malta 93 % Online Gaming Wasp Media Ltd** August 12, 2016 Malta 93 % Online Gaming Round Spot Services Ltd** May 6, 2015 Cyprus 93 % Online Gaming Multi Pay N.V.** August 25, 2011 Curacao 93 % Online Gaming Oddson Europe Ltd**** January10, 2018 Malta 93 % Online Gaming VIEs Shenzhen E-Sun Network Co., Ltd. (“E-Sun Network”) December 7, 1999 PRC — Online Lottery Service Shenzhen Youlanguang Science and Technology Co., Ltd. (“Youlanguang Technology”) December 16, 2008 PRC — Online Lottery Service Shenzhen Guangtiandi Science and Technology Co., Ltd. (“Guangtiandi Technology”) December 16, 2008 PRC — Online Lottery Service Subsidiaries of the VIEs Shenzhen E-Sun Sky Network Technology Co., Ltd. (“E-Sun Sky Network”) * May 22, 2006 PRC — Online Lottery Service Lhasa Yicai Network Technology Co., Ltd. (“Lhasa Yicai”) October 17, 2014 PRC — Online Lottery Service Hainan Jingli Network Technology Co., Ltd. (“Hainan Jingli”) May 3, 2018 PRC — Software Service Shenzhen Yicai Network Technology Co., Ltd. (“Shenzhen Yicai”) * July 21, 2015 PRC — Online Lottery Service Shenzhen Kaisheng Jinfu Enterprise Management Co., Ltd. (“Shenzhen Kaisheng”) ** June 24, 2016 PRC — Online Spot Commodity Trading Services * A subsidiary of E-Sun Network A subsidiary of E-Sun Sky Network * A subsidiary of Youlanguang Technology ** A subsidiary of Guangtiandi Technology **** A subsidiary of the Multi Group
VIE [Member]
Carrying Amounts of Assets and Liabilities, Results of Operations and Cash Flows of VIEs	As of As of As of December December December 31, 2019 31, 2020 31, 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 194,914 194,510 29,810 Restricted cash 1,539 1,242 190 Time Deposit 100 — — Amounts due from intergroup companies 992 936 143 Amounts due from a related party 10,401 368 56 Prepayments and other current assets, net 14,608 12,781 1,960 Total current assets 222,554 209,837 32,159 Non-current assets: Property and equipment, net 44,354 15,181 2,327 Intangible assets, net 1,636 1,229 188 Deposits 5,117 424 65 Long-term investments 34,417 35,192 5,393 Right-of-use assets 33,633 9,327 1,429 Other non-current assets 1,887 1,665 255 Total non-current assets 121,044 63,018 9,657 TOTAL ASSETS 343,598 272,855 41,816 LIABILITIES Current liabilities: Amounts due to intergroup companies 367,368 374,379 57,376 Accrued payroll and welfare payable 4,830 12,288 1,883 Accrued expenses and other current liabilities 36,087 36,870 5,651 Operating lease liabilities - current 13,698 3,710 569 Income tax payable 1,525 — — Total current liabilities 423,508 427,247 65,479 Non-current liabilities: Long-term payables 2,965 526 81 Operating lease liabilities - non-current 31,675 5,807 890 Total non-current liabilities 34,640 6,333 971 TOTAL LIABILITIES 458,148 433,580 66,450 1. (continued) Information on Variable Interest Entities (“VIEs”) For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net revenues for continuing operations 20,578 4,093 6,886 1,055 Net revenues for discontinued operations 7,398 — — — Net loss for continuing operations (103,383) (135,816) (60,464) (9,267) Net income for discontinued operations 2,183 — — — For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net cash used in operating activities (93,142) (80,729) (38,888) (5,960) Net cash provided by (used in) investing activities 11,164 (254) 18,440 2,826 Net cash provided by financing activities 104,453 152,701 19,747 3,026

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Schedule of Property and Equipment	Category Estimated Useful Life Estimated Residual Electronics and office equipment 3- 5 5 % Motor vehicles 5-10 years 2-5 % Leasehold improvements Shorter of lease term or the estimated useful lives of the assets —
Estimated Useful Lives of Intangible Assets	Category Estimated Useful Life Computer software 3-10 years Internet domain name 10 years Licensing agreement Agreement term Intangible assets arising from business combination Licenses and brand name 10 years Mobile applications and software 5 years

DISCONTINUED OPERATIONS (Tables

DISCONTINUED OPERATIONS (Tables)	12 Months Ended
DISCONTINUED OPERATIONS (Tables)	Dec. 31, 2020
DISCONTINUED OPERATIONS
Disposal Groups, Including Discontinued Operations	On February 9, 2018, the Company calculated a gain resulting from such disposition as follows: As of February 9, 2018 RMB Consideration 121,964 Cash and cash equivalents 41,699 Short-term investments 20,000 Prepayments and other receivables 6,428 Property and equipment, net 1,490 Intangible assets, net 45,847 Goodwill 130,613 Long-term investments 2,000 Other non-current assets 14 Accrued payroll and welfare payable (5,104) Accrued expenses and other current liabilities (756) Income tax payable (4,927) Deferred revenue (5,527) Deferred tax liabilities (12,554) Net assets of Qufan 219,223 Equity interest percentage 51 % Less: Net assets of Qufan attributable to the Company 111,804 Gain on disposal of Qufan 10,160
Schedule Of Condensed Cash Flow Statement Of Discontinued Operations	4. DISCONTINUED OPERATIONS (continued) Disposition of Qufan (continued) The condensed cash flows of Qufan were as follows for the year ended December 31, 2018: For the year ended December 31, 2018* RMB Net cash provided by operating activities 839 Effect of foreign exchange on cash (998)
Schedule Of Condensed Income Statement Of Discontinued Operation	The operating results from discontinued operations included in the Group’s consolidated statements of comprehensive loss were as follows for the year ended December 31, 2018: For the years ended December 31, 2018 * RMB Major classes of line items constituting pre-tax profit of discontinued operations Net revenues 7,398 Cost of services (1,885) Sales and marketing (1,938) General and administrative (443) Service development expenses (688) Other income that are not major 77 Income from discontinued operations, before income tax 2,521 Income tax expense (338) Income from discontinued operations, net of income tax 2,183 Gain on deconsolidation of the subsidiary, net of income tax 10,160 Net income from discontinued operations, net of income tax 12,343 * Included financial results of discontinued operations from January 1, 2018 to February 9, 2018.

BUSINESS COMBINATION (Tables)

BUSINESS COMBINATION (Tables)	12 Months Ended
BUSINESS COMBINATION (Tables)	Dec. 31, 2020
BUSINESS COMBINATION
Schedule of acquired intangible assets have weighted average economic lives	Acquired intangible assets have weighted average economic lives from the date of purchase as follows: License 10.0 years Brand name 10.0 years Software 5.0 years
Summary of Redeemable Noncontrolling Interest	5. BUSINESS COMBINATION (continued) Acquisition of The Multi Group (continued) Accordingly, the carrying value of the non-controlling interest as of 2018, 2019 and 2020 is stated as follows: EUR RMB US$ Redeemable noncontrolling interest as of December 31, 2017 2,845 22,052 Total comprehensive loss attributable to non-controlling interest in 2018 (413) (3,223) Adjustment to redemption value in 2018* 1,313 10,559 Redeemable non-controlling interest as of December 31, 2018 3,745 29,388 Adjustment to redemption value in 2019** (1,845) (14,539) — Redeemable non-controlling interest as of December 31, 2019 1,900 14,849 Purchase of 7% redeemable non-controlling interest in 2020 (1,900) (14,849) (2,276) Redeemable non-controlling interest as of December 31, 2020 — — — * Adjustment to redemption value in 2018 including two portions: 1) the excess amount of redemption amount in excess of fair value as of December 31, 2018, 2) the difference between fair value and the carrying amount after ASC 810-10 attribution adjustment. The fair value as of December 31, 2018 was evaluated by third party appraiser on December 31, 2018. The calculation of RMB amount was based on the exchange rate of 1.00 EUR to 7.8473 RMB on December 31, 2018. ** Adjustment to redemption value in 2019 was adjusted according to settlement agreement to purchase the 7% equity interest in TMG held by Helmet at a final redemption price of EUR1,900. The calculation of RMB amount was based on the exchange rate of 1.00 EUR to 7.8155 RMB on December 31, 2019.

INVESTMENTS (Tables)

INVESTMENTS (Tables)	12 Months Ended
INVESTMENTS (Tables)	Dec. 31, 2020
INVESTMENTS
Schedule of long term investments	Long-term Investments As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Carrying amount of equity investments without readily determinable fair value 47,129 44,044 6,750 Carrying amount of equity method investments 105,825 55,928 8,571 Carrying amount of long-term investments 152,954 99,972 15,321 Equity investments - without readily determinable fair value Equity investments - without readily determinable fair value consisted of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Equity investments without readily determinable fair value Private companies 50,603 48,810 7,480 Limited partnerships 22,479 20,342 3,118 Cost of equity investments without readily determinable fair value 73,082 69,152 10,598 Impairment on equity investments without readily determinable fair value (25,953) (25,108) (3,848) Carrying amount of Equity investments without readily determinable fair value 47,129 44,044 6,750 Equity method investments consisted of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Equity Method Investments Private company 9,000 9,000 1,379 Listed company 302,843 283,252 43,410 Limited partnership 14,385 12,380 1,897 Cost of equity method investments 326,228 304,632 46,686 Impairment on equity investment (187,412) (206,522) (31,651) Loss from equity method investment (32,991) (42,182) (6,464) Carrying amount of equity method investments 105,825 55,928 8,571

PREPAYMENTS AND OTHER RECEIVA_2

PREPAYMENTS AND OTHER RECEIVABLES (Tables)	12 Months Ended
PREPAYMENTS AND OTHER RECEIVABLES (Tables)	Dec. 31, 2020
PREPAYMENTS AND OTHER RECEIVABLES
Summary of Prepayments and Other receivables	As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Receivables from third party payment service providers 5,172 2,347 360 Interest receivables 1,255 466 71 Deferred sponsorship and advertising expenses 139 175 27 Prepaid insurance 218 236 36 Deferred expense* 2,332 2,513 385 Receivables for disposal of long-term investments 8,901 8,901 1,364 Deductible value-added input tax 11,602 11,648 1,785 Others 9,052 5,595 858 Less: allowance for doubtful accounts (8,391) (8,901) (1,364) Prepayments and other receivables, net 30,280 22,980 3,522
Schedule of Reconciliation of the Beginning and Ending Allowance for Doubtful Accounts Balance	For the Year Ended For the Year Ended For the Year Ended For the Year Ended December 31, December 31, December 31, December 31, 2018 2019 2020 2020 RMB RMB US$ Beginning balance prior to ASC 326 — — 8,391 1,286 Impact of adoption to ASC 326 — — — — Beginning balance — — 8,391 1,286 Provisions — 20,253 510 78 Write-offs — (11,862) — — Ending balance — 8,391 8,901 1,364 * Deferred expense represents cash paid in advance to vendors, such as consultant expense and compliance expense, which would be amortized according to their respective service periods.

PROPERTY AND EQUIPMENT, NET (Ta

PROPERTY AND EQUIPMENT, NET (Tables)	12 Months Ended
PROPERTY AND EQUIPMENT, NET (Tables)	Dec. 31, 2020
PROPERTY AND EQUIPMENT, NET
Schedule of Property and Equipment	Property and equipment consist of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Electronics and office equipment 45,816 33,353 5,112 Motor vehicles 11,706 10,737 1,646 Leasehold improvements 119,317 118,722 18,195 Property and equipment, cost 176,839 162,812 24,953 Less: Accumulated depreciation (112,727) (143,033) (21,922) Property and equipment, net 64,112 19,779 3,031

INTANGIBLE ASSETS, NET (Tables)

INTANGIBLE ASSETS, NET (Tables)	12 Months Ended
INTANGIBLE ASSETS, NET (Tables)	Dec. 31, 2020
INTANGIBLE ASSETS, NET
Schedule of Intangible Assets	As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Cost: Computer software 27,887 28,424 4,356 License agreement 151,177 151,177 23,169 Internet domain name 1,512 1,512 232 Brand name 86,049 86,049 13,188 266,625 267,162 40,945 Accumulated amortization: Computer software (20,632) (23,154) (3,549) License agreement (37,767) (37,768) (5,788) Internet domain name (724) (837) (128) Brand name (21,152) (21,160) (3,243) (80,275) (82,919) (12,708) Impairment : Computer software (3,547) (3,547) (543) License agreement (113,409) (113,409) (17,381) Brand name (64,889) (64,889) (9,945) (181,845) (181,845) (27,869) Intangible assets, net 4,505 2,398 368 The impairment of RMB181,845 is related to the acquired intangible assets of the Multi Group that were recognized during the year ended December 31, 2019.
Schedule of Estimated Amortization Expense	RMB US$ 2021 1,244 191 2022 388 59 2023 336 51 2024 96 15 2025 85 13 2026 and thereafter 249 39 Total 2,398 368

OPERATING LEASES (Tables)

OPERATING LEASES (Tables)	12 Months Ended
OPERATING LEASES (Tables)	Dec. 31, 2020
OPERATING LEASES
Schedule of operating lease related assets and liabilities	As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Right-of-use assets 36,607 9,327 1,429 Operating lease liabilities - current 16,672 3,710 569 Operating lease liabilities – non-current 31,675 5,807 890 Total operating lease liabilities 48,347 9,517 1,459
Summary of maturity of operating lease liabilities	The following table summarizes the maturity of operating lease liabilities as of December 31, 2020: Operating leases RMB US$ 2021 3,830 587 2022 3,835 588 2023 2,684 411 Thereafter — — Total 10,349 1,586 Less: imputed interest (832) (127) Present value of lease liabilities 9,517 1,459

ACCRUED EXPENSES AND OTHER CU_2

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)	12 Months Ended
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)	Dec. 31, 2020
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
Summary of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consist of the following: As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Advance from end users* 38,663 38,327 5,874 Business tax and other taxes payable 1,136 1,798 276 Professional fees payable 2,878 6,562 1,006 Promotional events payables 2,172 2,077 318 Decoration payables 336 175 27 Others 6,213 7,021 1,076 51,398 55,960 8,577 * Advance from end users represents payments received by the Group in advance from the end users prior to the services to be provided.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
INCOME TAXES (Tables)	Dec. 31, 2020
INCOME TAXES
Schedule of Income (Loss) before Income Taxes	2018 2019 2020 2020 RMB RMB RMB US$ Cayman Islands (166,710) (432,971) (121,723) (18,655) USA (4,058) (4,350) (554) (85) Hong Kong (7,740) (8,166) (4,887) (749) Japan (1,592) (2,523) (542) (83) Malta (7,949) (257) (9,712) (1,488) Curacao (12,752) (22,698) 1,105 169 Cyprus (8) (31) (43) (7) PRC (290,530) (190,932) (88,394) (13,547) (491,339) (661,928) (224,750) (34,445)
Schedule of Current and Deferred Components	2018 2019 2020 2020 RMB RMB RMB US$ Current tax benefit (expense) 19,258 — (4) (1) Deferred tax benefit 344 7,642 3,658 561 Income tax benefit 19,602 7,642 3,654 560
Reconciliation of Tax Computed Applying Statutory Income Tax Rate	2018 2019 2020 2020 RMB RMB RMB US$ Loss before income taxes (491,339) (661,928) (224,750) (34,445) Income tax computed at applicable tax rates (25%) (122,835) (165,482) (56,188) (8,611) Effect of different tax rates in different jurisdictions 979 1,120 2,222 341 Non-deductible expenses 81,459 114,276 19,819 3,037 Change in valuation allowance 45,832 59,338 43,261 6,629 Changes in interest and penalties on unrecognized tax position 1,637 — — — Effect of EIT reversal for previous years (20,726) — (3,598) (551) Research and development super-deduction (5,942) (9,237) (9,110) (1,396) Others (6) (7,657) (60) (9) (19,602) (7,642) (3,654) (560)
Schedule of Unrecognized Tax Benefits Reconciliation	2019 2020 2020 RMB RMB US$ Balance at beginning of year 2,133 1,920 294 Decrease relating to prior year tax positions — (1,920) (294) Decrease relating to expiration of applicable statute of limitations (213) — — Balance at end of year 1,920 — —
Components of Deferred Taxes	2019 2020 2020 RMB RMB US$ Deferred tax assets Advertising costs deductible in future years 63,430 63,391 9,715 Deferred government grants 261 75 11 Loss from equity method investment 1,648 3,271 501 Bad debt provision 7,302 5,577 855 Accrued rental expense 15 63 10 Impairment of long-term investments 4,424 4,350 667 Net operating losses (“NOLs”) 160,271 166,118 25,459 Less: valuation allowance (237,351) (242,845) (37,218) Total deferred tax assets, net — — — Deferred tax liabilities Apps and other licenses arisen from business combination (59) — — Total deferred tax liabilities (59) — —

SHARE-BASED PAYMENT (Tables)

SHARE-BASED PAYMENT (Tables)	12 Months Ended
SHARE-BASED PAYMENT (Tables)	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Share Option Activity and Related Information	Weighted Weighted Weighted average average average grant date remaining Aggregated Number of exercise fair value per contractual intrinsic options price share year value US$ US$ (Years) US$’000 Outstanding, January 1, 2018 41,987,560 1.04 1.18 1.59 3,986 Granted — — — — — Forfeited — — — — — Exercised (6,513,460) 0.92 1.28 — — Outstanding, December 31, 2018 35,474,100 1.07 1.17 0.94 2,078 Granted — — — — — Forfeited (5,900,000) 1.74 0.92 — — Exercised (3,572,880) 0.69 0.97 — 921 Outstanding, December 31, 2019 26,001,220 0.96 1.25 0.71 1,590 Granted — — — — — Forfeited (18,616,300) 3.01 1.32 — Exercised (125,900) 0.20 0.38 — 88 Outstanding, December 31, 2020 7,259,020 0.99 1.09 0.51 907 Vested and expected to vest at December 31, 2020 7,259,020 0.99 1.08 0.52 907 Exercisable at December 31, 2020 7,259,020 0.99 1.08 0.52 907
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	For the years ended December 31, 2018 2019 2020 Expected volatility 54.27%~60.15 % 66.89%~67.67 % 85.73%~97.73 % Risk-free interest rate 2.26%~2.62 % 1.62%~1.95 % 0.11%~0.17 % Dividend yield 0.00 % 0.00 % 0.00 % Forfeiture rate 0.00 % 0.00 % 0.00 % Suboptimal early exercise factor 2.2~2.8 2.2~2.8 2.2~2.8
Schedule of Share-Based Compensation Expenses Relating to Options Granted	For the year ended December 31, 2018 Employees Directors Total Total RMB RMB RMB US$ Cost of services 351 — 351 51 Sales and marketing 11,361 — 11,361 1,652 General and administrative 74,227 2,346 76,573 11,137 Service development expenses 20,343 — 20,343 2,959 106,282 2,346 108,628 15,799 15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors (continued) For the year ended December 31, 2019 Employees Directors Total Total RMB RMB RMB US$ Cost of services 14 — 14 2 Sales and marketing 7,410 — 7,410 1,064 General and administrative 57,666 506 58,172 8,356 Service development expenses 13,679 — 13,679 1,965 78,769 506 79,275 11,387 For the year ended December 31, 2020 Employees Directors Total Total RMB RMB RMB US$ Sales and marketing 4,779 — 4,779 732 General and administrative 31,462 9,331 40,793 6,252 Service development expenses 9,852 — 9,852 1,510 46,093 9,331 55,424 8,494
Restricted shares granted to employees and directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	15. SHARE-BASED PAYMENT (continued) Restricted shares granted to employees and directors Weighted Weighted average average grant date remaining Aggregated Number of fair value per contractual intrinsic options share year value US$ (Years) US$’000 Outstanding, January 1, 2018 12,580,280 0.96 9.63 12,719 Granted 5,000,000 1.41 9.49 3,790 Forfeited — — — — Exercised (10,503,520) 1.05 — 7,962 Outstanding, December 31, 2018 7,076,760 1.15 8.99 5,364 Granted 7,553,980 0.76 9.01 6,496 Forfeited — — — — Exercised (1,224,180) 1.41 — 1,053 Outstanding, December 31, 2019 13,406,560 0.93 8.52 11,530 Granted 17,477,740 0.36 9.61 15,730 Forfeited — — — — Exercised — — — — Outstanding, December 31, 2020 30,884,300 0.62 8.98 27,796 Vested and expected to vest at December 31, 2020 30,884,300 0.62 8.98 27,796 Exercisable at December 31, 2020 30,884,300 0.62 8.98 27,796

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	12 Months Ended
RELATED PARTY TRANSACTIONS (Tables)	Dec. 31, 2020
RELATED PARTY TRANSACTIONS
Schedule of related party transactions	As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ Loto Interactive Information Technology (Shenzhen) Limited* 10,401 368 56 10,401 368 56 * Loto Interactive Information Technology (Shenzhen) Limited ("Loto Interactive Shenzhen") is a subsidiary of Loto Interactive, one of the Company’s equity method investment company. For the year For the year For the year For the year ended ended ended ended December 31, December 31, December 31, December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Interest from loan to Loto Interactive Information Technology (Shenzhen) Limited — 218 137 21 Other operating income from management service provided to Loto Interactive Information Technology (Shenzhen) Limited — 320 217 33 — 538 354 54

LOSSES PER SHARE (Tables)

LOSSES PER SHARE (Tables)	12 Months Ended
LOSSES PER SHARE (Tables)	Dec. 31, 2020
LOSSES PER SHARE
Calculation of Basic and Diluted Earnings Per Share	Basic and diluted losses per share for each of the years presented is calculated as follows: For the years ended December 31, 2018 2019 2020 RMB RMB RMB RMB RMB US$ RMB US$ Class A Class B Class A Class B Class A Class A Class B Class B Losses per share from continuing operations—basic: Numerator: Allocation of net loss from continuing operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating income per ordinary share—basic (380,701) (82,216) (600,774) (50,494) (222,786) (34,144) (440) (67) Denominator: Weighted average number of ordinary shares outstanding used in calculating basic losses per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Denominator used for losses per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Losses per share from continuing operations — basic (1.13) (1.13) (1.52) (1.52) (0.52) (0.08) (0.52) (0.08) Losses per share from continuing operations—diluted: Numerator: Allocation of net loss from continuing operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating loss per ordinary share— diluted (380,701) (82,216) (600,774) (50,494) (222,786) (34,144) (440) (67) Reallocation of net loss from continuing operations attributable to BIT Mining Limited’s ordinary shareholders as a result of conversion of Class B to Class A shares (82,216) — (50,494) — (440) (67) — — Net loss from continuing operations attributable to ordinary shareholders (462,917) (82,216) (651,268) (50,494) (223,226) (34,211) (440) (67) Denominator: Weighted average number of ordinary shares outstanding used in calculating basic losses per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Conversion of Class B to Class A ordinary shares 74,400,299 — 33,229,132 — 847,093 847,093 — — Denominator used for losses per share 418,911,292 74,400,299 428,586,305 33,229,132 430,011,263 430,011,263 847,093 847,093 Losses per share from continuing operations—diluted (1.13) (1.13) (1.52) (1.52) (0.52) (0.08) (0.52) (0.08) Losses from continuing operations per ADS: Denominator used for losses per ADS - basic 34,451,099 — 39,535,717 — 42,916,417 42,916,417 — — Denominator used for losses per ADS - diluted 41,891,129 — 42,858,631 — 43,001,126 43,001,126 — — Losses from continuing operations per ADS – basic (11.28) — (15.20) — (5.19) (0.80) — — Losses from continuing operations per ADS – diluted (11.28) — (15.20) — (5.19) (0.80) — —
Schedule Of Earnings Per Share Basic And Diluted From Discontinued Operations	For the years ended December 31, 2018 2019 2020 RMB RMB RMB RMB RMB US$ RMB US$ Class A Class B Class A Class B Class A Class A Class B Class B Income per share from discontinued operations—basic: Numerator: Allocation of net income from discontinued operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating income per ordinary share—basic 9,247 1,997 — — — — — — Denominator: Weighted average number of ordinary shares outstanding used in calculating basic income per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Denominator used for income per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Income per share from discontinued operations — basic 0.03 0.03 — — — — — — Income per share from discontinued operations—diluted: Numerator: Allocation of net income from discontinued operations attributable to BIT Mining Limited’s ordinary shareholders used in calculating income per ordinary share— diluted 9,247 1,997 — — — — — — Reallocation of net income from discontinued operations attributable to BIT Mining Limited’s ordinary shareholders as a result of conversion of Class B to Class A shares 1,997 — — — — — — — Net income from discontinued operations attributable to ordinary shareholders 11,244 1,997 — — — — — — Denominator: Weighted average number of ordinary shares outstanding used in calculating basic income per share 344,510,993 74,400,299 395,357,173 33,229,132 429,164,170 429,164,170 847,093 847,093 Conversion of Class B to Class A ordinary shares 74,400,299 — 33,229,132 — 847,093 847,093 — — Denominator used for income per share 418,911,292 74,400,299 428,586,305 33,229,132 430,011,263 430,011,263 847,093 847,093 Losses per share from discontinued operations—diluted 0.03 0.03 — — — — — — Income from discontinued operations per ADS: Denominator used for income per ADS - basic 34,451,099 — 39,535,717 — 42,916,417 42,916,417 — — Denominator used for income per ADS - diluted 41,891,129 — 42,858,631 — 43,001,126 43,001,126 — — Income from discontinued operations per ADS – basic 0.27 — — — — — — — Income from discontinued operations per ADS – diluted 0.27 — — — — — — —

FAIR VALUE MEASUREMENT (Tables)

FAIR VALUE MEASUREMENT (Tables)	12 Months Ended
FAIR VALUE MEASUREMENT (Tables)	Dec. 31, 2020
FAIR VALUE MEASUREMENT
Summary of assets measured or disclosed at fair value	Fair value measurement at December 31, 2019 Quoted prices in active Significant Total fair markets for other Significant value at identical observable unobservable December 31, assets inputs inputs 2019 (Level 1) (Level 2) (Level 3) RMB RMB RMB RMB Description Cash equivalents Money market funds 312,635 — 312,635 — Time deposits 23,849 — 23,849 — Total 336,484 — 336,484 — Fair value measurement at December 31, 2020 Quoted prices in active Significant Total fair markets for other Significant value at identical observable unobservable December 31, assets inputs inputs 2020 (Level 1) (Level 2) (Level 3) RMB US$ RMB RMB RMB Description Cash equivalents Money market funds 232,579 35,644 — 232,579 — Total 232,579 35,644 — 232,579 —

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	12 Months Ended
SEGMENT REPORTING (Tables)	Dec. 31, 2020
SEGMENT REPORTING
Schedule of Segment Reporting Information, by Segment	The following table presents summary information by segment for continuing operations for the years ended December 31, 2018, 2019 and 2020, respectively. For the year ended December 31, 2018 PRC Europe Total RMB RMB RMB Net revenues 20,578 105,511 126,089 Depreciation and amortization 31,027 31,511 62,538 Operating loss from continuing operations 327,850 16,638 344,488 Interest income 15,308 — 15,308 Income tax (benefit) expense (21,014) 1,412 (19,602) Segment net loss from continuing operations 453,687 18,050 471,737 Segment assets 1,204,057 42,527 1,246,584 For the year ended December 31, 2019 PRC Europe Total RMB RMB RMB Net revenues 4,092 35,596 39,688 Depreciation and amortization 32,575 28,811 61,386 Operating loss from continuing operations 438,008 204,831 642,839 Interest income 13,448 — 13,448 Income tax benefit (171) (7,471) (7,642) Segment net loss from continuing operations 449,257 205,029 654,286 Segment total assets 674,851 20,928 695,779 For the year ended December 31, 2020 PRC Europe Total Total RMB RMB RMB US$ Net revenues 6,886 14,929 21,815 3,343 Depreciation and amortization 43,810 1,974 45,784 7,016 Operating loss from continuing operations 182,142 8,650 190,792 29,241 Interest income 9,093 — 9,093 1,394 Income tax benefit (3,594) (60) (3,654) (560) Segment net loss from continuing operations 212,506 8,590 221,096 33,885 Segment total assets 457,056 13,417 470,473 72,103

CONDENSED FINANCIAL INFORMATI_2

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Tables)	12 Months Ended
	Dec. 31, 2020
CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY
Schedule of Condensed Balance Sheets	As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ ASSETS Current assets: Cash and cash equivalents 6,116 3,325 510 Other current assets 9,101 8,465 1,297 Amounts due from intergroup companies 515,160 470,077 72,042 Total current assets 530,377 481,867 73,849 Non-current assets: Investment in subsidiaries and VIEs 62,087 (53,317) (8,172) Property and equipment, net 82 — — Total non-current assets 62,169 (53,317) (8,172) TOTAL ASSETS 592,546 428,550 65,677 23. CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (continued) Condensed balance sheets As of As of As of December 31, December 31, December 31, 2019 2020 2020 RMB RMB US$ LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities: Accrued payroll and welfare payable 390 840 129 Accrued expenses and other liabilities 3,139 6,752 1,035 Amounts due to intergroup companies 4,561 17,181 2,633 Total current liabilities 8,090 24,773 3,797 TOTAL LIABILITIES 8,090 24,773 3,797 Shareholders’ equity: Class A ordinary shares, par value US$0.00005 per share, 700,000,000 shares authorized as of December 31, 2019 and 2020; 420,001,792 and 430,127,692 shares issued outstanding 145 151 22 Class B ordinary shares, par value US$0.00005 per share; 300,000,000 shares authorized as of December 31, 2019 and 2020; 10,000,099 and 99 shares issued and outstanding as of December 31, 2019 and 2020, respectively 6 — — Additional paid-in capital 2,547,293 2,602,883 398,909 Treasury shares (143,780) (143,780) (22,035) Accumulated other comprehensive income 141,484 128,441 19,684 Accumulated deficit and statutory reserve (1,960,692) (2,183,918) (334,700) Total shareholder’s equity 584,456 403,777 61,880 TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY 592,546 428,550 65,677
Schedule of Condensed Statements of Comprehensive Income (loss)	For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net revenues — — — — Operating expenses: Sales and marketing (1,784) (57) (30) (5) General and administrative (177,455) (29,437) (57,542) (8,819) Total operating expenses (179,239) (29,494) (57,572) (8,824) Operating loss (179,239) (29,494) (57,572) (8,824) Interest income 2 122 237 36 Equity in loss of subsidiaries and VIEs (272,436) (621,896) (165,891) (25,423) Loss before income tax (451,673) (651,268) (223,226) (34,211) Net loss (451,673) (651,268) (223,226) (34,211) Other comprehensive income Foreign currency translation gain (loss) 21,685 7,734 (11,825) (1,812) Share of other comprehensive loss from an equity method investee — (3,986) (1,218) (187) Comprehensive loss (429,988) (647,520) (236,269) (36,210)
Schedule of Condensed Statements of Cash Flows	For the years ended December 31, 2018 2019 2020 2020 RMB RMB RMB US$ Net cash used in operating activities (91,547) (29,759) (17,685) (2,710) Net cash used in investing activities (56,941) (58,359) (13,028) (1,997) Net cash provided by financing activities 159,456 81,693 28,213 4,324 Effect of exchange rate changes on cash and cash equivalents 66 203 (291) (45) Net increase (decrease) in cash and cash equivalents 11,034 (6,222) (2,791) (428) Cash and cash equivalents at beginning of the year 1,304 12,338 6,116 938 Cash and cash equivalents at end of the year 12,338 6,116 3,325 510

ORGANIZATION (Schedule of Varia

ORGANIZATION (Schedule of Variable Interest Entity) (Details)	12 Months Ended
	Dec. 31, 2020
BVI [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Feb. 9, 2011
Place of establishment	British Virgin Islands
Percentage of ownership by the Company	100.00%
Principal activities	Investment Holding
500wan HK [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Mar. 8, 2011
Place of establishment	Hong Kong
Percentage of ownership by the Company	100.00%
Principal activities	Investment Holding
500.com USA [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jul. 21, 2014
Place of establishment	USA
Percentage of ownership by the Company	100.00%
Principal activities	Investment Holding
E-Sun Sky Computer [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jun. 18, 2007
Place of establishment	PRC
Percentage of ownership by the Company	100.00%
Principal activities	Software Service
E-Sun Network [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Dec. 7, 1999
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Lottery Service
Youlanguang Technology [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Dec. 16, 2008
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Lottery Service
Guangtiandi Technology [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Dec. 16, 2008
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Lottery Service
E-Sun Sky Network [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	May 22, 2006
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Lottery Service
Lhasa Yicai [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Oct. 17, 2014
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Lottery Service
Shenzhen Yicai [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jul. 21, 2015
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Lottery Service
Shenzhen Kaisheng [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jun. 24, 2016
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Online Spot Commodity Trading Services
500.com Nihon Co.,Ltd. [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jul. 27, 2017
Place of establishment	Japan
Percentage of ownership by the Company	100.00%
Principal activities	Investment Holding
The Multi Group Ltd "The Multi Group" or "TMG" [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jun. 26, 2015
Place of establishment	Malta
Percentage of ownership by the Company	100.00%
Principal activities	Investment Holding
Multi Warehouse Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Dec. 3, 2014
Place of establishment	Malta
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Multi Brand Gaming Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Oct. 3, 2014
Place of establishment	Malta
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Multilotto UK Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Sep. 1, 2016
Place of establishment	Malta
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Lotto Warehouse Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Sep. 1, 2016
Place of establishment	Malta
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Wasp Media Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Aug. 12, 2016
Place of establishment	Malta
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Round Spot Services Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	May 6, 2015
Place of establishment	Cyprus
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Multi Pay N.V [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Aug. 25, 2011
Place of establishment	Curacao
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Oddson Europe Ltd [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	Jan. 10, 2018
Place of establishment	Malta
Percentage of ownership by the Company	93.00%
Principal activities	Online Gaming
Hainan Jingli [Member] \| VIE [Member]
Variable Interest Entity And Subsidiaries [Line Items]
Date of establishment	May 3, 2018
Place of establishment	PRC
Percentage of ownership by the Company	0.00%
Principal activities	Software Service

ORGANIZATION (Carrying Amounts

ORGANIZATION (Carrying Amounts of Assets and Liabilities of VIEs) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Current assets:
Cash and cash equivalents	¥ 308,676	$ 47,307	¥ 361,220
Restricted cash	3,829	587	4,576
Amounts due from a related party	368	56	10,401
Prepayments and other current assets, net	22,980	3,522	30,280
Total current assets	335,853	51,472	430,326
Non-current assets:
Property and equipment, net	19,779	3,031	64,112
Intangible assets, net	2,398	368	4,505
Deposits	1,480	227	5,388
Long-term investments	99,972	15,321	152,954
Right-of-use assets	9,327	1,429	36,607
Other non-current assets	1,664	255	1,887
Total non-current assets	134,620	20,631	265,453
TOTAL ASSETS	470,473	72,103	695,779	¥ 1,246,584
Current liabilities:
Accrued payroll and welfare payable	13,401	2,054	6,879
Accrued expenses and other current liabilities	55,960	8,577	51,398
Operating lease liabilities - current	3,710	569	16,672
Income tax payable	549	84	2,213
Total current liabilities	73,620	11,284	77,162
Non-current liabilities:
Long-term payables	526	81	2,965
Operating lease liabilities - non-current	5,807	890	31,675
Total non-current liabilities	6,333	971	34,699
TOTAL LIABILITIES	79,953	12,255	111,861
VIE [Member]
Current assets:
Cash and cash equivalents	194,510	29,810	194,914
Restricted cash	1,242	190	1,539
Time Deposit			100
Amounts due from intergroup companies	936	143	992
Amounts due from a related party	368	56	10,401
Prepayments and other current assets, net	12,781	1,960	14,608
Total current assets	209,837	32,159	222,554
Non-current assets:
Property and equipment, net	15,181	2,327	44,354
Intangible assets, net	1,229	188	1,636
Deposits	424	65	5,117
Long-term investments	35,192	5,393	34,417
Right-of-use assets	9,327	1,429	33,633
Other non-current assets	1,665	255	1,887
Total non-current assets	63,018	9,657	121,044
TOTAL ASSETS	272,855	41,816	343,598
Current liabilities:
Amounts due to intergroup companies	374,379	57,376	367,368
Accrued payroll and welfare payable	12,288	1,883	4,830
Accrued expenses and other current liabilities	36,870	5,651	36,087
Operating lease liabilities - current	3,710	569	13,698
Income tax payable	0		1,525
Total current liabilities	427,247	65,479	423,508
Non-current liabilities:
Long-term payables	526	81	2,965
Operating lease liabilities - non-current	5,807	890	31,675
Total non-current liabilities	6,333	971	34,640
TOTAL LIABILITIES	¥ 433,580	$ 66,450	¥ 458,148

ORGANIZATION (Results of Operat

ORGANIZATION (Results of Operations of VIEs) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Variable Interest Entity [Line Items]
Net revenues for continuing operations	¥ 21,815	$ 3,343	¥ 39,688	¥ 126,089
Net loss for continuing operations	(221,096)	(33,885)	(654,286)	(471,737)
Net income for discontinued operations			0	12,343
VIE [Member]
Variable Interest Entity [Line Items]
Net revenues for continuing operations	6,886	1,055	4,093	20,578
Net revenues for discontinued operations				7,398
Net loss for continuing operations	(60,464)	(9,267)	(135,816)	(103,383)
Net income for discontinued operations				2,183
Net cash used in operating activities	(38,888)	(5,960)	(80,729)	(93,142)
Net cash provided by (used in) investing activities	18,440	2,826	(254)	11,164
Net cash provided by financing activities	¥ 19,747	$ 3,026	¥ 152,701	¥ 104,453

ORGANIZATION (Narrative) (Detai

ORGANIZATION (Narrative) (Details) $ in Millions	12 Months Ended
ORGANIZATION (Narrative) (Details) $ in Millions	Dec. 31, 2020USD ($)shares
E-Sun Sky Network [Member] \| VIE [Member]
Variable Interest Entity, Financial or Other Support, Amount \| $	$ 26,987
Class A Ordinary shares [Member]
Number Of Listed Shares Right To Receive \| shares	10

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Property and Equipment) (Details)	12 Months Ended
	Dec. 31, 2020
Electronics and office equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Residual, Percentage	5.00%
Electronics and office equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Electronics and office equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Motor vehicles [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Estimated Residual, Percentage	2.00%
Motor vehicles [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Estimated Residual, Percentage	5.00%
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, Estimated Useful Life	Shorter of lease term or the estimated useful lives of the assets
Estimated Residual, Percentage	0.00%

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated Useful Lives of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2020
Computer software [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Computer software [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Internet domain name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
License agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
License agreement, Estimated Useful Life	Agreement term
Mobile Applications [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2018USD ($)
Summary Of Accounting Policies [Line Items]
Cash and cash equivalents, maturities	three months or less	three months or less
Time deposits, maturity	greater than three months but less than a year	greater than three months but less than a year
Impairment of goodwill			¥ 129,752	¥ 0
Advertising costs	¥ 0		500	2,400
Other than Temporary Impairment Losses, Investments	33,001	$ 5,058	22,353	149,896
Account Handling Expenses	700	100	2,900	6,800
Server Leasing and Maintenance Expenses	3,200	500	4,200	6,100
Lottery insurance expenses	5,100	800	9,900	20,400
Platform Fee	300	50	6,600	12,100
Regulatory and compliance Fees	1,800	300	1,600	2,000
Amortization of intangible assets	2,202	$ 337	29,369	32,910
Operating lease liabilities	9,517		48,347		$ 1,459
Corresponding right-of-use assets	9,327		36,607		1,429
Retained earnings	¥ (2,183,918)		(1,960,692)		(334,700)
Income Tax Examination, Likelihood of Unfavorable Settlement	tax position if a tax return position or future tax position is “more likely than not” to be sustained upon examination based solely on the technical merits of the position. Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit, determined on a cumulative probability basis, that has a greater than fifty percent likelihood of being realized upon settlement	tax position if a tax return position or future tax position is “more likely than not” to be sustained upon examination based solely on the technical merits of the position. Tax positions that meet the “more likely than not” recognition threshold are measured at the largest amount of tax benefit, determined on a cumulative probability basis, that has a greater than fifty percent likelihood of being realized upon settlement
Cumulative Effect, Period of Adoption, Adjustment [Member] \| ASU 2016-02
Summary Of Accounting Policies [Line Items]
Operating lease liabilities				61,636
Corresponding right-of-use assets				54,275
Retained earnings \| $						$ 0
Cost of Services [Member]
Summary Of Accounting Policies [Line Items]
Amortization of intangible assets	¥ 1,600	$ 200	28,400	31,500
Accrued Expenses and Other Current Liabilities [Member]
Summary Of Accounting Policies [Line Items]
Advance from customers balance	4,734		5,012		$ 726
Deferred revenue	¥ 5,012	$ 768	8,283	4,477
China, Yuan Renminbi
Summary Of Accounting Policies [Line Items]
Currency exchange rate	6.5250				6.5250
United States of America, Dollars
Summary Of Accounting Policies [Line Items]
Currency exchange rate	6.5250				6.5250
Multi Group [Member]
Summary Of Accounting Policies [Line Items]
Impairment of goodwill			129,752
Impairment of intangible assets	¥ 0		¥ 181,845	¥ 0

DISCONTINUED OPERATIONS (Gain R

DISCONTINUED OPERATIONS (Gain Resulting From Such Disposition) (Details) - Qufan [Member] ¥ in Thousands	Feb. 09, 2018CNY (¥)
Consideration	¥ 121,964
Cash and cash equivalents	41,699
Short-term investments	20,000
Prepayments and other receivables	6,428
Property and equipment, net	1,490
Intangible assets, net	45,847
Goodwill	130,613
Long-term investments	2,000
Other non-current assets	14
Accrued payroll and welfare payable	(5,104)
Accrued expenses and other current liabilities	(756)
Income tax payable	(4,927)
Deferred revenue	(5,527)
Deferred tax liabilities	(12,554)
Net assets of Qufan	¥ 219,223
Equity interest percentage	51.00%
Less: Net assets of Qufan attributable to the Company	¥ 111,804
Gain on disposal of Qufan	¥ 10,160

DISCONTINUED OPERATIONS (The Co

DISCONTINUED OPERATIONS (The Condensed Cash Flows Of Qufan) (Details) - Qufan [Member] ¥ in Thousands	12 Months Ended
	Dec. 31, 2018CNY (¥)
Net cash provided by operating activities	¥ 839
Effect of foreign exchange on cash	¥ (998)

DISCONTINUED OPERATIONS (The Op

DISCONTINUED OPERATIONS (The Operating Results From Discontinued Operations) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Major classes of line items constituting pre-tax profit of discontinued operations
Gain on deconsolidation of the subsidiary, net of income tax	¥ 0	¥ 10,160
Net income from discontinued operations, net of income tax	¥ 0	12,343
Qufan [Member]
Major classes of line items constituting pre-tax profit of discontinued operations
Net revenues		7,398
Cost of services		(1,885)
Sales and marketing		(1,938)
General and administrative		(443)
Service development expenses		(688)
Other income that are not major		77
Income from discontinued operations, before income tax		2,521
Income tax expense		(338)
Income from discontinued operations, net of income tax		2,183
Gain on deconsolidation of the subsidiary, net of income tax		10,160
Net income from discontinued operations, net of income tax		¥ 12,343

DISCONTINUED OPERATIONS (Narrat

DISCONTINUED OPERATIONS (Narrative) (Details) - Feb. 09, 2018 - Qufan [Member] ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Disposal Group, Including Discontinued Operation, Consideration	$ 19,431	¥ 121,964
Discontinued Operation Percentage of Equity Interest Disposed	51.00%

BUSINESS COMBINATION (Carrying

BUSINESS COMBINATION (Carrying Value of Noncontrolling Interest) (Details) € in Thousands, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2020EUR (€)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019EUR (€)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018EUR (€)	Dec. 31, 2019EUR (€)	Dec. 31, 2018EUR (€)	Dec. 31, 2017CNY (¥)	Dec. 31, 2017EUR (€)
Total comprehensive loss attributable to noncontrolling interest	¥ 2,130	$ 326		¥ (4,344)		¥ (6,383)
Redeemable non-controlling interest				14,849
Multi Group [Member]
Total comprehensive loss attributable to noncontrolling interest						(3,223)	€ (413)
Adjustment to redemption value				(14,539)	€ (1,845)	10,559	€ 1,313
Purchase of 7% redeemable non-controlling interest in 2020	¥ (14,849)	$ (2,276)	€ (1,900)
Redeemable non-controlling interest				¥ 14,849		¥ 29,388		€ 1,900	€ 3,745	¥ 22,052	€ 2,845

BUSINESS COMBINATION (Schedule

BUSINESS COMBINATION (Schedule of acquired intangible assets have weighted average economic lives) (Details) - Multi Group [Member]	12 Months Ended
	Dec. 31, 2020
License [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average lives	10 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average lives	10 years
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average lives	5 years

BUSINESS COMBINATION (Narrative

BUSINESS COMBINATION (Narrative) (Details) € in Thousands, ¥ in Thousands	Jan. 01, 2019EUR (€)	Jul. 17, 2017EUR (€)	Jul. 17, 2017EUR (€)	Dec. 31, 2020CNY (¥)	Dec. 31, 2020EUR (€)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019EUR (€)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018EUR (€)	Feb. 23, 2021	Apr. 20, 2020EUR (€)
Business Acquisition [Line Items]
Impairment of goodwill \| ¥						¥ 129,752		¥ 0
Redeemable Noncontrolling Interest, Equity, Redemption Value	€ 3,745								€ 3,745
Redeemable Noncontrolling Interest, Equity, Common, Redemption Value											€ 1,900
Percentage of Shares subject to Repurchase	7.00%
Multi Group [Member]
Business Acquisition [Line Items]
Percentage of voting interests acquired		93.00%	93.00%
Discount rate (as a percent)			16.00%			17.50%	17.50%	17.50%	17.50%
Long-term sustainable growth rate (as a percent)			2.00%			2.00%	2.00%	2.00%	2.00%
Impairment of goodwill \| ¥						¥ 129,752
Impairment of intangible assets \| ¥						181,845
Contributed revenues to the Group				¥ 14,929	€ 1,888	¥ 35,596	€ 4,612	¥ 105,511	€ 13,507
Business Combination, Consideration Transferred			€ 49,800
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value									€ 2,504
Noncontrolling Interest, Ownership Percentage by Parent				7.00%	7.00%		7.00%		7.00%	16.60%
Fair Values Assumptions Expected Volatility Rate			3.00%			5.50%	5.50%	5.50%	5.50%
Business Combination, Separately Recognized Transactions, Net Gains and Losses				¥ 8,590	€ 1,086	¥ 23,185	€ 3,004	¥ 18,050	€ 2,311
Foreign Currency Exchange Rate, Translation							7.8155		7.8473
Fair Value Of Non Controlling Interest		€ 2,915
Redeemable Noncontrolling Interest, Equity, Redemption Value							€ 1,900
Redeemable Noncontrolling Interest, Equity, Common, Redemption Value							€ 1,900

INVESTMENTS - (Schedule of Long

INVESTMENTS - (Schedule of Long-term Investments) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
INVESTMENTS
Carrying amount of equity investments without readily determinable fair value	¥ 44,044	$ 6,750	¥ 47,129
Carrying amount of equity method investments	55,928	8,571	105,825
Carrying amount of long-term investments	¥ 99,972	$ 15,321	¥ 152,954

INVESTMENTS (Schedule of Invest

INVESTMENTS (Schedule of Investments Categorized by Investment Class) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)	Dec. 31, 2020USD ($)
Cost method and equity method investments
Impairment loss on equity investment	¥ (33,001)	$ (5,058)	¥ (22,353)	¥ (149,896)
Loss from equity method investments	(10,798)	(1,655)	(10,639)	(15,025)
Carrying amount of equity method investments	55,928		105,825		$ 8,571
Equity investments at fair value without readily determinable fair value Aggregated Cost	69,152		73,082		10,598
Carrying amount of equity investments without readily determinable fair value	44,044		47,129		6,750
Equity Method Investments [Member]
Cost method and equity method investments
Cost of equity method investments	304,632		326,228		46,686
Impairment loss on equity investment	(206,522)	(31,651)	(187,412)
Loss from equity method investments	(42,182)	(6,464)	(32,991)
Carrying amount of equity method investments	55,928		105,825		8,571
Equity Method Investments Fair Value [Member]
Cost method and equity method investments
Equity investments at fair value without readily determinable fair value Aggregated Cost	69,152		73,082		10,598
Impairment on equity investments at fair value without readily determinable fair value	(25,108)	(3,848)	(25,953)
Carrying amount of equity investments without readily determinable fair value	44,044		47,129		6,750
Privately Held Entities [Member] \| Equity Method Investments [Member]
Cost method and equity method investments
Cost of equity method investments	9,000		9,000		1,379
Privately Held Entities [Member] \| Equity Method Investments Fair Value [Member]
Cost method and equity method investments
Equity investments at fair value without readily determinable fair value Aggregated Cost	48,810		50,603		7,480
Limited partnership [Member]
Cost method and equity method investments
Loss from equity method investments	10,798	$ 1,655	10,639	¥ 15,025
Limited partnership [Member] \| Equity Method Investments [Member]
Cost method and equity method investments
Cost of equity method investments	12,380		14,385		1,897
Limited partnership [Member] \| Equity Method Investments Fair Value [Member]
Cost method and equity method investments
Equity investments at fair value without readily determinable fair value Aggregated Cost	20,342		22,479		3,118
Listed Company [Member] \| Equity Method Investments [Member]
Cost method and equity method investments
Cost of equity method investments	¥ 283,252		¥ 302,843		$ 43,410

INVESTMENTS (Narrative) (Detail

INVESTMENTS (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands, $ in Millions	Jun. 06, 2017USD ($)shares	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)	Dec. 31, 2020USD ($)	Jun. 30, 2018USD ($)	May 31, 2018CNY (¥)	Feb. 28, 2018USD ($)	Dec. 31, 2017USD ($)	Jun. 06, 2017HKD ($)$ / shares	Mar. 31, 2017USD ($)	Feb. 28, 2017	Dec. 31, 2016USD ($)	Nov. 30, 2016USD ($)	Jun. 30, 2016CNY (¥)	Dec. 31, 2015USD ($)	Aug. 31, 2015CNY (¥)	Aug. 31, 2015USD ($)	Jun. 30, 2015CNY (¥)	Apr. 30, 2015	Mar. 31, 2015USD ($)	Jun. 30, 2014USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount		¥ 44,044		¥ 47,129		$ 6,750
Equity Method Investments		55,928		105,825		8,571
Equity Method Investment, Other than Temporary Impairment		33,001	$ 5,058	22,353	¥ 149,896
Loss from equity method investments		(10,798)	(1,655)	(10,639)	(15,025)
Share of other comprehensive loss of an equity method investee		(1,218)	(187)	(3,986)	0
Equity investments at fair value without readily determinable fair value Aggregated Cost		69,152		73,082		10,598
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount		25,108		25,953		$ 3,848
Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Loss from equity method investments		10,798	1,655	10,639	15,025
Limited partnership [Member] \| Guangda Sports Culture [Member]
Debt and Equity Securities, FV-NI [Line Items]
Limited partnership interest percentage										12.20%											9.90%
Equity Method Investments \| $																	$ 20,000
Loss from equity method investments		(3,246)	(497)	2,225	¥ 2,833
Hzone Holding Company [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount				12,400
Hzone Holding Company [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost \| $																						$ 2,000
Percentage of Equity Securities Without Readily Determinable Fair Value																						10.00%
Topgame Global Limited [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount				9,463
Topgame Global Limited [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost \| $																			$ 1,373
Percentage of Equity Securities Without Readily Determinable Fair Value																		1.29%	1.29%
Caicaihudong (Beijing) Technology Co., Ltd [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount				13
Caicaihudong (Beijing) Technology Co., Ltd [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost																		¥ 13
Percentage of Equity Securities Without Readily Determinable Fair Value																		1.29%	1.29%
Youwang Technology (Shanghai) Co., Ltd. [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount				¥ 477
Youwang Technology (Shanghai) Co., Ltd. [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost																		¥ 477
Danhua [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Return of Principal \| $			$ 123
Danhua [Member] \| Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost \| $																							$ 1,000
Percentage of Equity Securities Without Readily Determinable Fair Value																							1.10%
Beijing Weisaishidai Sports Technology Co., Ltd [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amount of original cost of cost method investments																¥ 10,000
Beijing Weisaishidai Sports Technology Co., Ltd [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Percentage of Equity Securities Without Readily Determinable Fair Value					0.83%
Percentage of Equity Securities Original Cost Without Readily Determinable Fair Value																0.84%
Techelix Co., Ltd [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amount of original cost of cost method investments \| $															$ 600
Techelix Co., Ltd [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amount of original cost of cost method investments \| $									$ 300
Equity Securities without Readily Determinable Fair Value, Amount \| $							$ 50
Percentage of Equity Securities Without Readily Determinable Fair Value				1.65%	1.98%										2.00%
Beijing Heimatuoxin Venture Capital LP [Member] \| Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost																				¥ 3,000
Percentage of Equity Securities Without Readily Determinable Fair Value																				3.49%
Dividend Income, Equity Securities, Operating		679
Return of Principal		¥ 858
Extended period for partnership agreement		2 years	2 years
zPark [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Return of Principal \| $			$ 23
zPark [Member] \| Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost \| $														$ 1,000
Percentage of Equity Securities Without Readily Determinable Fair Value		1.64%				1.64%								2.00%
Dividend Income, Equity Securities, Operating \| $			71
Cheerful Interactive Limited [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount \| $												$ 1,250
Cheerful Interactive Limited [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Percentage of Equity Securities Without Readily Determinable Fair Value					3.92%							5.00%
Loto Interactive Limited [Member]
Debt and Equity Securities, FV-NI [Line Items]
Percentage of Equity Securities Without Readily Determinable Fair Value		33.74%		40.48%		33.74%
Loto Interactive Limited [Member] \| Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Method Investment, Other than Temporary Impairment		¥ 33,001	5,058	¥ 0	¥ 149,896
Loto Interactive Limited [Member] \| Listed Company [Member]
Debt and Equity Securities, FV-NI [Line Items]
Limited partnership interest percentage	40.65%										40.65%
Equity Method Investments	$ 41,300										$ 322.2
Shares Issued, Price Per Share \| $ / shares											$ 0.252
Loto Interactive Limited [Member] \| Listed Company [Member] \| The Sale Shares [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Method Investment, Shares Acquired \| shares	1,278,714,329
Loto Interactive Limited [Member] \| Publicly listed company [Member]
Debt and Equity Securities, FV-NI [Line Items]
Loss from equity method investments		14,502	2,223	16,423	12,233
Share of other comprehensive loss of an equity method investee		1,218	187	3,986	0
Sparkland Venture Capital Growth Fund L.P [Member]
Debt and Equity Securities, FV-NI [Line Items]
Loss from equity method investments		426	65	(321)	323
Sparkland Venture Capital Growth Fund L.P [Member] \| Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Limited partnership interest percentage										15.38%			6.67%
Equity Method Investments \| $										$ 1,000
Shenzhen Jinyingzaixian Technology Service Limited [Member] \| Privately Held Entities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount								¥ 9,000
Limited partnership interest percentage								45.00%
Loss on Sale of Investments		5,306	$ 813	¥ (106)	¥ (5,948)
Jingyan [Member] \| Limited partnership [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity investments at fair value without readily determinable fair value Aggregated Cost																¥ 6,000
Percentage of Equity Securities Without Readily Determinable Fair Value					4.31%											4.64%
Dividend Income, Equity Securities, Operating		874
Return of Principal		¥ 60

PREPAYMENTS AND OTHER RECEIVA_3

PREPAYMENTS AND OTHER RECEIVABLES (Summary of Prepayments and Other Current Assets) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2020USD ($)
PREPAYMENTS AND OTHER RECEIVABLES
Receivables from third party payment service providers	¥ 2,347		¥ 5,172	$ 360
Interest receivables	466		1,255	71
Deferred sponsorship and advertising expenses	175		139	27
Prepaid insurance	236		218	36
Deferred expense	2,513		2,332	385
Receivables for disposal of long-term investments	8,901		8,901	1,364
Deductible value-added input tax	11,648		11,602	1,785
Others	5,595		9,052	858
Less: allowance for doubtful accounts	(8,901)	$ (1,364)	(8,391)
Prepayments and other receivables, net	¥ 22,980		¥ 30,280	$ 3,522

PREPAYMENTS AND OTHER RECEIVA_4

PREPAYMENTS AND OTHER RECEIVABLES (Summary of Reconciliation of Beginning and Ending Allowance For Doubtful Accounts (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2017CNY (¥)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	¥ 8,391	$ 1,286	¥ 0	¥ 0
Write-offs	0	0	(11,862)	0
Provisions	510	78	20,253	0
Ending balance	8,901	1,364	8,391	0
ASU 2019-04
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	¥ 8,391	$ 1,286	0	0
Impact of Adoption to ASC 326			0	0	$ 0	¥ 0
Ending balance			¥ 8,391	¥ 0

PROPERTY AND EQUIPMENT, NET (Sc

PROPERTY AND EQUIPMENT, NET (Schedule of Property and Equipment) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Property, Plant and Equipment [Line Items]
Property and equipment, cost	¥ 162,812	$ 24,953	¥ 176,839
Less: Accumulated depreciation	(143,033)	(21,922)	(112,727)
Property and equipment, net	19,779	3,031	64,112
Electronics and office equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, cost	33,353	5,112	45,816
Motor vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, cost	10,737	1,646	11,706
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, cost	¥ 118,722	$ 18,195	¥ 119,317

PROPERTY AND EQUIPMENT, NET (Na

PROPERTY AND EQUIPMENT, NET (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
PROPERTY AND EQUIPMENT, NET
Depreciation expense of Continuing Operations	¥ 43,582	$ 6,679	¥ 32,017	¥ 31,027
Depreciation expense of discontinued Operations	¥ 0		¥ 0	¥ 42

INTANGIBLE ASSETS, NET (Schedul

INTANGIBLE ASSETS, NET (Schedule of Intangible Assets) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)
Finite-Lived Intangible Assets [Line Items]
Cost	¥ 266,625		¥ 267,162	$ 40,945
Accumulated amortization	(80,275)		(82,919)	(12,708)
Impairment of intangible assets	(181,845)		(181,845)	(27,869)
Intangible assets, net	4,505		2,398	368
Impairment of intangible assets	(181,845)	¥ 0
Computer software [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	27,887		28,424	4,356
Accumulated amortization	(20,632)		(23,154)	(3,549)
Impairment of intangible assets	(3,547)		(3,547)	(543)
License agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	151,177		151,177	23,169
Accumulated amortization	(37,767)		(37,768)	(5,788)
Impairment of intangible assets	(113,409)		(113,409)	(17,381)
Internet domain name [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,512		1,512	232
Accumulated amortization	(724)		(837)	(128)
Brand name [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	86,049		86,049	13,188
Accumulated amortization	(21,152)		(21,160)	(3,243)
Impairment of intangible assets	¥ (64,889)		¥ (64,889)	$ (9,945)

INTANGIBLE ASSETS, NET (Sched_2

INTANGIBLE ASSETS, NET (Schedule of Estimated Amortization Expense) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
INTANGIBLE ASSETS, NET
2021	¥ 1,244	$ 191
2022	388	59
2023	336	51
2024	96	15
2025	85	13
2026 and thereafter	249	39
Intangible assets, net	¥ 2,398	$ 368	¥ 4,505

INTANGIBLE ASSETS, NET (Narrati

INTANGIBLE ASSETS, NET (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
INTANGIBLE ASSETS, NET
Impairment			¥ 181,845	¥ 0
Amortization Expense Continuing Operations	¥ 2,202	$ 337	29,369	31,511
Amortization Expense Discontinued Operations	¥ 0		¥ 0	¥ 1,399

OPERATING LEASES (Operating lea

OPERATING LEASES (Operating lease related assets and liabilities) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
OPERATING LEASES
Right-of-use assets	¥ 9,327	$ 1,429	¥ 36,607
Operating lease liabilities - current	3,710	569	16,672
Operating lease liabilities - non-current	5,807	890	31,675
Total operating lease liabilities	¥ 9,517	$ 1,459	¥ 48,347

OPERATING LEASES (Summary of ma

OPERATING LEASES (Summary of maturity of operating leases liabilities) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Future lease payments under operating leases
2021	¥ 3,830	$ 587
2022	3,835	588
2023	2,684	411
Thereafter	0	0
Total	10,349	1,586
Less: imputed interest	(832)	(127)
Total operating lease liabilities	¥ 9,517	$ 1,459	¥ 48,347

OPERATING LEASES (Narratives) (

OPERATING LEASES (Narratives) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)
Lessee, Lease, Description [Line Items]
Lease termination gain	¥ (11,740)	$ (1,799)
Weighted average remaining lease term	2 years 8 months 1 day	2 years 8 months 1 day
Weighted average discount rate	6.175%	6.175%
Operating lease expenses					¥ 35,144
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease costs	¥ 7,580	$ 1,161	¥ 20,530	$ 2,949
Short term lease costs	3,142	482	8,627	$ 1,239
Cash paid amounts included in measurement of operating lease liabilities	¥ 7,386	$ 1,132	¥ 17,175
Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	7 days	7 days
Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term	2 years 8 months 1 day	2 years 8 months 1 day

ACCRUED EXPENSES AND OTHER CU_3

ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
Advance from end users	¥ 38,327	$ 5,874	¥ 38,663
Business tax and other taxes payable	1,798	276	1,136
Professional fees payable	6,562	1,006	2,878
Promotional events payables	2,077	318	2,172
Decoration payables	175	27	336
Others	7,021	1,076	6,213
Accrued expenses and other current liabilities, Total	¥ 55,960	$ 8,577	¥ 51,398

STATUTORY RESERVE AND RESTRIC_2

STATUTORY RESERVE AND RESTRICTED NET ASSETS (Details) - 12 months ended Dec. 31, 2020 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Variable Interest Entity [Line Items]
Percentage of after tax profits to be allocated to general reserve fund	10.00%
VIE [Member]
Variable Interest Entity [Line Items]
Percentage of after tax profits to be allocated to general reserve fund	10.00%
Percentage of registered capital	50.00%
PRC Subsidiary and VIEs restricted amount	¥ 241,884	$ 37,070
E-Sun Sky Computer [Member]
Variable Interest Entity [Line Items]
Percentage of after tax profits to be allocated to general reserve fund	10.00%
Percentage of registered capital	50.00%

INCOME TAXES (Narrative Summary

INCOME TAXES (Narrative Summary of Tax Rates) (Details)	12 Months Ended
INCOME TAXES (Narrative Summary of Tax Rates) (Details)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Youlanguang Technology [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	25.00%	25.00%	25.00%
E-Sun Sky Network [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	25.00%	25.00%	25.00%
E-Sun Sky Computer [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	25.00%	25.00%	25.00%
ESun Network [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	25.00%	25.00%	25.00%
Shenzhen Yicai [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	25.00%	25.00%	25.00%
Shenzhen Kaisheng [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	25.00%	25.00%	25.00%
VIE [Member] \| High-tech Enterprise [Member] \| Shangmeng Services [Member]
Income Tax Contingency [Line Items]
Transitional income tax rate period	3 years
Hong Kong
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	16.50%
PRC \| VIE [Member] \| Youlanguang Technology [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income			25.00%
PRC \| VIE [Member] \| Lhasa Yicai [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	15.00%	15.00%	15.00%
PRC \| VIE [Member] \| High-tech Enterprise [Member] \| E-Sun Sky Computer [Member]
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income				15.00%
Malta
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	35.00%
Effective Income Tax Rate Reconciliation, Percent	5.00%
Curacao
Income Tax Contingency [Line Items]
Statutory EIT rate on taxable income	2.00%

INCOME TAXES (Schedule of Incom

INCOME TAXES (Schedule of Income (Loss) before Income Taxes) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Segment Reporting Information [Line Items]
Loss before income taxes	¥ (224,750)	$ (34,445)	¥ (661,928)	¥ (491,339)
Cayman Islands
Segment Reporting Information [Line Items]
Loss before income taxes	(121,723)	(18,655)	(432,971)	(166,710)
USA
Segment Reporting Information [Line Items]
Loss before income taxes	(554)	(85)	(4,350)	(4,058)
Hong Kong
Segment Reporting Information [Line Items]
Loss before income taxes	(4,887)	(749)	(8,166)	(7,740)
Japan
Segment Reporting Information [Line Items]
Loss before income taxes	(542)	(83)	(2,523)	(1,592)
Malta
Segment Reporting Information [Line Items]
Loss before income taxes	(9,712)	(1,488)	(257)	(7,949)
Curacao
Segment Reporting Information [Line Items]
Loss before income taxes	1,105	169	(22,698)	(12,752)
Cyprus
Segment Reporting Information [Line Items]
Loss before income taxes	(43)	(7)	(31)	(8)
PRC
Segment Reporting Information [Line Items]
Loss before income taxes	¥ (88,394)	$ (13,547)	¥ (190,932)	¥ (290,530)

INCOME TAXES (Schedule of Curre

INCOME TAXES (Schedule of Current and Deferred Components) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
INCOME TAXES
Current tax benefit (expense)	¥ (4)	$ (1)		¥ 19,258
Deferred tax benefit	3,658	561	¥ 7,642	344
Income tax benefit	¥ 3,654	$ 560	¥ 7,642	¥ 19,602

INCOME TAXES (Reconciliation of

INCOME TAXES (Reconciliation of Tax Computed Applying Statutory Income Tax Rate) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
INCOME TAXES
Loss before income taxes	¥ (224,750)	$ (34,445)	¥ (661,928)	¥ (491,339)
Income tax computed at applicable tax rates (25%)	(56,188)	(8,611)	(165,482)	(122,835)
Effect of different tax rates in different jurisdictions	2,222	341	1,120	979
Non-deductible expenses	19,819	3,037	114,276	81,459
Change in valuation allowance	43,261	6,629	59,338	45,832
Changes in interest and penalties on unrecognized tax position	0	0	0	1,637
Effect of EIT reversal for previous years	(3,598)	(551)	0	(20,726)
Research and development super-deduction	(9,110)	(1,396)	(9,237)	(5,942)
Others	(60)	(9)	(7,657)	(6)
Income tax expense (benefit)	¥ (3,654)	$ (560)	¥ (7,642)	¥ (19,602)

INCOME TAXES (Schedule of Unrec

INCOME TAXES (Schedule of Unrecognized Tax Benefits Reconciliation) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
INCOME TAXES
Balance at beginning of year	¥ 1,920	$ 294	¥ 2,133
Decrease relating to prior year tax positions	(1,920)	(294)	0
Decrease relating to expiration of applicable statute of limitations	0	0	(213)
Balance at end of year	¥ 0	$ 0	¥ 1,920

INCOME TAXES (Components of Def

INCOME TAXES (Components of Deferred Taxes) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Deferred tax assets
Advertising costs deductible in future years	¥ 63,391	$ 9,715	¥ 63,430
Deferred government grants	75	11	261
Loss from equity method investment	3,271	501	1,648
Bad debt provision	5,577	855	7,302
Accrued rental expense	63	10	15
Impairment of long-term investments	4,350	667	4,424
Net operating losses ("NOLs")	166,118	25,459	160,271
Less: valuation allowance	(242,845)	(37,218)	(237,351)
Total deferred tax assets, net	0	0	0
Deferred tax liabilities
Apps and other licenses arisen from business combination	0	0	(59)
Total deferred tax liabilities	¥ 0	$ 0	¥ (59)

INCOME TAXES (Narrative) (Detai

INCOME TAXES (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Income Tax Contingency [Line Items]
Unrecognized tax benefits reversed	¥ 0		¥ 0	¥ 7,420
Statute of limitation period	In general, the PRC tax authorities have up to three to five years to conduct examinations of the Group’s tax filings.
Cumulative temporary differences of investments in foreign subsidiaries	¥ 0		0
Unrecognized deferred tax liabilities	¥ 0		¥ 0
Entitlement Of Income Tax Refund, Description	the paying entity is entitled to claim 6/7 of the profit tax paid as refund
Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Year open for examination	2016
Net operating losses expiration year	2021
Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Year open for examination	2020
Net operating losses expiration year	2025
VIE [Member]
Income Tax Contingency [Line Items]
Net operating losses	¥ 492,220	$ 75,436
Multi Group [Member]
Income Tax Contingency [Line Items]
Net operating losses	¥ 31,636	$ 4,848

EMPLOYEE DEFINED CONTRIBUTION_2

EMPLOYEE DEFINED CONTRIBUTION PLAN (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
EMPLOYEE DEFINED CONTRIBUTION PLAN
Amount of employee benefits expensed	¥ 4,197	$ 643	¥ 11,770	¥ 12,682

SHARE-BASED PAYMENT (Summary of

SHARE-BASED PAYMENT (Summary of Share Option Activity and Related Information) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)shares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2018CNY (¥)shares	Dec. 31, 2017USD ($)$ / sharesshares
Number of option
Exercised \| shares	(125,900)	(125,900)	(3,572,880)	(3,572,880)	(6,513,460)	(6,513,460)
Restricted shares granted to employees and directors [Member]
Number of option
Outstanding, January 1 \| shares	13,406,560	13,406,560	7,076,760	7,076,760	12,580,280	12,580,280
Granted \| shares	17,477,740	17,477,740	7,553,980	7,553,980	5,000,000	5,000,000
Forfeited \| shares	0	0	0	0	0	0
Exercised \| shares	0	0	(1,224,180)	(1,224,180)	(10,503,520)	(10,503,520)
Outstanding, December 31 \| shares	30,884,300	30,884,300	13,406,560	13,406,560	7,076,760	7,076,760	12,580,280
Vested and expected to vest at December 31 \| shares	30,884,300
Exercisable at December 31, \| shares	30,884,300
Weighted average grant date fair value per share
Outstanding, January 1	$ 0.93		$ 1.15		$ 0.96
Granted	0.36		0.76		1.41
Forfeited	0		0		0
Exercised	0		1.41		1.05
Outstanding, December 31	0.62		$ 0.93		$ 1.15		$ 0.96
Vested and expected to vest at December 31	0.62
Exercisable at December 31	$ 0.62
Weighted average remaining contractual year
Outstanding	8 years 11 months 23 days	8 years 11 months 23 days	8 years 6 months 7 days	8 years 6 months 7 days	8 years 11 months 26 days	8 years 11 months 26 days	9 years 7 months 17 days
Granted	9 years 7 months 9 days	9 years 7 months 9 days	9 years 3 days	9 years 3 days	9 years 5 months 26 days	9 years 5 months 26 days
Forfeited	0 years	0 years
Exercised	0 years	0 years
Vested and expected to vest at December 31	8 years 11 months 23 days	8 years 11 months 23 days
Exercisable at December 31	8 years 11 months 23 days	8 years 11 months 23 days
Aggregated intrinsic value
Outstanding, January 1 \| $	$ 11,530		$ 5,364		$ 12,719
Granted \| $	15,730		6,496		3,790
Forfeited \| $	0		0		0
Exercised \| $	0		1,053		7,962
Outstanding, December 31 \| $	27,796		$ 11,530		$ 5,364		$ 12,719
Vested and expected to vest at December 31 \| $	27,796
Exercisable at December 31 \| $	$ 27,796
Employees and Directors [Member]
Number of option
Outstanding, January 1 \| shares	26,001,220	26,001,220	35,474,100	35,474,100	41,987,560	41,987,560
Granted \| shares	0	0	0	0	0	0
Forfeited \| shares	(18,616,300)	(18,616,300)	(5,900,000)	(5,900,000)	0	0
Exercised \| shares	(125,900)	(125,900)	(3,572,880)	(3,572,880)	(6,513,460)	(6,513,460)
Outstanding, December 31 \| shares	7,259,020	7,259,020	26,001,220	26,001,220	35,474,100	35,474,100	41,987,560
Vested and expected to vest at December 31 \| shares	7,259,020
Exercisable at December 31, \| shares	7,259,020
Weighted average exercise price
Outstanding, January 1	$ 0.96		$ 1.07		$ 1.04
Granted	0		0		0
Forfeited	3.01		1.74		0
Exercised	0.20		0.69		0.92
Outstanding, December 31	0.99		0.96		1.07		$ 1.04
Vested and expected to vest at December 31	0.99
Exercisable at December 31	0.99
Weighted average grant date fair value per share
Outstanding, January 1	1.25		1.17		1.18
Granted	0		0		0
Forfeited	1.32		0.92		0
Exercised	0.38		0.97		1.28
Outstanding, December 31	1.09		$ 1.25		$ 1.17		$ 1.18
Vested and expected to vest at December 31	1.08
Exercisable at December 31	$ 1.08
Weighted average remaining contractual year
Outstanding	6 months 3 days	6 months 3 days	8 months 15 days	8 months 15 days	11 months 8 days	11 months 8 days	1 year 7 months 2 days
Vested and expected to vest at December 31	6 months 7 days	6 months 7 days
Exercisable at December 31	6 months 7 days	6 months 7 days
Aggregated intrinsic value
Outstanding, January 1 \| $	$ 1,590		$ 2,078		$ 3,986
Granted \| $	0		0
Forfeited \| $			0		0
Exercised	88	¥ 575	921	¥ 6,415	0	¥ 2,284
Outstanding, December 31 \| $	907		$ 1,590		$ 2,078		$ 3,986
Vested and expected to vest at December 31 \| $	907
Exercisable at December 31 \| $	$ 907

SHARE-BASED PAYMENT (Schedule o

SHARE-BASED PAYMENT (Schedule of Assumptions Used to Estimate Fair Value of Share Options Granted) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	85.73%	66.89%	54.27%
Expected volatility, maximum	97.73%	67.67%	60.15%
Risk-free interest rate, minimum	0.11%	1.62%	2.26%
Risk-free interest rate, maximum	0.17%	1.95%	2.62%
Dividend yield	0.00%	0.00%	0.00%
Forfeiture rate	0.00%	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal early exercise factor	$ 2.2	$ 2.2	$ 2.2
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Suboptimal early exercise factor	$ 2.8	$ 2.8	$ 2.8

SHARE-BASED PAYMENT (Schedule_2

SHARE-BASED PAYMENT (Schedule of Share-Based Compensation Expenses Relating to Options Granted) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	¥ 55,424	$ 8,494	¥ 79,275	$ 11,387	¥ 108,628	$ 15,799
Cost of Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses			14	2	351	51
Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	4,779	732	7,410	1,064	11,361	1,652
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	40,793	6,252	58,172	8,356	76,573	11,137
Service development expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	9,852	$ 1,510	13,679	$ 1,965	20,343	$ 2,959
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	46,093		78,769		106,282
Employees [Member] \| Cost of Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses			14		351
Employees [Member] \| Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	4,779		7,410		11,361
Employees [Member] \| General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	31,462		57,666		74,227
Employees [Member] \| Service development expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	9,852		13,679		20,343
Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	9,331		506		2,346
Directors [Member] \| Cost of Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses			0		0
Directors [Member] \| Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	0		0		0
Directors [Member] \| General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	9,331		506		2,346
Directors [Member] \| Service development expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	¥ 0		¥ 0		¥ 0

SHARE-BASED PAYMENT (Narrative)

SHARE-BASED PAYMENT (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	Dec. 21, 2020shares	Nov. 22, 2020USD ($)shares	Jul. 01, 2020shares	Jun. 29, 2020USD ($)shares	Jun. 26, 2020shares	Jun. 19, 2020USD ($)shares	Nov. 22, 2019USD ($)shares	Jun. 29, 2019USD ($)shares	Jun. 19, 2019USD ($)shares	Jan. 02, 2019shares	Sep. 01, 2018shares	Jun. 28, 2018shares	Jun. 19, 2018USD ($)shares	May 01, 2018USD ($)shares	May 01, 2018USD ($)shares	Mar. 28, 2011	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)shares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2018CNY (¥)shares	Dec. 31, 2020CNY (¥)shares	Dec. 01, 2020shares	Mar. 01, 2019shares	Dec. 31, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of issued and outstanding ordinary shares authorized for issuance under plan																12.00%
Incremental compensation cost \| $								$ 7	$ 2,710
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number								133,200	12,301,430				7,594,240		66,600
Sharebased Compensation Arrangement by Sharebased Payment Award Equity Instruments Other than Options Grants in Period Fair Value																	$ 6,318	¥ 41,225		¥ 40,023		¥ 48,575
Share options granted on June 19, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost \| $		$ 5				$ 291	$ 59							$ 32			$ 208
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number		233,350				6,214,920	233,350							233,350			3,773,050	3,773,050
Reduction in incremental cost \| $																	$ 83
Share options granted on January 6, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost \| $		$ 3					$ 50							$ 18
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number		500,000					600,000							600,000
Share options granted on December 16, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost \| $		$ 7					$ 94
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number		600,000					600,000
Share options granted on June 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost \| $				$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number				200,000
Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during period																	0	0	0	0	0	0
Exercise price of share \| $ / shares																	$ 0		$ 0		$ 0
Number of shares options vested																	7,259,020						7,259,020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period																	18,616,300	18,616,300	5,900,000	5,900,000	0	0
Intrinsic value of options exercised																	$ 88	¥ 575	$ 921	¥ 6,415	$ 0	¥ 2,284
Number of vested and non vested options																	7,259,020		26,001,220	26,001,220	35,474,100	35,474,100	7,259,020			41,987,560
Weighted-average grant-date fair value per share granted \| $ / shares																	$ 0		$ 0		$ 0
Restricted shares granted to employees and directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during period																	17,477,740	17,477,740	7,553,980	7,553,980	5,000,000	5,000,000
Number of shares options vested																	30,884,300						30,884,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period																	0	0	0	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	4,500,000				12,977,740					7,553,980		5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			6,488,870								2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number																								6,488,870	3,000,000
Intrinsic value of options exercised \| $																	$ 0		$ 1,053		$ 7,962
Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Exercises Aggregate Intrinsic Value \| ¥																		¥ 0		¥ 7,331		¥ 54,740
Number of vested and non vested options																	30,884,300		13,406,560	13,406,560	7,076,760	7,076,760	30,884,300			12,580,280
Weighted-average grant-date fair value per share granted \| $ / shares																	$ 0.36		$ 0.76		$ 1.41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares																	$ 0.62		$ 0.76		$ 1.41
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost \| $													$ 4,764		$ 6
Equity awards granted to employees recognition period																	6 months 29 days	6 months 29 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options																	$ 68						¥ 441

RELATED PARTY TRANSACTIONS (Amo

RELATED PARTY TRANSACTIONS (Amount due from Related Party) (Details) ¥ in Thousands, $ in Thousands		Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
RELATED PARTY TRANSACTIONS
Amounts due from a related party		¥ 368	$ 56	¥ 10,401
Loto Interactive Information Technology (Shenzhen) Limited [Member]
RELATED PARTY TRANSACTIONS
Amounts due from a related party	[1]	¥ 368	$ 56	¥ 10,401

[1]	Loto Interactive Information Technology (Shenzhen) Limited ("Loto Interactive Shenzhen") is a subsidiary of Loto Interactive, one of the Company’s equity method investment company.

RELATED PARTY TRANSACTIONS (Nar

RELATED PARTY TRANSACTIONS (Narrative) (Details) ¥ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
RELATED PARTY TRANSACTIONS
Amounts due from a related party		¥ 368	$ 56	¥ 10,401
Loto Interactive Information Technology (Shenzhen) Limited [Member]
RELATED PARTY TRANSACTIONS
Amounts due from a related party	[1]	¥ 368	$ 56	¥ 10,401
Loto Interactive Shenzhen [Member] \| Interest on loans [Member]
RELATED PARTY TRANSACTIONS
Transaction rate		4.35%

[1]	Loto Interactive Information Technology (Shenzhen) Limited ("Loto Interactive Shenzhen") is a subsidiary of Loto Interactive, one of the Company’s equity method investment company.

RELATED PARTY TRANSACTIONS (Rel

RELATED PARTY TRANSACTIONS (Related Party transactions) (Details) - Loto Interactive Information Technology (Shenzhen) Limited [Member] ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
RELATED PARTY TRANSACTIONS
Amount	¥ 354	$ 54	¥ 538	¥ 0
Expense paid amount	111	17
Interest on loans [Member]
RELATED PARTY TRANSACTIONS
Amount	137	21	218	0
Service management [Member]
RELATED PARTY TRANSACTIONS
Amount	¥ 217	$ 33	¥ 320	¥ 0

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
COMMITMENTS AND CONTINGENCIES
Accrual for unrecognized tax benefits	¥ 0	¥ 1,920
Indemnity cost	¥ 0	¥ 0	¥ 0

LOSSES PER SHARE (Details)

LOSSES PER SHARE (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)¥ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)¥ / sharesshares	Dec. 31, 2018CNY (¥)¥ / sharesshares
Denominator:
Denominator used for losses per share	430,011,263	430,011,263	428,586,305	418,911,292
Numerator:
Net loss from continuing operations attributable to ordinary shareholders	¥ (221,096)	$ (33,885)	¥ (654,286)	¥ (471,737)
Denominator:
Weighted average number of ordinary shares outstanding used in calculating basic losses per share	430,011,263	430,011,263	428,586,305	418,911,292
Denominator used for losses per share	430,011,263	430,011,263	428,586,305	418,911,292
Class B Ordinary shares [Member]
Numerator:
Allocation of net loss from continuing operations attributable to 500.com Limited's ordinary shareholders used in calculating income per ordinary share-basic	¥ (440)	$ (67)	¥ (50,494)	¥ (82,216)
Denominator:
Denominator used for losses per share	847,093	847,093	33,229,132	74,400,299
Losses per share from continuing operations - basic \| (per share)	¥ (0.52)	$ (0.08)	¥ (1.52)	¥ (1.13)
Numerator:
Allocation of net loss from continuing operations attributable to 500.com Limited's ordinary shareholders used in calculating loss per ordinary share- diluted	¥ (440)	$ (67)	¥ (50,494)	¥ (82,216)
Reallocation of net loss from continuing operations attributable to 500.com Limited's ordinary shareholders as a result of conversion of Class B to Class A shares	0	0
Net loss from continuing operations attributable to ordinary shareholders	¥ (440)	$ (67)	¥ (50,494)	¥ (82,216)
Denominator:
Weighted average number of ordinary shares outstanding used in calculating basic losses per share	847,093	847,093	33,229,132	74,400,299
Conversion of Class B to Class A ordinary shares	0	0
Denominator used for losses per share	847,093	847,093	33,229,132	74,400,299
Losses per share from continuing operations-diluted \| (per share)	¥ (0.52)	$ (0.08)	¥ (1.52)	¥ (1.13)
Losses from continuing operations per ADS:
Denominator used for losses per ADS - basic	0	0
Denominator used for losses per ADS - diluted	0	0
Losses from continuing operations per ADS - basic \| (per share)	¥ 0	$ 0
Losses from continuing operations per ADS - diluted \| (per share)	¥ 0	$ 0
Class A Ordinary shares [Member]
Numerator:
Allocation of net loss from continuing operations attributable to 500.com Limited's ordinary shareholders used in calculating income per ordinary share-basic	¥ (222,786)	$ (34,144)	¥ (600,774)	¥ (380,701)
Denominator:
Denominator used for losses per share	429,164,170	429,164,170	395,357,173	344,510,993
Losses per share from continuing operations - basic \| (per share)	¥ (0.52)	$ (0.08)	¥ (1.52)	¥ (1.13)
Numerator:
Allocation of net loss from continuing operations attributable to 500.com Limited's ordinary shareholders used in calculating loss per ordinary share- diluted	¥ (222,786)	$ (34,144)	¥ (600,774)	¥ (380,701)
Reallocation of net loss from continuing operations attributable to 500.com Limited's ordinary shareholders as a result of conversion of Class B to Class A shares	(440)	(67)	(50,494)	(82,216)
Net loss from continuing operations attributable to ordinary shareholders	¥ (223,226)	$ (34,211)	¥ (651,268)	¥ (462,917)
Denominator:
Weighted average number of ordinary shares outstanding used in calculating basic losses per share	429,164,170	429,164,170	395,357,173	344,510,993
Conversion of Class B to Class A ordinary shares	847,093	847,093	33,229,132	74,400,299
Denominator used for losses per share	430,011,263	430,011,263	428,586,305	418,911,292
Losses per share from continuing operations-diluted \| (per share)	¥ (0.52)	$ (0.08)	¥ (1.52)	¥ (1.13)
Losses from continuing operations per ADS:
Denominator used for losses per ADS - basic	42,916,417	42,916,417	39,535,717	34,451,099
Denominator used for losses per ADS - diluted	43,001,126	43,001,126	42,858,631	41,891,129
Losses from continuing operations per ADS - basic \| (per share)	¥ (5.19)	$ (0.80)	¥ (15.20)	¥ (11.28)
Losses from continuing operations per ADS - diluted \| (per share)	¥ (5.19)	$ (0.80)	¥ (15.20)	¥ (11.28)

LOSSES PER SHARE (Schedule of e

LOSSES PER SHARE (Schedule of earnings per share basic and diluted from discontinued operations) (Details) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2020¥ / sharesshares	Dec. 31, 2020$ / sharesshares	Dec. 31, 2019CNY (¥)¥ / sharesshares	Dec. 31, 2018CNY (¥)¥ / sharesshares
Denominator:
Denominator used for income per share	430,011,263	430,011,263	428,586,305	418,911,292
Numerator:
Net income from discontinued operations attributable to ordinary shareholders \| ¥			¥ 0	¥ 12,343
Denominator:
Weighted average number of ordinary shares outstanding used in calculating basic income per share	430,011,263	430,011,263	428,586,305	418,911,292
Denominator used for income per share	430,011,263	430,011,263	428,586,305	418,911,292
Class B Ordinary shares [Member]
Numerator:
Allocation of net loss from continuing operations attributable to BIT Mining Limited's ordinary shareholders used in calculating income per ordinary share-basic \| ¥				¥ 1,997
Denominator:
Denominator used for income per share	847,093	847,093	33,229,132	74,400,299
Income per share from discontinued operations - basic \| ¥ / shares				¥ 0.03
Numerator:
Allocation of net loss from continuing operations attributable to BIT Mining Limited's ordinary shareholders used in calculating loss per ordinary share- diluted \| ¥				¥ 1,997
Net income from discontinued operations attributable to ordinary shareholders \| ¥				¥ 1,997
Denominator:
Weighted average number of ordinary shares outstanding used in calculating basic income per share	847,093	847,093	33,229,132	74,400,299
Conversion of Class B to Class A ordinary shares	0	0
Denominator used for income per share	847,093	847,093	33,229,132	74,400,299
Losses per share from discontinued operations-diluted \| ¥ / shares				¥ 0.03
Income from discontinued operations per ADS:
Income from discontinued operations per ADS - basic \| (per share)	¥ 0	$ 0	¥ 0	0
Income from discontinued operations per ADS - diluted \| (per share)	¥ 0	$ 0	¥ 0	¥ 0
Class A Ordinary shares [Member]
Numerator:
Allocation of net loss from continuing operations attributable to BIT Mining Limited's ordinary shareholders used in calculating income per ordinary share-basic \| ¥				¥ 9,247
Denominator:
Denominator used for income per share	429,164,170	429,164,170	395,357,173	344,510,993
Income per share from discontinued operations - basic \| ¥ / shares				¥ 0.03
Numerator:
Allocation of net loss from continuing operations attributable to BIT Mining Limited's ordinary shareholders used in calculating loss per ordinary share- diluted \| ¥				¥ 9,247
Reallocation of net loss from continuing operations attributable to BIT Mining Limited's ordinary shareholders as a result of conversion of Class B to Class A shares \| ¥				1,997
Net income from discontinued operations attributable to ordinary shareholders \| ¥				¥ 11,244
Denominator:
Weighted average number of ordinary shares outstanding used in calculating basic income per share	429,164,170	429,164,170	395,357,173	344,510,993
Conversion of Class B to Class A ordinary shares	847,093	847,093	33,229,132	74,400,299
Denominator used for income per share	430,011,263	430,011,263	428,586,305	418,911,292
Losses per share from discontinued operations-diluted \| ¥ / shares				¥ 0.03
Income from discontinued operations per ADS:
Denominator used for income per ADS - basic	42,916,417	42,916,417	39,535,717	34,451,099
Denominator used for income per ADS - diluted	43,001,126	43,001,126	42,858,631	41,891,129
Income from discontinued operations per ADS - basic \| (per share)	¥ 0	$ 0	¥ 0	¥ 0.27
Income from discontinued operations per ADS - diluted \| (per share)	¥ 0	$ 0	¥ 0	¥ 0.27

EQUITY TRANSACTIONS (Narrative)

EQUITY TRANSACTIONS (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	Apr. 07, 2021shares	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)shares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018CNY (¥)shares	Dec. 31, 2018USD ($)$ / sharesshares
Class of Stock [Line Items]
Authorized share capital, ordinary shares			1,000,000,000		1,000,000,000
Issuance of ordinary shares from exercise of share options, shares		125,900	125,900	3,572,880	3,572,880	6,513,460	6,513,460
Aggregate consideration from shares issued from exercise of stock options		¥ 26	$ 4	¥ 17,105		¥ 41,473
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		1,224,180	1,224,180			10,503,520	10,503,520
Minimum [Member]
Class of Stock [Line Items]
Options exercise price per share \| $ / shares					$ 0.2		$ 0.2
Maximum [Member]
Class of Stock [Line Items]
Options exercise price per share \| $ / shares					$ 1		1
Class A Ordinary shares [Member]
Class of Stock [Line Items]
Authorized share capital, ordinary shares			700,000,000		700,000,000
Ordinary shares, par value per share \| $ / shares			$ 0.00005		$ 0.00005		$ 0.00005
Conversion of Class B to Class A ordinary shares, shares		10,000,000	10,000,000	64,400,200	64,400,200
Ordinary shares issued			430,127,692		420,001,792		350,804,532
Ordinary shares, shares outstanding			430,127,692		420,001,792		350,804,532
Number of common shares issued during period	65,000	125,900	125,900	3,572,880	3,572,880	6,513,460	6,513,460
Options exercise price per share \| $ / shares			$ 0.2
Issuance of ordinary shares from exercise of share options, shares		125,900	125,900	4,797,060	4,797,060	17,016,980	17,016,980
Aggregate consideration from shares issued from exercise of stock options \| $			$ 27		$ 2,456		$ 6,014
Class B Ordinary shares [Member]
Class of Stock [Line Items]
Authorized share capital, ordinary shares			300,000,000		300,000,000
Ordinary shares, par value per share \| $ / shares			$ 0.00005
Conversion of Class B to Class A ordinary shares, shares		(10,000,000)	(10,000,000)	(64,400,200)	(64,400,200)
Ordinary shares issued			99		10,000,099		74,400,299
Ordinary shares, shares outstanding			99		10,000,099		74,400,299

FAIR VALUE MEASUREMENT (Assets

FAIR VALUE MEASUREMENT (Assets and Liabilities Measured or Disclosed At Fair Value) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits			¥ 23,849
Total	¥ 232,579	$ 35,644	336,484
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	232,579	$ 35,644	312,635
Quoted prices in active markets for identical assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits			0
Total	0		0
Quoted prices in active markets for identical assets (Level 1) [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0		0
Significant other observable inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits			23,849
Total	232,579		336,484
Significant other observable inputs (Level 2) [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	232,579		312,635
Significant unobservable inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time deposits			0
Total	0		0
Significant unobservable inputs (Level 3) [Member] \| Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	¥ 0		¥ 0

FAIR VALUE MEASUREMENT (Narrati

FAIR VALUE MEASUREMENT (Narrative) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
FAIR VALUE MEASUREMENT
Fair value measurements, Assets transfers in to Level 3	¥ 0	¥ 0	¥ 0
Fair value measurements, Assets transfers out of Level 3	0	0	0
Fair value measurements, Liability transfers in to Level 3	0	0	0
Fair value measurements, Liability transfers out of Level 3	¥ 0	¥ 0	¥ 0

SEGMENT REPORTING (Details)

SEGMENT REPORTING (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
SEGMENT REPORTING (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)	Dec. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Net revenues	¥ 21,815	$ 3,343	¥ 39,688	¥ 126,089
Depreciation and amortization	45,784	7,016	61,386	62,538
Operating loss from continuing operations	(190,792)	(29,241)	(642,839)	(344,488)
Interest income	9,093	1,394	13,448	15,308
Income tax expense	(3,654)	(560)	(7,642)	(19,602)
Segment net (loss) income from continuing operations	(221,096)	$ (33,885)	(654,286)	(471,737)
Segment assets	470,473		695,779	1,246,584	$ 72,103
Europe
Segment Reporting Information [Line Items]
Net revenues	14,929		35,596	105,511
Depreciation and amortization	1,974		28,811	31,511
Operating loss from continuing operations	8,650		(204,831)	16,638
Interest income	0		0	0
Income tax expense	(60)		(7,471)	1,412
Segment net (loss) income from continuing operations	(8,590)		(205,029)	(18,050)
Segment assets	13,417		20,928	42,527
PRC
Segment Reporting Information [Line Items]
Net revenues	6,886		4,092	20,578
Depreciation and amortization	43,810		32,575	31,027
Operating loss from continuing operations	182,142		(438,008)	327,850
Interest income	9,093		13,448	15,308
Income tax expense	(3,594)		(171)	(21,014)
Segment net (loss) income from continuing operations	(212,506)		(449,257)	(453,687)
Segment assets	¥ 457,056		¥ 674,851	¥ 1,204,057

SUBSEQUENT EVENTS (Narrative) (

SUBSEQUENT EVENTS (Narrative) (Details) $ / shares in Units, $ / shares in Units, € in Thousands, ¥ in Thousands, $ in Millions	Apr. 07, 2021shares	Feb. 23, 2021USD ($)shares	Apr. 30, 2021USD ($)$ / sharesshares	Mar. 31, 2021CNY (¥)shares	Mar. 31, 2021USD ($)$ / sharesshares	Feb. 28, 2021CNY (¥)itemshares	Feb. 28, 2021USD ($)itemshares	Jan. 31, 2021CNY (¥)shares	Jan. 31, 2021USD ($)$ / sharesshares	Jan. 31, 2021HKD ($)shares	Dec. 31, 2020USD ($)$ / sharesshares	Jul. 17, 2017EUR (€)	Aug. 31, 2021item	Jun. 30, 2021item	Dec. 31, 2021item	Dec. 31, 2020CNY (¥)shares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019CNY (¥)shares	Dec. 31, 2018CNY (¥)shares	Mar. 31, 2021HKD ($)	Mar. 19, 2021USD ($)$ / sharesshares	Feb. 28, 2021USD ($)	Feb. 02, 2021USD ($)	Jan. 31, 2021CNY (¥)	Jan. 31, 2021HKD ($)$ / shares	Jan. 20, 2021	Apr. 20, 2020EUR (€)	Dec. 31, 2019$ / shares	Dec. 31, 2019EUR (€)shares	Dec. 31, 2018$ / sharesshares
Subsequent Event [Line Items]
Percent of subscription price settled								50.00%	50.00%	50.00%
Subscription price settled \| $									$ 11,500,000
Operating loss from continuing operations																¥ (190,792)	$ (29,241,000)	¥ (642,839)	¥ (344,488)
Security deposit for claim payable \| ¥																								¥ 155,000
Redeemable Noncontrolling Interest, Equity, Common, Redemption Value \| €																											€ 1,900
Issue of shares related to restricted stock units incentive plan																1,224,180	1,224,180		10,503,520
Authorized share capital, ordinary shares											1,000,000,000						1,000,000,000												1,000,000,000
Consideration received \| $																	$ 65,000,000
Loan amount \| $																				$ 15.6					$ 173.4
Amount of loan paid pack \| ¥				¥ 5,000				¥ 8,000
Fixed interest rate				3.25%	3.25%			6.00%	6.00%	6.00%
Percentage of service fee				2.00%	2.00%
Percentage of the current Fair Market Value considered for loan				70.00%	70.00%
Loan principal \| $					$ 14,280,000
Multi Group [Member]
Subsequent Event [Line Items]
Percent of equity interest acquired												93.00%
Exchange rate																													7.8155	7.8473
Percentage of issued and outstanding ordinary shares		16.60%									7.00%						7.00%												7.00%	7.00%
Redeemable Noncontrolling Interest, Equity, Common, Redemption Value \| €																													€ 1,900
Consideration \| €												€ 49,800
United States of America, Dollars
Subsequent Event [Line Items]
Exchange rate											6.5250						6.5250
Class A Ordinary shares [Member]
Subsequent Event [Line Items]
Shares issued	65,000															125,900	125,900	3,572,880	6,513,460
Authorized share capital, ordinary shares											700,000,000						700,000,000												700,000,000
Ordinary shares, par value \| $ / shares											$ 0.00005						$ 0.00005											$ 0.00005		$ 0.00005
Ordinary shares issued											430,127,692						430,127,692												420,001,792	350,804,532
Number of common shares issued during period	65,000															125,900	125,900	3,572,880	6,513,460
Class B Ordinary shares [Member]
Subsequent Event [Line Items]
Authorized share capital, ordinary shares											300,000,000						300,000,000												300,000,000
Ordinary shares, par value \| $ / shares											$ 0.00005						$ 0.00005
Ordinary shares issued											99						99												10,000,099	74,400,299
Definitive Share Subscription Agreement with Good Luck Information Technology Co., Limited [Member]
Subsequent Event [Line Items]
Shares issued											85,572,963
Shares issued per share \| $ / shares											$ 0.269						$ 0.269
Conversion ratio											1
Value of shares issued \| $											$ 23,000,000
Subscription price settled \| $		$ 11,500,000
Number of common shares issued during period											85,572,963
Definitive Share Subscription Agreement with Good Luck Information Technology Co., Limited [Member] \| United States of America, Dollars
Subsequent Event [Line Items]
Percent of subscription price settled								50.00%	50.00%	50.00%
Subscription price settled \| $									$ 11,500,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Shares issued			29,786,600
Value of shares issued \| $			$ 65,000,000
Authorized share capital \| $																					$ 100,000,000
Loan amount																								¥ 10,000	$ 11
Number of common shares issued during period			29,786,600
Fixed interest rate								6.00%	6.00%	6.00%
Subsequent Event [Member] \| Mr. Man San Vincent Law
Subsequent Event [Line Items]
Shares issued				65,000	65,000
Value of shares issued \| $					$ 65,000,000
Share price \| $ / shares					$ 1
Number of common shares issued during period				65,000	65,000
Subsequent Event [Member] \| Mr. Man San Vincent Law \| Minimum [Member]
Subsequent Event [Line Items]
Voting power (in percent)				17.66%	17.66%
Subsequent Event [Member] \| Mr. Man San Vincent Law \| Maximum [Member]
Subsequent Event [Line Items]
Voting power (in percent)				60.28%	60.28%
Subsequent Event [Member] \| Bee Computing (HK) Limited \| Minimum [Member]
Subsequent Event [Line Items]
Invested amount \| $																							$ 30,000,000
Subsequent Event [Member] \| Bee Computing (HK) Limited \| Maximum [Member]
Subsequent Event [Line Items]
Invested amount \| $					$ 35,000,000
Subsequent Event [Member] \| Class A Ordinary shares [Member]
Subsequent Event [Line Items]
Authorized share capital, ordinary shares																					1,600,000,000
Ordinary shares, par value \| $ / shares																					$ 0.00005
Ordinary shares issued																					900,000,000
Subsequent Event [Member] \| Class B Ordinary shares [Member]
Subsequent Event [Line Items]
Authorized share capital, ordinary shares																					400,000,000
Ordinary shares, par value \| $ / shares																					$ 0.00005
Ordinary shares issued																					100,000,000
Subsequent Event [Member] \| Definitive Purchase Agreement with Certain Sellers
Subsequent Event [Line Items]
Consideration to acquire bitcoin \| $									$ 14,400,000
Shares issued								11,882,860	11,882,860	11,882,860
Number of bitcoin mining machines purchased \| item						5,900	5,900
Values of bitcoin mining machines purchased						¥ 55,200	$ 8,500,000
Expected full delivery of bitcoin mining machine \| item						26	26
Number of common shares issued during period								11,882,860	11,882,860	11,882,860
Subsequent Event [Member] \| Definitive Purchase Agreement with Certain Sellers \| Star Light Inc. [Member]
Subsequent Event [Line Items]
Consideration to acquire bitcoin \| $									$ 14,400,000
Percent of equity interest acquired																								100.00%	100.00%
Subsequent Event [Member] \| Definitive Purchase Agreement with Certain Sellers \| Class A Ordinary shares [Member]
Subsequent Event [Line Items]
Shares issued per share \| $ / shares									$ 1.21
Subsequent Event [Member] \| Framework Agreement [Member]
Subsequent Event [Line Items]
Number of bitcoin mining machines purchased \| item						10,000	10,000
Performance Bond Payable per Machine \| ¥						¥ 2,000
Performance bond payable						10,000																$ 1,500,000
Subsequent Event [Member] \| Definitive Purchase Agreement with Seller to Purchase 1,923 S17 Bitcoin Mining Machines \| BitDeer [Member]
Subsequent Event [Line Items]
Values of bitcoin mining machines purchased						¥ 31,300	$ 4,900,000
Subsequent Event [Member] \| Definitive Agreement to Purchase Ethereum Mining Machines [Member]
Subsequent Event [Line Items]
Number of ETH mining machines purchased \| item						2,000	2,000
Value of ETH mining machines purchased						¥ 195,000	$ 30,200,000
Expected delivery of ETH \| item													300	100	1,600
Subsequent Event [Member] \| Definitive Share Subscription Agreement with Good Luck Information Technology Co., Limited [Member]
Subsequent Event [Line Items]
Shares issued		85,572,963
Exchange rate																										32,326.29
Number of common shares issued during period		85,572,963
Subsequent Event [Member] \| Share Subscription Agreement [Member] \| Loto Interactive Limited [Member]
Subsequent Event [Line Items]
Percent of equity interest acquired					54.20%															54.20%
Shares subscribed								169,354,839	169,354,839	169,354,839
Share price \| $ / shares																									$ 0.62
Total consideration									$ 13,500,000	$ 105
Subsequent Event [Member] \| Share Subscription Agreement [Member] \| Ganzi Changhe Hydropower Consumption Service Co.,Ltd [Member]
Subsequent Event [Line Items]
Expected voting interest to be acquired								100.00%	100.00%	100.00%
Cash consideration								¥ 88,200	$ 13,600,000
Subsequent Event [Member] \| Share Exchange Agreement with Blockchain Alliance Technologies Holding Company [Member]
Subsequent Event [Line Items]
Shares issued						44,353,435	44,353,435
Percentage of outstanding shares issued						10.00%	10.00%
Number of common shares issued during period						44,353,435	44,353,435
Subsequent Event [Member] \| Share Exchange Agreement with Blockchain Alliance Technologies Holding Company [Member] \| BTC.com Pool Businesses [Member] \| If Businesses Record Net Operating Profit in Fiscal Year Ending December 31, 2021 [Member]
Subsequent Event [Line Items]
Operating loss from continuing operations \| $							$ 20,000,000
Maximum shares issuable						22,176,718	22,176,718
Outstanding shares (in percent) \| $							$ 5
Subsequent Event [Member] \| Share Exchange Agreement with Blockchain Alliance Technologies Holding Company [Member] \| BTC.com Pool Businesses [Member] \| If Businesses Record Net Operating Loss in Fiscal Year Ending December 31, 2021 [Member]
Subsequent Event [Line Items]
Operating loss from continuing operations \| $							10,000,000
Outstanding shares (in percent) \| $							$ 1
Shares subject to repurchase arrangement						4,435,344	4,435,344
Subsequent Event [Member] \| Share exchange agreement
Subsequent Event [Line Items]
Value of shares issued \| $			$ 35,000,000
Maximum shares issuable			16,038,930
Number of shares per ADS			10
Subsequent Event [Member] \| Share exchange agreement \| Bee Computing (HK) Limited
Subsequent Event [Line Items]
Maximum shares issuable			45,825,530
Value per share \| $ / shares			$ 21.82
Consideration \| $			$ 100,000,000
Percentage of shares			8.18%
Subsequent Event [Member] \| Share exchange agreement \| Bee Computing (HK) Limited \| Minimum [Member]
Subsequent Event [Line Items]
Value per share \| $ / shares			$ 2.182
Subsequent Event [Member] \| Share exchange agreement \| Bee Computing (HK) Limited \| Maximum [Member]
Subsequent Event [Line Items]
Value per share \| $ / shares			$ 21.82
Subsequent Event [Member] \| Share exchange agreement \| Class A Ordinary shares [Member] \| Bee Computing (HK) Limited
Subsequent Event [Line Items]
Shares issued			45,825,530
Number of common shares issued during period			45,825,530

CONDENSED FINANCIAL INFORMATI_3

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Schedule of Condensed Balance Sheets) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2017CNY (¥)
Current assets:
Cash and cash equivalents	¥ 308,676	$ 47,307	¥ 361,220
Total current assets	335,853	51,472	430,326
Non-current assets:
Property and equipment, net	19,779	3,031	64,112
Total non-current assets	134,620	20,631	265,453
TOTAL ASSETS	470,473	72,103	695,779		¥ 1,246,584
Current liabilities:
Accrued payroll and welfare payable	13,401	2,054	6,879
Accrued expenses and other liabilities	55,960	8,577	51,398
Total current liabilities	73,620	11,284	77,162
TOTAL LIABILITIES	79,953	12,255	111,861
Shareholders' equity:
Additional paid-in capital	2,602,883	398,909	2,547,293
Treasury shares	(143,780)	(22,035)	(143,780)
Accumulated other comprehensive income	128,441	19,684	141,484
Total BIT Mining Limited shareholders' equity	403,777	61,880	584,456
TOTAL LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND SHAREHOLDERS' EQUITY	470,473	72,103	695,779
Class A Ordinary shares [Member]
Shareholders' equity:
Ordinary shares, value	151	22	145
Class B Ordinary shares [Member]
Shareholders' equity:
Ordinary shares, value			6
Parent Company [Member]
Current assets:
Cash and cash equivalents	3,325	510	6,116	$ 938	¥ 12,338	¥ 1,304
Other current assets	8,465	1,297	9,101
Amounts Due From Intergroup Companies	470,077	72,042	515,160
Total current assets	481,867	73,849	530,377
Non-current assets:
Investment in subsidiaries and VIEs	(53,317)	(8,172)	62,087
Property and equipment, net			82
Total non-current assets	(53,317)	(8,172)	62,169
TOTAL ASSETS	428,550	65,677	592,546
Current liabilities:
Accrued payroll and welfare payable	840	129	390
Accrued expenses and other liabilities	6,752	1,035	3,139
Amounts due to intergroup companies	17,181	2,633	4,561
Total current liabilities	24,773	3,797	8,090
TOTAL LIABILITIES	24,773	3,797	8,090
Shareholders' equity:
Additional paid-in capital	2,602,883	398,909	2,547,293
Treasury shares	(143,780)	(22,035)	(143,780)
Accumulated other comprehensive income	128,441	19,684	141,484
Accumulated deficit and statutory reserve	(2,183,918)	(334,700)	(1,960,692)
Total BIT Mining Limited shareholders' equity	403,777	61,880	584,456
TOTAL LIABILITIES, REDEEMABLE NON-CONTROLLING INTEREST AND SHAREHOLDERS' EQUITY	428,550	65,677	592,546
Parent Company [Member] \| Class A Ordinary shares [Member]
Shareholders' equity:
Ordinary shares, value	¥ 151	$ 22	145
Parent Company [Member] \| Class B Ordinary shares [Member]
Shareholders' equity:
Ordinary shares, value			¥ 6

CONDENSED FINANCIAL INFORMATI_4

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Schedule of Condensed Balance Sheets) (Parenthetical) (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares authorized	1,000,000,000	1,000,000,000
Class A Ordinary shares [Member]
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.00005	$ 0.00005	$ 0.00005
Ordinary shares, shares authorized	700,000,000	700,000,000
Ordinary shares, shares issued	430,127,692	420,001,792	350,804,532
Ordinary shares, shares outstanding	430,127,692	420,001,792	350,804,532
Class B Ordinary shares [Member]
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.00005
Ordinary shares, shares authorized	300,000,000	300,000,000
Ordinary shares, shares issued	99	10,000,099	74,400,299
Ordinary shares, shares outstanding	99	10,000,099	74,400,299
Parent Company [Member] \| Class A Ordinary shares [Member]
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares authorized	700,000,000	700,000,000
Ordinary shares, shares issued	430,127,692	420,001,792
Ordinary shares, shares outstanding	430,127,692	420,001,792
Parent Company [Member] \| Class B Ordinary shares [Member]
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, shares authorized	300,000,000	300,000,000
Ordinary shares, shares issued	99	10,000,099

CONDENSED FINANCIAL INFORMATI_5

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Schedule of Condensed statements of comprehensive loss) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Condensed Income Statements, Captions [Line Items]
Net revenues	¥ 21,815	$ 3,343	¥ 39,688	¥ 126,089
Operating expenses:
Sales and marketing	(16,748)	(2,567)	(42,445)	(92,465)
General and administrative	(152,541)	(23,378)	(223,758)	(251,384)
Operating loss from continuing operations	(190,792)	(29,241)	(642,839)	(344,488)
Interest income	9,093	1,394	13,448	15,308
Loss before income tax	(224,750)	(34,445)	(661,928)	(491,339)
Income tax benefit	(3,654)	(560)	(7,642)	(19,602)
Net loss attributable to BIT Mining Limited	(223,226)	(34,211)	(651,268)	(451,673)
Foreign currency translation gain (loss)	(11,825)	(1,812)	6,408	23,023
Share of other comprehensive loss from an equity method investee	(1,218)	(187)	(3,986)	0
Comprehensive loss attributable to BIT Mining Limited	(236,269)	(36,210)	(647,520)	(429,988)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues			0	0
Operating expenses:
Sales and marketing	(30)	(5)	(57)	(1,784)
General and administrative	(57,542)	(8,819)	(29,437)	(177,455)
Total operating expenses	(57,572)	(8,824)	(29,494)	(179,239)
Operating loss from continuing operations	(57,572)	(8,824)	(29,494)	(179,239)
Interest income	237	36	122	2
Equity in loss of subsidiaries and VIEs	(165,891)	(25,423)	(621,896)	(272,436)
Loss before income tax	(223,226)	(34,211)	(651,268)	(451,673)
Net loss attributable to BIT Mining Limited	(223,226)	(34,211)	(651,268)	(451,673)
Foreign currency translation gain (loss)	(11,825)	(1,812)	7,734	21,685
Share of other comprehensive loss from an equity method investee	(1,218)	(187)	(3,986)	0
Comprehensive loss attributable to BIT Mining Limited	¥ (236,269)	$ (36,210)	¥ (647,520)	¥ (429,988)

CONDENSED FINANCIAL INFORMATI_6

CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY (Schedule of Condensed Statements of Cash Flows) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020CNY (¥)	Dec. 31, 2020USD ($)	Dec. 31, 2019CNY (¥)	Dec. 31, 2018CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents at beginning of the year	¥ 361,220
Cash and cash equivalents at end of the year	308,676	$ 47,307	¥ 361,220
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in operating activities	(17,685)	(2,710)	(29,759)	¥ (91,547)
Net cash provided by (used in) investing activities	(13,028)	(1,997)	(58,359)	(56,941)
Net cash (used in) provided by financing activities	28,213	4,324	81,693	159,456
Effect of exchange rate changes on cash and cash equivalents	(291)	(45)	203	66
Net (decrease) increase in cash and cash equivalents	(2,791)	(428)	(6,222)	11,034
Cash and cash equivalents at beginning of the year	6,116	938	12,338	1,304
Cash and cash equivalents at end of the year	¥ 3,325	$ 510	¥ 6,116	¥ 12,338