Roblox (RBLX) 10-Q16 Aug 212021 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2021	Aug. 09, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-39763
Entity Registrant Name	Roblox Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0991664
Entity Address, Address Line One	970 Park Place
Entity Address, Address Line Two	San Mateo
Entity Address, City or Town	San Mateo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94403
City Area Code	888
Local Phone Number	858-2569
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Trading Symbol	RBLX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Small Business	false
Entity Ex Transition Period	false
Entity Shell Company	false
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001315098
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		521,564,924
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		53,587,302

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,780,262	$ 893,943
Accounts receivable—net of allowances	217,010	246,986
Prepaid expenses and other current assets	45,432	26,274
Deferred cost of revenue, current portion	351,573	256,928
Total current assets	2,394,277	1,424,131
Property and equipment—net	218,581	206,415
Operating lease right-of-use assets	228,232
Deferred cost of revenue, long-term	127,011	113,793
Intangible assets, net	38,079	42,326
Goodwill	59,568	59,568
Other assets	8,043	1,567
Total assets	3,073,791	1,847,800
Current liabilities:
Accounts payable	11,112	12,012
Accrued expenses and other current liabilities	182,084	65,392
Developer exchange liability	90,615	80,912
Deferred revenue—current portion	1,488,200	1,070,230
Total current liabilities	1,772,011	1,228,546
Deferred revenue—net of current portion	551,665	484,699
Operating lease liabilities	206,376
Other long-term liabilities	1,700	22,109
Total liabilities	2,531,752	1,735,354
Commitments and contingencies (Note 11)
Convertible Preferred Stock
Convertible preferred stock	0	344,827
Stockholders’ Equity (Deficit)
Preferred stock	0	0
Common stock	57	20
Additional paid-in capital	1,293,160	239,792
Accumulated other comprehensive income	114	90
Accumulated deficit	(766,641)	(492,290)
Total Roblox Corporation stockholders’ equity (deficit)	526,690	(252,388)
Noncontrolling interests	15,349	20,007
Total stockholders’ equity (deficit)	542,039	(232,381)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 3,073,791	$ 1,847,800

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000,000	0
Preferred stock, shares Issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	5,000,000,000	740,000,000
Common stock, shares issued (in shares)	574,595,000	201,327,000
Common stock, shares outstanding (in shares)	574,595,000	201,327,000
Common Class A
Common stock, shares authorized (in shares)	4,935,000,000	675,000,000
Common stock, shares issued (in shares)	521,008,000	144,039,000
Common stock, shares outstanding (in shares)	521,008,000	144,039,000
Common Class B
Common stock, shares authorized (in shares)	65,000,000	65,000,000
Common stock, shares issued (in shares)	53,587,000	57,287,000
Common stock, shares outstanding (in shares)	53,587,000	57,287,000
Convertible Preferred Stock
Convertible preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Convertible preferred stock, shares authorized (in shares)	0	349,522,000
Convertible preferred stock, shares issued (in shares)	0	337,235,000
Convertible referred stock, shares outstanding (in shares)	0	337,235,000
Convertible preferred stock, aggregate liquidation preference	$ 0	$ 335,654

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue		$ 454,100	$ 200,392	$ 841,076	$ 361,962
Cost and expenses:
Cost of revenue	[1]	116,930	53,669	214,867	95,462
Developer exchange fees		129,714	85,052	248,652	129,551
Infrastructure and trust & safety		108,986	61,853	203,122	114,473
Research and development		124,748	40,249	221,392	89,658
General and administrative		97,678	18,707	192,053	49,265
Sales and marketing		18,990	13,908	38,992	29,565
Total cost and expenses		597,046	273,438	1,119,078	507,974
Loss from operations		(142,946)	(73,046)	(278,002)	(146,012)
Interest income		26	294	31	1,541
Other income/(expense), net		10	494	(1,040)	(2,663)
Loss before provision for income taxes		(142,910)	(72,258)	(279,011)	(147,134)
Provision for income taxes		20	5	22	6
Consolidated net loss		(142,930)	(72,263)	(279,033)	(147,140)
Net loss attributable to the noncontrolling interest		(2,796)	(742)	(4,682)	(1,240)
Net loss attributable to common stockholders		$ (140,134)	$ (71,521)	$ (274,351)	$ (145,900)
Net loss per share attributable to common stockholders, basic (in dollars per share)		$ (0.25)	$ (0.40)	$ (0.63)	$ (0.83)
Net loss per share attributable to common stockholders, diluted (in dollars per share)		$ (0.25)	$ (0.40)	$ (0.63)	$ (0.83)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic (in shares)		571,300,000	180,336,000	432,159,000	174,939,000
Weighted-average shares used in computing net loss per share attributable to common stockholders—diluted (in shares)		571,300,000	180,336,000	432,159,000	174,939,000

[1]	Depreciation of servers and infrastructure equipment included in infrastructure and trust & safety.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Consolidated Net loss	$ (142,930)	$ (72,263)	$ (279,033)	$ (147,140)
Other comprehensive income/(loss):
Foreign currency translation adjustments	48	(1)	48	(1)
Net change in unrealized gains (loss) on available-for-sale marketable securities, net of tax	0	(157)	0	59
Other comprehensive income/(loss), net of tax	48	(158)	48	58
Total comprehensive loss including noncontrolling interests	(142,882)	(72,421)	(278,985)	(147,082)
Less: net loss attributable to noncontrolling interests	(2,796)	(742)	(4,682)	(1,240)
Less: cumulative translation adjustments attributable to noncontrolling interests	24	0	24	0
Total comprehensive loss attributable to noncontrolling interests	(2,772)	(742)	(4,658)	(1,240)
Total comprehensive loss attributable to common stockholders	$ (140,110)	$ (71,679)	$ (274,327)	$ (145,842)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Convertible Preferred Stock And Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands		Total	Convertible Preferred Stock	Convertible Preferred StockSeries D One Warrants	Convertible Preferred StockSeries H Preferred Stock	Convertible Preferred StockSeries G Preferred Stock	Class A and Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Non- controlling Interest
Balance beginning (Shares) at Dec. 31, 2019			324,304				166,768
Balance beginning at Dec. 31, 2019		$ (112,949)	$ 187,191				$ 17	$ 101,671	$ 39	$ (239,036)	$ 24,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercises of stock option (in shares)							15,346
Issuance of common stock upon exercises of stock options		6,125					$ 1	6,124
Stock- based compensation		49,666						49,666
Others		59							59
Cumulative translation adjustments		(1)							(1)		0
Net loss		(147,140)								(145,900)	(1,240)
Issuance of preferred stock, net (in shares)						23,645
Issuance of preferred stock, net						$ 149,669
Conversion of convertible preferred stock to common stock in connection with the direct listing		0
Series D-1 warrants upon exercise of warrants for cash (in shares)	[1]			1,574
Series D-1 warrants upon exercise of warrants for cash	[1]			$ 8,225
Balance ending (Shares) at Jun. 30, 2020			349,523				182,114
Balance ending at Jun. 30, 2020		(204,240)	$ 345,085				$ 18	157,461	97	(384,936)	23,120
Balance beginning (Shares) at Mar. 31, 2020			349,523				170,357
Balance beginning at Mar. 31, 2020		(144,070)	$ 345,085				$ 17	145,211	255	(313,415)	23,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercises of stock option (in shares)							11,757
Issuance of common stock upon exercises of stock options		4,842					$ 1	4,841
Stock- based compensation		7,409						7,409
Others		(157)							(157)
Cumulative translation adjustments		(1)							(1)		0
Net loss		(72,263)								(71,521)	(742)
Balance ending (Shares) at Jun. 30, 2020			349,523				182,114
Balance ending at Jun. 30, 2020		(204,240)	$ 345,085				$ 18	157,461	97	(384,936)	23,120
Balance beginning (Shares) at Dec. 31, 2020			337,235				201,327
Balance beginning at Dec. 31, 2020		$ (232,381)	$ 344,827				$ 20	239,792	90	(492,290)	20,007
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercises of stock option (in shares)		24,139					24,139
Issuance of common stock upon exercises of stock options		$ 41,889					$ 2	41,887
Stock- based compensation		132,403						132,403
Release of restricted stock units (in shares)							4
Others (in shares)							1
Cumulative translation adjustments		48							24		24
Net loss		(279,033)								(274,351)	(4,682)
Issuance of preferred stock, net (in shares)					11,889
Issuance of preferred stock, net					$ 534,286
Conversion of convertible preferred stock to common stock in connection with the direct listing (in shares)			(349,124)				349,124
Conversion of convertible preferred stock to common stock in connection with the direct listing		879,113	$ (879,113)				$ 35	879,078
Balance ending (Shares) at Jun. 30, 2021							574,595
Balance ending at Jun. 30, 2021		542,039					$ 57	1,293,160	114	(766,641)	15,349
Balance beginning (Shares) at Mar. 31, 2021			0				568,894
Balance beginning at Mar. 31, 2021		591,594	$ 0				$ 57	1,199,833	90	(626,507)	18,121
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercises of stock option (in shares)							5,696
Issuance of common stock upon exercises of stock options		11,668					$ 0	11,668
Stock- based compensation		81,659						81,659
Release of restricted stock units (in shares)							4
Others (in shares)							1
Cumulative translation adjustments		48							24		24
Net loss		(142,930)								(140,134)	(2,796)
Balance ending (Shares) at Jun. 30, 2021							574,595
Balance ending at Jun. 30, 2021		$ 542,039					$ 57	$ 1,293,160	$ 114	$ (766,641)	$ 15,349

[1]	Exercise of warrants for gross proceeds of $0.1 million and a reclassification of warrant liability fair market value of $8.1 million as of the exercise date.

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Convertible Preferred Stock And Stockholders' Equity (Deficit) (Parenthetical) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
Statement of Stockholders' Equity [Abstract]
Proceeds from exercise of warrants	$ 0.1
Reclassification of warrant liability fair market value	$ 8.1

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (279,033)	$ (147,140)
Adjustments to reconcile net loss including noncontrolling interests to net cash provided by operations:
Depreciation and amortization	34,410	18,852
Stock-based compensation expense	132,403	49,666
Change in fair value of warrants	0	1,890
Operating lease non-cash expense	20,544
Other non-cash charges/(credits)	16	1,721
Changes in operating assets and liabilities:
Accounts receivable	29,960	(84,119)
Accounts payable	2,313	(988)
Prepaid expenses and other current assets	(27,264)	(6,835)
Other assets	(6,476)	1,392
Developer exchange liability	9,703	25,155
Accrued expenses and other current liabilities	74,129	9,834
Other long-term liability	584	1,836
Operating lease liabilities	(12,642)	0
Deferred revenue	484,936	384,303
Deferred cost of revenue	(107,863)	(95,442)
Net cash provided by operating activities	355,720	160,125
Cash flows from investing activities:
Acquisition of property and equipment	(45,368)	(26,249)
Purchases of short-term investments	0	(5,991)
Maturities of short-term investments	0	36,000
Purchases of intangible assets	(256)	(579)
Net cash (used in)/provided by investing activities	(45,624)	3,181
Cash flows from financing activities:
Proceeds from issuance of preferred stock for warrant exercises	0	147
Proceeds from issuance of common stock	41,889	5,996
Net proceeds from issuance of preferred stock	534,286	149,669
Net cash provided by financing activities	576,175	155,812
Effect of exchange rate changes on cash and cash equivalents	48	(3)
Net increase in cash and cash equivalents	886,319	319,115
Cash and cash equivalents
Beginning balance	893,943	301,493
Ending balance	1,780,262	620,608
Supplemental disclosure of cash flow information:
Cash paid for interest	0	0
Cash paid for income taxes	0	0
Supplemental disclosure of noncash investing and financing activities:
Property and equipment additions in accounts payable and accrued expenses	10,820	16,343
Conversion of convertible preferred stock to common stock upon direct listing	$ 879,113	$ 0

Organization and Description of

Organization and Description of Business	6 Months Ended
Organization and Description of Business	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Description of Business Roblox Corporation, or the Company, was incorporated under the laws of the state of Delaware in March 2004. The Company operates a human co-experience platform, or the Platform, or Roblox Platform, where users interact with each other to explore and develop immersive, user-generated, 3D experiences. Upon signing up for Roblox, a user personalizes their unique Roblox identity, or avatar. Users are then free to immerse themselves in experiences on Roblox and can acquire experience-specific enhancements or avatar items in the Company’s Avatar Marketplace using the virtual currency, or Robux. Any user can be a developer or creator on the Company’s platform. Developers build experiences published on Roblox and can earn Robux through microtransactions in their experiences, through engagement-based payouts, and by selling virtual items in the Roblox virtual economy . Direct Listing On March 10, 2021, the Company completed a direct listing of its Class A common stock (“Direct Listing”) on the New York Stock Exchange (“NYSE”). The Company incurred fees primarily related to financial advisory service, audit and legal expenses, in connection with the Direct Listing and recorded general and administrative expenses of $50.7 million during the three months ended March 31, 2021. Immediately prior to the Direct Listing, all shares of outstanding convertible preferred stock were converted into an equivalent number of shares of Class A common stock.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Fiscal Year The Company’s fiscal year ends on December 31. For example, references to fiscal 2021 and 2020 refer to the fiscal year ending December 31, 2021 and December 31, 2020, respectively. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Accordingly, they do not include all disclosures normally required in annual consolidated financial statements prepared in accordance with GAAP. Therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s final prospectus dated March 2, 2021 (“Effective Date”) and filed with the SEC pursuant to Rule 424(b)(4) on March 10, 2021 (“Final Prospectus”). In our opinion, the information contained herein reflects all adjustments necessary for a fair presentation of our results of operations, financial position, cash flows, and stockholders’ equity. All such adjustments are of a normal, recurring nature. The results of operations for the three and six months ended June 30, 2021 shown in this report are not necessarily indicative of the results to be expected for the full year ending December 31, 2021 or any other period. There have been no material changes in our significant accounting policies as described in our consolidated financial statements for the year ended December 31, 2020 included in the Final Prospectus, other than the adoption of accounting pronouncements as described below under the heading “Leases” and in Note 3, “Recent Accounting Pronouncements,” of the Notes to Condensed Consolidated Financial Statements. Certain reclassifications have been made to prior period balances in order to conform to the current period presentation within the cash flows from operating activities in the condensed consolidated statements of cash flows. These reclassifications were not material and had no impact on previously reported net cash used in operating activities in the Company’s Condensed Consolidated Statements of Cash Flows for any periods presented. Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and subsidiaries over which the Company has control. All intercompany transactions and balances have been eliminated. The condensed consolidated financial statements include 100% of the accounts of wholly owned and majority owned subsidiaries, and the ownership interest of minority investors is recorded as noncontrolling interest. Stock Split On January 31, 2020, the Company’s board of directors approved an amendment to its certificate of incorporation to effect a split of shares of the issued and outstanding common stock and convertible preferred stock at a 2-for-1 ratio. The stock split was approved by the Company’s stockholders and effected on January 31, 2020. All issued and outstanding shares of common stock and convertible preferred stock, dividend rates, conversion rates, options to purchase common stock, exercise prices, and the related per-share amounts contained in these condensed consolidated financial statements have been adjusted to reflect these stock splits for all periods presented. Segments The Company operates as a single operating segment. The chief operating decision maker of the Company is its Chief Executive Officer (“CEO”), who makes resource allocation decisions and assesses performance based on financial information presented on a consolidated basis, accompanied by disaggregated information of our revenue. Accordingly, the Company has determined that it has a single reportable segment and operating segment structure. Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. The Company bases its estimates on historical experience and also on assumptions that management considers reasonable. Significant estimates and assumptions reflected in the condensed consolidated financial statements include, but are not limited to, the estimated period of time the virtual items are available to the user and the estimated consumable and durable virtual items purchased for which the Company lacks specific information that we use for revenue recognition, useful lives of property and equipment and intangible assets, valuation of acquired goodwill and intangible assets, accrued liabilities (including accrued developer exchange fees), contingent liabilities, valuation of deferred tax assets and liabilities, stock-based compensation, the carrying value of operating lease right-of-use assets and evaluation of recoverability of long-lived assets. The Company assesses these estimates on a regular basis; however, actual results could differ materially from these estimates. Management believes that the estimates, and judgments upon which they rely, are reasonable based upon information available to them at the time that these estimates and judgments are made. To the extent that there are material differences between these estimates and actual results, the Company’s consolidated financial statements will be affected. The novel coronavirus, or COVID-19, pandemic has created, and may continue to create, significant uncertainty in macroeconomic conditions. The full extent to which the COVID-19 pandemic will directly or indirectly impact the global economy, the lasting social effects, and impact on the Company’s business, results of operations, and financial condition will depend on future developments, such as COVID-19 vaccination rates and the availability of COVID-19 vaccines both globally and in the U.S., that are highly uncertain and cannot be accurately predicted. As of the date of issuance of the condensed consolidated financial statements, the Company is not aware of any specific event of circumstance related to COVID-19 that would require it to update its estimates or judgments or adjust the carrying value of its assets or liabilities. Actual results could differ from those estimates and any such differences may be material to the condensed consolidated financial statements. As events continue to evolve and additional information becomes available, the Company’s estimates and assumptions may change materially in future periods. Concentration of Credit Risk and Significant Customers —Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivables. Cash and cash equivalents are deposited with high quality financial institutions and may, at times, exceed federally insured limits. Management believes that the financial institutions that hold the Company’s deposits are financially credit worthy and, accordingly, minimal credit risk exists with respect to those balances. Generally, these deposits may be redeemed upon demand and, therefore, bear minimal interest rate risk. The Company provides credit, in the normal course of business, to various customers, performs ongoing credit evaluations of its customers, and maintains allowances for potential credit losses on customers’ accounts when deemed necessary. The Company has not experienced any material credit losses to date. The Company uses various distribution channels to collect payments from users. As of June 30, 2021, and December 31, 2020, two distribution channels accounted for 64% and 50% of our accounts receivable, respectively. One of the distribution channels accounted for 45% and 25% of our accounts receivable as of June 30, 2021 and December 31, 2020, respectively. The second distribution channel accounted for 19% and 25% of our accounts receivable as of June 30, 2021 and December 31, 2020, respectively. One distribution channel processed 35% of our overall revenue transactions for each of the three and six months ended June 30, 2021, and 35% and 34% for the three and six months ended June 30, 2020, respectively. A second distribution channel processed 19% of our overall revenue transactions for each of the three and six months ended June 30, 2021 and 19% and 18% for the three and six months ended June 30, 2020, respectively. Revenue Recognition Revenue Recognition Policy In accordance with Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”) , revenue is recognized when control of the service is transferred to the customer. The amount of revenue recognized reflects the consideration that we expect to be entitled to in exchange for these services. To achieve the core principle of this standard, we determine revenue recognition by: • identifying the contract, or contracts, with the customer; • identifying the performance obligations in the contract; • determining the transaction price; • allocating the transaction price to performance obligations in the contract; and • recognizing revenue when, or as, we satisfy performance obligations by transferring the promised services. We derive substantially all of our revenue from the sale of virtual items on the Roblox Platform. Roblox Platform We operate the Roblox Platform as live services that allow users to play and socialize with others for free. Within the experience, however, users can purchase virtual currency (Robux) to obtain virtual items to enhance their social experience. Proceeds from the sale of Robux are initially recorded in deferred revenue and recognized as revenues as a user purchases and consumes virtual items. Our identified performance obligation is to provide users with the ability to acquire, use, and hold virtual items on the Roblox Platform over the estimated period of time the virtual items are available to the user or until the virtual items are consumed. Users can purchase Robux, as one-time purchases or through monthly subscriptions via mobile payments, credit cards, or prepaid cards. Payments from users are non-refundable and relate to non-cancellable contracts for a fixed price that specify our obligations. Revenue is recorded net of taxes, assessed by a government authority that are both imposed on and concurrent with specific revenue transactions between us and our users, and estimated chargebacks. Such payments are initially recorded to deferred revenue. The satisfaction of our performance obligation is dependent on the nature of the virtual item purchased and as a result, we categorize our virtual items as either consumable or durable • Consumable virtual items represent items that can be consumed by a specific user action. Common characteristics of consumable virtual items may include items that are no longer displayed on the user’s inventory after a short period of time or do not provide the user any continuing benefit following consumption. For the sale of consumable virtual items we recognize revenue as the items are consumed. • Durable virtual items represent items which result in a persistent change to a users’ character or item set (e.g., virtual hat, pet, or house). These items are generally available to the customer to hold, use, or display for as long as they are on our Roblox Platform. We recognize revenue from the sale of durable virtual items ratably over the estimated period of time the items are available to the user which is estimated as the average lifetime of a paying user. To separately account for consumable and durable virtual items, the Company specifically identifies each purchase for the majority of virtual items purchased on the Roblox Platform. For the remaining population, the Company estimates the amount of consumable and durable virtual items purchased based on data from specifically identified purchases and the expected behavior of the users within similar experiences. The average lifetime of a paying user estimate is calculated based on historical monthly retention data for each user cohort to project future participation on the Roblox Platform and is currently estimated to be 23 months. Determining the estimated average lifetime of a paying user requires management’s judgment. The Company considers results from prior analyses and trends in the activity of the Company’s recent user cohorts in determining the estimated average lifetime of a paying user. The Company believes this estimate is the best representation of the average life of the durable virtual items. Principal Agent Considerations The Company evaluates the sales of Robux via third-party payment processors to determine whether its revenues should be reported gross or net of fees either retained by the payment processor or paid to the developers and creators (“Developer Exchange Fees”). The Company is the principal in the transaction with the end user as a result of controlling, hosting, and integrating the delivery of the virtual items to the end user. The Company records revenue gross as a principal and records fees paid to payment processors and Developer Exchange Fees as an expense. Other Revenue Other revenue primarily consists of revenue from advertising, licenses, and royalties. The Company recognizes revenue based on the performance obligations of the underlying agreements, in an amount that reflects the consideration that the Company expects to be entitled to. Stock Based Compensation The Company measures and recognizes compensation expense for all stock-based awards, including stock options, restricted stock awards (“RSAs”), restricted stock units (“RSUs”), performance stock units (“PSUs”) granted to employees, directors, and non-employees, and stock purchase rights granted under the 2020 Employee Stock Purchase Plan (“2020 ESPP”) to employees, based on the estimated fair value of the awards on the date of grant. The fair value of each stock option granted and stock purchase right granted under the 2020 ESPP is estimated using the Black-Scholes option-pricing model and is recognized as compensation expense on a straight-line basis over the requisite service period. The Black-Scholes option pricing model requires certain subjective inputs and assumptions, including the fair value of the Company’s Class A common stock, the expected term, risk-free interest rates, expected stock price volatility, and expected dividend yield of the Company’s Class A common stock. The assumptions used to determine the fair value of the option awards represent management’s best estimates. These estimates involve inherent uncertainties and the application of management’s judgment. These assumptions and estimates are as follows: • Fair value of Class A common stock— Prior to the Direct Listing, the fair value of the shares of Class A common stock underlying the stock options has historically been determined by the Company’s board of directors along with management as there was no public market for the underlying common stock. The Company’s board of directors along with management determined the fair value of the Company’s common stock by considering a number of objective and subjective factors including: contemporaneous third-party valuations of its common stock, the valuation of comparable companies, sales of the Company’s common and convertible preferred stock to outside investors in arms-length transactions, the Company’s operating and financial performance, the lack of marketability, and the general and industry specific economic outlook, amongst other factors. After the completion of the Direct listing, the fair value of the Company’s Class A common stock is determined based on the NYSE closing price on the date of grant. • Expected term—The expected term represents the period stock-based awards are expected to be outstanding. The expected term assumptions are determined based on the vesting terms, estimated exercise behavior, post-vesting cancellations and contractual lives of the awards. • Risk-free interest rates—The risk-free interest rate is based on the implied yields in effect at the time of the grant of U.S. Treasury notes with terms approximately equal to the expected term of the award. • Expected stock price volatility— Prior to the Direct Listing, the Company used the historical volatility of the stock price of similar publicly traded peer companies. After the completion of the Direct Listing the Company continues to use the historical volatility of the stock price of similar publicly traded peer companies since it has not established sufficient public trading history. • Expected dividend yield—The Company utilized a dividend yield of zero, as it had no history or plan of declaring dividends on its common stock. RSUs granted by the Company prior to March 2021, vest upon the satisfaction of both a service-based vesting condition, which is typically four years, and a liquidity event-related performance vesting condition. The liquidity event-related performance vesting condition was satisfied on the Effective Date, and the Company recorded a cumulative stock-based compensation expense as of the Direct Listing date for those RSUs for which the service-based vesting condition has been satisfied. Stock-based compensation related to the remaining service-based period after the liquidity event-related performance vesting condition was satisfied will be recorded over the remaining requisite service period using the accelerated attribution method. Since March 2021, the Company only granted RSUs that vest upon the satisfaction of a service-based vesting condition and the compensation expense for these RSUs is recognized on a straight-line basis over the requisite service period. In February 2021, the compensation committee of the Company’s board of directors granted the CEO a Long-Term Performance Award (“CEO Long-Term Performance Award”), an RSU award that includes a service and a market condition. The fair value of the CEO Long-Term Performance Award is determined using a Monte Carlo simulation model. The associated stock-based compensation is recorded over the derived service period, using the accelerated attribution method. If the stock price goals are met sooner than the derived service period, the Company will adjust the stock-based compensation expense to reflect the cumulative expense associated with the vested portion of the CEO Long-Term Performance Award. Provided that David Baszucki continues to be the CEO of the Company, stock-based compensation expense is recognized over the derived service period, regardless of whether the stock price goals are achieved. The Company records forfeitures when they occur for all stock-based awards. Leases Effective January 1, 2021, the Company adopted Accounting Standards Update (“ASU”) No. 2016-02, “Leases (Topic 842)” (“Topic 842”) along with all subsequent ASU clarifications and improvements that are applicable to the Company on January 1, 2021 utilizing the modified retrospective transition method, which requires a cumulative-effect adjustment, if any, to the opening balance of retained earnings to be recognized on the date of adoption with prior periods not restated. The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one to 10 years and contain leasehold improvement incentives, rent holidays and escalation clauses. In addition, some of these leases have renewal options for up to five years after expiration of the initial term. The Company determines if an arrangement contains a lease at inception. The Company determines if a contract contains a lease based on whether we have the right to obtain substantially all of the economic benefits from the use of an identified asset and whether we have the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which we do not own. Operating lease right-of-use (“ROU”) assets represent our right to use an underlying asset for the lease term. Operating lease liabilities represent our obligation to make lease payments arising from the lease at the commencement date and are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. Operating lease ROU assets are recognized as the lease liability, adjusted for lease incentives received, initial direct costs and prepayments made. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date to calculate the present value of future payments. The incremental borrowing rate represents the rate of interest the Company would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. The concluded incremental borrowing rate for each respective term was derived using a synthetic credit rating established for the Company and applying it to arrive at corporate bond yields with a credit rating similar to the Company. Certain lease agreements include options to renew or terminate the lease, and such option is factored into determination of the lease term and future lease payments when it is reasonably certain that the Company will exercise the option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. Variable lease payments are expensed as incurred and are not included within the ROU asset and lease liability calculation. Variable lease payments primarily include reimbursements of costs incurred by lessors for common area maintenance and utilities. The Company subleases certain real estate under agreements that are classified as operating leases. Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company does not account for lease components (e.g., fixed payments including rent) separately from the non-lease components (e.g., common-area maintenance costs). See Note 5, “Leases” to the Notes to Condensed Consolidated Financial Statements for more information.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
Recent Accounting Pronouncements	Jun. 30, 2021
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements JOBS Act Accounting Election We are an emerging growth company, as defined in the Jumpstart Our Business Startups (JOBS) Act. The JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This provision allows an emerging growth company to delay the adoption of some accounting standards until those standards would otherwise apply to private companies. We have elected to use the extended transition period under the JOBS Act for the adoption of certain accounting standards until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our condensed consolidated financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates. The adoption dates discussed below reflect this election. Accounting Pronouncements Recently Adopted In February 2016, the FASB issued ASU No. 2016-02, Topic 842, which amends the existing accounting standards for leases. The new standard requires lessees to record a right-of-use asset and a corresponding lease liability on the balance sheet (with the exception of short-term leases). For lessees, leases will continue to be classified as either operating or financing in the income statement. The Company adopted the guidance on January 1, 2021 utilizing the modified retrospective transition method through a cumulative-effect adjustment at the beginning of the first quarter of 2021. The Company elected the package of practical expedients permitted under the transition guidance, which allowed the Company to carryforward its historical lease classification, assessment on whether a contract was or contains a lease, and initial direct costs for leases that existed prior to January 1, 2021. The Company also elected to combine its lease and non-lease components and not recognize ROU assets and lease liabilities for leases with an initial term of 12 months or less. The Company did not elect to apply the hindsight practical expedient when determining lease term and assessing impairment of ROU assets. See Note 5, “Leases” to the Notes to Condensed Consolidated Financial Statements for more information. In August 2018, the FASB issued ASU No. 2018-15, “ Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ,” which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new standard requires capitalized costs to be amortized on a straight-line basis generally over the term of the arrangement, and the financial statement presentation for these capitalized costs would be the same as that of the fees related to the hosting arrangements. This new guidance was effective for the Company beginning on January 1, 2021, the effective date and did not have a material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). The purpose of ASU 2019-12 is to reduce complexity in the accounting standards for income taxes by removing certain exceptions as well as clarifying certain allocations. This update removed the exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operation and income or a gain from other items (for example, discontinued operations or other comprehensive income). This update also addresses the split recognition of franchise taxes that are partially based on income between income-based tax and non-income-based tax. This guidance is effective for fiscal years beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. Early adoption is permitted. The Company elected to adopt ASU 2019-12 on January 1, 2021. The adoption of ASU 2019-12 did not have a material impact on the Company’s condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ” (“Topic 326”) which replaces the existing incurred loss impairment model with an expected credit loss model and requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. The guidance will be effective for the Company beginning January 1, 2023, and interim periods therein. Early adoption is permitted. The amendments in this update should be applied on a modified-retrospective basis by means of a cumulative-effect adjustment to the opening balance of retained earnings balance in the statement of financial position as of the date that the Company adopts the amendments. The Company is currently evaluating the effect that Topic 326 may have on its consolidated financial statements and related disclosures.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
Revenue from Contracts with Customers	Jun. 30, 2021
Disaggregation of Revenue [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Disaggregation of Revenue The following table summarizes revenue by region based on the billing country of users: Three Months Ended June 30, 2021 2020 Amount Percentage Amount Percentage United States and Canada ( 1) $ 309,203 68 % $ 139,769 70 % Europe 85,042 19 36,021 18 Asia-Pacific, including Australia and New Zealand 33,050 7 15,263 8 Rest of world 26,805 6 9,339 4 Total $ 454,100 100 % $ 200,392 100 % Six Months Ended June 30, 2021 2020 Amount Percentage Amount Percentage United States and Canada ( 1) $ 573,711 68 % $ 252,417 70 % Europe 157,644 19 64,441 18 Asia-Pacific, including Australia and New Zealand 61,362 7 27,957 8 Rest of world 48,359 6 17,147 4 Total $ 841,076 100 % $ 361,962 100 % (1) The Company’s net revenues in the U.S. were 64% of consolidated net revenues for each of the three and six months ended June 30, 2021, and 65% for each of the three and six months ended June 30, 2020. No individual country, other than those disclosed above, exceeded 10% of our total revenue for any period presented. Durable virtual items accounted for 88% of Roblox Platform revenue for each of the three and six months ended June 30, 2021, respectively and 86% and 87% for the three and six months ended June 30, 2020, respectively. Consumable virtual items accounted for 12% of Roblox Platform revenue for each of the three and six months ended June 30, 2021, respectively and 14% and 13% for the three and six months ended June 30, 2020, respectively. Contract Balances and Deferred Revenue The Company receives payments from its users based on the payment terms established in its contracts. Such payments are initially recorded to deferred revenue and are recognized into revenue as the Company satisfies its performance obligations. Further, payments made by the Company’s users are collected by payment processors and remitted to us generally within 30 days. Deferred revenue mostly consists of payments we receive from users in advance of revenue recognition. During the three months ended June 30, 2021 and 2020, $360.9 million and $144.4 million, respectively, of revenue was recognized that was included in the current portion deferred revenue balance at the beginning of the periods. During the six months ended June 30, 2021 and 2020, $577.0 million and $241.2 million, respectively, of revenue was recognized that was included in the current portion deferred revenue balance at the beginning of the periods. As of June 30, 2021, the aggregate amount of revenue allocated to unsatisfied performance obligations is included in our deferred revenue balances. As of June 30, 2021, the Company expects to recognize $1,488.2 million, as revenue over the next 12 months, and the remainder thereafter. As mentioned above, the Company bills in advance of its performance obligations and as such, does not have unbilled receivables.

Leases

Leases	6 Months Ended
Leases	Jun. 30, 2021
Leases [Abstract]
Leases	Leases Adoption of Topic 842 Effective January 1, 2021, the Company adopted Topic 842 utilizing the modified retrospective transition method, which requires a cumulative-effect adjustment, if any, to the opening balance of retained earnings to be recognized on the date of adoption with prior periods not restated. The primary impact for the Company was the balance sheet recognition of operating lease ROU assets and operating lease liabilities. The Company does not have any finance leases. The following table summarizes the impacts of adopting Topic 842 on the Company’s consolidated balance sheet as of December 31, 2020 (in thousands): As Reported Balance as of December 31, 2020 Adjustments due As Adjusted Balance Assets Operating lease right-of-use assets — $ 195,944 $ 195,944 Prepaid expenses and other current assets 26,274 (8,106) 18,168 Total $ 26,274 $ 187,838 $ 214,112 Liabilities Accrued expenses and other current liabilities $ 65,392 $ (1,704) $ 63,688 Other long-term liabilities 22,109 (21,983) 126 Operating lease liabilities—short-term — 32,162 32,162 Operating lease liabilities—long-term — 179,363 179,363 Total $ 87,501 $ 187,838 $ 275,339 The Company has operating leases for real estate, and co-located data centers. During the three and six months ended June 30, 2021, operating lease expense was approximately $12.8 million and $24.8 million, respectively. Variable lease cost, short-term lease cost and sublease income were immaterial during the three and six months ended June 30, 2021. As of June 30, 2021, $45.3 million was included in accrued expenses and other current liabilities The following table presents maturity of lease liabilities under the Company’s non-cancelable operating leases as of June 30, 2021 (in thousands): Remainder of 2021 $ 26,944 2022 55,855 2023 50,220 2024 41,414 2025 34,860 Thereafter 78,423 Total lease payments $ 287,716 Less: interest(1) 36,000 Present value of lease liabilities $ 251,716 (1) Calculated using the interest rate for each lease. In addition, the Company has executed operating leases for data centers, colocation space and facilities which have not commenced as of June 30, 2021. The legally binding minimum lease payments for these leases is $94.1 million with lease term ranging between three Of the above, approximately $90.0 million pertains to an amendment signed by the Company on June 30, 2021 for its headquarters office lease to include an additional space of approximately 123,000 square feet for a term of 9 years. The possession of this space is expected to be obtained in the first quarter of 2022. The following table presents supplemental information for the six months ended June 30, 2021 (in thousands, except for weighted average and percentage data): Weighted average remaining lease term 6.22 Weighted average discount rate 4.0 % Cash paid for amounts included in the measurement of lease liabilities (1) $ 25,141 Lease liabilities arising from obtaining new ROU assets $ 53,554 (1) Does not include $8.1 million of leasehold incentives received from the landlord. ASC 840 Disclosures Prior to the adoption of Topic 842, future minimum lease payments as of December 31, 2020, which were undiscounted, were as follows (in thousands): 2021 $ 51,397 2022 54,477 2023 47,915 2024 38,970 2025 32,223 Thereafter 55,882 Total lease payments $ 280,864 Rent expense for the three and six months ended June 30, 2020 was $10.0 million and $20.0 million, respectively.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The categorization of a financial instrument within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s financial instruments consist of Level 1 assets. Level 1 assets include highly liquid money market funds that are included in cash and cash equivalents and the fair value is based on quoted prices in active markets for identical assets or liabilities. As of June 30, 2021, and December 31, 2020, there are no outstanding preferred stock warrants. There were no transfers of financial assets or liabilities into or out of Level 1, Level 2, or Level 3 during any of the periods presented below. A summary of assets, related to our financial instruments, measured at fair value on a recurring basis, is set forth below (in thousands): Fair Value As of Financial Instrument Fair Value June 30, December 31, Financial Assets: Money Market funds classified as cash equivalents Level 1 $ 1,513,136 $ 310,392 The Company measures goodwill and intangible assets at fair value on a nonrecurring basis when there are identifiable events or changes in circumstances that may have a significant adverse impact on the fair value of these assets. In light of the COVID-19 pandemic, the Company performed an analysis of impairment indicators of these assets and noted no adverse impact to their fair values as of June 30, 2021.

Acquisitions

Acquisitions	6 Months Ended
Acquisitions	Jun. 30, 2021
Business Combinations [Abstract]
Acquisitions	Acquisitions Loom.ai Acquisition On December 11, 2020, the Company acquired Loom.ai, a privately-held company specializing in real-time facial animation technology for 3D avatars using deep learning, computer vision and visual effects (“VFX”). The acquisition has been accounted as a business combination. The acquisition date fair value of the consideration transferred was $86.7 million, which consisted of cash and 1.3 million shares of Class A common stock with a fair value of $40.7 million. The aggregate purchase consideration for Loom.ai was comprised of the following (in thousands): Fair Value Cash paid $ 45,998 Common stock issued 35,203 Replacement awards attributable to pre-acquisition service 5,493 Total purchase price $ 86,694 Cash consideration included reimbursement of acquisition-related transaction costs of $0.8 million incurred by Loom.ai to execute the transaction. Additionally, the acquisition-related costs were not material and were recorded as general and administrative expenses in the Company’s consolidated statements of operations for the year ended December 31, 2020. In connection with the acquisition, the Company entered into stock-based consideration revestment agreements with the Loom.ai founders. The portion of the fair value of the common stock associated with pre-acquisition service of Loom.ai founders represented a component of the total purchase consideration, as presented above. The remaining fair value of $9.2 million of these issued shares was excluded from the purchase price. These shares, which are subject to the recipients’ continued service with the Company, will be recognized ratably as stock-based compensation expense over the requisite service period of 3 years. The total purchase consideration of the Loom.ai acquisition was allocated to the tangible and intangible assets acquired, and liabilities assumed, based upon their respective fair values as of the date of the acquisition. Management determined the preliminary fair values based on a number of factors, including a valuation from an independent third-party valuation firm. The excess of the purchase price over the net assets acquired was recorded as goodwill. Goodwill is attributable to the assembled workforce and anticipated synergies arising from the acquisition. $6.7 million of the goodwill recorded in connection with the acquisition of Loom.ai is deductible for tax purposes. The following table summarizes the fair values of the assets acquired and liabilities assumed as of the acquisition date (in thousands): December 11, 2020 Cash and cash equivalents $ 5,080 Prepaid expenses and other current assets 45 Goodwill 59,568 Identified intangible asset—developed technology 29,000 Deferred tax liabilities (6,681) Accrued expenses and other current liabilities (318) Total purchase price $ 86,694 The identifiable intangible assets acquired consisted entirely of existing technology, which has a fair value of $29.0 million and an estimated remaining useful life of 5 years as of December 31, 2020. The Company expects to finalize the allocation of the purchase consideration as soon as practicable, pending finalization of income taxes. The Company currently expects to finalize this allocation during its fourth quarter ending December 31, 2021. The acquisition is not material to the Company for the periods presented, and therefore, pro forma information has not been presented. Imbellus Acquisition On November 30, 2020, the Company completed the acquisition of substantially all of the assets from Imbellus, Inc., a privately-held software company, which developed simulation-based cognitive assessments that measure human thought process. The asset acquisition consisted entirely of existing technology, which has a fair value of $11.7 million and an estimated remaining useful life of 5 years as of December 31, 2020. The purchase consideration consisted of 80,000 shares of Class A common stock, with a fair value of $2.9 million and $8.8 million of cash including direct transaction costs.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
Goodwill and Intangible Assets	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill Goodwill is recorded when the purchase price of an acquisition exceeds the fair value of the net tangible and identified intangible assets acquired. The following table represents the changes to goodwill during the six months ended June 30, 2021 (in thousands): Carrying Balance as of December 31, 2020 $ 59,568 Addition from acquisition — Balance as of June 30, 2021 $ 59,568 To date, the Company has zero accumulated impairment loss on goodwill. Intangible Assets Intangible assets are carried at cost less accumulated amortization. The following tables present details of the Company’s intangible assets as of June 30, 2021 and December 31, 2020 (in thousands, except for weighted average data): As of June 30, 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Weighted Average Remaining Useful Life (in Years) Intangible assets with finite lives Developed Technology $ 42,959 (5,454) $ 37,505 4.4 Total Intangible Assets $ 42,959 (5,454) $ 37,505 As of December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Weighted Average Remaining Useful Life (in Years) Intangible assets with finite lives Developed Technology $ 42,959 $ (1,206) $ 41,753 4.9 Total Intangible Assets $ 42,959 $ (1,206) $ 41,753 The above does not include $0.6 million each of indefinite lived intangible assets as of June 30, 2021 and December 31, 2020. Amortization expenses are recorded to the appropriate expense categories. Amortization expense was $2.1 million and $4.2 million for the three and six months ended June 30, 2021, respectively and was immaterial for each of the three and six months ended June 30, 2020. The expected future amortization expenses related to the intangible assets as of June 30, 2021 were as follows (in thousands): Remainder of 2021 $ 4,248 2022 8,495 2023 8,495 2024 8,401 2025 7,866 Thereafter — Total remaining amortization $ 37,505

Other Balance Sheet Components

Other Balance Sheet Components	6 Months Ended
Other Balance Sheet Components	Jun. 30, 2021
Other Balance Sheet Components [Abstract]
Other Balance Sheet Components	Other Balance Sheet Components The Company had no restricted cash or short-term investments as of June 30, 2021 and December 31, 2020. Prepaid expenses and other current assets Prepaid expenses and other current assets consisted of the following (in thousands): As of, June 30, December 31, Prepaid Expenses $ 40,207 $ 17,606 Other current assets 5,225 8,668 Total prepaid expenses and other current assets $ 45,432 $ 26,274 Property and equipment, net Property and equipment, net, consisted of the following (in thousands): As of, June 30, December 31, Servers and related equipment $ 300,784 $ 264,994 Computer hardware and software 5,985 3,498 Furniture and fixtures 162 162 Leasehold improvement 28,754 27,437 Construction in progress 1,723 294 Total property and equipment $ 337,408 $ 296,385 Less accumulated depreciation and amortization (118,827) (89,970) Property and equipment—net $ 218,581 $ 206,415 Construction in progress includes costs mostly related to leasehold improvements related to the Company’s office buildings. Depreciation expense was $15.7 million and $30.2 million for the three and six months ended June 30, 2021, respectively and was $9.7 million and $18.7 million for the three and six months ended June 30, 2020, respectively. Accrued expenses and other current liabilities Accrued expenses and other current liabilities consisted of the following (in thousands): As of, June 30, December 31, General accrued expenses $ 94,731 $ 41,699 Short term operating lease liabilities 45,340 — Other current liabilities 42,013 23,693 Total accrued expenses and other current liabilities $ 182,084 $ 65,392

Debt

Debt	6 Months Ended
Debt	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt In February 2019, the Company entered into an agreement for a revolving line of credit, with maximum borrowings of up to $50.0 million available under the revolving line of credit, due February 2020 with outstanding borrowings under the line of credit bearing interest at 1.5% per annum. In February 2020, this credit facility was renewed for a one-year period. As of December 31, 2020, no amounts had been borrowed under the revolving line of credit. The revolving line of credit agreement contains affirmative and negative covenants, including but not limited to maintaining minimum liquidity of $50.0 million at all times and certain limitations on liens and indebtedness. The Company was in compliance with all covenants associated with the revolving line of credit as of December 31, 2020. In February 2021, the Company terminated its agreement for a $50 million revolving line of credit. No amounts had been borrowed under the revolving line of credit.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments —The Company leases office facilities and space for data center operations under operating leases expiring in various years through 2031. Certain of these arrangements have free or escalating rent payment provisions and optional renewal clauses. All of the Company’s leases are accounted for as operating leases. See Note 5, “Leases” to the Notes to Condensed Consolidated Financial Statements for more information. Letters of Credit — The Company has issued letters of credit in connection with our operating leases. The Company has not drawn down from the letters of credit and had $9.9 million available in aggregate as of each of the periods ended June 30, 2021, and December 31, 2020. Legal Proceedings —The Company is and, from time to time, may in the future become, involved in other legal proceedings in the ordinary course of business. In accordance with U.S. GAAP, an estimated loss contingency is accrued when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. Where it is probable that costs will be incurred, and the information is sufficient to establish a range of possible liability, the Company accrues the most likely amount in the range. If no amount within the range is considered a better estimate than any other amount, the low end of the range is accrued. The Company regularly evaluates current information to determine whether any accruals should be adjusted and whether new accruals are required. On June 9, 2021, a number of entities claiming to own or control the rights to musical compositions, including Universal Music Corp., through a coordinated effort of the National Music Publishers Association, filed a lawsuit against the Company (“NMPA Lawsuit”), in the U.S. District Court for the Central District of California, captioned ABKCO Music, Inc.; Big Machine Music, LLC; Boosey & Hawkes, Inc.; Cherio Corporation; Concord Music Publishing LLC; Concord Music Group, Inc.; Downtown Music Publishing LLC; Hipgnosis SFH I Limited; Hipgnosis Songs Group, LLC; Kobalt Music Publishing America, Inc.; MPL Communications, Inc.; MPL Music Publishing, Inc.; Panther Music Corp.; Peer International Corporation; Peermusic Ltd.; Peermusic III, Ltd.; Polygram Publishing, Inc.; Rodgers & Hammerstein Holdings LLC; Pulse 2.0, LLC; Reservoir Media Management, Inc.; Songs of Peer, Ltd.; Songs of Universal, Inc.; Southern Music Publishing Co., Inc.; Spirit Music Holdings, Inc.; Universal Music – MGB NA LLC; Universal Music – Z Tunes LLC; Universal Music Corp.; Universal Music Publishing, Inc.; Universal Musica, Inc., Plaintiffs v. Roblox Corporation, Defendant, alleging that the Company engaged in copyright infringement by using certain musical compositions on its Platform without necessary licenses. In addition, the Company is subject to legal proceedings, claims, and litigation arising in the ordinary course of business. As of June 30, 2021, the Company has litigation accruals totaling $41.0 million (net of recoveries) for losses related to those litigation matters that the Company believes to be probable and for which an amount of loss can be reasonably estimated. The Company considered the progress of these cases, the opinions and views of its legal counsel and outside advisors, its experience and settlements in similar cases, and other factors in arriving at the conclusion that a potential loss was probable. The Company cannot determine a reasonable estimate of the maximum possible loss or range of loss for these matters given that they are at various stages of the litigation process and each case is subject to the inherent uncertainties of litigation. The Company may incur substantial legal fees, which are expensed as incurred, in defending against these legal proceedings. Although the maximum amount of liability that may ultimately result from any of these matters cannot be predicted with absolute certainty and the ultimate resolution of one or more of these matters could ultimately have a material adverse effect on our operations, as of June 30, 2021, the Company has accrued the potential loss related to these litigation matters that it believes is probable and can be reasonably estimated. Indemnification —In the ordinary course of business, the Company enters into agreements that may include indemnification provisions. Pursuant to such agreements, the Company may indemnify, hold harmless and defend an indemnified party for losses suffered or incurred by the indemnified party. Some of the provisions will limit losses to those arising from third-party actions. In some cases, the indemnification will continue after the termination of the agreement. The maximum potential amount of future payments the Company could be required to make under these provisions is not determinable. To date, the Company has not incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. The Company has also entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers to the fullest extent permitted by Delaware corporate law. The Company also currently has directors’ and officers’ insurance. Other Contractual Commitments —Other contractual commitments primarily consists of contracts associated with data center and IT operations. There were no material contractual obligations that were entered into during the three months ended June 30, 2021 that were outside the ordinary course of business.

Convertible Preferred Stock

Convertible Preferred Stock	6 Months Ended
Convertible Preferred Stock	Jun. 30, 2021
Convertible Preferred Stock [Abstract]
Convertible Preferred Stock	Convertible Preferred Stock In January 2021, the Company issued 11,888,886 shares of Series H convertible preferred stock to certain institutional accredited investors in a private placement at a purchase price of $45.00 per share for aggregate net proceeds of approximately $534.3 million. There was no underwriter or placement agent used in connection with this sale. The Company previously issued Series A, Series B, Series C, Series D, Series D-1, Series E, Series F, and Series G prior to 2021. In November 2020, pursuant to a conversion notice and an exchange agreement with entities affiliated with the Company’s Founder, President, CEO and Chair of the Company’s board of directors, all outstanding convertible preferred stock held by those entities were converted into our Class A common stock and thereafter all 57.3 million outstanding shares of Class A common stock held by those entities were exchanged for 57.3 million shares of Class B common stock. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Immediately prior to the completion of the Direct Listing on March 10, 2021, all outstanding shares of the Company’s convertible preferred stock converted into an aggregate of 349,123,976 shares of Class A common stock. The following table summarizes the convertible preferred stock outstanding immediately prior to the conversion into common stock, and the rights and preferences of the Company’s respective series preceding the Direct Listing in March 2021 (in thousands except per share data): Series Per share Per share Aggregate Carrying Authorized Outstanding A 28,000 16,358 $ 0.02 $ 0.02 $ 327 $ 313 B 45,532 45,532 $ 0.03 $ 0.03 1,070 1,054 C 95,290 95,290 $ 0.03 $ 0.03 2,935 4,150 D 54,860 54,215 $ 0.04 $ 0.04 2,150 2,097 D-1 44,706 44,706 $ 0.09 $ 0.09 4,172 12,998 E 24,340 24,340 $ 1.03 $ 1.03 25,000 24,906 F 33,149 33,149 $ 4.53 $ 4.53 150,000 149,640 G 23,645 23,645 $ 6.34 $ 6.34 150,000 149,669 H 12,222 11,889 $ 45.0 $ 45.0 535,000 534,286 Total 361,744 349,124 $ 870,654 $ 879,113

Stockholders' Equity (Deficit)

Stockholders' Equity (Deficit)	6 Months Ended
Stockholders' Equity (Deficit)	Jun. 30, 2021
Stockholders' Equity Note [Abstract]
Stockholders' Equity (Deficit)	Stockholders’ Equity (Deficit) Preferred Stock —The Company is authorized to issue 100 million shares of convertible preferred stock with a par value of $0.0001 per share. Common Stock —The Company’s amended and restated certificate of incorporation authorizes the issuance of Class A common stock and Class B common stock. As of June 30, 2021, the Company is authorized to issue 4,935.0 million shares of Class A common stock and 65.0 million shares of Class B common stock. Holders of Class A common stock and Class B common stock are entitled to dividends on a pro rata basis, when, as, and if declared by the Company’s board of directors, subject to the rights of the holders of the Company’s convertible preferred stock. Holders of Class A common stock are entitled to one vote per share, and holders of Class B common stock are entitled to 20 votes per share. Each share of our Class B common stock is convertible into one share of our Class A common stock at any time and will convert automatically upon certain transfers and upon the earliest of (i) the date that is specified by the affirmative vote of the holders of two-thirds of the then-outstanding shares of Class B common stock, (ii) the date on which less than 30% of the Class B common stock that was outstanding on March 2, 2021 continues to remain outstanding, (iii) March 10, 2036, (iv) nine months after the death or permanent disability of Mr. Baszucki, and (v) nine months after the date that Mr. Baszucki no longer serves as our CEO or as a member of our board of directors. Class A common stock and Class B common stock are not redeemable at the option of the holder. Nil and 3.7 million shares of Class B common stock held by entities affiliated with David Baszucki, Founder, President, CEO and Chair of our board of directors were converted to Class A common stock during the three and six months ended June 30, 2021. Class A and Class B common stock are referred to as common stock throughout the notes to the condensed consolidated financial statements, unless otherwise noted. The Company had reserved shares of common stock for future issuance as follows (in thousands): As of June 30, December 31, Stock options outstanding 73,244 98,502 RSUs outstanding 10,092 3,061 PSUs outstanding 11,500 — Shares available for issuance under Equity Incentive Plan 58,032 15,448 2020 ESPP 6,000 — Stock Warrants outstanding 324 324 Unregistered restricted stock awards outstanding 356 388 Convertible Preferred Stock outstanding — 337,235 Total 159,548 454,958

Stock-based Compensation

Stock-based Compensation	6 Months Ended
Stock-based Compensation	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-based Compensation	Stock-based Compensation 2004 Incentive Stock Plan In 2004, the Company approved the 2004 Incentive Stock Plan, or the 2004 Plan, under which the Board of Directors may grant incentive stock options to employees and nonstatutory stock options to employees, members of the Board of Directors and consultants of the Company and its subsidiaries. Under the 2004 Plan, incentive stock options and nonstatutory stock options may be granted at a price not less than fair value and 85% of the fair value, respectively (110% of fair value for incentive stock options granted to holders of 10% or more of voting stock). Fair value is determined by the Board of Directors. Options are exercisable over periods not to exceed 10 years (five years for incentive stock options granted to holders of 10% or more of the voting stock) from the date of grant. The 2004 Plan was terminated on the effective date of 2017 Amended and Restated Equity Incentive Plan, and accordingly, no shares are available for issuance under the 2004 Plan. The 2004 Plan continues to govern outstanding awards granted thereunder. 2017 Amended and Restated Equity Incentive Plan In 2017, the Company approved the 2017 Amended and Restated Equity Incentive Plan, or the 2017 Plan, under which the Board of Directors may grant and incentive stock options to employees and nonstatutory stock options, stock appreciation rights, restricted stock, or RSAs, and restricted stock units, or RSUs, to employees, members of the Board of Directors and consultants of the Company and its subsidiaries. Under the 2017 Plan, incentive stock options and nonstatutory stock options may be granted at a price not less than fair value (110% of fair value for options issued to holders of 10% or more of voting stock). Stock appreciation rights may be granted at a price not less than fair value. Fair value is determined by the Board of Directors. Options are exercisable over periods not to exceed 10 years (five years for incentive stock options granted to holders of 10% or more of the voting stock) from the date of grant. In connection with the Direct Listing, the 2017 Plan was terminated effective immediately prior to the effectiveness of the 2020 Equity Incentive Plan, and accordingly, no shares are available for issuance under the 2017 Plan. The 2017 Plan continues to govern outstanding awards granted thereunder. 2020 Equity Incentive Plan In 2020, the Company approved the 2020 Equity Incentive Plan, or the 2020 Plan, which became effective on the business day immediately prior to the effective date of the registration statement for the Company’s Direct Listing. Under the 2020 Plan, the Board of Directors may grant incentive stock options to employees and stock appreciation rights, restricted stock, or RSAs, and restricted stock units, or RSUs, performance units and performance shares to employees, members of the Board of Directors and consultants of the Company and its subsidiaries. Under the 2020 Plan, incentive stock options, nonstatutory stock options, and stock appreciation rights may be granted at a price not less than 100% of the fair market value of the underlying common stock on the date of grant (110% of fair value for incentive stock options issued to holders of 10% or more of voting stock). Options and stock appreciation rights are exercisable over a period not to exceed 10 years (five years for incentive stock options granted to holders of 10% or more of the voting stock) from the date of grant. 60.0 million shares of Class A common stock are reserved for future issuance under the 2020 Plan. Stock-based awards under the 2020 Plan that expire or are forfeited, cancelled, or repurchased generally are returned to the pool of shares of Class A common stock available for issuance under the 2020 Plan. The 2020 Plan provides for annual automatic increases in the number of shares of Class A common stock reserved thereunder. In addition, subject to the adjustment provisions of the 2020 Plan, the shares reserved for issuance under the 2020 Plan also includes (i) any shares that, as of the day immediately prior to the effective date of the registration statement, have been reserved but not issued pursuant to any awards granted under the 2017 Plan and are not subject to any awards thereunder and (ii) any shares subject to stock options, RSUs or similar awards granted under our 2017 Plan and 2004 Plan that, after the effective date of the registration statement, expire or otherwise terminate without having been exercised or issued in full, are tendered to or withheld by the Company for payment of an exercise price or for tax withholding obligations, or are forfeited to or repurchased by the Company due to failure to vest. Employee Stock Purchase Plan In 2020, the Company’s board of directors adopted, and its stockholders approved, the 2020 ESPP, which became effective in connection with the Direct Listing. The 2020 ESPP authorizes the issuance of shares of common stock pursuant to purchase rights granted to employees. A total of 6,000,000 shares of the Company’s Class A common stock have been reserved for future issuance under the 2020 ESPP, in addition to any annual automatic increases in the number of shares of Class A common stock reserved for future issuance under the 2020 ESPP. The 2020 ESPP plan is a compensatory plan and includes two components: a component that allows the Company to make offerings intended to qualify under Section 423 of the Code and a component that allows the Company to make offerings not intended to qualify under Section 423 of the Code to designated companies. Subject to any limitations contained therein, the 2020 ESPP allows eligible employees to contribute (in the form of payroll deductions or otherwise to the extent permitted by the administrator) an amount established by the administrator from time to time in its discretion to purchase Class A common stock at a discounted price per share. The price at which Class A common stock is purchased under the 2020 ESPP is equal to 85% of the fair market value of a share of the Company’s Class A common stock on the enrollment date or exercise date, whichever is lower. Offering periods are generally 24 months long and begin on February 25 and August 25 each year with each offering period having four purchase periods of approximately six months each. The initial offering period began on March 10, 2021 and will end on February 27, 2023. Stock-based compensation expense Stock-based compensation expense included in the condensed consolidated statements of operations data above was as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Infrastructure and trust & safety $ 7,797 $ 915 $ 13,485 $ 3,719 Research and development 51,626 3,957 83,220 20,680 General and administrative 18,929 1,872 30,176 20,304 Sales and marketing 3,307 665 5,522 4,963 Total stock-based compensation $ 81,659 $ 7,409 $ 132,403 $ 49,666 The stock-based compensation expense related to equity awards granted to non-employees for the three and six months ended June 30, 2021 and 2020 was not material. Options Future stock-based compensation for unvested options granted and outstanding as of June 30, 2021 is $200.0 million to be recognized over a weighted-average remaining requisite service period of 3.1 years. The following table summarizes the Company’s stock option activity: Options Outstanding Number of Weighted- Remaining Aggregate (in thousands) (in thousands) Balances as of December 31, 2020 98,502 $ 2.55 7.76 $ 3,838,994 Granted — — Cancelled (1,119) $ 3.88 Exercised (24,139) $ 1.73 Balances as of June 30, 2021 73,244 $ 2.79 7.46 $ 6,385,925 Exercisable as of June 30, 2021 34,089 $ 1.58 6.46 $ 3,013,482 Vested and expected to vest at June 30, 2021 73,244 $ 2.79 7.46 $ 6,385,925 No options were granted during the three and six months ended June 30, 2021. The following table summarizes the Company’s restricted stock units and unregistered restricted stock awards (unregistered RSAs) activity: Restricted Stock Units Restricted Stock Awards Number of Weighted- Number of Weighted- (in thousands) (in thousands) Unvested as of December 31, 2020 3,061 $ 31.55 388 $ 37.75 Granted 7,126 $ 77.21 — — Released (3) $ 77.00 (32) $ 37.75 Cancelled (92) $ 32.01 — — Unvested as of June 30, 2021 10,092 $ 63.69 356 $ 37.75 As of June 30, 2021, the Company had $7.5 million of unrecognized stock-based compensation related to unregistered RSAs, which will be recognized over the weighted average remaining requisite service period of 2.4 years. As of June 30, 2021, the Company had $562.7 million of unrecognized stock-based compensation related to RSUs, which will be recognized over the weighted average remaining requisite service period of 3.6 years. The RSUs granted prior to our Direct Listing vest upon the satisfaction of both the service condition and a liquidity event-related performance vesting condition which was satisfied on the Effective Date. In the first quarter of 2021, we recorded cumulative stock-based compensation expense of $21.3 million related to all then-outstanding RSUs for which the service-based vesting condition has been satisfied. Stock-based compensation related to the remaining service-based period after the liquidity event-related performance vesting condition was satisfied will be recorded over the remaining requisite service period using the accelerated attribution method. The RSUs granted subsequent to our Direct Listing only have a service based vesting condition, which is satisfied generally over four years. CEO Long-Term Performance Award In February 2021, the compensation committee granted the CEO a Long-Term Performance Award, an RSU award under our 2017 Plan to Mr. Baszucki, which would provide him the opportunity to earn a maximum number of 11,500,000 shares of Class A common stock. The CEO Long-Term Performance Award vests upon the satisfaction of a service condition and achievement of certain stock price goals, as described below. The CEO Long-Term Performance Award is eligible to vest based on the Company’s stock price performance over performance periods with the first beginning two years after the Effective Date and ending on the seventh anniversary of the Effective Date. In addition, and as described in greater detail below, Mr. Baszucki must remain employed as our CEO through the date a Company Stock Price Hurdle is achieved in order to earn the RSUs that relate to an applicable Company Stock Price Hurdle. The CEO Long-Term Performance Award is divided into seven tranches that are eligible to vest based on the achievement of stock price goals, each a Company Stock Price Hurdle, measured based on an average of our stock price over a consecutive 90-day trading period applicable to the performance period as set forth below. Company Stock Number of RSUs Performance 1 $ 165.00 750,000 2 years 2 $ 200.00 750,000 3 years 3 $ 235.00 2,000,000 4 years 4 $ 270.00 2,000,000 5 years 5 $ 305.00 2,000,000 5 years 6 $ 340.00 2,000,000 5 years 7 $ 375.00 2,000,000 5 years If the Company Stock Price Hurdle fails to reach $165.00 prior to the seventh anniversary of the Effective Date, no portion of the CEO Long-Term Performance Award will vest. Further, any RSUs associated with a Company Stock Price Hurdle not achieved by the seventh anniversary of the Effective Date will terminate and be cancelled for no additional consideration to Mr. Baszucki. Mr. Baszucki must remain employed by us as our CEO from the Effective Date through the date a Company Stock Price Hurdle is achieved to earn the RSUs associated with an applicable Company Stock Price Hurdle. The Company Stock Price Hurdles and Number of RSUs Eligible to Vest will be adjusted to reflect any stock splits, stock dividends, combinations, reorganizations, reclassifications, or similar events under the 2017 Plan. Each vested RSU under the CEO Long-Term Performance Award will be settled in a share of our Class A common stock on the next company quarterly settlement date occurring on or after the date on which the RSU vests, regardless of whether Mr. Baszucki remains the CEO as of such date. Company quarterly settlement dates for this purpose are February 20, May 20, August 20, and November 20. The Company estimated the grant date fair value of the CEO Long-Term Performance Award using a model based on multiple stock price paths developed through the use of a Monte Carlo simulation that incorporates into the valuation the possibility that the Company Stock Price Hurdles may not be satisfied. The weighted-average grant date fair value of the CEO Long-Term Performance Award was estimated to be $20.19 per share, and the Company estimates that it will recognize total stock-based compensation expense of approximately $232.2 million over the derived service period of each of the seven separate tranches which is between 3.45 – 5.38. If the Company Stock Price Hurdles are met sooner than the derived service period, the stock-based compensation expense will be adjusted to reflect the cumulative expense associated with the vested award. The stock-based compensation expense will be recognized if service as the Company’s CEO is provided by Mr. Baszucki over the requisite service period, regardless of whether the Company Stock Price Hurdles are achieved. The Company recorded $12.2 million and $17.4 million of stock-based compensation expense related to the CEO Long-term Performance Award during the three and six months ended June 30, 2021. As of June 30, 2021, unrecognized stock-based compensation expense related to the CEO Long-term Performance Award was $214.8 million which will be recognized over the remaining derived service period of the respective tranche. Employee Stock Purchase Plan The following table summarizes the weighted-average assumptions used in estimating the fair value of 2020 ESPP for the initial offering period using the Black-Scholes option-pricing model: Six Months Ended June 30, 2021 Risk-free interest rate 0.06% - 0.15% Expected volatility 53.77% - 56.9% Dividend yield —% Expected terms (in years) 0.44 - 1.95 The Company recorded $2.9 million and $3.4 million of stock-based compensation expense related to the 2020 ESPP during the three and six months ended June 30, 2021, respectively. Tender Offer In March 2020, in connection with the Company’s sale of the Series G convertible preferred stock, the purchasers of the Series G convertible preferred stock conducted a tender offer to acquire approximately 31.1 million shares of common and 24.0 million shares of convertible preferred stock from employees, former employees, and other existing investors. In connection with the tender offer, the Company waived any rights of first refusal or other transfer restrictions applicable to such shares. As a result of this transaction, we recorded a total of $35.2 million in stock-based compensation expense in the year ended December 31, 2020 for the difference between the price paid for shares held by our employees and former employee stockholders and the estimated fair market value on the date of the transaction.

Employee Benefit Plan

Employee Benefit Plan	6 Months Ended
Employee Benefit Plan	Jun. 30, 2021
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanThe Company sponsors a 401(k) defined contribution retirement plan for eligible employees. Under the plan, the Company is required to make a safe harbor contribution of 100% of the employee contributions on the first 3% and 50% of the next 2% for each employee, subject to a maximum total contribution mandated by the IRS. The Company made matching contributions in the amount of $2.3 million and $4.2 million for the three and six months ended June 30, 2021, respectively and $1.1 million and $2.1 million for the three and six months ended June 30, 2020, respectively.

Joint Venture

Joint Venture	6 Months Ended
Joint Venture	Jun. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Joint Venture	Joint Venture In February 2019, the Company entered into a joint venture agreement with Songhua River Investment Limited, or Songhua, an affiliate of Tencent Holdings Ltd., or Tencent, to create Roblox China Holding Corp. (in which Roblox holds a 51% ownership interest). Songhua contributed $50 million in capital in exchange for 49% ownership interest. The business of the joint venture is (either directly or indirectly through the joint venture’s wholly owned subsidiaries) to engage in the development, localization and licensing to Tencent of the Roblox Platform for operation and publication as a game in China, and development, localization and licensing to creators of a Chinese version of the Roblox Studio and also develop and oversee relations with local Chinese developers. Pursuant to the terms of the agreements and ASC 810 “Consolidation,” the joint venture is consolidated with the Company because the Company maintains control through voting rights and the minority member of the joint venture does not have substantive participating rights, or veto rights. As a result, it was determined that the Company has control sufficient to consolidate the operations of the joint venture. The Company classifies the 49% ownership interest held by Songhua as noncontrolling interest on the condensed consolidated balance sheet.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesThe Company is subject to income tax in the United States as well as other tax jurisdictions in which it conducts business. Earnings from non-U.S. activities are subject to local country income tax. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries as such earnings are to be reinvested indefinitely.The Company recorded an immaterial income tax provision during the three and six months ended June 30, 2021 and 2020, respectively, related to foreign income taxes. Based on the available objective evidence during the three and six months ended June 30, 2021, the Company believes it is more likely than not that the tax benefits of U.S. and certain foreign losses incurred during the three and six months ended June 30, 2021 and 2020, respectively, may not be realized. Accordingly, the Company did not record the tax benefits of U.S. and certain losses incurred during the three and six months ended June 30, 2021 and 2020, respectively. The primary difference between the effective tax rate and the statutory tax rate relates to the valuation allowance on the U.S. and certain foreign losses and foreign tax rate differences.

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Common Share	6 Months Ended
Basic and Diluted Net Loss Per Common Share	Jun. 30, 2021
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Common Share	Basic and Diluted Net Loss Per Common Share Basic and diluted net loss per share attributable to common stockholders is computed in conformity with the two-class method required for participating securities. Prior to the automatic conversion of all of its convertible preferred stock outstanding into Class A common stock upon the completion of the Direct Listing, the Company considered all series of its convertible preferred stock to be participating securities as the holders of such stock had the right to receive nonforfeitable dividends on a pari passu basis in the event that a dividend was paid on common stock. Under the two-class method, the net loss attributable to common stockholders is not allocated to the convertible preferred stock as the preferred stockholders do not have a contractual obligation to share in the Company’s losses. Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares of common stock used to calculate basic net loss per share of common stock excludes those shares subject to repurchase related to stock options or unregistered restricted stock awards that were exercised or issued prior to vesting as these shares are not deemed to be issued for accounting purposes until they vest. Diluted net loss per share is computed by giving effect to all potentially dilutive common stock equivalents to the extent they are dilutive. For purposes of this calculation, convertible preferred stock, stock options, unregistered restricted stock awards, convertible preferred stock warrants, common stock warrants, and purchase rights under the 2020 ESPP are considered to be common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is anti-dilutive for all periods presented. The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Basic and diluted net loss per share Numerator Net loss $ (142,930) $ (72,263) $ (279,033) $ (147,140) Less: net loss attributable to noncontrolling interest (2,796) (742) (4,682) (1,240) Net loss attributable to common stockholders $ (140,134) $ (71,521) $ (274,351) $ (145,900) Denominator Weighted-average common shares used in per share computation, basic and diluted 571,300 180,336 432,159 174,939 Net loss per share, basic and diluted $ (0.25) $ (0.40) $ (0.63) $ (0.83) The potential shares of common stock that were excluded from the computation of diluted net loss per share for the three and six months ended June 30, 2021 and June 30, 2020 because including them would have been anti-dilutive are as follows (in thousands): As of Three and Six Months ended 2021 2020 Stock options outstanding 73,244 91,866 RSUs outstanding 10,092 — Stock warrants outstanding 324 260 Convertible Preferred Stock outstanding — 349,522 Unregistered restricted stock awards outstanding 356 — 2020 ESPP 731 — Total 84,747 441,648

Subsequent Events

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 11, 2021, the Company signed a definitive purchase agreement to acquire Guilded, Inc. (“Guilded”) for a purchase price of approximately $90.0 million to be paid in cash and stock. The acquisition closed on August 16, 2021. Guilded, a privately held company, is a platform for connecting gaming communities. The Company is currently evaluating the valuation and the related accounting. It is not practicable to disclose the preliminary purchase price allocation for this transaction, given the short period of time between the closing of the transaction and the issuance of these condensed consolidated financial statements.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Fiscal Year	Fiscal Year The Company’s fiscal year ends on December 31. For example, references to fiscal 2021 and 2020 refer to the fiscal year ending December 31, 2021 and December 31, 2020, respectively.
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Accordingly, they do not include all disclosures normally required in annual consolidated financial statements prepared in accordance with GAAP. Therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s final prospectus dated March 2, 2021 (“Effective Date”) and filed with the SEC pursuant to Rule 424(b)(4) on March 10, 2021 (“Final Prospectus”). In our opinion, the information contained herein reflects all adjustments necessary for a fair presentation of our results of operations, financial position, cash flows, and stockholders’ equity. All such adjustments are of a normal, recurring nature. The results of operations for the three and six months ended June 30, 2021 shown in this report are not necessarily indicative of the results to be expected for the full year ending December 31, 2021 or any other period. There have been no material changes in our significant accounting policies as described in our consolidated financial statements for the year ended December 31, 2020 included in the Final Prospectus, other than the adoption of accounting pronouncements as described below under the heading “Leases” and in Note 3, “Recent Accounting Pronouncements,” of the Notes to Condensed Consolidated Financial Statements. Certain reclassifications have been made to prior period balances in order to conform to the current period presentation within the cash flows from operating activities in the condensed consolidated statements of cash flows. These reclassifications were not material and had no impact on previously reported net cash used in operating activities in the Company’s Condensed Consolidated Statements of Cash Flows for any periods presented.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of the Company and subsidiaries over which the Company has control. All intercompany transactions and balances have been eliminated. The condensed consolidated financial statements include 100% of the accounts of wholly owned and majority owned subsidiaries, and the ownership interest of minority investors is recorded as noncontrolling interest.
Stock Split	Stock Split On January 31, 2020, the Company’s board of directors approved an amendment to its certificate of incorporation to effect a split of shares of the issued and outstanding common stock and convertible preferred stock at a 2-for-1 ratio. The stock split was approved by the Company’s stockholders and effected on January 31, 2020. All issued and outstanding shares of common stock and convertible preferred stock, dividend rates, conversion rates, options to purchase common stock, exercise prices, and the related per-share amounts contained in these condensed consolidated financial statements have been adjusted to reflect these stock splits for all periods presented.
Segments	Segments The Company operates as a single operating segment. The chief operating decision maker of the Company is its Chief Executive Officer (“CEO”), who makes resource allocation decisions and assesses performance based on financial information presented on a consolidated basis, accompanied by disaggregated information of our revenue. Accordingly, the Company has determined that it has a single reportable segment and operating segment structure.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. The Company bases its estimates on historical experience and also on assumptions that management considers reasonable. Significant estimates and assumptions reflected in the condensed consolidated financial statements include, but are not limited to, the estimated period of time the virtual items are available to the user and the estimated consumable and durable virtual items purchased for which the Company lacks specific information that we use for revenue recognition, useful lives of property and equipment and intangible assets, valuation of acquired goodwill and intangible assets, accrued liabilities (including accrued developer exchange fees), contingent liabilities, valuation of deferred tax assets and liabilities, stock-based compensation, the carrying value of operating lease right-of-use assets and evaluation of recoverability of long-lived assets. The Company assesses these estimates on a regular basis; however, actual results could differ materially from these estimates. Management believes that the estimates, and judgments upon which they rely, are reasonable based upon information available to them at the time that these estimates and judgments are made. To the extent that there are material differences between these estimates and actual results, the Company’s consolidated financial statements will be affected. The novel coronavirus, or COVID-19, pandemic has created, and may continue to create, significant uncertainty in macroeconomic conditions. The full extent to which the COVID-19 pandemic will directly or indirectly impact the global economy, the lasting social effects, and impact on the Company’s business, results of operations, and financial condition will depend on future developments, such as COVID-19 vaccination rates and the availability of COVID-19 vaccines both globally and in the U.S., that are highly uncertain and cannot be accurately predicted. As of the date of issuance of the condensed consolidated financial statements, the Company is not aware of any specific event of circumstance related to COVID-19 that would require it to update its estimates or judgments or adjust the carrying value of its assets or liabilities. Actual results could differ from those estimates and any such differences may be material to the condensed consolidated financial statements. As events continue to evolve and additional information becomes available, the Company’s estimates and assumptions may change materially in future periods.
Concentration of Credit Risk and Significant Customers	Concentration of Credit Risk and Significant Customers —Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivables. Cash and cash equivalents are deposited with high quality financial institutions and may, at times, exceed federally insured limits. Management believes that the financial institutions that hold the Company’s deposits are financially credit worthy and, accordingly, minimal credit risk exists with respect to those balances. Generally, these deposits may be redeemed upon demand and, therefore, bear minimal interest rate risk. The Company provides credit, in the normal course of business, to various customers, performs ongoing credit evaluations of its customers, and maintains allowances for potential credit losses on customers’ accounts when deemed necessary. The Company has not experienced any material credit losses to date. The Company uses various distribution channels to collect payments from users. As of June 30, 2021, and December 31, 2020, two distribution channels accounted for 64% and 50% of our accounts receivable, respectively. One of the distribution channels accounted for 45% and 25% of our accounts receivable as of June 30, 2021 and December 31, 2020, respectively. The second distribution channel accounted for 19% and 25% of our accounts receivable as of June 30, 2021 and December 31, 2020, respectively.
Revenue Recognition	Revenue Recognition Revenue Recognition Policy In accordance with Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 606”) , revenue is recognized when control of the service is transferred to the customer. The amount of revenue recognized reflects the consideration that we expect to be entitled to in exchange for these services. To achieve the core principle of this standard, we determine revenue recognition by: • identifying the contract, or contracts, with the customer; • identifying the performance obligations in the contract; • determining the transaction price; • allocating the transaction price to performance obligations in the contract; and • recognizing revenue when, or as, we satisfy performance obligations by transferring the promised services. We derive substantially all of our revenue from the sale of virtual items on the Roblox Platform. Roblox Platform We operate the Roblox Platform as live services that allow users to play and socialize with others for free. Within the experience, however, users can purchase virtual currency (Robux) to obtain virtual items to enhance their social experience. Proceeds from the sale of Robux are initially recorded in deferred revenue and recognized as revenues as a user purchases and consumes virtual items. Our identified performance obligation is to provide users with the ability to acquire, use, and hold virtual items on the Roblox Platform over the estimated period of time the virtual items are available to the user or until the virtual items are consumed. Users can purchase Robux, as one-time purchases or through monthly subscriptions via mobile payments, credit cards, or prepaid cards. Payments from users are non-refundable and relate to non-cancellable contracts for a fixed price that specify our obligations. Revenue is recorded net of taxes, assessed by a government authority that are both imposed on and concurrent with specific revenue transactions between us and our users, and estimated chargebacks. Such payments are initially recorded to deferred revenue. The satisfaction of our performance obligation is dependent on the nature of the virtual item purchased and as a result, we categorize our virtual items as either consumable or durable • Consumable virtual items represent items that can be consumed by a specific user action. Common characteristics of consumable virtual items may include items that are no longer displayed on the user’s inventory after a short period of time or do not provide the user any continuing benefit following consumption. For the sale of consumable virtual items we recognize revenue as the items are consumed. • Durable virtual items represent items which result in a persistent change to a users’ character or item set (e.g., virtual hat, pet, or house). These items are generally available to the customer to hold, use, or display for as long as they are on our Roblox Platform. We recognize revenue from the sale of durable virtual items ratably over the estimated period of time the items are available to the user which is estimated as the average lifetime of a paying user. To separately account for consumable and durable virtual items, the Company specifically identifies each purchase for the majority of virtual items purchased on the Roblox Platform. For the remaining population, the Company estimates the amount of consumable and durable virtual items purchased based on data from specifically identified purchases and the expected behavior of the users within similar experiences. The average lifetime of a paying user estimate is calculated based on historical monthly retention data for each user cohort to project future participation on the Roblox Platform and is currently estimated to be 23 months. Determining the estimated average lifetime of a paying user requires management’s judgment. The Company considers results from prior analyses and trends in the activity of the Company’s recent user cohorts in determining the estimated average lifetime of a paying user. The Company believes this estimate is the best representation of the average life of the durable virtual items. Principal Agent Considerations The Company evaluates the sales of Robux via third-party payment processors to determine whether its revenues should be reported gross or net of fees either retained by the payment processor or paid to the developers and creators (“Developer Exchange Fees”). The Company is the principal in the transaction with the end user as a result of controlling, hosting, and integrating the delivery of the virtual items to the end user. The Company records revenue gross as a principal and records fees paid to payment processors and Developer Exchange Fees as an expense. Other Revenue Other revenue primarily consists of revenue from advertising, licenses, and royalties. The Company recognizes revenue based on the performance obligations of the underlying agreements, in an amount that reflects the consideration that the Company expects to be entitled to.
Stock Based Compensation	Stock Based Compensation The Company measures and recognizes compensation expense for all stock-based awards, including stock options, restricted stock awards (“RSAs”), restricted stock units (“RSUs”), performance stock units (“PSUs”) granted to employees, directors, and non-employees, and stock purchase rights granted under the 2020 Employee Stock Purchase Plan (“2020 ESPP”) to employees, based on the estimated fair value of the awards on the date of grant. The fair value of each stock option granted and stock purchase right granted under the 2020 ESPP is estimated using the Black-Scholes option-pricing model and is recognized as compensation expense on a straight-line basis over the requisite service period. The Black-Scholes option pricing model requires certain subjective inputs and assumptions, including the fair value of the Company’s Class A common stock, the expected term, risk-free interest rates, expected stock price volatility, and expected dividend yield of the Company’s Class A common stock. The assumptions used to determine the fair value of the option awards represent management’s best estimates. These estimates involve inherent uncertainties and the application of management’s judgment. These assumptions and estimates are as follows: • Fair value of Class A common stock— Prior to the Direct Listing, the fair value of the shares of Class A common stock underlying the stock options has historically been determined by the Company’s board of directors along with management as there was no public market for the underlying common stock. The Company’s board of directors along with management determined the fair value of the Company’s common stock by considering a number of objective and subjective factors including: contemporaneous third-party valuations of its common stock, the valuation of comparable companies, sales of the Company’s common and convertible preferred stock to outside investors in arms-length transactions, the Company’s operating and financial performance, the lack of marketability, and the general and industry specific economic outlook, amongst other factors. After the completion of the Direct listing, the fair value of the Company’s Class A common stock is determined based on the NYSE closing price on the date of grant. • Expected term—The expected term represents the period stock-based awards are expected to be outstanding. The expected term assumptions are determined based on the vesting terms, estimated exercise behavior, post-vesting cancellations and contractual lives of the awards. • Risk-free interest rates—The risk-free interest rate is based on the implied yields in effect at the time of the grant of U.S. Treasury notes with terms approximately equal to the expected term of the award. • Expected stock price volatility— Prior to the Direct Listing, the Company used the historical volatility of the stock price of similar publicly traded peer companies. After the completion of the Direct Listing the Company continues to use the historical volatility of the stock price of similar publicly traded peer companies since it has not established sufficient public trading history. • Expected dividend yield—The Company utilized a dividend yield of zero, as it had no history or plan of declaring dividends on its common stock. RSUs granted by the Company prior to March 2021, vest upon the satisfaction of both a service-based vesting condition, which is typically four years, and a liquidity event-related performance vesting condition. The liquidity event-related performance vesting condition was satisfied on the Effective Date, and the Company recorded a cumulative stock-based compensation expense as of the Direct Listing date for those RSUs for which the service-based vesting condition has been satisfied. Stock-based compensation related to the remaining service-based period after the liquidity event-related performance vesting condition was satisfied will be recorded over the remaining requisite service period using the accelerated attribution method. Since March 2021, the Company only granted RSUs that vest upon the satisfaction of a service-based vesting condition and the compensation expense for these RSUs is recognized on a straight-line basis over the requisite service period. In February 2021, the compensation committee of the Company’s board of directors granted the CEO a Long-Term Performance Award (“CEO Long-Term Performance Award”), an RSU award that includes a service and a market condition. The fair value of the CEO Long-Term Performance Award is determined using a Monte Carlo simulation model. The associated stock-based compensation is recorded over the derived service period, using the accelerated attribution method. If the stock price goals are met sooner than the derived service period, the Company will adjust the stock-based compensation expense to reflect the cumulative expense associated with the vested portion of the CEO Long-Term Performance Award. Provided that David Baszucki continues to be the CEO of the Company, stock-based compensation expense is recognized over the derived service period, regardless of whether the stock price goals are achieved. The Company records forfeitures when they occur for all stock-based awards.
Leases	Leases Effective January 1, 2021, the Company adopted Accounting Standards Update (“ASU”) No. 2016-02, “Leases (Topic 842)” (“Topic 842”) along with all subsequent ASU clarifications and improvements that are applicable to the Company on January 1, 2021 utilizing the modified retrospective transition method, which requires a cumulative-effect adjustment, if any, to the opening balance of retained earnings to be recognized on the date of adoption with prior periods not restated. The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one to 10 years and contain leasehold improvement incentives, rent holidays and escalation clauses. In addition, some of these leases have renewal options for up to five years after expiration of the initial term. The Company determines if an arrangement contains a lease at inception. The Company determines if a contract contains a lease based on whether we have the right to obtain substantially all of the economic benefits from the use of an identified asset and whether we have the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which we do not own. Operating lease right-of-use (“ROU”) assets represent our right to use an underlying asset for the lease term. Operating lease liabilities represent our obligation to make lease payments arising from the lease at the commencement date and are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. Operating lease ROU assets are recognized as the lease liability, adjusted for lease incentives received, initial direct costs and prepayments made. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date to calculate the present value of future payments. The incremental borrowing rate represents the rate of interest the Company would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. The concluded incremental borrowing rate for each respective term was derived using a synthetic credit rating established for the Company and applying it to arrive at corporate bond yields with a credit rating similar to the Company. Certain lease agreements include options to renew or terminate the lease, and such option is factored into determination of the lease term and future lease payments when it is reasonably certain that the Company will exercise the option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. Variable lease payments are expensed as incurred and are not included within the ROU asset and lease liability calculation. Variable lease payments primarily include reimbursements of costs incurred by lessors for common area maintenance and utilities. The Company subleases certain real estate under agreements that are classified as operating leases. Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company does not account for lease components (e.g., fixed payments including rent) separately from the non-lease components (e.g., common-area maintenance costs). See Note 5, “Leases” to the Notes to Condensed Consolidated Financial Statements for more information.
Recent Accounting Pronouncements	Recent Accounting Pronouncements JOBS Act Accounting Election We are an emerging growth company, as defined in the Jumpstart Our Business Startups (JOBS) Act. The JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This provision allows an emerging growth company to delay the adoption of some accounting standards until those standards would otherwise apply to private companies. We have elected to use the extended transition period under the JOBS Act for the adoption of certain accounting standards until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our condensed consolidated financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates. The adoption dates discussed below reflect this election. Accounting Pronouncements Recently Adopted In February 2016, the FASB issued ASU No. 2016-02, Topic 842, which amends the existing accounting standards for leases. The new standard requires lessees to record a right-of-use asset and a corresponding lease liability on the balance sheet (with the exception of short-term leases). For lessees, leases will continue to be classified as either operating or financing in the income statement. The Company adopted the guidance on January 1, 2021 utilizing the modified retrospective transition method through a cumulative-effect adjustment at the beginning of the first quarter of 2021. The Company elected the package of practical expedients permitted under the transition guidance, which allowed the Company to carryforward its historical lease classification, assessment on whether a contract was or contains a lease, and initial direct costs for leases that existed prior to January 1, 2021. The Company also elected to combine its lease and non-lease components and not recognize ROU assets and lease liabilities for leases with an initial term of 12 months or less. The Company did not elect to apply the hindsight practical expedient when determining lease term and assessing impairment of ROU assets. See Note 5, “Leases” to the Notes to Condensed Consolidated Financial Statements for more information. In August 2018, the FASB issued ASU No. 2018-15, “ Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ,” which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new standard requires capitalized costs to be amortized on a straight-line basis generally over the term of the arrangement, and the financial statement presentation for these capitalized costs would be the same as that of the fees related to the hosting arrangements. This new guidance was effective for the Company beginning on January 1, 2021, the effective date and did not have a material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”). The purpose of ASU 2019-12 is to reduce complexity in the accounting standards for income taxes by removing certain exceptions as well as clarifying certain allocations. This update removed the exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operation and income or a gain from other items (for example, discontinued operations or other comprehensive income). This update also addresses the split recognition of franchise taxes that are partially based on income between income-based tax and non-income-based tax. This guidance is effective for fiscal years beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. Early adoption is permitted. The Company elected to adopt ASU 2019-12 on January 1, 2021. The adoption of ASU 2019-12 did not have a material impact on the Company’s condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ” (“Topic 326”) which replaces the existing incurred loss impairment model with an expected credit loss model and requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. The guidance will be effective for the Company beginning January 1, 2023, and interim periods therein. Early adoption is permitted. The amendments in this update should be applied on a modified-retrospective basis by means of a cumulative-effect adjustment to the opening balance of retained earnings balance in the statement of financial position as of the date that the Company adopts the amendments. The Company is currently evaluating the effect that Topic 326 may have on its consolidated financial statements and related disclosures.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
Revenue from Contracts with Customers (Tables)	Jun. 30, 2021
Disaggregation of Revenue [Abstract]
Summary of Revenue Disaggregated By Geography	The following table summarizes revenue by region based on the billing country of users: Three Months Ended June 30, 2021 2020 Amount Percentage Amount Percentage United States and Canada ( 1) $ 309,203 68 % $ 139,769 70 % Europe 85,042 19 36,021 18 Asia-Pacific, including Australia and New Zealand 33,050 7 15,263 8 Rest of world 26,805 6 9,339 4 Total $ 454,100 100 % $ 200,392 100 % Six Months Ended June 30, 2021 2020 Amount Percentage Amount Percentage United States and Canada ( 1) $ 573,711 68 % $ 252,417 70 % Europe 157,644 19 64,441 18 Asia-Pacific, including Australia and New Zealand 61,362 7 27,957 8 Rest of world 48,359 6 17,147 4 Total $ 841,076 100 % $ 361,962 100 % (1) The Company’s net revenues in the U.S. were 64% of consolidated net revenues for each of the three and six months ended June 30, 2021, and 65% for each of the three and six months ended June 30, 2020.

Leases (Tables)

Leases (Tables)	6 Months Ended
Leases (Tables)	Jun. 30, 2021
Leases [Abstract]
Summary of Company's Consolidated Balance Sheet	The following table summarizes the impacts of adopting Topic 842 on the Company’s consolidated balance sheet as of December 31, 2020 (in thousands): As Reported Balance as of December 31, 2020 Adjustments due As Adjusted Balance Assets Operating lease right-of-use assets — $ 195,944 $ 195,944 Prepaid expenses and other current assets 26,274 (8,106) 18,168 Total $ 26,274 $ 187,838 $ 214,112 Liabilities Accrued expenses and other current liabilities $ 65,392 $ (1,704) $ 63,688 Other long-term liabilities 22,109 (21,983) 126 Operating lease liabilities—short-term — 32,162 32,162 Operating lease liabilities—long-term — 179,363 179,363 Total $ 87,501 $ 187,838 $ 275,339
Summary of Non-cancelable Operating Leases	The following table presents maturity of lease liabilities under the Company’s non-cancelable operating leases as of June 30, 2021 (in thousands): Remainder of 2021 $ 26,944 2022 55,855 2023 50,220 2024 41,414 2025 34,860 Thereafter 78,423 Total lease payments $ 287,716 Less: interest(1) 36,000 Present value of lease liabilities $ 251,716 (1) Calculated using the interest rate for each lease.
Summary of Supplemental Information	The following table presents supplemental information for the six months ended June 30, 2021 (in thousands, except for weighted average and percentage data): Weighted average remaining lease term 6.22 Weighted average discount rate 4.0 % Cash paid for amounts included in the measurement of lease liabilities (1) $ 25,141 Lease liabilities arising from obtaining new ROU assets $ 53,554 (1) Does not include $8.1 million of leasehold incentives received from the landlord.
Summary of Future Minimum Lease Payments	Prior to the adoption of Topic 842, future minimum lease payments as of December 31, 2020, which were undiscounted, were as follows (in thousands): 2021 $ 51,397 2022 54,477 2023 47,915 2024 38,970 2025 32,223 Thereafter 55,882 Total lease payments $ 280,864

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Summary of Assets, Related to Our Financial Instruments, Measured at Fair Value on Recurring Basis	A summary of assets, related to our financial instruments, measured at fair value on a recurring basis, is set forth below (in thousands): Fair Value As of Financial Instrument Fair Value June 30, December 31, Financial Assets: Money Market funds classified as cash equivalents Level 1 $ 1,513,136 $ 310,392

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
Acquisitions (Tables)	Jun. 30, 2021
Business Combinations [Abstract]
Summary of Aggregate Purchase Consideration	The aggregate purchase consideration for Loom.ai was comprised of the following (in thousands): Fair Value Cash paid $ 45,998 Common stock issued 35,203 Replacement awards attributable to pre-acquisition service 5,493 Total purchase price $ 86,694
Summary of Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the fair values of the assets acquired and liabilities assumed as of the acquisition date (in thousands): December 11, 2020 Cash and cash equivalents $ 5,080 Prepaid expenses and other current assets 45 Goodwill 59,568 Identified intangible asset—developed technology 29,000 Deferred tax liabilities (6,681) Accrued expenses and other current liabilities (318) Total purchase price $ 86,694

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
Goodwill and Intangible Assets (Tables)	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table represents the changes to goodwill during the six months ended June 30, 2021 (in thousands): Carrying Balance as of December 31, 2020 $ 59,568 Addition from acquisition — Balance as of June 30, 2021 $ 59,568
Schedule of Finite-Lived Intangible Assets	The following tables present details of the Company’s intangible assets as of June 30, 2021 and December 31, 2020 (in thousands, except for weighted average data): As of June 30, 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Weighted Average Remaining Useful Life (in Years) Intangible assets with finite lives Developed Technology $ 42,959 (5,454) $ 37,505 4.4 Total Intangible Assets $ 42,959 (5,454) $ 37,505 As of December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Weighted Average Remaining Useful Life (in Years) Intangible assets with finite lives Developed Technology $ 42,959 $ (1,206) $ 41,753 4.9 Total Intangible Assets $ 42,959 $ (1,206) $ 41,753
Schedule of Expected Future Amortization Expenses Related to the Intangible Assets	The expected future amortization expenses related to the intangible assets as of June 30, 2021 were as follows (in thousands): Remainder of 2021 $ 4,248 2022 8,495 2023 8,495 2024 8,401 2025 7,866 Thereafter — Total remaining amortization $ 37,505

Other Balance Sheet Components

Other Balance Sheet Components (Tables)	6 Months Ended
Other Balance Sheet Components (Tables)	Jun. 30, 2021
Other Balance Sheet Components [Abstract]
Summary of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): As of, June 30, December 31, Prepaid Expenses $ 40,207 $ 17,606 Other current assets 5,225 8,668 Total prepaid expenses and other current assets $ 45,432 $ 26,274
Summary of Property And Equipment, Net	Property and equipment, net, consisted of the following (in thousands): As of, June 30, December 31, Servers and related equipment $ 300,784 $ 264,994 Computer hardware and software 5,985 3,498 Furniture and fixtures 162 162 Leasehold improvement 28,754 27,437 Construction in progress 1,723 294 Total property and equipment $ 337,408 $ 296,385 Less accumulated depreciation and amortization (118,827) (89,970) Property and equipment—net $ 218,581 $ 206,415
Summary of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): As of, June 30, December 31, General accrued expenses $ 94,731 $ 41,699 Short term operating lease liabilities 45,340 — Other current liabilities 42,013 23,693 Total accrued expenses and other current liabilities $ 182,084 $ 65,392

Convertible Preferred Stock (Ta

Convertible Preferred Stock (Tables)	6 Months Ended
Convertible Preferred Stock (Tables)	Jun. 30, 2021
Convertible Preferred Stock [Abstract]
Summary of Convertible Preferred Stock Outstanding	The following table summarizes the convertible preferred stock outstanding immediately prior to the conversion into common stock, and the rights and preferences of the Company’s respective series preceding the Direct Listing in March 2021 (in thousands except per share data): Series Per share Per share Aggregate Carrying Authorized Outstanding A 28,000 16,358 $ 0.02 $ 0.02 $ 327 $ 313 B 45,532 45,532 $ 0.03 $ 0.03 1,070 1,054 C 95,290 95,290 $ 0.03 $ 0.03 2,935 4,150 D 54,860 54,215 $ 0.04 $ 0.04 2,150 2,097 D-1 44,706 44,706 $ 0.09 $ 0.09 4,172 12,998 E 24,340 24,340 $ 1.03 $ 1.03 25,000 24,906 F 33,149 33,149 $ 4.53 $ 4.53 150,000 149,640 G 23,645 23,645 $ 6.34 $ 6.34 150,000 149,669 H 12,222 11,889 $ 45.0 $ 45.0 535,000 534,286 Total 361,744 349,124 $ 870,654 $ 879,113

Stockholders' Equity (Deficit)

Stockholders' Equity (Deficit) (Tables)	6 Months Ended
Stockholders' Equity (Deficit) (Tables)	Jun. 30, 2021
Stockholders' Equity Note [Abstract]
Disclosure Details of Common Stock Shares Available for Future Issuance	The Company had reserved shares of common stock for future issuance as follows (in thousands): As of June 30, December 31, Stock options outstanding 73,244 98,502 RSUs outstanding 10,092 3,061 PSUs outstanding 11,500 — Shares available for issuance under Equity Incentive Plan 58,032 15,448 2020 ESPP 6,000 — Stock Warrants outstanding 324 324 Unregistered restricted stock awards outstanding 356 388 Convertible Preferred Stock outstanding — 337,235 Total 159,548 454,958

Stock-based Compensation (Table

Stock-based Compensation (Tables)	6 Months Ended
Stock-based Compensation (Tables)	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Stock-based Compensation Expense	Stock-based compensation expense included in the condensed consolidated statements of operations data above was as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Infrastructure and trust & safety $ 7,797 $ 915 $ 13,485 $ 3,719 Research and development 51,626 3,957 83,220 20,680 General and administrative 18,929 1,872 30,176 20,304 Sales and marketing 3,307 665 5,522 4,963 Total stock-based compensation $ 81,659 $ 7,409 $ 132,403 $ 49,666
Summary of Summarizes the Company's Stock Option Activity	The following table summarizes the Company’s stock option activity: Options Outstanding Number of Weighted- Remaining Aggregate (in thousands) (in thousands) Balances as of December 31, 2020 98,502 $ 2.55 7.76 $ 3,838,994 Granted — — Cancelled (1,119) $ 3.88 Exercised (24,139) $ 1.73 Balances as of June 30, 2021 73,244 $ 2.79 7.46 $ 6,385,925 Exercisable as of June 30, 2021 34,089 $ 1.58 6.46 $ 3,013,482 Vested and expected to vest at June 30, 2021 73,244 $ 2.79 7.46 $ 6,385,925
Summary of Company's Restricted Stock Units and Unregistered Restricted Stock Awards Activity	The following table summarizes the Company’s restricted stock units and unregistered restricted stock awards (unregistered RSAs) activity: Restricted Stock Units Restricted Stock Awards Number of Weighted- Number of Weighted- (in thousands) (in thousands) Unvested as of December 31, 2020 3,061 $ 31.55 388 $ 37.75 Granted 7,126 $ 77.21 — — Released (3) $ 77.00 (32) $ 37.75 Cancelled (92) $ 32.01 — — Unvested as of June 30, 2021 10,092 $ 63.69 356 $ 37.75
Summary of Measured Based on An Average of Our Stock Price	The CEO Long-Term Performance Award is divided into seven tranches that are eligible to vest based on the achievement of stock price goals, each a Company Stock Price Hurdle, measured based on an average of our stock price over a consecutive 90-day trading period applicable to the performance period as set forth below. Company Stock Number of RSUs Performance 1 $ 165.00 750,000 2 years 2 $ 200.00 750,000 3 years 3 $ 235.00 2,000,000 4 years 4 $ 270.00 2,000,000 5 years 5 $ 305.00 2,000,000 5 years 6 $ 340.00 2,000,000 5 years 7 $ 375.00 2,000,000 5 years
Summary of Employee Stock Purchase Plan	The following table summarizes the weighted-average assumptions used in estimating the fair value of 2020 ESPP for the initial offering period using the Black-Scholes option-pricing model: Six Months Ended June 30, 2021 Risk-free interest rate 0.06% - 0.15% Expected volatility 53.77% - 56.9% Dividend yield —% Expected terms (in years) 0.44 - 1.95

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Common Share (Tables)	6 Months Ended
Basic and Diluted Net Loss Per Common Share (Tables)	Jun. 30, 2021
Earnings Per Share [Abstract]
Summary of Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Basic and diluted net loss per share Numerator Net loss $ (142,930) $ (72,263) $ (279,033) $ (147,140) Less: net loss attributable to noncontrolling interest (2,796) (742) (4,682) (1,240) Net loss attributable to common stockholders $ (140,134) $ (71,521) $ (274,351) $ (145,900) Denominator Weighted-average common shares used in per share computation, basic and diluted 571,300 180,336 432,159 174,939 Net loss per share, basic and diluted $ (0.25) $ (0.40) $ (0.63) $ (0.83)
Summary of Computation of Diluted Net Loss Per Share	The potential shares of common stock that were excluded from the computation of diluted net loss per share for the three and six months ended June 30, 2021 and June 30, 2020 because including them would have been anti-dilutive are as follows (in thousands): As of Three and Six Months ended 2021 2020 Stock options outstanding 73,244 91,866 RSUs outstanding 10,092 — Stock warrants outstanding 324 260 Convertible Preferred Stock outstanding — 349,522 Unregistered restricted stock awards outstanding 356 — 2020 ESPP 731 — Total 84,747 441,648

Organization and Description _2

Organization and Description of Business - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
General and Administrative Expense
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Stock related costs	$ 50.7

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)	Jan. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Stock split, conversion ratio	2
Customer Concentration Risk \| Two Distribution Channels \| Accounts Receivable
Disaggregation of Revenue [Line Items]
Percentage of revenue				64.00%		50.00%
Customer Concentration Risk \| One Distribution Channel \| Accounts Receivable
Disaggregation of Revenue [Line Items]
Percentage of revenue				45.00%		25.00%
Customer Concentration Risk \| One Distribution Channel \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of revenue		35.00%	35.00%	35.00%	34.00%
Customer Concentration Risk \| Second Distribution Channel \| Accounts Receivable
Disaggregation of Revenue [Line Items]
Percentage of revenue				19.00%		25.00%
Customer Concentration Risk \| Second Distribution Channel \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of revenue		19.00%	19.00%	19.00%	18.00%

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Summary of Revenue Disaggregated By Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 454,100	$ 200,392	$ 841,076	$ 361,962
Revenue Benchmark
Disaggregation of Revenue [Line Items]
Revenue	$ 454,100	$ 200,392	$ 841,076	$ 361,962
Revenue Benchmark \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark \| United States and Canada
Disaggregation of Revenue [Line Items]
Revenue	$ 309,203	$ 139,769	$ 573,711	$ 252,417
Revenue Benchmark \| United States and Canada \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	68.00%	70.00%	68.00%	70.00%
Revenue Benchmark \| Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 85,042	$ 36,021	$ 157,644	$ 64,441
Revenue Benchmark \| Europe \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	19.00%	18.00%	19.00%	18.00%
Revenue Benchmark \| Asia-Pacific, including Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenue	$ 33,050	$ 15,263	$ 61,362	$ 27,957
Revenue Benchmark \| Asia-Pacific, including Australia and New Zealand \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	7.00%	8.00%	7.00%	8.00%
Revenue Benchmark \| Rest of world
Disaggregation of Revenue [Line Items]
Revenue	$ 26,805	$ 9,339	$ 48,359	$ 17,147
Revenue Benchmark \| Rest of world \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	6.00%	4.00%	6.00%	4.00%
Revenue Benchmark \| U.S \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue		65.00%	64.00%	65.00%

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Deferred revenue, revenue recognized	$ 360,900	$ 144,400	$ 577,000	$ 241,200
Deferred revenue—current portion	$ 1,488,200		$ 1,488,200		$ 1,070,230
Revenue Benchmark \| Consumable virtual items \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	12.00%	14.00%	12.00%	13.00%
Revenue Benchmark \| Durable virtual items \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue	88.00%	86.00%	88.00%	87.00%

Leases - Summary of Company's C

Leases - Summary of Company's Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Assets [Abstract]
Operating lease right-of-use assets	$ 228,232
Prepaid expenses and other current assets	45,432		$ 26,274
Total assets			26,274
Liabilities [Abstract]
Accrued expenses and other current liabilities	182,084		65,392
Other long-term liabilities			22,109
Operating lease liabilities—short-term	45,340		0
Operating lease liabilities—long-term	$ 206,376
Total liabilities			87,501
Cumulative Effect, Period of Adoption, Adjustment
Assets [Abstract]
Operating lease right-of-use assets			195,944
Prepaid expenses and other current assets			(8,106)
Total assets			187,838
Liabilities [Abstract]
Accrued expenses and other current liabilities			(1,704)
Other long-term liabilities			(21,983)
Operating lease liabilities—short-term			32,162
Operating lease liabilities—long-term			179,363
Total liabilities			$ 187,838
Cumulative Effect, Period of Adoption, Adjusted Balance
Assets [Abstract]
Operating lease right-of-use assets		$ 195,944
Prepaid expenses and other current assets		18,168
Total assets		214,112
Liabilities [Abstract]
Accrued expenses and other current liabilities		63,688
Other long-term liabilities		126
Operating lease liabilities—short-term		32,162
Operating lease liabilities—long-term		179,363
Total liabilities		$ 275,339

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
Leases - Additional Information (Detail) $ in Thousands	Jun. 30, 2021USD ($)ft²	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)ft²	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Operating lease expense	$ 12,800		$ 24,800
Operating lease liabilities current	$ 45,340		$ 45,340		$ 0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other current liabilities		Accrued expenses and other current liabilities
Operating lease liabilities	$ 206,376		$ 206,376
Operating leases, legally binding future minimum payments due					$ 287,716
Rent expense		$ 10,000		$ 20,000
Operating Lease, Lease Not Yet Commenced
Operating lease, lease not yet commenced, liability to be paid	$ 94,100		$ 94,100
Headquarter Office Lease
Operating lease term	9 years		9 years
Operating leases, legally binding future minimum payments due	$ 90,000		$ 90,000
Additional leased space \| ft²	123,000		123,000
Minimum \| Operating Lease, Lease Not Yet Commenced
Operating lease term	3 years		3 years
Maximum \| Operating Lease, Lease Not Yet Commenced
Operating lease term	10 years		10 years

Leases - Summary of Non-cancela

Leases - Summary of Non-cancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Leases [Abstract]
Remainder of 2021	$ 26,944
2022	55,855
2023	50,220
2024	41,414
2025	34,860
Thereafter	78,423
Total lease payments	287,716
Less: interest	36,000
Present value of lease liabilities	$ 251,716

Leases - Summary of Supplementa

Leases - Summary of Supplemental Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Leases [Abstract]
Weighted average remaining lease term	6 years 2 months 19 days
Weighted average discount rate	4.00%
Cash paid for amounts included in the measurement of lease liabilities	$ 25,141
Lease liabilities arising from obtaining new ROU assets	53,554
Leasehold incentives received	$ 8,100

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Lease Payments (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Leases [Abstract]
2021	$ 51,397
2022	54,477
2023	47,915
2024	38,970
2025	32,223
Thereafter	55,882
Total lease payments	$ 280,864

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - shares	Jun. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Outstanding preferred stock warrants	0	0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets, Related to Our Financial Instruments, Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Money Market Funds \| Level 1
FairValueAssetsMeasuredOnRecurringBasis [Line Items]
Money Market funds classified as cash equivalents	$ 1,513,136	$ 310,392

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 11, 2020	Nov. 30, 2020	Dec. 31, 2020
Loomai
Business Acquisition [Line Items]
Business combination total consideration transferred value	$ 86,694
Business combination transaction costs expensed	800
Business combination unrecognized share based combination acquiree	$ 9,200
Business combination unrecognized share based combination acquiree Period of recognition	3 years
Business combination goodwill deductible for tax purposes	$ 6,700
Payment of cash to acquire business	$ 45,998
Loomai \| Technology-Based Intangible Assets
Business Acquisition [Line Items]
Finite lived intangible assets acquired			$ 29,000
Finite lived intangible assets acquired weighted remaining useful lives			5 years
Loomai \| Common Class A
Business Acquisition [Line Items]
Business combination equity issued (in shares)	1,300,000
Business combination fair value of equity issued or issuable	$ 40,700
Imbellus
Business Acquisition [Line Items]
Business combination equity issued (in shares)		80,000
Business combination fair value of equity issued or issuable		$ 2,900
Payment of cash to acquire business		$ 8,800
Imbellus \| Technology-Based Intangible Assets
Business Acquisition [Line Items]
Finite lived intangible assets acquired			$ 11,700
Finite lived intangible assets acquired weighted remaining useful lives			5 years

Acquisitions - Summary of Aggre

Acquisitions - Summary of Aggregate Purchase Consideration (Detail) - Loomai $ in Thousands	Dec. 11, 2020USD ($)
Business Acquisition [Line Items]
Cash paid	$ 45,998
Common stock issued	35,203
Replacement awards attributable to pre-acquisition service	5,493
Total purchase price	$ 86,694

Acquisitions - Summary of Fair

Acquisitions - Summary of Fair Value Of Assets Acquired And Liabilities Assumed (Detail) - Loomai $ in Thousands	Dec. 11, 2020USD ($)
Business Acquisition [Line Items]
Cash and cash equivalents	$ 5,080
Prepaid expenses and other current assets	45
Goodwill	59,568
Identified intangible asset—developed technology	29,000
Deferred tax liabilities	(6,681)
Accrued expenses and other current liabilities	(318)
Total purchase price	$ 86,694

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 59,568
Addition from acquisition	0
Ending balance	$ 59,568

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	$ 42,959	$ 42,959
Accumulated Amortization	(5,454)	(1,206)
Total remaining amortization	37,505	41,753
Developed Technology
Goodwill and Intangible Assets [Line Items]
Gross Carrying Amount	42,959	42,959
Accumulated Amortization	(5,454)	(1,206)
Total remaining amortization	$ 37,505	$ 41,753
Weighted Average Remaining Useful Life (in Years)	4 years 4 months 24 days	4 years 10 months 24 days

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite-lived intangible assets	$ 0.6	$ 0.6	$ 0.6
Amortization expense	$ 2.1	$ 4.2

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule Of Expected Future Amortization Expenses Related To The Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 4,248
2022	8,495
2023	8,495
2024	8,401
2025	7,866
Thereafter	0
Total remaining amortization	$ 37,505	$ 41,753

Other Balance Sheet Component_2

Other Balance Sheet Components - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Other Balance Sheet Components [Abstract]
Restricted Cash	$ 0		$ 0		$ 0
Depreciation expense	$ 15,700,000	$ 9,700,000	$ 30,200,000	$ 18,700,000

Other Balance Sheet Component_3

Other Balance Sheet Components - Summary of Prepaid Expenses And Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Balance Sheet Components [Abstract]
Prepaid Expenses	$ 40,207	$ 17,606
Other current assets	5,225	8,668
Total prepaid expenses and other current assets	$ 45,432	$ 26,274

Other Balance Sheet Component_4

Other Balance Sheet Components - Summary of Property And Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 337,408	$ 296,385
Less accumulated depreciation and amortization	(118,827)	(89,970)
Property and equipment—net	218,581	206,415
Servers and related equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	300,784	264,994
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,985	3,498
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	162	162
Leasehold improvement
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,754	27,437
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,723	$ 294

Other Balance Sheet Component_5

Other Balance Sheet Components - Summary of Accrued Expenses And Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Balance Sheet Components [Abstract]
General accrued expenses	$ 94,731	$ 41,699
Operating lease liabilities—short-term	45,340	0
Other current liabilities	42,013	23,693
Total accrued expenses and other current liabilities	$ 182,084	$ 65,392

Debt - Additional Information (

Debt - Additional Information (Detail) - Revolving Credit Facility - USD ($)	1 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Dec. 31, 2020	Feb. 28, 2019
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity				$ 50,000,000
Interest rate				1.50%
Debt Instrument renewal term		1 year
Line of credit facility, current borrowing capacity			$ 0
Line of credit facility, covenant terms, minimum liquidity			$ 50,000,000
Termination of line of credit facility	$ 50,000,000
Long-term line of credit	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding, amount	$ 9.9	$ 9.9
Litigation accrual	$ 41

Convertible Preferred Stock - A

Convertible Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Mar. 09, 2021	Jan. 31, 2021	Nov. 30, 2020
H
Convertible Preferred Stock [Line Items]
Temporary equity shares issued during the period shares (in shares)		11,888,886
Temporary equity issue price (in dollars per share)	$ 45	$ 45
Proceeds from issuance of redeemable convertible preferred stock		$ 534.3
Common Class A \| Before Direct Listing
Convertible Preferred Stock [Line Items]
Conversion of temporary equity into permanent equity shares (in shares)	349,123,976
Common Class A \| Affiliated Entity
Convertible Preferred Stock [Line Items]
Conversion of common stock of one class into common stock of another class (in shares)			57,300,000
Common Class B \| Affiliated Entity
Convertible Preferred Stock [Line Items]
Conversion of common stock of one class into common stock of another class (in shares)			57,300,000

Convertible Preferred Stock - S

Convertible Preferred Stock - Summary of Convertible Preferred Stock Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Mar. 09, 2021	Jan. 31, 2021
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	361,744
Shares outstanding (in shares)	349,124
Aggregate Liquidation Preference	$ 870,654
Carrying Value of Preferred	$ 879,113
A
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	28,000
Shares outstanding (in shares)	16,358
Per share price at issuance (in dollars per share)	$ 0.02
Per share conversion price (in dollars per share)	$ 0.02
Aggregate Liquidation Preference	$ 327
Carrying Value of Preferred	$ 313
B
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	45,532
Shares outstanding (in shares)	45,532
Per share price at issuance (in dollars per share)	$ 0.03
Per share conversion price (in dollars per share)	$ 0.03
Aggregate Liquidation Preference	$ 1,070
Carrying Value of Preferred	$ 1,054
C
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	95,290
Shares outstanding (in shares)	95,290
Per share price at issuance (in dollars per share)	$ 0.03
Per share conversion price (in dollars per share)	$ 0.03
Aggregate Liquidation Preference	$ 2,935
Carrying Value of Preferred	$ 4,150
D
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	54,860
Shares outstanding (in shares)	54,215
Per share price at issuance (in dollars per share)	$ 0.04
Per share conversion price (in dollars per share)	$ 0.04
Aggregate Liquidation Preference	$ 2,150
Carrying Value of Preferred	$ 2,097
D-1
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	44,706
Shares outstanding (in shares)	44,706
Per share price at issuance (in dollars per share)	$ 0.09
Per share conversion price (in dollars per share)	$ 0.09
Aggregate Liquidation Preference	$ 4,172
Carrying Value of Preferred	$ 12,998
E
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	24,340
Shares outstanding (in shares)	24,340
Per share price at issuance (in dollars per share)	$ 1.03
Per share conversion price (in dollars per share)	$ 1.03
Aggregate Liquidation Preference	$ 25,000
Carrying Value of Preferred	$ 24,906
F
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	33,149
Shares outstanding (in shares)	33,149
Per share price at issuance (in dollars per share)	$ 4.53
Per share conversion price (in dollars per share)	$ 4.53
Aggregate Liquidation Preference	$ 150,000
Carrying Value of Preferred	$ 149,640
G
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	23,645
Shares outstanding (in shares)	23,645
Per share price at issuance (in dollars per share)	$ 6.34
Per share conversion price (in dollars per share)	$ 6.34
Aggregate Liquidation Preference	$ 150,000
Carrying Value of Preferred	$ 149,669
H
Convertible Preferred Stock [Line Items]
Shares authorized (in shares)	12,222
Shares outstanding (in shares)	11,889
Per share price at issuance (in dollars per share)	$ 45	$ 45
Per share conversion price (in dollars per share)	$ 45
Aggregate Liquidation Preference	$ 535,000
Carrying Value of Preferred	$ 534,286

Stockholders' Equity (Deficit_2

Stockholders' Equity (Deficit) - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2021$ / sharesshares	Jun. 30, 2021vote$ / sharesshares	Mar. 09, 2021shares	Dec. 31, 2020shares
Class of Stock [Line Items]
Shares authorized (in shares)			361,744,000
Common stock, shares authorized (in shares)	5,000,000,000	5,000,000,000		740,000,000
Common stock, conversion ratio	1	1
Term of conversion, threshold percentage of common stock outstanding	66.67%	66.67%
Common Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	4,935,000,000	4,935,000,000		675,000,000
Common Class A \| Certificate Of Incorporation Restated
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	4,935,000,000	4,935,000,000
Common stock, voting rights per share \| vote		1
Common Class A \| David Baszucki Founder
Class of Stock [Line Items]
Number of Class B common stock converted into Class A common stock (in shares)	0	3,700,000
Common Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	65,000,000	65,000,000		65,000,000
Maximum percentage of stock outstanding of a particular class before which shares of another class are converted into this class	30.00%	30.00%
Common Class B \| Certificate Of Incorporation Restated
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	65,000,000	65,000,000
Common stock, voting rights per share \| vote		20
Preferred Stock
Class of Stock [Line Items]
Shares authorized (in shares)	100,000,000	100,000,000
Convertible preferred stock, par value (in dollars per share) \| $ / shares	$ 0.0001	$ 0.0001

Stockholders' Equity (Deficit_3

Stockholders' Equity (Deficit) - Disclosure Of Future Issuance (Detail) - shares shares in Thousands	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	159,548	454,958
Convertible Preferred Stock
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	0	337,235
Stock options outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	73,244	98,502
Restricted Stock Units
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	10,092	3,061
PSUs outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	11,500	0
Shares available for issuance under Equity Incentive Plan
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	58,032	15,448
2020 ESPP
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	6,000	0
Stock Warrants outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	324	324
Unregistered restricted stock awards outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	356	388

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 28, 2021	Feb. 28, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2017	Dec. 31, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)			159,548,000			159,548,000	159,548,000		454,958,000
Share based payment arrangement, unvested award options, cost not yet recognized, amount			$ 200,000			$ 200,000	$ 200,000
Share based compensation by share based payment arrangement options granted (in shares)			0				0
Allocated share based compensation			$ 81,659		$ 7,409		$ 132,403	$ 49,666
Tender Offer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation									$ 35,200
Tender Offer \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares offered by existing shareholders to buy shares from employees and former employees (in shares)				31,100,000
Tender Offer \| Series G Redeemable Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares offered by existing shareholders to buy shares from employees and former employees (in shares)				24,000,000
Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value									110.00%
Percentage of voting stock eligible for options									10.00%
Two Thousand and Twenty Equity Incentive Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)			60,000,000			60,000,000	60,000,000
Two Thousand and Twenty Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation			$ 2,900				$ 3,400
Two Thousand and Twenty Employee Stock Purchase Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value									85.00%
Common stock shares reserved for future issuance (in shares)									6,000,000
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)			73,244,000			73,244,000	73,244,000		98,502,000
Share based payment arrangement, unvested award, period for recognition							3 years 1 month 6 days
Options \| Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement number of shares available for issuance (in shares)			0			0	0
Options \| Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of voting stock eligible for options										10.00%
Share based compensation by share based payment arrangement number of shares available for issuance (in shares)			0			0	0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)			10,092,000			10,092,000	10,092,000		3,061,000
Share based payment arrangement, unvested award, period for recognition							3 years 7 months 6 days
Unrecognized compensation, equity instruments other than options			$ 562,700			$ 562,700	$ 562,700
Allocated share based compensation				$ 21,300
Service period						4 years
Grant date fair value (in dollars per share)			$ 63.69			$ 63.69	$ 63.69		$ 31.55
Restricted Stock Units \| Founder and CEO Long Term Performance Award \| Founder CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation, equity instruments other than options	$ 232,200	$ 232,200	$ 214,800			$ 214,800	$ 214,800
Allocated share based compensation			12,200				$ 17,400
Share based compensation by share based payment arrangement maximum number of shares per employee (in shares)		11,500,000
Share-based compensation arrangement by share-based payment award, beginning Of award performance period, period after effective date		2 years
Number of consecutive trading days for the stock hurdle price to be achieved		90 days
Share price (in dollars per share)	$ 165	$ 165
Grant date fair value (in dollars per share)	$ 20.19	$ 20.19
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangement, unvested award, period for recognition							2 years 4 months 24 days
Unrecognized compensation, equity instruments other than options			$ 7,500			$ 7,500	$ 7,500
Grant date fair value (in dollars per share)			$ 37.75			$ 37.75	$ 37.75		$ 37.75
Minimum \| Options \| Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value											85.00%
Minimum \| Restricted Stock Units \| Founder and CEO Long Term Performance Award \| Founder CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangement, unvested award, period for recognition	3 years 5 months 12 days
Maximum \| Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term of stock options									10 years
Maximum \| Options \| Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term of stock options											10 years
Maximum \| Options \| Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term of stock options										10 years
Maximum \| Restricted Stock Units \| Founder and CEO Long Term Performance Award \| Founder CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment arrangement, unvested award, period for recognition	5 years 4 months 17 days
Holders of Ten Percent or More of The Voting Equity Capital \| Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term of stock options									5 years
Holders of Ten Percent or More of The Voting Equity Capital \| Options \| Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of voting stock eligible for options											10.00%
Share based compensation by share based payment arrangement contractual term of stock options											5 years
Holders of Ten Percent or More of The Voting Equity Capital \| Options \| Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based payment arrangement contractual term of stock options										5 years
Holders of Ten Percent or More of The Voting Equity Capital \| Minimum \| Two Thousand and Twenty Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value									100.00%
Holders of Ten Percent or More of The Voting Equity Capital \| Minimum \| Options \| Two Thousand and Four Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value											110.00%
Holders of Ten Percent or More of The Voting Equity Capital \| Minimum \| Options \| Two Thousand and Seventeen Amended and Restated Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to be granted price as a percentage of fair value										110.00%

Stock-based Compensation - Summ

Stock-based Compensation - Summary of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	$ 81,659	$ 7,409	$ 132,403	$ 49,666
Infrastructure and trust & safety
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	7,797	915	13,485	3,719
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	51,626	3,957	83,220	20,680
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	18,929	1,872	30,176	20,304
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	$ 3,307	$ 665	$ 5,522	$ 4,963

Stock-based Compensation - Su_2

Stock-based Compensation - Summary of Summarizes the Company's Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)		98,502,000
Granted (in shares)	0	0
Cancelled (in shares)		(1,119,000)
Exercised (in shares)		(24,139,000)
Ending balance (in shares)	73,244,000	73,244,000	98,502,000
Exercisable (in shares)	34,089,000	34,089,000
Vested and expected to vest (in shares)	73,244,000	73,244,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance, weighted average exercise price (in dollars per share)		$ 2.55
Granted, weighted average exercise price (in dollars per share)		0
Cancelled, weighted average exercise price (in dollars per share)		3.88
Exercised, weighted average exercise price (in dollars per share)		1.73
Ending balance, weighted average exercise price (in dollars per share)	$ 2.79	2.79	$ 2.55
Exercisable, weighted average exercise price (in dollars per share)	1.58	1.58
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 2.79	$ 2.79
Remaining contractual tern		7 years 5 months 15 days	7 years 9 months 3 days
Exercisable, remaining contractual term		6 years 5 months 15 days
Vested and expected to vest, remaining contractual term		7 years 5 months 15 days
Aggregate intrinsic value	$ 6,385,925	$ 6,385,925	$ 3,838,994
Exercisable, aggregate intrinsic value	3,013,482	3,013,482
Vested and expected to vest, aggregate intrinsic value	$ 6,385,925	$ 6,385,925

Stock-based Compensation - Su_3

Stock-based Compensation - Summary of Company's Restricted Stock Units And Unregistered Restricted Stock Awards Activity (Detail) shares in Thousands	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares) \| shares	3,061
Granted (in shares) \| shares	7,126
Released (in shares) \| shares	(3)
Cancelled (in shares) \| shares	(92)
Ending balance (in shares) \| shares	10,092
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 31.55
Granted, weighted average grant date fair value (in dollars per share) \| $ / shares	77.21
Released, weighted average grant date fair value (in dollars per share) \| $ / shares	77
Cancelled , weighted average exercise price (in dollars per share) \| $ / shares	32.01
Ending balance, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 63.69
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares) \| shares	388
Granted (in shares) \| shares	0
Released (in shares) \| shares	(32)
Cancelled (in shares) \| shares	0
Ending balance (in shares) \| shares	356
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 37.75
Granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Released, weighted average grant date fair value (in dollars per share) \| $ / shares	37.75
Cancelled , weighted average exercise price (in dollars per share) \| $ / shares	0
Ending balance, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 37.75

Stock-based Compensation - Su_4

Stock-based Compensation - Summary of Measured Based on an Average of Our Stock Price (Detail)	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 165
Number of RSUs Eligible to Vest (in shares) \| shares	750,000
Performance Period Commencement Dates as Measured from the Effective Date	2 years
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 200
Number of RSUs Eligible to Vest (in shares) \| shares	750,000
Performance Period Commencement Dates as Measured from the Effective Date	3 years
Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 235
Number of RSUs Eligible to Vest (in shares) \| shares	2,000,000
Performance Period Commencement Dates as Measured from the Effective Date	4 years
Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 270
Number of RSUs Eligible to Vest (in shares) \| shares	2,000,000
Performance Period Commencement Dates as Measured from the Effective Date	5 years
Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 305
Number of RSUs Eligible to Vest (in shares) \| shares	2,000,000
Performance Period Commencement Dates as Measured from the Effective Date	5 years
Tranche Six
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 340
Number of RSUs Eligible to Vest (in shares) \| shares	2,000,000
Performance Period Commencement Dates as Measured from the Effective Date	5 years
Tranche Seven
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company Stock Price Hurdle \| $ / shares	$ 375
Number of RSUs Eligible to Vest (in shares) \| shares	2,000,000
Performance Period Commencement Dates as Measured from the Effective Date	5 years

Stock-based Compensation - Su_5

Stock-based Compensation - Summary of Employee Stock Purchase Plan (Detail)	6 Months Ended
	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate, minimum	0.06%
Risk free interest rate, maximum	0.15%
Expected volatility rate, minimum	53.77%
Expected volatility rate, maximum	56.90%
Dividend yield	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected terms (in years)	1 year 11 months 12 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected terms (in years)	5 months 8 days

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer discretionary contribution amount	$ 2.3	$ 1.1	$ 4.2	$ 2.1
First Three Percent Contribution
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of match			100.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay			3.00%
Next Two Percent Contribution
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of match			50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay			2.00%

Joint Venture - Additional Info

Joint Venture - Additional Information (Detail) - Roblox China Holding Corp $ in Millions	Feb. 28, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage	51.00%
Songhua River Investment Limited
Schedule of Equity Method Investments [Line Items]
Contribution by non controlling interest to the joint venture	$ 50
Minority interest percentage in joint venture	49.00%

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Common Share - Summary of Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Consolidated Net loss	$ (142,930)	$ (72,263)	$ (279,033)	$ (147,140)
Less: net loss attributable to noncontrolling interests	(2,796)	(742)	(4,682)	(1,240)
Net loss attributable to common stockholders	(140,134)	(71,521)	(274,351)	(145,900)
Net loss attributable to common stockholders	$ (140,134)	$ (71,521)	$ (274,351)	$ (145,900)
Denominator
Weighted-average common shares used in per share computation, basic (in shares)	571,300,000	180,336,000	432,159,000	174,939,000
Weighted-average common shares used in per share computation, diluted (in shares)	571,300,000	180,336,000	432,159,000	174,939,000
Net loss per share, basic (in dollars per share)	$ (0.25)	$ (0.40)	$ (0.63)	$ (0.83)
Net loss per share, diluted (in dollars per share)	$ (0.25)	$ (0.40)	$ (0.63)	$ (0.83)

Basic and Diluted Net Loss Pe_4

Basic and Diluted Net Loss Per Common Share - Summary of Computation of Diluted Net Loss Per Share (Detail) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	84,747	441,648
Stock options outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	73,244	91,866
RSUs outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	10,092	0
Stock warrants outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	324	260
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	0	349,522
Unregistered restricted stock awards outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	356	0
2020 ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in share)	731	0

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Aug. 16, 2021USD ($)
Subsequent Event \| Guilded Inc.
Subsequent Event [Line Items]
Business combination total consideration transferred value	$ 90