Datadog (DDOG) 10-K25 Feb 202019 FY Annual reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Dec. 31, 2019	Feb. 14, 2020
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	DDOG
Entity Registrant Name	Datadog, Inc.
Entity Central Index Key	0001561550
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Public Float	$ 2.4
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity File Number	001-39051
Entity Tax Identification Number	27-2825503
Entity Address, Address Line One	620 8th Avenue
Entity Address, Address Line Two	45th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10018
City Area Code	866
Local Phone Number	329-4466
Title of 12(b) Security	Class A common stock, par value $0.00001 per share
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Documents Incorporated by Reference	Portions of the registrant’s Proxy Statement for its 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2019.
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		65,045,636
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		232,027,598

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 597,297	$ 53,639
Marketable securities	176,674
Accounts receivable, net of allowance for doubtful accounts of $817 and $477 as of December 31, 2019 and 2018, respectively	102,394	55,822
Deferred contract costs, current	8,346	3,717
Prepaid expenses and other current assets	19,231	8,773
Total current assets	903,942	121,951
Property and equipment, net	32,749	21,649
Operating lease assets	53,002
Goodwill	9,058	7,626
Intangible assets, net	1,435	1,288
Deferred contract costs, non-current	17,409	7,292
Restricted cash	3,456	11,341
Other assets	16,990	8,603
TOTAL ASSETS	1,038,041	179,750
CURRENT LIABILITIES:
Accounts payable	15,429	12,638
Accrued expenses and other current liabilities	38,746	30,290
Operating lease liabilities, current	11,916
Deferred revenue, current	134,148	69,306
Total current liabilities	200,239	112,234
Operating lease liabilities, non-current	48,510
Deferred revenue, non-current	4,340	1,393
Other liabilities	2,611	1,359
Total liabilities	255,700	114,986
COMMITMENTS AND CONTINGENCIES (NOTE 9)
CONVERTIBLE PREFERRED STOCK:
Convertible preferred stock; $0.00001 par value per share; 0 and 179,814,912 shares authorized as of December 31, 2019 and 2018, respectively; 0 and 179,814,912 shares issued and outstanding as of December 31, 2019 and 2018, respectively		140,805
STOCKHOLDERS' EQUITY (DEFICIT):
Preferred stock; $0.00001 par value per share; 20,000,000 and 0 shares authorized as of December 31, 2019 and 2018, respectively; 0 shares issued and outstanding as of December 31, 2019 and 2018, respectively
Additional paid-in capital	905,821	30,834
Accumulated other comprehensive income	133	31
Accumulated deficit	(123,616)	(106,906)
Total stockholders’ equity (deficit)	782,341	(76,041)
TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)	1,038,041	$ 179,750
Class A Common Stock
STOCKHOLDERS' EQUITY (DEFICIT):
Common stock, value	1
Class B Common Stock
STOCKHOLDERS' EQUITY (DEFICIT):
Common stock, value	$ 2

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable, net of allowance for doubtful accounts	$ 817	$ 477
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	20,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	0	380,000,000
Common stock, shares issued	0	78,180,606
Common stock, shares outstanding	0	78,180,606
Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.00001	$ 0.00001
Convertible preferred stock, shares authorized	0	179,814,912
Convertible preferred stock, shares issued	0	179,814,912
Convertible preferred stock, shares outstanding	0	179,814,912
Class A Common Stock
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	2,000,000,000	0
Common stock, shares issued	64,308,498	0
Common stock, shares outstanding	64,308,498	0
Class B Common Stock
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	310,000,000	0
Common stock, shares issued	232,078,452	0
Common stock, shares outstanding	232,078,452	0

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 362,780	$ 198,077	$ 100,761
Cost of revenue	88,949	46,529	23,414
Gross profit	273,831	151,548	77,347
Operating expenses:
Research and development	111,425	55,176	24,734
Sales and marketing	146,657	88,849	44,213
General and administrative	35,889	18,556	11,356
Total operating expenses	293,971	162,581	80,303
Operating loss	(20,140)	(11,033)	(2,956)
Other income, net	4,164	793	843
Loss before provision for income taxes	(15,976)	(10,240)	(2,113)
Provision for income taxes	(734)	(522)	(457)
Net loss	(16,710)	(10,762)	(2,570)
Net loss attributable to common stockholders	$ (16,710)	$ (10,762)	$ (2,570)
Basic and diluted net loss per share	$ (0.12)	$ (0.15)	$ (0.04)
Weighted average shares used in calculating basic and diluted net loss per share:	140	71	61

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (16,710)	$ (10,762)	$ (2,570)
Other comprehensive income (loss):
Foreign currency translation adjustments	55	78	(48)
Unrealized gain on available-for-sale marketable securities	47
Other comprehensive income (loss)	102	78	(48)
Comprehensive loss	$ (16,608)	$ (10,684)	$ (2,618)

CONSOLIDATED STATEMENTS OF CONV

CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Third-Party Tender Offer	Initial Public Offering	Convertible Preferred Stock	Convertible Preferred StockThird-Party Tender Offer	Convertible Preferred StockInitial Public Offering	Class A and Class B Common Stock	Class A and Class B Common StockInitial Public Offering	Non-Voting Common Stock	Common Stock	Common StockThird-Party Tender Offer	Additional Paid-in Capital	Additional Paid-in CapitalThird-Party Tender Offer	Additional Paid-in CapitalInitial Public Offering	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Convertible preferred stock, beginning balance, shares at Dec. 31, 2016				179,814,912
Convertible preferred stock, beginning balance at Dec. 31, 2016				$ 140,805
Beginning balance, shares at Dec. 31, 2016									1,137,000	57,692,496
Beginning balance at Dec. 31, 2016	$ (81,691)											$ 13,785				$ (95,476)
Effect of adoption of ASU (Adoption of ASU 606) at Dec. 31, 2016	2,677															2,677
Beginning balance, adjusted at Dec. 31, 2016	$ (79,014)											13,785				(92,799)
Convertible preferred stock, beginning balance adjusted, shares at Dec. 31, 2016				179,814,912
Convertible preferred stock adjusted, beginning balance at Dec. 31, 2016				$ 140,805
Beginning balance adjusted, shares at Dec. 31, 2016									1,137,000	57,692,496
Issuance of common stock upon exercise of stock options, shares	2,165,976									2,165,976
Issuance of common stock upon exercise of stock options	$ 449											449
Vesting of early exercised stock options	143											143
Issuance of common stock for acquisition, shares										2,292,012
Issuance of common stock for acquisition	2,015											2,015
Stock-based compensation	3,316											3,316
Other comprehensive income (loss)	(48)														$ (48)
Other	8											8
Other, shares										10,500
Net loss	(2,570)															(2,570)
Ending balance at Dec. 31, 2017	(75,701)											19,716			(48)	(95,369)
Convertible preferred stock, ending balance, shares at Dec. 31, 2017				179,814,912
Convertible preferred stock, ending balance at Dec. 31, 2017				$ 140,805
Ending balance, shares at Dec. 31, 2017									1,137,000	62,160,984
Effect of adoption of ASU (Adoption of ASU 2016-19) at Dec. 31, 2017												775				(775)
Ending balance, adjusted at Dec. 31, 2017	$ (75,701)											20,491			(48)	(96,144)
Convertible preferred stock, ending balance adjusted, shares at Dec. 31, 2017				179,814,912
Convertible preferred stock adjusted, ending balance at Dec. 31, 2017				$ 140,805
Ending balance adjusted, shares at Dec. 31, 2017									1,137,000	62,160,984
Issuance of common stock upon exercise of stock options, shares	14,882,622									14,882,622
Issuance of common stock upon exercise of stock options	$ 4,557											4,557
Vesting of early exercised stock options	375											375
Stock-based compensation	5,411											5,411
Conversion of non-voting common stock									(1,137,000)	1,137,000
Other comprehensive income (loss)	78
Other comprehensive income (loss)	79														79
Net loss	(10,762)															(10,762)
Ending balance at Dec. 31, 2018	(76,041)											30,834			31	(106,906)
Convertible preferred stock, ending balance, shares at Dec. 31, 2018				179,814,912
Convertible preferred stock, ending balance at Dec. 31, 2018	$ 140,805
Ending balance, shares at Dec. 31, 2018										78,180,606
Convertible preferred stock adjusted, ending balance at Dec. 31, 2018				$ 140,805
Issuance of common stock upon exercise of stock options, shares	10,546,987						429,430			10,117,557
Issuance of common stock upon exercise of stock options	$ 7,173											7,173
Issuance of restricted shares of common stock, shares							244,445
Vesting of early exercised stock options	1,883											1,883
Stock-based compensation	19,235											19,235
Conversion of convertible preferred stock to common stock, shares					(803,481)	(179,011,431)		179,011,431			803,481
Conversion of convertible preferred stock to common stock		$ 53	$ 140,752		$ (53)	$ (140,752)		$ 2					$ 53	$ 140,750
Reclassification of common stock to class Aand class B common stock							89,101,644			(89,101,644)
Issuance of class A common stock in connection with initial public offering, net of underwriting discounts and issuance costs, shares							27,600,000
Issuance of class A common stock in connection with initial public offering, net of underwriting discounts and issuance costs	705,894						$ 1					705,893
Other comprehensive income (loss)	102														102
Net loss	(16,710)															(16,710)
Ending balance at Dec. 31, 2019	$ 782,341						$ 3					$ 905,821			$ 133	$ (123,616)
Convertible preferred stock, ending balance, shares at Dec. 31, 2019				0
Ending balance, shares at Dec. 31, 2019							296,386,950

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (16,710)	$ (10,762)	$ (2,570)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	12,370	6,026	2,704
Amortization of discounts or premiums on marketable securities	12
Amortization of deferred contract costs	5,400	2,671	1,274
Stock-based compensation, net of amounts capitalized	19,034	5,244	3,068
Non-cash lease expense	11,763
Provision for accounts receivable allowance	1,195	477	378
Loss on disposal of property and equipment	708	9	4
Changes in operating assets and liabilities:
Accounts receivable, net	(47,510)	(25,322)	(19,274)
Deferred contract costs	(20,146)	(8,925)	(3,352)
Prepaid expenses and other current assets	(10,046)	(1,331)	(4,250)
Other assets	(8,486)	(6,955)	(1,482)
Accounts payable	2,484	7,241	4,647
Accrued expenses and other liabilities	6,376	10,857	2,860
Deferred revenue	67,790	31,599	29,825
Net cash provided by operating activities	24,234	10,829	13,832
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(176,639)
Purchases of property and equipment	(13,315)	(9,662)	(2,351)
Capitalized software development costs	(10,128)	(6,176)	(5,452)
Cash paid for acquisition of businesses; net of cash acquired	(2,138)	(1,618)	(4,957)
Net cash used in investing activities	(202,220)	(17,456)	(12,760)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	7,899	7,782	462
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs	706,317
Net cash provided by financing activities	714,216	7,782	462
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(21)	47	(54)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	536,209	1,202	1,480
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	64,980	63,778	62,298
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	601,189	64,980	63,778
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	143	36	40
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued property and equipment purchases	315	25
Stock-based compensation included in capitalized software development costs	201	167	248
Vesting of early exercised options	1,883	375	143
Acquisition of intangible assets through issuance of common stock			2,015
Costs related to initial public offering included in accounts payable and accrued liabilities	423
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH WITHIN THE CONSOLIDATED BALANCE SHEETS TO THE AMOUNTS SHOWN IN THE STATEMENTS OF CASH FLOWS ABOVE:
Cash and cash equivalents	597,297	53,639	60,024
Restricted cash – Including amounts in prepaid expense and other current assets and other assets	$ 3,892	$ 11,341	$ 3,754
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List]	ddog:PrepaidExpenseOtherCurrentAssetsAndOtherAssets	ddog:PrepaidExpenseOtherCurrentAssetsAndOtherAssets	ddog:PrepaidExpenseOtherCurrentAssetsAndOtherAssets
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	$ 601,189	$ 64,980	$ 63,778

Organization and Description of

Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	1. Organization Description Datadog,

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	2. Basis Basis of Presentation The Principles The r Initial Public Offering On September 23, 2019, the Company completed its initial public offering (“IPO”), in which the Company issued and sold 24,000,000 shares of its Class A common stock at a public offering price of $27.00 per share, which resulted in net proceeds of $615.6 million after deducting underwriting discounts and commissions. On September 25, 2019, the underwriters exercised their option to purchase an additional 3,600,000 shares of Class A common stock at $27.00 per share, resulting in additional proceeds of $92.3 million, net of underwriters’ discounts and commissions. Immediately prior to the closing of the IPO, all shares of common stock then outstanding were reclassified as Class B common stock and all shares of the convertible preferred stock then outstanding automatically converted into 179,011,431 shares of Class B common stock. The Company incurred $2.0 million of net offering costs in connection with the IPO which were recorded as an offset against IPO proceeds. Stock Split and Authorized Shares On January 2, 2018, the Company’s Board of Directors (the “Board”) and stockholders approved a 4-for-1 stock split of the Company’s then-outstanding common stock and convertible preferred stock was effected without any change in the par value per share. On September 6, 2019, the Board and stockholders approved an amended and restated certificate of incorporation of the Company effecting a 3-for-1 stock split of the Company’s issued and outstanding shares of common stock and convertible preferred stock, and an increase to the authorized shares of the Company’s common stock and convertible preferred stock to 380,000,000 shares and 179,814,912 shares, respectively. The split was effected on September 6, 2019 and without any change in the par value per share. All information related to the Company’s common stock, convertible preferred stock and stock awards has been retroactively adjusted to give effect to the 4-for-1 stock split on January 2, 2018 and 3-for-1 stock split on September 6, 2019. On September 23, 2019, an amended and restated certificate of incorporation of the Company was filed immediately prior to the closing of the IPO authorizing an aggregate of 2,330,000,000 shares of capital stock of the Company, including 2,000,000,000 shares of Class A common stock, 310,000,000 shares of Class B common stock and 20,000,000 shares of preferred stock. Segment The Use of Estimates The Foreign Currency Translation The ( equity (deficit) Transaction e Revenue Recognition The Company generates The Company elected to early adopt Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“Topic 606”), effective January 1, 2017, using the full retrospective method of adoption. As such, the consolidated financial statements present revenue in accordance with Topic 606 for all of the periods presented. The Company accounts (1) identify r (2) identify t (3) determine e (4) allocate e (5) recognize n The Company’s s s The transaction price is based on the fixed price for the contracted level of service plus variable consideration for additional optional purchases. Billing periods correspond to the periods over which services are performed and there are no discounts given on the purchase of future services. The Revenue For r The Cost of Revenue Cost e Research and Development Research s Sales and Marketing Sales and marketing primarily Advertising Advertising and Income The The Stock-Based The Company recognizes and measures restricted stock units (“RSUs”), and the employee stock purchase plan (the “ESPP”) The Company also has certain options that have performance-based vesting conditions; stock-based compensation expense for such awards is recognized on a straight-line basis from the time the vesting condition is likely to be met through the time the vesting condition has been achieved. Cash and Cash Equivalents The Marketable Securities The Company’s marketable securities consist of commercial debt securities, U.S. government treasury securities, and commercial paper. The Company determines the appropriate classification of its marketable securities at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its marketable securities as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its marketable securities within current assets on the consolidated balance sheet. Available-for-sale securities are recorded at fair value each reporting period. Premiums and discounts are amortized or accreted over the life of the related available-for-sale security as an adjustment to yield using the effective interest method. Interest income is recognized when earned. Unrealized gains and losses on these marketable securities are reported as a separate component of accumulated other comprehensive (loss) income on the consolidated balance sheet until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income in the consolidated statements of operations. The Company periodically evaluates its marketable securities to assess whether those with unrealized loss positions are other than temporarily impaired. The Company considers various factors in determining whether to recognize an impairment charge. If the Company determines that the decline in an investment's fair value is other-than-temporary, the difference is recognized as an impairment loss in the consolidated statements of operations. As of December 31, 2019 and 2018, the Company has not recorded any other-than-temporary-impairment charges in its consolidated statements of operations. Restricted Restricted Concentration Financial There were no customers representing greater than 10% of total revenue for the years ended December 31, 2019, 2018, and 2017. No customers represented greater than 10% of accounts receivable as of December 31, 2019 and 2018. Geographical Revenue by location Year Ended December 31, 2019 2018 2017 North America $ 272,190 $ 150,945 $ 76,352 International 90,590 47,132 24,409 Total $ 362,780 $ 198,077 $ 100,761 Other Fair Value of Financial The accounting guidance for -tiered Level Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date. Level Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Level Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date. The Company’s financial instruments consist of cash equivalents, marketable securities, accounts receivable, accounts payable and accrued expenses. Cash equivalents are stated at amortized cost, which approximates fair value at the balance sheet dates, due to the short period of time to maturity. Marketable securities are recorded at fair value. Accounts receivable, accounts payable, and accrued expenses are stated at their carrying value, which approximates fair value due to the short time to the expected receipt or payment date. A Accounts Receivable Accounts Unbilled As of December 31, 2019 and 2018, unbilled accounts receivable of approximately $14.4 million and $13.1 million, respectively, was included in accounts receivable on the Company’s consolidated balance sheets. Internal The Capitalized Property Property Deferred Sales The The following Amount Balance as of January 1, 2017 $ 2,677 Additions to deferred contract costs 3,352 Amortization of deferred contract costs (1,274 ) Balance as of December 31, 2017 $ 4,755 Additions to deferred contract costs 8,925 Amortization of deferred contract costs (2,671 ) Balance as of December 31, 2018 $ 11,009 Additions to deferred contract costs 20,146 Amortization of deferred contract costs (5,400 ) Balance as of December 31, 2019 $ 25,755 Business Combinations When e Accounting for Long-lived Computers and equipment 3 years Furnitures and fixtures 5 years Leasehold improvements Shorter of lease term or useful life of asset Capitalized software development costs 2 years Intangible assets 1-3 years The Goodwill Operating The Company determines if an arrangement is a lease at inception. Operating lease assets and liabilities are reflected within operating lease assets, operating lease liabilities, current, and operating lease liabilities, non-current, on the consolidated balance sheets. For short-term leases (an initial term of 12 months or less), an operating lease asset and corresponding lease liability are not recorded and the Company records rent expense in its consolidated statements of operations on a straight-line basis over the lease term. Operating lease assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company generally uses its incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. The operating lease assets also include any lease payments made and excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components, which are accounted for separately. Prior to the adoption of ASC 842, Leases Deferred The Company records contract liabilities to deferred revenue when the Company receives customer payments in advance of the performance obligations being satisfied on the Company’s contracts. Certain of the Company’s customers pay in advance of satisfaction of performance obligations and other customers with monthly contract terms are billed in arrears on a monthly basis. Revenue recognized during the years ended December 31, 2019, 2018 and 2017, which was included in the deferred revenue balances at the beginning of each respective period, was $71.0 million, $37.1 million, and $9.2 million. Remaining . Net Income Basic Accounting Pronouncements In B Income Taxes (Topic 740), Balance Sheet Classification of Deferred Tax In Statement of Cash Flows In Statement of Cash Flows In Leases (ASC 842) In — Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accountin g Accounting Pronouncements In Intangibles—Goodwill and Other—Internal-Use Softwar e In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments— Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) Simplifying the Accounting for Income Taxes

Marketable Securities

Marketable Securities	12 Months Ended
Marketable Securities	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Marketable Securities	3. Marketable Securities The following is a summary of available-for-sale marketable securities, excluding those securities classified within cash and cash equivalents on the consolidated balance sheet as of December 31, 2019 (in thousands): Amortized Cost Unrealized Gain Unrealized Losses Fair Value Commercial debt securities $ 80,376 $ 46 $ (5 ) $ 80,417 U.S. government treasury securities 72,467 10 (4 ) 72,473 Commercial paper 23,784 — — 23,784 Marketable securities $ 176,627 $ 56 $ (9 ) $ 176,674 As of December 31, 2019, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands): Due within one year $ 97,816 Due in one year through five years 78,858 Total $ 176,674 The Company does not believe that any unrealized losses represent other-than-temporary impairments based on its evaluation of available evidence. To determine whether a decline in value is other-than-temporary, the Company evaluates, among other factors: the duration and extent to which the fair value has been less than the carrying value and its intent and ability to retain the marketable securities for a period of time sufficient to allow for any anticipated recovery in fair value.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. Fair Value Measurements The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of December 31, 2019 and 2018, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands): Fair Value Measurement as of December 31, 2019 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 588,762 $ — $ — $ 588,762 Marketable Securities: Corporate debt securities — 80,417 — 80,417 U.S. government treasury securities — 72,473 — 72,473 Commercial paper — 23,784 — 23,784 Total financial assets $ 588,762 $ 176,674 $ — $ 765,436 Fair Value Measurement as of December 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 47,187 $ — $ — $ 47,187 Total financial assets $ 47,187 $ — $ — $ 47,187 The Company classifies its highly liquid money market funds within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. The Company classifies its commercial paper, corporate debt securities, and U.S. government treasury securities within Level 2 because they are valued using inputs other than quoted prices that are directly or indirectly observable in the market, including readily available pricing sources for the identical underlying security which may not be actively traded.

Prepaid Expenses and Other Curr

Prepaid Expenses and Other Current Assets	12 Months Ended
Prepaid Expenses and Other Current Assets	Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]
Prepaid Expenses and Other Current Assets	5. Prepaid Expenses and Other Prepaid December 31, 2019 December 31, 2018 Hosting $ 9,180 $ 3,356 General prepaid expenses 5,700 3,607 Other receivables 2,578 526 Rent 821 1,066 Marketing 516 218 Restricted cash 436 — Total prepaid expenses and other current assets $ 19,231 $ 8,773

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
Property and Equipment, Net	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Property and Equipment, Net	6. Property and Equipment, Net Property and equipment, net consisted of the following (in thousands): December 31, 2019 December 31, 2018 Computers and equipment $ 7,536 $ 4,540 Furniture and fixtures 4,804 2,621 Leasehold improvements 16,517 8,554 Capitalized software development costs 24,630 15,000 Total property and equipment $ 53,487 $ 30,715 Less: accumulated depreciation and amortization (20,738 ) (9,066 ) Total property and equipment, net $ 32,749 $ 21,649 As discussed in Note 2, Basis of Presentation and Summary of Significant Accounting Policies—Internal Use Software Development Costs, the Company capitalizes costs related to the development of computer software for internal use and is included in capitalized software development costs within property and equipment, net. Depreciation and amortization expense was approximately $11.6 million, $5.5 million, and $2.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Acquisition, Intangible Assets

Acquisition, Intangible Assets and Goodwill	12 Months Ended
Acquisition, Intangible Assets and Goodwill	Dec. 31, 2019
Business Combinations [Abstract]
Acquisition, Intangible Assets and Goodwill	7. Acquisitio n 2019 Acquisition On November 6, 2019, the Company entered into a Stock Purchase Agreement whereby the Company acquired all of the issued and outstanding shares of a target company for $2.2 million in cash consideration. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands): Fair Value Fair value of net assets acquired: Net tangible assets $ 9 Software technology 910 Goodwill 1,285 Total fair value of net assets acquired $ 2,204 Madumbo Acquisition On Business Combination s The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed Fair Value Fair value of net assets acquired: Net tangible assets (liabilities) $ (536 ) Developed technology 825 Goodwill 1,334 Total fair value of net assets acquired $ 1,623 Focusmatic Acquisition On March 28, 2017, the Company completed an acquisition of Focusmatic SAS (“Focusmatic”). Focusmatic is a log processing and analytics company that aligns with the Company’s goal of improving visibility for its customers IT infrastructure. Goodwill was not deductible for tax purposes. Pursuant to the Agreement and Plan of Merger, the entire ownership of Focusmatic was purchased by the Company in exchange for 2,292,012 shares of the Company’s common stock and $5.4 million of cash consideration. Goodwill resulted primarily from the expected integration of the employee base and product offerings of Focusmatic with the Company. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations with the results of Focusmatic’s operations included in the consolidated financial statements from the date of acquisition. Results of operations for this acquisition have been included in the Company’s consolidated statements of operations and comprehensive loss since the acquisition date and were not material. Pro forma results of operations for this acquisition have not been presented because it was also not material to the consolidated results of operations. Transaction costs amounted to approximately $0.1 million and were expensed as incurred. The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands): Fair Value Fair value of purchase consideration: Cash consideration $ 5,397 Common stock 2,015 Total fair value of net assets acquired $ 7,412 Fair Value Fair value of net assets acquired: Net tangible assets (liabilities) $ (200 ) Developed technology 1,300 Customer relationships 20 Goodwill 6,292 Total fair value of net assets acquired $ 7,412 Intangibles, December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortization Period Developed technology $ 3,046 $ (1,611 ) $ 1,435 2-3 years December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortization Period Developed technology $ 2,125 $ (837 ) $ 1,288 2-3 years Customer relationships 20 (20 ) — 1 year Total $ 2,145 $ (857 ) $ 1,288 Intangible As of December 31, 2019, future Amount 2020 $ 675 2021 501 2022 259 Total $ 1,435 The changes Amount Balance as of December 31, 2017 $ 6,292 Madumbo acquisition 1,334 Balance as of December 31, 2018 $ 7,626 2019 acquisition 1,285 Foreign currency translation adjustments 147 Balance as of December 31, 2019 $ 9,058

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	12 Months Ended
Accrued Expenses and Other Current Liabilities	Dec. 31, 2019
Payables And Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	8. Accrued Expenses and Other Accrued December 31, 2019 December 31, 2018 Accrued compensation and commissions $ 21,910 $ 15,229 Accrued expenses 12,692 6,940 Early exercise liability-stock options 1,776 2,931 Payroll and sales taxes 1,626 1,147 Other tax liability 742 516 Deferred rent — 3,527 Total accrued expenses and other current liabilities $ 38,746 $ 30,290

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments Lease Commitment s —The Company has entered into various noncancelable operating leases for its facilities expiring between fiscal 2019 and 2025. Certain operating leases contain provisions under which monthly rent escalates over time. When lease agreements contain escalating rent clauses or free rent periods, the Company recognizes rent expense on a straight-line basis over the term of the lease. Rent expense for the years ended December 31, 2019, 2018 and 2017 was $16.7 million, $10.0 million and $3.8 million, respectively. During 2019, 2018 and 2017, $1.0 million, $0.7 million and $0.1 million, Non-Income s —In January 2015, the Company recorded a $5.0 million contingent Federal payroll tax liability in conjunction with common stock repurchase transactions, as part of a capital raise, with certain of its employees. The potential payroll tax treatment of these transactions was subject to uncertainty, and the contingent payroll tax liability was deemed probable and reasonably estimable. On April 15, 2019, the period of limitations for assessing the contingent Federal payroll tax liability expired and the Company was legally released from being the primary obligor. As a result, the Company recognized a $5.0 million benefit in the operating expenses section of the consolidated statement of operations during the year ended December 31, 2019. 401(k) Plan —The Company sponsors a 401(k) defined contribution plan covering all eligible US employees. Contributions to the 401(k) plan are discretionary. The Company did not make any matching contributions to the 401(k) plan for the years ended December 31, 2019 and 2018. Legal s —The Company is involved from time to time in various claims and legal actions arising in the ordinary course of business. While it is not feasible to predict or determine the ultimate outcome of these matters, the Company believes that none of its current legal proceedings will have a material adverse effect on its financial position or results of operation s . Indemnificatio n —The Company enters into indemnification provisions under some agreements with other parties in the ordinary course of business, including business partners, investors, contractor s , customers, and the Company’s officers, directors and certain employees. The Company has agreed to indemnify and defend the indemnified party claims and related losses suffered or incurred by the indemnified party from actual or threatened third-party claim because of the Company’s activities or non-compliance with certain representations and warranties made by the Company. It is not possible to determine the maximum potential loss under these indemnification provisions due to the Company’s limited history of prior indemnification claims and the unique facts and circumstances involved in each particular provision. To date, losses recorded in the Company’s consolidated statements of operations and comprehensive (loss) income in connection with the indemnification provisions have not been material.

Leases

Leases	12 Months Ended
Leases	Dec. 31, 2019
Leases [Abstract]
Leases	10. Leases The Lease The Year Ended December 31, 2019 Operating lease cost (1) $ 13,636 Variable lease cost (2) 94 Short-term lease cost 2,925 1) Includes 2) Primarily Supplemental Year Ended December 31, 2019 Cash paid for amounts included in measurement of lease liabilities $ 9,767 Operating lease assets obtained in exchange for new lease liabilities 14,618 Maturities Amount 2020 $ 14,576 2021 16,944 2022 16,731 2023 14,569 2024 and beyond 4,017 Total lease payments $ 66,837 Less: imputed interest (6,411 ) Present value of lease liabilities $ 60,426 As of December 31, 2019, the Company had one additional operating lease that has not yet commenced. Weighted December 31, 2019 Weighted average remaining lease term (years) 4.00 Weighted average discount rate 4.98 %

Stockholders' Equity (Deficit)

Stockholders' Equity (Deficit)	12 Months Ended
Stockholders' Equity (Deficit)	Dec. 31, 2019
Equity [Abstract]
Stockholders' Equity (Deficit)	11. Stockholders’ Equity (Deficit) In January In As of December 31, 2019, the Company had authorized 2,000,000,000 shares of Class A common stock and 310,000,000 shares of Class B common stock, each at a par value per share of $0.00001, of which 64,308,498 shares of Class A common stock and 232,078,452 shares of Class B common stock were issued and outstanding. At December 31, 2019 and 2018, December 31, 2019 2018 Seed Preferred Stock — 19,403,952 Series A Preferred Stock — 49,195,632 Series B Preferred Stock — 39,619,992 Series C Preferred Stock — 30,389,424 Series D Preferred Stock — 41,205,912 2012 and 2019 stock option plans: Options and RSU's outstanding 37,031,861 38,865,057 Shares available for future option and RSU grants 31,729,237 69,225 Shares available subject to the 2019 ESPP Plan 6,725,000 — 75,486,098 218,749,194 Convertible Preferred Stock —Immediately prior to the completion of the IPO in September 2019, all shares of convertible preferred stock then outstanding were converted into 179,011,431 shares of Class B common stock. Class A and Class B Common Stock — The Company has two classes of common stock, Class A and Class B. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder, and are automatically converted upon sale or transfer to Class A common stock, subject to certain limited exceptions. During the year ended December 31, 2019, 36,464,053 shares of Class B common stock were converted into Class A common stock. Employee Stock Purchase Plan —In September 2019, the Board adopted and approved the 2019 ESPP, which became effective on September 18, 2019. The ESPP initially reserved and authorized the issuance of up to a total of 6,725,000 shares of Class A common stock to participating employees. As of December 31, 2019, 6,725,000 shares of Class A common stock remain available for grant under the ESPP. The initial offering period began on September 18, 2019 and will end on May 15, 2020. On each purchase date, eligible employees will purchase the shares at a price per share equal to 85% of the lesser of (1) the $27.00 initial public offering price of the Company’s Class A common stock or (2) the fair market value of the Company’s Class A common stock on the purchase date, as defined in the ESPP. The Company recognized $1.2 million of stock-based compensation expense related to the ESPP during the year ended December 31, 2019, beginning upon the IPO in September 2019. Total compensation cost related to the ESPP not yet recognized was approximately $1.5 million as of December 31, 2019. The weighted average period over which this compensation cost will be recognized is 0.4 years as of December 31, 2019. As of December 31, 2019, $3.3 million has been withheld on behalf of employees for a future purchase under the ESPP. There were no purchases for the year ended December 31, 2019 related to the ESPP. Stock-Based n —The Company has two equity incentive plans, the 2012 equity incentive plan (the “2012 Plan”) and the 2019 equity incentive plan (the “2019 Plan”). On September 18, 2019, the Company ceased granting awards under the 2012 Plan, and all shares that remained available for issuance under the 2012 Plan at that time were transferred to the 2019 Plan. Additionally, as of December 31, 2019, there were 36,364,067 shares of Class A common stock issuable upon conversion of Class B common stock underlying options outstanding under the 2012 Plan. Under the 2019 Plan, the Board and any other committee or subcommittee of the Board may grant stock options, stock appreciation rights, restricted stock awards, RSUs and performance-based and other awards, each valued or based on the Company’s Class A common stock, to employees, consultants, and advisors of the Company. Through December 31, 2019, the Company has only issued stock options and RSUs in connection with the 2012 and 2019 Plans. As of December 31, 2019, the Company was authorized to grant awards representing up to 70,296,733 shares under the 2019 Plan and had awards representing 31,729,237 shares of Class A common stock available to grant under the 2019 Plan. The The following Year Ended December 31, 2019 2018 2017 Expected volatility 38.9% - 39.5% 38.4% - 39.0% 37.1% - 38.8% Risk-free interest rate 1.4% - 2.6% 2.6% - 3.0% 1.8% - 2.2% Expected dividend yield —% —% —% Expected term (in years) 5.2 - 6.3 5.8 - 6.1 5.1 - 6.1 Fair value of common stock $6.16 - $38.21 $2.23 - $5.63 $0.87 - $1.02 Expected y —The Company performed an analysis of its peer companies with similar expected lives to develop an expected volatility assumption. Expected —Derived from the life of the options granted under the option plan and is based on the simplified method which is essentially the weighted average of the vesting period and contractual term. Risk-free e —Based upon quoted market yields for the United States Treasury debt securities. Expected d —Since the Company has never paid and has no intention to pay cash dividends on common stock, the expected dividend yield is zero. Fair k —Prior to the IPO, the fair value of common stock underlying the stock-based awards was determined by the Company’s Board of Directors. The Board of Directors considered numerous objective and subjective factors to determine the fair value of the Company’s common stock at each meeting in which awards were approved. The factors considered included, but were not limited to: (i) the results of contemporaneous independent third-party valuations of the Company’s common stock; (ii) the prices, rights, preferences, and privileges of the Company’s redeemable convertible Preferred Stock relative to those of its common stock; (iii) the lack of marketability of the Company’s common stock; (iv) actual operating and financial results; (v) current business conditions and projections; (vi) the likelihood of achieving a liquidity event, such as an initial public offering or sale of the Company, given prevailing market conditions; and (vii) precedent transactions involving the Company’s shares. Since the Company’s IPO, the fair value of the underlying common stock is determined by the closing price, on the date of grant, of the Company’s Class A common stock, which is traded publicly on The Nasdaq Global Market. Stock Number Of Options Outstanding Weighted- Average Exercise Price Weighted- Average Remaining Contractual Life (in Years) Balance—January 1, 2017 35,825,160 $ 0.39 8.9 Options granted 12,841,968 $ 0.89 Options exercised (2,165,976 ) $ 0.21 Options forfeited (1,623,264 ) $ 0.64 Balance—December 31, 2017 44,877,888 $ 0.53 8.3 Options granted 11,236,803 $ 1.61 Options exercised (14,882,622 ) $ 0.52 Options forfeited (2,367,012 ) $ 0.79 Balance—December 31, 2018 38,865,057 $ 0.83 7.9 Options granted 9,518,730 $ 9.15 Options exercised (10,546,987 ) $ 0.75 Options forfeited (1,452,033 ) $ 2.54 Balance—December 31, 2019 36,384,767 $ 2.96 7.6 Exercisable—December 31, 2019 22,327,967 $ 2.19 7.0 As of December 31, 2019, there were 20,700 shares of Class A common stock and 36,364,067 shares of Class B common stock issuable upon the exercise of options outstanding. The 9, , , Total compensation cost related to unvested stock options not yet recognized was approximately $90.5 million and $28.4 million as of December 31, 2019 and December 31, 2018, respectively. The weighted average period over which this compensation cost related to unvested stock options will be recognized is 2.7 years and 3.4 years as of December 31, 2019 and December 31, 2018, respectively. The following table summarizes the activity for the Company's unvested RSUs: Shares Weighted-Average Fair Value Balance at December 31, 2018 — $ — Granted 647,094 $ 36.08 Vested — $ — Forfeited/canceled — $ — Balance at December 31, 2019 647,094 $ 36.08 In November 2019, the Company granted 244,445 restricted shares of Class A common stock, which are subject to service-based vesting conditions over approximately four years. Total compensation cost related to unvested RSUs and restricted shares of common stock not yet recognized was approximately $30.4 million as of December 31, 2019. The weighted average period over which this compensation cost related to unvested RSUs will be recognized is 3.9 years as of December 31, 2019. The Company expects to settle RSUs with shares of its Class A common stock. Stock-based Year Ended December 31, 2019 2018 2017 Cost of revenue $ 582 $ 287 $ 112 Research and development 7,972 1,641 1,160 Sales and marketing 5,538 1,910 977 General and administrative 4,942 1,406 819 Stock-based compensation, net of amounts capitalized 19,034 5,244 3,068 Capitalized stock-based compensation expense 201 167 248 Total stock-based compensation expense $ 19,235 $ 5,411 $ 3,316 Common The Company has recorded liabilities related to early exercises of 1,239,750 shares of common stock and 2,095,656 shares of common stock as of December 31, 2019 and 2018, respectively.

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Income — For financial reporting purposes, loss before income taxes, includes the following components (in thousands): December 31, 2019 2018 2017 Domestic $ (18,330 ) $ (11,273 ) $ (2,498 ) Foreign 2,354 1,033 385 Loss before income taxes $ (15,976 ) $ (10,240 ) $ (2,113 ) Total 2019 Current Deferred Total Federal $ — $ — $ — State 126 — 126 Foreign 967 (359 ) 608 Total $ 1,093 $ (359 ) $ 734 2018 Current Deferred Total Federal $ — $ — $ — State (127 ) — (127 ) Foreign 559 90 649 Total $ 432 $ 90 $ 522 2017 Current Deferred Total Federal $ 41 $ — $ 41 State 60 — 60 Foreign 477 (121 ) 356 Total $ 578 $ (121 ) $ 457 Tax Rate Reconciliatio n —Income tax expense was $0.7 million, $0.5 million and $0.5 million for the years ended December 31, 2019 , 2018 and 2017, respectively, and differed from the amounts computed by applying the U.S. federal statutory income tax rate of 21 for the years ended December 31, 2019, 2018 and 2017, respectively, to pretax loss from operations as a result of the following (in thousands): December 31, 2019 2018 2017 Income tax expense at federal statutory rate $ (3,355 ) $ (2,151 ) $ (719 ) Nondeductible expenses (1,049 ) 1,289 735 State taxes (net of federal benefit) 100 (100 ) 60 Impacts of United States tax reform—rate change and mandatory repatriation — — 4,353 Change in valuation allowance 5,043 1,052 (4,146 ) Uncertain tax positions 23 241 366 Foreign taxes 92 191 (146 ) Other (120 ) — (46 ) Total $ 734 $ 522 $ 457 On Pursuant In • Reduction n • One-Time t • Valuation Allowances: The Company must assess whether its valuation allowance analyses are affected • Global Components —The tax effects of temporary differences that give rise to the deferred tax assets and deferred tax liabilities at December 31, 2019 and 2018 are presented below (in thousands): December 31, 2019 2018 Deferred tax assets: Net operating losses (federal and state) $ 14,631 $ 7,448 Stock-based compensation 2,085 1,668 Federal withholding tax reserve 815 1,550 Internal use software 1,746 725 Lease liability 10,440 — Other 1,297 2,091 Total deferred tax assets $ 31,014 $ 13,482 Less: valuation allowance (15,205 ) (9,730 ) Net deferred tax assets $ 15,809 $ 3,752 Deferred tax liabilities: Commissions $ (6,514 ) $ (2,796 ) Right of use asset (9,210 ) — Other (85 ) (956 ) Total deferred tax liabilities $ (15,809 ) $ (3,752 ) Net deferred tax assets/liabilities $ — $ — The Utilization of the net operating In general, it is the practice and intention of the Company to reinvest the earnings of its non-U.S. subsidiaries Consistent Income Taxes The 2019, 2018 and 2017 (in thousands): December 31, 2019 2018 2017 Beginning balance $ 920 $ 563 $ — Increases based on tax positions during the current period — 357 563 Ending balance $ 920 $ 920 $ 563 The total amount of unrecognized tax The Company’s policy for classifying interest and penalties associated with The total amount of interest and penalties associated with unrecognized income tax benefits is $0.4 million and $0.4 million for the years ended December 31, 2019 and 2018, respectively. Although The The Company is currently under audit in the U.S., a major tax jurisdiction, for the 2017 tax year.

Net (Loss) Income Per Share

Net (Loss) Income Per Share	12 Months Ended
Net (Loss) Income Per Share	Dec. 31, 2019
Earnings Per Share [Abstract]
Net (Loss) Income Per Share	13. Net (Loss) Income Per Share Basic and diluted net income (loss) per common share is presented in conformity with the two-class method required for participating securities. The following table presents the calculation of basic and diluted net (loss) income per share (in thousands, except per share data): Year Ended December 31, 2019 2018 2017 Basic net loss per share: Class A Class B Numerator: Net loss $ (1,149 ) $ (15,561 ) $ (10,762 ) $ (2,570 ) Denominator: Weighted average shares used in calculating net loss per share, basic 9,611 130,262 70,951 61,321 Basic net loss per share $ (0.12 ) $ (0.12 ) $ (0.15 ) $ (0.04 ) Diluted net loss per share: Numerator: Allocation of distributed loss for basic computation $ (1,149 ) $ (15,561 ) $ (10,762 ) $ (2,570 ) Reallocation of undistributed loss as a result of conversion of Class B to Class A shares (15,561 ) — — — Allocation of undistributed loss $ (16,710 ) $ (15,561 ) $ (10,762 ) $ (2,570 ) Denominator: Number of shares used in basic calculation 9,611 130,262 70,951 61,321 Weighted average effect of diluted securities: Conversion of Class B to Class A common shares outstanding 130,262 — — — Number of shares used in diluted calculation 139,873 130,262 70,951 61,321 Diluted net loss per share $ (0.12 ) $ (0.12 ) $ (0.15 ) $ (0.04 ) Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Convertible Preferred Stock — 179,815 179,815 Shares subject to outstanding stock options and restricted stock units 37,032 38,865 44,877 Unvested early exercised stock options 1,240 2,096 263 Shares subject to the 2019 ESPP Plan 353 — — Total 38,625 220,776 224,955

Subsequent Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events In January 2020, the Company entered into an agreement with Microsoft Azure to purchase an aggregate of at least $21.0 million of cloud services over the course of three years through January 2023.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The
Principles of Consolidation	Principles The r
Initial Public Offering	Initial Public Offering On September 23, 2019, the Company completed its initial public offering (“IPO”), in which the Company issued and sold 24,000,000 shares of its Class A common stock at a public offering price of $27.00 per share, which resulted in net proceeds of $615.6 million after deducting underwriting discounts and commissions. On September 25, 2019, the underwriters exercised their option to purchase an additional 3,600,000 shares of Class A common stock at $27.00 per share, resulting in additional proceeds of $92.3 million, net of underwriters’ discounts and commissions. Immediately prior to the closing of the IPO, all shares of common stock then outstanding were reclassified as Class B common stock and all shares of the convertible preferred stock then outstanding automatically converted into 179,011,431 shares of Class B common stock. The Company incurred $2.0 million of net offering costs in connection with the IPO which were recorded as an offset against IPO proceeds.
Stock Split and Authorized Shares	Stock Split and Authorized Shares On January 2, 2018, the Company’s Board of Directors (the “Board”) and stockholders approved a 4-for-1 stock split of the Company’s then-outstanding common stock and convertible preferred stock was effected without any change in the par value per share. On September 6, 2019, the Board and stockholders approved an amended and restated certificate of incorporation of the Company effecting a 3-for-1 stock split of the Company’s issued and outstanding shares of common stock and convertible preferred stock, and an increase to the authorized shares of the Company’s common stock and convertible preferred stock to 380,000,000 shares and 179,814,912 shares, respectively. The split was effected on September 6, 2019 and without any change in the par value per share. All information related to the Company’s common stock, convertible preferred stock and stock awards has been retroactively adjusted to give effect to the 4-for-1 stock split on January 2, 2018 and 3-for-1 stock split on September 6, 2019. On September 23, 2019, an amended and restated certificate of incorporation of the Company was filed immediately prior to the closing of the IPO authorizing an aggregate of 2,330,000,000 shares of capital stock of the Company, including 2,000,000,000 shares of Class A common stock, 310,000,000 shares of Class B common stock and 20,000,000 shares of preferred stock.
Segment Information	Segment The
Use of Estimates	Use of Estimates The
Foreign Currency Translation	Foreign Currency Translation The ( equity (deficit) Transaction e
Revenue Recognition	Revenue Recognition The Company generates The Company elected to early adopt Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“Topic 606”), effective January 1, 2017, using the full retrospective method of adoption. As such, the consolidated financial statements present revenue in accordance with Topic 606 for all of the periods presented. The Company accounts (1) identify r (2) identify t (3) determine e (4) allocate e (5) recognize n The Company’s s s The transaction price is based on the fixed price for the contracted level of service plus variable consideration for additional optional purchases. Billing periods correspond to the periods over which services are performed and there are no discounts given on the purchase of future services. The Revenue For r The
Cost of Revenue	Cost of Revenue Cost e
Research and Development Costs	Research and Development Research s
Sales and Marketing Costs	Sales and Marketing Sales and marketing primarily
Advertising Costs	Advertising Advertising and
Income Taxes	Income The The
Stock-Based Compensation	Stock-Based The Company recognizes and measures restricted stock units (“RSUs”), and the employee stock purchase plan (the “ESPP”) The Company also has certain options that have performance-based vesting conditions; stock-based compensation expense for such awards is recognized on a straight-line basis from the time the vesting condition is likely to be met through the time the vesting condition has been achieved.
Cash and Cash Equivalents	Cash and Cash Equivalents The
Marketable Securities	Marketable Securities The Company’s marketable securities consist of commercial debt securities, U.S. government treasury securities, and commercial paper. The Company determines the appropriate classification of its marketable securities at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its marketable securities as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its marketable securities within current assets on the consolidated balance sheet. Available-for-sale securities are recorded at fair value each reporting period. Premiums and discounts are amortized or accreted over the life of the related available-for-sale security as an adjustment to yield using the effective interest method. Interest income is recognized when earned. Unrealized gains and losses on these marketable securities are reported as a separate component of accumulated other comprehensive (loss) income on the consolidated balance sheet until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income in the consolidated statements of operations. The Company periodically evaluates its marketable securities to assess whether those with unrealized loss positions are other than temporarily impaired. The Company considers various factors in determining whether to recognize an impairment charge. If the Company determines that the decline in an investment's fair value is other-than-temporary, the difference is recognized as an impairment loss in the consolidated statements of operations. As of December 31, 2019 and 2018, the Company has not recorded any other-than-temporary-impairment charges in its consolidated statements of operations.
Restricted Cash	Restricted Restricted
Concentration of Credit Risk	Concentration Financial There were no customers representing greater than 10% of total revenue for the years ended December 31, 2019, 2018, and 2017. No customers represented greater than 10% of accounts receivable as of December 31, 2019 and 2018.
Geographical Information	Geographical Revenue by location Year Ended December 31, 2019 2018 2017 North America $ 272,190 $ 150,945 $ 76,352 International 90,590 47,132 24,409 Total $ 362,780 $ 198,077 $ 100,761 Other
Fair Value of Financial Instruments	Fair Value of Financial The accounting guidance for -tiered Level Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date. Level Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. Level Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date. The Company’s financial instruments consist of cash equivalents, marketable securities, accounts receivable, accounts payable and accrued expenses. Cash equivalents are stated at amortized cost, which approximates fair value at the balance sheet dates, due to the short period of time to maturity. Marketable securities are recorded at fair value. Accounts receivable, accounts payable, and accrued expenses are stated at their carrying value, which approximates fair value due to the short time to the expected receipt or payment date. A
Accounts Receivable	Accounts Receivable Accounts Unbilled As of December 31, 2019 and 2018, unbilled accounts receivable of approximately $14.4 million and $13.1 million, respectively, was included in accounts receivable on the Company’s consolidated balance sheets.
Internal Use Software Development Costs	Internal The Capitalized
Property and Equipment, Net	Property Property
Deferred Contract Costs	Deferred Sales The The following Amount Balance as of January 1, 2017 $ 2,677 Additions to deferred contract costs 3,352 Amortization of deferred contract costs (1,274 ) Balance as of December 31, 2017 $ 4,755 Additions to deferred contract costs 8,925 Amortization of deferred contract costs (2,671 ) Balance as of December 31, 2018 $ 11,009 Additions to deferred contract costs 20,146 Amortization of deferred contract costs (5,400 ) Balance as of December 31, 2019 $ 25,755
Business Combinations	Business Combinations When e
Accounting for Impairment of Long-Lived Assets (Including Goodwill and Intangibles)	Accounting for Long-lived Computers and equipment 3 years Furnitures and fixtures 5 years Leasehold improvements Shorter of lease term or useful life of asset Capitalized software development costs 2 years Intangible assets 1-3 years The Goodwill
Operating Leases	Operating The Company determines if an arrangement is a lease at inception. Operating lease assets and liabilities are reflected within operating lease assets, operating lease liabilities, current, and operating lease liabilities, non-current, on the consolidated balance sheets. For short-term leases (an initial term of 12 months or less), an operating lease asset and corresponding lease liability are not recorded and the Company records rent expense in its consolidated statements of operations on a straight-line basis over the lease term. Operating lease assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company generally uses its incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. The operating lease assets also include any lease payments made and excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components, which are accounted for separately. Prior to the adoption of ASC 842, Leases
Deferred Revenue	Deferred The Company records contract liabilities to deferred revenue when the Company receives customer payments in advance of the performance obligations being satisfied on the Company’s contracts. Certain of the Company’s customers pay in advance of satisfaction of performance obligations and other customers with monthly contract terms are billed in arrears on a monthly basis. Revenue recognized during the years ended December 31, 2019, 2018 and 2017, which was included in the deferred revenue balances at the beginning of each respective period, was $71.0 million, $37.1 million, and $9.2 million. Remaining .
Net Income (Loss) Per Share Attributable to Common Shareholders	Net Income Basic
Accounting Pronouncements Recently Adopted	Accounting Pronouncements In B Income Taxes (Topic 740), Balance Sheet Classification of Deferred Tax In Statement of Cash Flows In Statement of Cash Flows In Leases (ASC 842) In — Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accountin g
Accounting Pronouncements Not Yet Adopted	Accounting Pronouncements In Intangibles—Goodwill and Other—Internal-Use Softwar e In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments— Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) Simplifying the Accounting for Income Taxes

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Schedule of Revenue by Geographic Area	Revenue by location Year Ended December 31, 2019 2018 2017 North America $ 272,190 $ 150,945 $ 76,352 International 90,590 47,132 24,409 Total $ 362,780 $ 198,077 $ 100,761
Schedule of Deferred Contract Costs	The following Amount Balance as of January 1, 2017 $ 2,677 Additions to deferred contract costs 3,352 Amortization of deferred contract costs (1,274 ) Balance as of December 31, 2017 $ 4,755 Additions to deferred contract costs 8,925 Amortization of deferred contract costs (2,671 ) Balance as of December 31, 2018 $ 11,009 Additions to deferred contract costs 20,146 Amortization of deferred contract costs (5,400 ) Balance as of December 31, 2019 $ 25,755
Schedule of Long-lived Assets Amortized Over Estimated Useful Lives	Long-lived Computers and equipment 3 years Furnitures and fixtures 5 years Leasehold improvements Shorter of lease term or useful life of asset Capitalized software development costs 2 years Intangible assets 1-3 years

Marketable Securities (Tables)

Marketable Securities (Tables)	12 Months Ended
Marketable Securities (Tables)	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Summary of Available-for-Sale Marketable Securities	The following is a summary of available-for-sale marketable securities, excluding those securities classified within cash and cash equivalents on the consolidated balance sheet as of December 31, 2019 (in thousands): Amortized Cost Unrealized Gain Unrealized Losses Fair Value Commercial debt securities $ 80,376 $ 46 $ (5 ) $ 80,417 U.S. government treasury securities 72,467 10 (4 ) 72,473 Commercial paper 23,784 — — 23,784 Marketable securities $ 176,627 $ 56 $ (9 ) $ 176,674
Summary of Fair Values of Available-for-Sale Marketable Securities, by Remaining Contractual Maturity	As of December 31, 2019, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands): Due within one year $ 97,816 Due in one year through five years 78,858 Total $ 176,674

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of December 31, 2019 and 2018, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands): Fair Value Measurement as of December 31, 2019 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 588,762 $ — $ — $ 588,762 Marketable Securities: Corporate debt securities — 80,417 — 80,417 U.S. government treasury securities — 72,473 — 72,473 Commercial paper — 23,784 — 23,784 Total financial assets $ 588,762 $ 176,674 $ — $ 765,436 Fair Value Measurement as of December 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 47,187 $ — $ — $ 47,187 Total financial assets $ 47,187 $ — $ — $ 47,187

Prepaid Expenses and Other Cu_2

Prepaid Expenses and Other Current Assets (Tables)	12 Months Ended
Prepaid Expenses and Other Current Assets (Tables)	Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid December 31, 2019 December 31, 2018 Hosting $ 9,180 $ 3,356 General prepaid expenses 5,700 3,607 Other receivables 2,578 526 Rent 821 1,066 Marketing 516 218 Restricted cash 436 — Total prepaid expenses and other current assets $ 19,231 $ 8,773

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
Property and Equipment, Net (Tables)	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Components of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): December 31, 2019 December 31, 2018 Computers and equipment $ 7,536 $ 4,540 Furniture and fixtures 4,804 2,621 Leasehold improvements 16,517 8,554 Capitalized software development costs 24,630 15,000 Total property and equipment $ 53,487 $ 30,715 Less: accumulated depreciation and amortization (20,738 ) (9,066 ) Total property and equipment, net $ 32,749 $ 21,649

Acquisition, Intangible Asset_2

Acquisition, Intangible Assets and Goodwill (Tables)	12 Months Ended
Acquisition, Intangible Assets and Goodwill (Tables)	Dec. 31, 2019
Schedule of Intangibles, Net	Intangibles, December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortization Period Developed technology $ 3,046 $ (1,611 ) $ 1,435 2-3 years December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortization Period Developed technology $ 2,125 $ (837 ) $ 1,288 2-3 years Customer relationships 20 (20 ) — 1 year Total $ 2,145 $ (857 ) $ 1,288
Schedule of Future Amortization Expense	As of December 31, 2019, future Amount 2020 $ 675 2021 501 2022 259 Total $ 1,435
Schedule of Changes in Carrying Amount of Goodwill	The changes Amount Balance as of December 31, 2017 $ 6,292 Madumbo acquisition 1,334 Balance as of December 31, 2018 $ 7,626 2019 acquisition 1,285 Foreign currency translation adjustments 147 Balance as of December 31, 2019 $ 9,058
2019 Acquisition
Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities	The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands): Fair Value Fair value of net assets acquired: Net tangible assets $ 9 Software technology 910 Goodwill 1,285 Total fair value of net assets acquired $ 2,204
Madumbo
Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities	The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed Fair Value Fair value of net assets acquired: Net tangible assets (liabilities) $ (536 ) Developed technology 825 Goodwill 1,334 Total fair value of net assets acquired $ 1,623
Focusmatic Acquisition
Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities	The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands): Fair Value Fair value of purchase consideration: Cash consideration $ 5,397 Common stock 2,015 Total fair value of net assets acquired $ 7,412 Fair Value Fair value of net assets acquired: Net tangible assets (liabilities) $ (200 ) Developed technology 1,300 Customer relationships 20 Goodwill 6,292 Total fair value of net assets acquired $ 7,412

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
Accrued Expenses and Other Current Liabilities (Tables)	Dec. 31, 2019
Payables And Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued December 31, 2019 December 31, 2018 Accrued compensation and commissions $ 21,910 $ 15,229 Accrued expenses 12,692 6,940 Early exercise liability-stock options 1,776 2,931 Payroll and sales taxes 1,626 1,147 Other tax liability 742 516 Deferred rent — 3,527 Total accrued expenses and other current liabilities $ 38,746 $ 30,290

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2019
Leases [Abstract]
Summary of Components of Lease Cost Recognized	The Year Ended December 31, 2019 Operating lease cost (1) $ 13,636 Variable lease cost (2) 94 Short-term lease cost 2,925 1) Includes 2) Primarily
Summary of Supplemental Cash Flow Information and Non-cash Activity	Supplemental Year Ended December 31, 2019 Cash paid for amounts included in measurement of lease liabilities $ 9,767 Operating lease assets obtained in exchange for new lease liabilities 14,618
Summary of Maturities of Lease Liabilities	Maturities Amount 2020 $ 14,576 2021 16,944 2022 16,731 2023 14,569 2024 and beyond 4,017 Total lease payments $ 66,837 Less: imputed interest (6,411 ) Present value of lease liabilities $ 60,426
Summary of Weighted Average Remaining Lease Term and Discount Rate	Weighted December 31, 2019 Weighted average remaining lease term (years) 4.00 Weighted average discount rate 4.98 %

Stockholders' Equity (Deficit)

Stockholders' Equity (Deficit) (Tables)	12 Months Ended
Stockholders' Equity (Deficit) (Tables)	Dec. 31, 2019
Equity [Abstract]
Summary of Reserved Shares of Common Stock for Future Issuance	At December 31, 2019 and 2018, December 31, 2019 2018 Seed Preferred Stock — 19,403,952 Series A Preferred Stock — 49,195,632 Series B Preferred Stock — 39,619,992 Series C Preferred Stock — 30,389,424 Series D Preferred Stock — 41,205,912 2012 and 2019 stock option plans: Options and RSU's outstanding 37,031,861 38,865,057 Shares available for future option and RSU grants 31,729,237 69,225 Shares available subject to the 2019 ESPP Plan 6,725,000 — 75,486,098 218,749,194
Summary of Fair Value Assumptions	The following Year Ended December 31, 2019 2018 2017 Expected volatility 38.9% - 39.5% 38.4% - 39.0% 37.1% - 38.8% Risk-free interest rate 1.4% - 2.6% 2.6% - 3.0% 1.8% - 2.2% Expected dividend yield —% —% —% Expected term (in years) 5.2 - 6.3 5.8 - 6.1 5.1 - 6.1 Fair value of common stock $6.16 - $38.21 $2.23 - $5.63 $0.87 - $1.02
Summary of Stock Option Activity	Stock Number Of Options Outstanding Weighted- Average Exercise Price Weighted- Average Remaining Contractual Life (in Years) Balance—January 1, 2017 35,825,160 $ 0.39 8.9 Options granted 12,841,968 $ 0.89 Options exercised (2,165,976 ) $ 0.21 Options forfeited (1,623,264 ) $ 0.64 Balance—December 31, 2017 44,877,888 $ 0.53 8.3 Options granted 11,236,803 $ 1.61 Options exercised (14,882,622 ) $ 0.52 Options forfeited (2,367,012 ) $ 0.79 Balance—December 31, 2018 38,865,057 $ 0.83 7.9 Options granted 9,518,730 $ 9.15 Options exercised (10,546,987 ) $ 0.75 Options forfeited (1,452,033 ) $ 2.54 Balance—December 31, 2019 36,384,767 $ 2.96 7.6 Exercisable—December 31, 2019 22,327,967 $ 2.19 7.0
Summary of Activity for Unvested RSUs	The following table summarizes the activity for the Company's unvested RSUs: Shares Weighted-Average Fair Value Balance at December 31, 2018 — $ — Granted 647,094 $ 36.08 Vested — $ — Forfeited/canceled — $ — Balance at December 31, 2019 647,094 $ 36.08
Summary of Stock-based Compensation Expense	Stock-based Year Ended December 31, 2019 2018 2017 Cost of revenue $ 582 $ 287 $ 112 Research and development 7,972 1,641 1,160 Sales and marketing 5,538 1,910 977 General and administrative 4,942 1,406 819 Stock-based compensation, net of amounts capitalized 19,034 5,244 3,068 Capitalized stock-based compensation expense 201 167 248 Total stock-based compensation expense $ 19,235 $ 5,411 $ 3,316

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Components of Loss before Income Taxes	Income — For financial reporting purposes, loss before income taxes, includes the following components (in thousands): December 31, 2019 2018 2017 Domestic $ (18,330 ) $ (11,273 ) $ (2,498 ) Foreign 2,354 1,033 385 Loss before income taxes $ (15,976 ) $ (10,240 ) $ (2,113 )
Summary of Income Taxes Allocated to Operations	Total 2019 Current Deferred Total Federal $ — $ — $ — State 126 — 126 Foreign 967 (359 ) 608 Total $ 1,093 $ (359 ) $ 734 2018 Current Deferred Total Federal $ — $ — $ — State (127 ) — (127 ) Foreign 559 90 649 Total $ 432 $ 90 $ 522 2017 Current Deferred Total Federal $ 41 $ — $ 41 State 60 — 60 Foreign 477 (121 ) 356 Total $ 578 $ (121 ) $ 457
Summary of Tax Rate Reconciliation	Tax Rate Reconciliatio n —Income tax expense was $0.7 million, $0.5 million and $0.5 million for the years ended December 31, 2019 , 2018 and 2017, respectively, and differed from the amounts computed by applying the U.S. federal statutory income tax rate of 21 for the years ended December 31, 2019, 2018 and 2017, respectively, to pretax loss from operations as a result of the following (in thousands): December 31, 2019 2018 2017 Income tax expense at federal statutory rate $ (3,355 ) $ (2,151 ) $ (719 ) Nondeductible expenses (1,049 ) 1,289 735 State taxes (net of federal benefit) 100 (100 ) 60 Impacts of United States tax reform—rate change and mandatory repatriation — — 4,353 Change in valuation allowance 5,043 1,052 (4,146 ) Uncertain tax positions 23 241 366 Foreign taxes 92 191 (146 ) Other (120 ) — (46 ) Total $ 734 $ 522 $ 457
Components of Deferred Tax Assets and Liabilities	Components —The tax effects of temporary differences that give rise to the deferred tax assets and deferred tax liabilities at December 31, 2019 and 2018 are presented below (in thousands): December 31, 2019 2018 Deferred tax assets: Net operating losses (federal and state) $ 14,631 $ 7,448 Stock-based compensation 2,085 1,668 Federal withholding tax reserve 815 1,550 Internal use software 1,746 725 Lease liability 10,440 — Other 1,297 2,091 Total deferred tax assets $ 31,014 $ 13,482 Less: valuation allowance (15,205 ) (9,730 ) Net deferred tax assets $ 15,809 $ 3,752 Deferred tax liabilities: Commissions $ (6,514 ) $ (2,796 ) Right of use asset (9,210 ) — Other (85 ) (956 ) Total deferred tax liabilities $ (15,809 ) $ (3,752 ) Net deferred tax assets/liabilities $ — $ —
Summary of Changes in Gross Amount of Unrecognized Tax Benefits	The 2019, 2018 and 2017 (in thousands): December 31, 2019 2018 2017 Beginning balance $ 920 $ 563 $ — Increases based on tax positions during the current period — 357 563 Ending balance $ 920 $ 920 $ 563

Net (Loss) Income Per Share (Ta

Net (Loss) Income Per Share (Tables)	12 Months Ended
Net (Loss) Income Per Share (Tables)	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Calculation of Basic and Diluted Net (Loss) Income Per Share	The following table presents the calculation of basic and diluted net (loss) income per share (in thousands, except per share data): Year Ended December 31, 2019 2018 2017 Basic net loss per share: Class A Class B Numerator: Net loss $ (1,149 ) $ (15,561 ) $ (10,762 ) $ (2,570 ) Denominator: Weighted average shares used in calculating net loss per share, basic 9,611 130,262 70,951 61,321 Basic net loss per share $ (0.12 ) $ (0.12 ) $ (0.15 ) $ (0.04 ) Diluted net loss per share: Numerator: Allocation of distributed loss for basic computation $ (1,149 ) $ (15,561 ) $ (10,762 ) $ (2,570 ) Reallocation of undistributed loss as a result of conversion of Class B to Class A shares (15,561 ) — — — Allocation of undistributed loss $ (16,710 ) $ (15,561 ) $ (10,762 ) $ (2,570 ) Denominator: Number of shares used in basic calculation 9,611 130,262 70,951 61,321 Weighted average effect of diluted securities: Conversion of Class B to Class A common shares outstanding 130,262 — — — Number of shares used in diluted calculation 139,873 130,262 70,951 61,321 Diluted net loss per share $ (0.12 ) $ (0.12 ) $ (0.15 ) $ (0.04 )
Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations	Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Convertible Preferred Stock — 179,815 179,815 Shares subject to outstanding stock options and restricted stock units 37,032 38,865 44,877 Unvested early exercised stock options 1,240 2,096 263 Shares subject to the 2019 ESPP Plan 353 — — Total 38,625 220,776 224,955

Organization and Description _2

Organization and Description of Business - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Date of Incorporation	Jun. 4, 2010

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	Sep. 25, 2019USD ($)$ / sharesshares	Sep. 23, 2019USD ($)$ / sharesshares	Sep. 06, 2019shares	Jan. 02, 2018	Dec. 31, 2019USD ($)SegmentCustomershares	Dec. 31, 2018USD ($)Customershares	Dec. 31, 2017USD ($)Customer	Jan. 01, 2019USD ($)	Jan. 01, 2017USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs					$ 706,317,000
Stock split, conversion ratio			0.333	0.25
Common stock, shares authorized \| shares		2,330,000,000	380,000,000		0	380,000,000
Preferred stock, shares authorized \| shares		20,000,000			20,000,000	0
Number of operating segment \| Segment					1
Number of reportable segment \| Segment					1
Other-than-temporary-impairment charges					$ 0	$ 0
Allowance for doubtful accounts receivable deemed uncollectible					$ 900,000	400,000
Deferred contract costs amortization period					4 years
Sales commissions related to renewals					$ 0
Impairment of goodwill					0	0	$ 0
Revenue recognized					71,000,000	37,100,000	$ 9,200,000
Operating lease assets					53,002,000			$ 47,900,000
Lease liability					60,426,000			$ 51,400,000
Adoption of ASU 606 \| Accumulated Deficit
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Decrease to accumulated deficit									$ 2,700,000
Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Unbilled accounts receivable					$ 14,400,000	$ 13,100,000
Other than United States
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing greater than 10% \| Customer					0	0	0
United States
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of long lived assets					70.00%	85.00%
Europe
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of long lived assets					30.00%	15.00%
Customer Concentration Risk \| Revenue
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing greater than 10% \| Customer					0	0	0
Customer Concentration Risk \| Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing greater than 10% \| Customer					0	0
Sales and Marketing
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Advertising costs					$ 9,500,000	$ 8,300,000	$ 4,400,000
Initial Public Offering
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net offering costs					$ 2,000,000
Class A Common Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs		$ 615,600,000
Common stock, shares authorized \| shares		2,000,000,000			2,000,000,000	0
Class A Common Stock \| Initial Public Offering
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued \| shares		24,000,000
Common stock offering price \| $ / shares		$ 27
Class A Common Stock \| Underwriters
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued \| shares	3,600,000
Common stock offering price \| $ / shares	$ 27
Net proceeds from common stock shares issued	$ 92,300,000
Class B Common Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock converted into common stock \| shares		179,011,431
Common stock, shares authorized \| shares		310,000,000			310,000,000	0
Class B Common Stock \| Initial Public Offering
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock converted into common stock \| shares		179,011,431
Convertible Preferred Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock, shares authorized \| shares			179,814,912		0	179,814,912

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue by geographic area	$ 362,780	$ 198,077	$ 100,761
North America
Disaggregation Of Revenue [Line Items]
Revenue by geographic area	272,190	150,945	76,352
International
Disaggregation Of Revenue [Line Items]
Revenue by geographic area	$ 90,590	$ 47,132	$ 24,409

Basis of Presentation and Sum_6

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Capitalized Contract Cost [Abstract]
Beginning Balance	$ 11,009	$ 4,755	$ 2,677
Additions to deferred contract costs	20,146	8,925	3,352
Amortization of deferred contract costs	(5,400)	(2,671)	(1,274)
Ending Balance	$ 25,755	$ 11,009	$ 4,755

Basis of Presentation and Sum_7

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Long-lived Assets Amortized Over Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Computers and Equipment
Acquired Finite Lived Intangible Assets [Line Items]
Property and equipment, useful lives	3 years
Furnitures and Fixtures
Acquired Finite Lived Intangible Assets [Line Items]
Property and equipment, useful lives	5 years
Leasehold Improvements
Acquired Finite Lived Intangible Assets [Line Items]
Leasehold improvements, useful life	Shorter of lease term or useful life of asset
Capitalized Software Development Costs
Acquired Finite Lived Intangible Assets [Line Items]
Property and equipment, useful lives	2 years
Minimum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets, useful life	1 year
Maximum
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets, useful life	3 years

Basis of Presentation and Sum_8

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details 1) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining performance obligations		$ 127.1
Remaining performance obligations, expected to recognize period		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining performance obligations	$ 243.8
Remaining performance obligations, expected to recognize period	1 year

Marketable Securities - Summary

Marketable Securities - Summary of Available-for-sale Marketable Securities (Details) $ in Thousands	Dec. 31, 2019USD ($)
Marketable Securities [Line Items]
Marketable securities, Amortized Cost	$ 176,627
Marketable securities, Unrealized Gain	56
Marketable securities, Unrealized Losses	(9)
Marketable securities, Fair Value	176,674
Commercial Debt Securities
Marketable Securities [Line Items]
Marketable securities, Amortized Cost	80,376
Marketable securities, Unrealized Gain	46
Marketable securities, Unrealized Losses	(5)
Marketable securities, Fair Value	80,417
U.S. Government Treasury Securities
Marketable Securities [Line Items]
Marketable securities, Amortized Cost	72,467
Marketable securities, Unrealized Gain	10
Marketable securities, Unrealized Losses	(4)
Marketable securities, Fair Value	72,473
Commercial Paper
Marketable Securities [Line Items]
Marketable securities, Amortized Cost	23,784
Marketable securities, Fair Value	$ 23,784

Marketable Securities - Summa_2

Marketable Securities - Summary of Fair Values of Available-for-Sale Marketable Securities, by Remaining Contractual Maturity (Details) $ in Thousands	Dec. 31, 2019USD ($)
Investments Debt And Equity Securities [Abstract]
Due within one year	$ 97,816
Due in one year through five years	78,858
Total	$ 176,674

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial Assets:
Marketable securities	$ 176,674
Fair Value, Recurring
Financial Assets:
Total financial assets	765,436	$ 47,187
Fair Value, Recurring \| Money Market Funds
Financial Assets:
Cash equivalents	588,762	47,187
Fair Value, Recurring \| Corporate Debt Securities
Financial Assets:
Marketable securities	80,417
Fair Value, Recurring \| U.S. Government Treasury Securities
Financial Assets:
Marketable securities	72,473
Fair Value, Recurring \| Commercial Paper
Financial Assets:
Marketable securities	23,784
Level 1 \| Fair Value, Recurring
Financial Assets:
Total financial assets	588,762	47,187
Level 1 \| Fair Value, Recurring \| Money Market Funds
Financial Assets:
Cash equivalents	588,762	$ 47,187
Level 2 \| Fair Value, Recurring
Financial Assets:
Total financial assets	176,674
Level 2 \| Fair Value, Recurring \| Corporate Debt Securities
Financial Assets:
Marketable securities	80,417
Level 2 \| Fair Value, Recurring \| U.S. Government Treasury Securities
Financial Assets:
Marketable securities	72,473
Level 2 \| Fair Value, Recurring \| Commercial Paper
Financial Assets:
Marketable securities	$ 23,784

Prepaid Expenses and Other Cu_3

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]
Hosting	$ 9,180	$ 3,356
General prepaid expenses	5,700	3,607
Other receivables	2,578	526
Rent	821	1,066
Marketing	516	218
Restricted cash	436
Total prepaid expenses and other current assets	$ 19,231	$ 8,773

Property and Equipment, Net - C

Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment	$ 53,487	$ 30,715
Less: accumulated depreciation and amortization	(20,738)	(9,066)
Total property and equipment, net	32,749	21,649
Computers and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	7,536	4,540
Furnitures and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	4,804	2,621
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	16,517	8,554
Capitalized Software Development Costs
Property Plant And Equipment [Line Items]
Total property and equipment	$ 24,630	$ 15,000

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Depreciation and amortization expense	$ 11.6	$ 5.5	$ 2.2

Acquisition, Intangible Asset_3

Acquisition, Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Thousands	Nov. 06, 2019	Sep. 28, 2018	Mar. 28, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration				$ 2,138	$ 1,618	$ 4,957
Intangible amortization expense				$ 800	$ 500	$ 500
2019 Acquisition
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration	$ 2,200
Madumbo
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration		$ 1,600
Transaction costs		$ 100
Focusmatic
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration			$ 5,400
Transaction costs			$ 100
Issuance of common stock for acquisition			2,292,012

Acquisition, Intangible Asset_4

Acquisition, Intangible Assets and Goodwill - Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities (Details) - USD ($) $ in Thousands	Mar. 28, 2017	Dec. 31, 2019	Nov. 06, 2019	Dec. 31, 2018	Sep. 28, 2018	Dec. 31, 2017
Fair value of net assets acquired:
Goodwill		$ 9,058		$ 7,626		$ 6,292
2019 Acquisition
Fair value of net assets acquired:
Net tangible assets			$ 9
Software technology			910
Goodwill			1,285
Total fair value of net assets acquired			$ 2,204
Madumbo
Fair value of net assets acquired:
Net tangible assets (liabilities)					$ (536)
Developed technology					825
Goodwill					1,334
Total fair value of net assets acquired					$ 1,623
Focusmatic Acquisition
Fair value of net assets acquired:
Net tangible assets (liabilities)	$ (200)
Developed technology	1,300
Customer relationships	20
Goodwill	6,292
Total fair value of net assets acquired	7,412
Fair value of purchase consideration:
Cash consideration	5,397
Common stock	2,015
Total fair value of net assets acquired	$ 7,412

Acquisition, Intangible Asset_5

Acquisition, Intangible Assets and Goodwill - Schedule of Intangibles, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 2,145
Accumulated Amortization		(857)
Net Carrying Amount	$ 1,435	1,288
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,046	2,125
Accumulated Amortization	(1,611)	(837)
Net Carrying Amount	$ 1,435	$ 1,288
Developed Technology \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortization Period	2 years	2 years
Developed Technology \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortization Period	3 years	3 years
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 20
Accumulated Amortization		$ (20)
Amortization Period		1 year

Acquisition, Intangible Asset_6

Acquisition, Intangible Assets and Goodwill - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
2020	$ 675
2021	501
2022	259
Net Carrying Amount	$ 1,435	$ 1,288

Acquisition, Intangible Asset_7

Acquisition, Intangible Assets and Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill beginning balance	$ 7,626	$ 6,292
Foreign currency translation adjustments	147
Goodwill ending balance	9,058	7,626
Madumbo
Goodwill [Line Items]
Acquisition		$ 1,334
2019 Acquisition
Goodwill [Line Items]
Acquisition	$ 1,285

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued compensation and commissions	$ 21,910	$ 15,229
Accrued expenses	12,692	6,940
Early exercise liability-stock options	1,776	2,931
Payroll and sales taxes	1,626	1,147
Other tax liability	742	516
Deferred rent		3,527
Total accrued expenses and other current liabilities	$ 38,746	$ 30,290

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 31, 2015
Commitments And Contingencies [Line Items]
Rent expense	$ 16,700	$ 10,000	$ 3,800
Sublease income	1,000	$ 700	100
Contingent federal payroll tax liability				$ 5,000
Benefit on federal payroll tax liability	$ 5,000		$ (41)
Minimum
Commitments And Contingencies [Line Items]
Noncancelable operating leases	2019
Maximum
Commitments And Contingencies [Line Items]
Noncancelable operating leases	2025

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	12 Months Ended
Leases - Additional Information (Details) $ in Millions	Dec. 31, 2019USD ($)
Lessee Lease Description [Line Items]
Operating lease, option to terminate	option to terminate a lease early within three years
Lessee, Operating Lease, Existence of Option to Terminate [true false]	true
Lessee, operating lease, lease not yet commenced, description	As of December 31, 2019, the Company had one additional operating lease that has not yet commenced. This operating lease will commence in fiscal year 2020 with a lease term of six years. Pursuant to the terms of the office lease, the Company will pay $2.2 million in aggregate through the life of the lease.
Lessee, operating lease, lease not yet commenced, term of contract	6 years
Lessee operating lease commencing period	2020
Aggregate lease amount	$ 2.2
Minimum
Lessee Lease Description [Line Items]
Noncancelable operating lease expiration period	2019
Maximum
Lessee Lease Description [Line Items]
Noncancelable operating lease expiration period	2025
Operating lease, renewal term	5 years
Operating lease, termination term	3 years

Leases - Summary of Components

Leases - Summary of Components of Lease Cost Recognized (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 13,636
Variable lease cost	94
Short-term lease cost	$ 2,925

Leases - Summary of Component_2

Leases - Summary of Components of Lease Cost Recognized (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease, non-cash lease expense	$ 10.4

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information and Non-cash Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in measurement of lease liabilities	$ 9,767
Operating lease assets obtained in exchange for new lease liabilities	$ 14,618

Leases - Summary of Maturities

Leases - Summary of Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2020	$ 14,576
2021	16,944
2022	16,731
2023	14,569
2024 and beyond	4,017
Total lease payments	66,837
Less: imputed interest	(6,411)
Present value of lease liabilities	$ 60,426	$ 51,400

Leases - Summary of Weighted Av

Leases - Summary of Weighted Average Remaining Lease Term and Discount Rate (Details)	Dec. 31, 2019
Leases [Abstract]
Weighted average remaining lease term (years)	4 years
Weighted average discount rate	4.98%

Stockholders' Equity (Deficit_2

Stockholders' Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Thousands	Sep. 18, 2019$ / sharesshares	Nov. 30, 2019shares	Mar. 31, 2019$ / shares	Jun. 30, 2019shares	Dec. 31, 2019USD ($)Vote$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Sep. 23, 2019shares	Sep. 06, 2019shares	Dec. 31, 2016shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital stock purchase price per share \| $ / shares			$ 15.92
Aggregate shares of capital stock				14,366,871
Conversion of preferred stock				803,481
Common stock, shares authorized					0	380,000,000		2,330,000,000	380,000,000
Common stock, par value \| $ / shares					$ 0.00001	$ 0.00001
Common stock, shares issued					0	78,180,606
Common stock, shares outstanding					0	78,180,606
Number of voting rights entitled to stockholders per share					Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share.
Share-based payment arrangement, expense \| $					$ 19,034	$ 5,244	$ 3,068
Stock issuable upon the exercise of options outstanding					36,384,767	38,865,057	44,877,888			35,825,160
Proceeds from exercise of stock options \| $					$ 7,899	$ 7,782	$ 462
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation cost related to unvested awards not yet recognized \| $					$ 90,500	$ 28,400
Weighted average period over compensation cost related to unvested employee awards					2 years 8 months 12 days	3 years 4 months 24 days
Stock based compensation award vesting period					4 years
Weighted average grant-date fair value of options granted \| $ / shares					$ 8.69	$ 2.48	$ 0.40
Proceeds from exercise of stock options \| $					$ 7,900	$ 7,800	$ 500
Intrinsic value of options exercised \| $					121,300	36,400	1,500
Aggregate fair value of options vested \| $					$ 10,800	$ 3,500	$ 4,200
Early exercise of common stock					1,239,750	2,095,656
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period over compensation cost related to unvested employee awards					3 years 10 months 24 days
Common stock granted					647,094
Total compensation cost related to unvested awards not yet recognized \| $					$ 30,400
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of options granted \| $ / shares					$ 38.21	$ 5.63	$ 1.02
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of options granted \| $ / shares					$ 6.16	$ 2.23	$ 0.87
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial offering period					The initial offering period began on September 18, 2019 and will end on May 15, 2020.
Percentage of purchase the shares at a price per share	85.00%
Share-based payment arrangement, expense \| $					$ 1,200
Total compensation cost related to unvested awards not yet recognized \| $					$ 1,500
Weighted average period over compensation cost related to unvested employee awards					4 months 24 days
Amounts withheld on behalf of employees for a future purchase \| $					$ 3,300
2019 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to grant award					70,296,733
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized					2,000,000,000	0		2,000,000,000
Common stock, par value \| $ / shares					$ 0.00001	$ 0.00001
Common stock, shares issued					64,308,498	0
Common stock, shares outstanding					64,308,498	0
Number of voting rights entitled to stockholders per share \| Vote					1
Stock issuable upon the exercise of options outstanding					20,700
Class A Common Stock \| Service-based Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation award vesting period		4 years
Common stock granted		244,445
Class A Common Stock \| Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant					6,725,000
Class A Common Stock \| Employee Stock Purchase Plan \| Initial Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial public offering price \| $ / shares	$ 27
Class A Common Stock \| Employee Stock Purchase Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to grant award	6,725,000
Class A Common Stock \| 2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant					31,729,237
Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized					310,000,000	0		310,000,000
Common stock, par value \| $ / shares					$ 0.00001	$ 0.00001
Common stock, shares issued					232,078,452	0
Common stock, shares outstanding					232,078,452	0
Convertible preferred stock converted into common stock								179,011,431
Number of voting rights entitled to stockholders per share \| Vote					10
Common stock, number of shares converted					36,464,053
Stock issuable upon the exercise of options outstanding					36,364,067
Class B Common Stock \| Initial Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Convertible preferred stock converted into common stock								179,011,431
Class B Common Stock \| 2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of preferred stock					36,364,067

Stockholders' Equity (Deficit_3

Stockholders' Equity (Deficit) - Summary of Reserved Shares of Common Stock for Future Issuance (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance	75,486,098	218,749,194
Seed Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance		19,403,952
Series A Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance		49,195,632
Series B Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance		39,619,992
Series C Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance		30,389,424
Series D Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance		41,205,912
Options and RSU's outstanding
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance	37,031,861	38,865,057
Shares Available for Future Option and RSU Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance	31,729,237	69,225
Shares Available Subject to the 2019 ESPP Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance	6,725,000

Stockholders' Equity (Deficit_4

Stockholders' Equity (Deficit) - Summary of Fair Value Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility minimum	38.90%	38.40%	37.10%
Expected volatility maximum	39.50%	39.00%	38.80%
Risk-free interest rate minimum	1.40%	2.60%	1.80%
Risk-free interest rate maximum	2.60%	3.00%	2.20%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	5 years 2 months 12 days	5 years 9 months 18 days	5 years 1 month 6 days
Fair value of common stock	$ 6.16	$ 2.23	$ 0.87
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years 3 months 18 days	6 years 1 month 6 days	6 years 1 month 6 days
Fair value of common stock	$ 38.21	$ 5.63	$ 1.02

Stockholders' Equity (Deficit_5

Stockholders' Equity (Deficit) - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number Of Options Outstanding
Beginning balance	38,865,057	44,877,888	35,825,160
Options granted	9,518,730	11,236,803	12,841,968
Options exercised	(10,546,987)	(14,882,622)	(2,165,976)
Options forfeited	(1,452,033)	(2,367,012)	(1,623,264)
Ending balance	36,384,767	38,865,057	44,877,888	35,825,160
Exercisable—December 31, 2019	22,327,967
Weighted-Average Exercise Price
Beginning balance	$ 0.83	$ 0.53	$ 0.39
Options granted	9.15	1.61	0.89
Options exercised	0.75	0.52	0.21
Options forfeited	2.54	0.79	0.64
Ending balance	2.96	$ 0.83	$ 0.53	$ 0.39
Exercisable—December 31, 2019	$ 2.19
Weighted-Average Remaining Contractual Life (in Years)
Options outstanding	7 years 7 months 6 days	7 years 10 months 24 days	8 years 3 months 18 days	8 years 10 months 24 days
Options exercisable	7 years

Stockholders' Equity (Deficit_6

Stockholders' Equity (Deficit) - Summary of Activity for Unvested RSUs (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Unvested Shares
Granted \| shares	647,094
Balance at December 31, 2019 \| shares	647,094
Weighted-Average Fair Value
Granted \| $ / shares	$ 36.08
Balance at December 31, 2019 \| $ / shares	$ 36.08

Stockholders' Equity (Deficit_7

Stockholders' Equity (Deficit) - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	$ 19,034	$ 5,244	$ 3,068
Capitalized stock-based compensation expense	201	167	248
Total stock-based compensation expense	19,235	5,411	3,316
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	582	287	112
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	7,972	1,641	1,160
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	5,538	1,910	977
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	$ 4,942	$ 1,406	$ 819

Income Taxes - Components of Lo

Income Taxes - Components of Loss before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic	$ (18,330)	$ (11,273)	$ (2,498)
Foreign	2,354	1,033	385
Loss before provision for income taxes	$ (15,976)	$ (10,240)	$ (2,113)

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Taxes Allocated to Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current, Federal	$ (5,000)		$ 41
Current, State	126	$ (127)	60
Current, Foreign	967	559	477
Current, Total	1,093	432	578
Deferred, Foreign	(359)	90	(121)
Deferred, Total	(359)	90	(121)
Federal			41
State	126	(127)	60
Foreign	608	649	356
Total	$ 734	$ 522	$ 457

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
Income Taxes - Additional Information (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Income tax expense	$ 734,000	$ 522,000	$ 457,000
U.S. federal statutory income tax rate	21.00%	21.00%	34.00%
One-time transition tax payable period on un-repatriated earnings of foreign subsidiaries	8 years
Measurement-period adjustments, tax expense (benefit)		$ 0	$ 4,000,000
Tax Cuts and Jobs Act, Accounting Complete [true false]	true
Tax cuts and jobs act, measurement period adjustment, decrease in effective tax rate		0.21
Tax cuts and jobs act, measurement period adjustment, decrease in deferred tax assets and liabilities			4,000,000
Tax cuts and jobs act, measurement period adjustment, decrease in valuation allowance			$ 4,000,000
Valuation allowance of deferred tax assets	$ 15,205,000	$ 9,730,000
Change in valuation allowance of deferred tax assets	5,500,000	1,200,000
Net operating loss carryforwards for federal tax purposes	$ 56,600,000	28,000,000
Federal net operating loss carryforwards expiration year	2031
Percentage of net operating loss carryforwards subjected to taxable income limitation	80.00%
Net operating loss carryforwards for state tax purposes	$ 42,000,000	24,200,000
State net operating loss carryforwards expiration year	2029
Recognized income tax positions measured at largest amount greater than specified percentage being realized	50.00%
Unrecognized tax benefits that would impact effective tax rate	$ 500,000	800,000
Unrecognized tax benefits, income tax penalties and interest expense	$ 400,000	$ 400,000
Significant change in unrecognized tax benefits, nature of event	Although it is reasonably possible that certain unrecognized tax benefits may increase or decrease within the next 12 months due to tax examination changes, settlement activities, expirations of statute of limitations, or the impact on recognition and measurement considerations related to the results of published tax cases or other similar activities, the Company does not anticipated any significant changes to unrecognized tax benefits over the next 12 months.
Significant change in unrecognized tax benefits is reasonably possible, amount	$ 0
Open tax year	2014
Maximum
Income Taxes [Line Items]
U.S. federal statutory income tax rate			34.00%

Income Taxes - Summary of Tax R

Income Taxes - Summary of Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate	$ (3,355)	$ (2,151)	$ (719)
Nondeductible expenses	(1,049)	1,289	735
State taxes (net of federal benefit)	100	(100)	60
Impacts of United States tax reform—rate change and mandatory repatriation			4,353
Change in valuation allowance	5,043	1,052	(4,146)
Uncertain tax positions	23	241	366
Foreign taxes	92	191	(146)
Other	(120)		(46)
Total	$ 734	$ 522	$ 457

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating losses (federal and state)	$ 14,631	$ 7,448
Stock-based compensation	2,085	1,668
Federal withholding tax reserve	815	1,550
Internal use software	1,746	725
Lease liability	10,440
Other	1,297	2,091
Total deferred tax assets	31,014	13,482
Less: valuation allowance	(15,205)	(9,730)
Net deferred tax assets	15,809	3,752
Deferred tax liabilities:
Commissions	(6,514)	(2,796)
Right of use asset	(9,210)
Other	(85)	(956)
Total deferred tax liabilities	$ (15,809)	$ (3,752)

Income Taxes - Summary of Chang

Income Taxes - Summary of Changes in Gross Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Beginning balance	$ 920	$ 563
Increases based on tax positions during the current period	0	357	$ 563
Ending balance	$ 920	$ 920	$ 563

Net (Loss) Income Per Share - S

Net (Loss) Income Per Share - Schedule of Calculation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic net loss per share:
Net loss	$ (16,710)	$ (10,762)	$ (2,570)
Weighted average shares used in calculating net loss per share, basic		70,951	61,321
Basic net loss per share		$ (0.15)	$ (0.04)
Diluted net loss per share:
Allocation of distributed loss for basic computation		$ (10,762)	$ (2,570)
Allocation of undistributed loss		$ (10,762)	$ (2,570)
Weighted average shares used in calculating net loss per share, basic		70,951	61,321
Number of shares used in diluted calculation		70,951	61,321
Diluted net loss per share		$ (0.15)	$ (0.04)
Class A Common Stock
Basic net loss per share:
Net loss	$ (1,149)
Weighted average shares used in calculating net loss per share, basic	9,611
Basic net loss per share	$ (0.12)
Diluted net loss per share:
Allocation of distributed loss for basic computation	$ (1,149)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares	(15,561)
Allocation of undistributed loss	$ (16,710)
Weighted average shares used in calculating net loss per share, basic	9,611
Conversion of Class B to Class A common shares outstanding	130,262
Number of shares used in diluted calculation	139,873
Diluted net loss per share	$ (0.12)
Class B Common Stock
Basic net loss per share:
Net loss	$ (15,561)
Weighted average shares used in calculating net loss per share, basic	130,262
Basic net loss per share	$ (0.12)
Diluted net loss per share:
Allocation of distributed loss for basic computation	$ (15,561)
Allocation of undistributed loss	$ (15,561)
Weighted average shares used in calculating net loss per share, basic	130,262
Number of shares used in diluted calculation	130,262
Diluted net loss per share	$ (0.12)

Net (Loss) Income Per Share -_2

Net (Loss) Income Per Share - Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations	38,625	220,776	224,955
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations		179,815	179,815
Shares Subject to Outstanding Stock Options and Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations	37,032	38,865	44,877
Unvested Early Exercised Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations	1,240	2,096	263
Shares Subject to the 2019 ESPP Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations	353

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Azure Agreement - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Purchase commitment period		3 years
Subsequent Event \| Minimum
Subsequent Event [Line Items]
Purchase of cloud services	$ 21