Datadog (DDOG) 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 26, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-39051
Entity Registrant Name	Datadog, Inc.
Entity Incorporation, State or Country Code	DE
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
Trading Symbol	DDOG
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001561550
Current Fiscal Year End Date	--12-31
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		257,196,936
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		54,819,432

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 286,966	$ 224,927
Marketable securities	1,180,160	1,292,532
Accounts receivable, net of allowance for credit losses of $2,517 and $2,468 as of September 30, 2021 and December 31, 2020, respectively	224,602	163,359
Deferred contract costs, current	19,933	13,638
Prepaid expenses and other current assets	24,675	23,624
Total current assets	1,736,336	1,718,080
Property and equipment, net	68,820	47,197
Operating lease assets	61,972	57,829
Goodwill	255,735	17,609
Intangible assets, net	12,803	2,069
Deferred contract costs, non-current	35,508	26,750
Restricted cash	3,572	3,784
Other assets	19,427	16,967
TOTAL ASSETS	2,194,173	1,890,285
CURRENT LIABILITIES:
Accounts payable	34,654	21,342
Accrued expenses and other current liabilities	85,173	55,351
Operating lease liabilities, current	19,425	16,326
Deferred revenue, current	300,950	204,825
Total current liabilities	440,202	297,844
Operating lease liabilities, non-current	53,189	51,433
Convertible senior notes, net	734,643	575,864
Deferred revenue, non-current	3,266	3,450
Other liabilities	5,461	4,262
Total liabilities	1,236,761	932,853
COMMITMENTS AND CONTINGENCIES (NOTE 8)
STOCKHOLDERS' EQUITY:
Additional paid-in capital	1,116,872	1,103,305
Accumulated other comprehensive (loss) income	(188)	2,287
Accumulated deficit	(159,275)	(148,163)
Total stockholders’ equity	957,412	957,432
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,194,173	1,890,285
Class A Common Stock
STOCKHOLDERS' EQUITY:
Common stock, value	2	2
Class B Common Stock
STOCKHOLDERS' EQUITY:
Common stock, value	$ 1	$ 1

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts receivable, net of allowance for doubtful accounts	$ 2,517	$ 2,468
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, issued (in shares)	255,875,718	218,510,509
Common stock, outstanding (in shares)	255,875,718	218,510,509
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, authorized (in shares)	310,000,000	310,000,000
Common stock, issued (in shares)	56,025,741	87,369,554
Common stock, outstanding (in shares)	56,025,741	87,369,554

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 270,488	$ 154,675	$ 702,586	$ 425,935
Cost of revenue	63,332	33,984	167,096	89,340
Gross profit	207,156	120,691	535,490	336,595
Operating expenses:
Research and development	112,675	56,440	286,720	142,928
Sales and marketing	75,827	57,142	210,592	153,626
General and administrative	23,549	16,376	65,789	44,876
Total operating expenses	212,051	129,958	563,101	341,430
Operating loss	(4,895)	(9,267)	(27,611)	(4,835)
Other income (loss):
Interest expense	(4,912)	(12,423)	(15,448)	(17,424)
Interest income and other income, net	5,040	7,135	16,105	15,204
Other income (loss), net	128	(5,288)	657	(2,220)
Loss before provision for income taxes	(4,767)	(14,555)	(26,954)	(7,055)
Provision for income taxes	(717)	(595)	(960)	(1,332)
Net loss	(5,484)	(15,150)	(27,914)	(8,387)
Net loss attributable to common stockholders	$ (5,484)	$ (15,150)	$ (27,914)	$ (8,387)
Basic net loss per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Diluted net loss per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Weighted average shares used in calculating basic net loss per share (in shares)	310,247	302,554	308,115	299,105
Weighted average shares used in calculating diluted net loss per share (in shares)	310,247	302,554	308,115	299,105

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,484)	$ (15,150)	$ (27,914)	$ (8,387)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(652)	536	(1,346)	446
Unrealized (loss) income on available-for-sale marketable securities	(368)	44	(1,129)	2,066
Other comprehensive (loss) income	(1,020)	580	(2,475)	2,512
Comprehensive loss	$ (6,504)	$ (14,570)	$ (30,389)	$ (5,875)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in CapitalCumulative Effect, Period of Adoption, Adjustment	Additional Paid-in CapitalCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) IncomeCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated DeficitCumulative Effect, Period of Adoption, Adjustment	Accumulated DeficitCumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance, shares at Dec. 31, 2019				296,386,950
Beginning balance at Dec. 31, 2019	$ 782,341			$ 3		$ 905,821			$ 133		$ (123,616)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				7,555,561
Issuance of common stock upon exercise of stock options	12,391					12,391
Vesting of early exercised stock options	883					883
Vesting of restricted stock units (in shares)				8,234
Issuance of restricted shares of common stock from acquisition (in shares)				120,992
Issuance of restricted shares of common stock from acquisitions	5,169					5,169
Stock-based compensation	51,131					51,131
Issuance of common stock under the Employee Stock Purchase Plan, net of shares withheld for taxes (in shares)				320,104
Issuance of common stock under the Employee Stock Purchase Plan, net of shares withheld for taxes	6,703					6,703
Equity component of 2025 Convertible Senior Notes, net	173,070					173,070
Purchases of capped calls related to 2025 Convertible Senior Notes	(89,625)					(89,625)
Changes in accumulated other comprehensive income	2,512								2,512
Net loss	(8,387)										(8,387)
Ending balance, shares at Sep. 30, 2020				304,391,841
Ending balance at Sep. 30, 2020	936,188			$ 3		1,065,543			2,645		(132,003)
Beginning balance, shares at Dec. 31, 2019				296,386,950
Beginning balance at Dec. 31, 2019	$ 782,341			$ 3		905,821			133		(123,616)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06
Ending balance, shares at Dec. 31, 2020				305,880,063	305,880,063
Ending balance at Dec. 31, 2020	$ 957,432	$ (156,268)	$ 801,164	$ 3	$ 3	1,103,305	$ (173,070)	$ 930,235	2,287	$ 2,287	(148,163)	$ 16,802	$ (131,361)
Beginning balance, shares at Jun. 30, 2020				302,254,533
Beginning balance at Jun. 30, 2020	912,871			$ 3		1,027,656			2,065		(116,853)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				2,132,732
Issuance of common stock upon exercise of stock options	5,156					5,156
Vesting of early exercised stock options	295					295
Vesting of restricted stock units (in shares)				4,576
Stock-based compensation	21,936					21,936
Reversal of prior income tax associated with the issuance of the 2025 convertible senior notes	10,500					10,500
Changes in accumulated other comprehensive income	580								580
Net loss	(15,150)										(15,150)
Ending balance, shares at Sep. 30, 2020				304,391,841
Ending balance at Sep. 30, 2020	936,188			$ 3		1,065,543			2,645		(132,003)
Beginning balance, shares at Dec. 31, 2020				305,880,063	305,880,063
Beginning balance at Dec. 31, 2020	$ 957,432	$ (156,268)	$ 801,164	$ 3	$ 3	1,103,305	$ (173,070)	$ 930,235	2,287	$ 2,287	(148,163)	$ 16,802	$ (131,361)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	4,246,592			4,246,592
Issuance of common stock upon exercise of stock options	$ 10,676					10,676
Vesting of early exercised stock options	533					533
Vesting of restricted stock units (in shares)				1,133,572
Issuance of restricted shares of common stock from acquisition (in shares)				501,583
Issuance of restricted shares of common stock from acquisitions	51,501					51,501
Stock-based compensation	114,133					114,133
Issuance of common stock under the Employee Stock Purchase Plan, net of shares withheld for taxes (in shares)				139,649
Issuance of common stock under the Employee Stock Purchase Plan, net of shares withheld for taxes	9,794					9,794
Changes in accumulated other comprehensive income	(2,475)								(2,475)
Net loss	(27,914)										(27,914)
Ending balance, shares at Sep. 30, 2021				311,901,459
Ending balance at Sep. 30, 2021	957,412			$ 3		1,116,872			(188)		(159,275)
Beginning balance, shares at Jun. 30, 2021				309,841,134
Beginning balance at Jun. 30, 2021	912,879			$ 3		1,065,835			832		(153,791)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				1,715,963
Issuance of common stock upon exercise of stock options	4,459					4,459
Vesting of early exercised stock options	33					33
Vesting of restricted stock units (in shares)				344,362
Stock-based compensation	46,545					46,545
Changes in accumulated other comprehensive income	(1,020)								(1,020)
Net loss	(5,484)										(5,484)
Ending balance, shares at Sep. 30, 2021				311,901,459
Ending balance at Sep. 30, 2021	$ 957,412			$ 3		$ 1,116,872			$ (188)		$ (159,275)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (27,914)	$ (8,387)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,062	11,367
Amortization of discounts or premiums on marketable securities	11,829	5,344
Amortization of issuance costs	2,510	10,546
Amortization of deferred contract costs	12,557	7,348
Stock-based compensation, net of amounts capitalized	107,371	49,610
Non-cash lease expense	12,605	10,004
Allowance for credit losses on accounts receivable	1,226	2,656
Loss on disposal of property and equipment	258	4
Changes in operating assets and liabilities:
Accounts receivable, net	(61,880)	(21,253)
Deferred contract costs	(27,610)	(15,804)
Prepaid expenses and other current assets	(941)	(6,821)
Other assets	(1,844)	(605)
Accounts payable	12,432	6,406
Accrued expenses and other liabilities	19,226	6,884
Deferred revenue	94,865	27,964
Net cash provided by operating activities	170,752	85,263
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(897,412)	(1,477,063)
Maturities of marketable securities	935,692	268,500
Proceeds from sale of marketable securities	61,132	85,700
Purchases of property and equipment	(7,551)	(4,336)
Capitalized software development costs	(19,364)	(14,371)
Cash paid for acquisition of businesses; net of cash acquired	(200,202)	(2,363)
Net cash used in investing activities	(127,705)	(1,143,933)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	10,651	12,354
Initial public offering costs	0	(421)
Proceeds from issuance of common stock under the employee stock purchase plan	9,794	7,680
Employee payroll taxes paid related to net share settlement under the employee stock purchase plan	(245)	(977)
Proceeds from issuance of convertible senior notes, net of issuance costs	0	730,207
Purchase of capped call related to convertible senior notes	0	(89,625)
Net cash provided by financing activities	20,200	659,218
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,420)	393
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	61,827	(399,059)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	228,711	601,189
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—End of period	290,538	202,130
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	939	186
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued property and equipment purchases	1,250	315
Stock-based compensation included in capitalized software development costs	6,762	1,521
Vesting of early exercised options	533	883
Issuance of restricted shares of common stock for the acquisition of businesses	51,501	5,169
Acquisition holdback	1,195	1,500
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH WITHIN THE CONDENSED CONSOLIDATED BALANCE SHEETS TO THE AMOUNTS SHOWN IN THE STATEMENTS OF CASH FLOWS ABOVE:
Cash and cash equivalents	286,966	198,523
Restricted cash	3,572	3,607
Total cash, cash equivalents and restricted cash	$ 290,538	$ 202,130

Organization and Description of

Organization and Description of Business	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Description of Business Datadog, Inc. (“Datadog” or the “Company”) was incorporated in the State of Delaware on June 4, 2010. The Company is the monitoring and analytics platform for developers, IT operations teams and business users in the cloud age. The Company’s SaaS platform integrates and automates infrastructure monitoring, application performance monitoring, log management and security monitoring to provide unified, real-time observability of its customers’ entire technology stack. The Company is headquartered in New York City and has various other global office locations.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Unaudited Interim Condensed Consolidated Financial Information The unaudited condensed consolidated financial statements include the accounts of Datadog, Inc. and its wholly-owned subsidiaries, and have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and following the requirements of the Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by GAAP can be condensed or omitted. These financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for the fair statement of the Company’s financial information. These interim results are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2021 or for any other interim period or for any other future year. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, as filed with the SEC on March 1, 2021 (the “Annual Report”). Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with GAAP. Principles of Consolidation The condensed consolidated financial statements include the accounts of Datadog, Inc. and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Such estimates include the fair value of marketable securities, the allowance for credit losses, the fair value of acquired assets and assumed liabilities from business combinations, useful lives of property, equipment, software and finite lived intangibles, stock-based compensation, valuation of long-lived assets and their recoverability, including goodwill, the incremental borrowing rate for operating leases, estimated expected period of benefit for deferred contract costs, fair value of the liability component of the convertible debt, realization of deferred tax assets and uncertain tax positions, revenue recognition and the allocation of overhead costs between cost of revenue and operating expenses. The Company bases its estimates on historical experience and also on assumptions that management considers reasonable. The Company assesses these estimates on a regular basis; however, actual results could materially differ from these estimates. Accounting Pronouncements Recently Adopted In August 2020, the Financial Accounting Standards Board ("FASB") issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU No. 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity's own equity. Among other changes, ASU No. 2020-06 removes from GAAP the liability and equity separation model for

Marketable Securities

Marketable Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities The following is a summary of available-for-sale marketable securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Amortized Unrealized Unrealized Fair Commercial debt securities $ 917,016 $ 340 $ (296) $ 917,060 Certificates of deposit 23,997 21 — 24,018 U.S. government treasury securities 67,792 62 (22) 67,832 Commercial paper 171,205 45 — 171,250 Marketable securities $ 1,180,010 $ 468 $ (318) $ 1,180,160 December 31, 2020 Amortized Unrealized Unrealized Fair Commercial debt securities $ 926,836 $ 1,157 $ (143) $ 927,850 Certificates of deposit 47,214 43 (1) 47,256 U.S. government treasury securities 108,092 203 (1) 108,294 Commercial paper 209,111 32 (11) 209,132 Marketable securities $ 1,291,253 $ 1,435 $ (156) $ 1,292,532 As of September 30, 2021, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands): Due within one year $ 678,149 Due in one year through five years 502,011 Total $ 1,180,160 The Company does not believe that any unrealized losses are attributable to credit-related factors based on its evaluation of available evidence. To determine whether a decline in value is related to credit loss, the Company evaluates, among other factors: the extent to which the fair value is less than the amortized cost basis, changes to the rating of the security by a rating agency and any adverse conditions specifically related to an issuer of a security or its industry. Unrealized gains and losses on marketable securities are presented net of tax.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 September 30, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands): Fair Value Measurement as of September 30, 2021 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 259,957 $ — $ — $ 259,957 Corporate debt securities — 1,115 — 1,115 Marketable Securities: Corporate debt securities — 917,060 — 917,060 Certificates of deposit — 24,018 — 24,018 U.S. government treasury securities — 67,832 — 67,832 Commercial paper — 171,250 — 171,250 Total financial assets $ 259,957 $ 1,181,275 $ — $ 1,441,232 Fair Value Measurement as of December 31, 2020 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 181,743 $ — $ — $ 181,743 Commercial paper — 25,195 — 25,195 Marketable Securities: Corporate debt securities — 927,850 — 927,850 Certificates of deposit — 47,256 — 47,256 U.S. government treasury securities — 108,294 — 108,294 Commercial paper — 209,132 — 209,132 Total financial assets $ 181,743 $ 1,317,727 $ — $ 1,499,470 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, certificates of deposit 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. In addition to its cash equivalents and marketable securities, the Company measures the fair value of its outstanding convertible senior notes on a quarterly basis for disclosure purposes. The Company considers the fair value of the convertible senior notes to be a Level 2 measurement due to limited trading activity of the convertible senior notes. Refer to Note 7, Convertible Senior Notes , to the condensed consolidated financial statements for further details.

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Property and Equipment, Net Property and equipment, net consisted of the following (in thousands): September 30, December 31, Computers and equipment $ 14,960 $ 11,490 Furniture and fixtures 5,809 5,087 Leasehold improvements 21,329 17,639 Capitalized software development costs 75,970 48,502 Total property and equipment $ 118,068 $ 82,718 Less: accumulated depreciation and amortization (49,248) (35,521) Total property and equipment, net $ 68,820 $ 47,197 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.

Acquisitions, Intangible Assets

Acquisitions, Intangible Assets and Goodwill	9 Months Ended
	Sep. 30, 2021
Acquisitions, Intangible Assets And Goodwill [Abstract]
Acquisitions, Intangible Assets and Goodwill	Acquisitions, Intangible Assets and Goodwill 2021 Acquisitions In April 2021, the Company entered into a Stock Purchase Agreement whereby the Company acquired all of the issued and outstanding shares of a SaaS based security platform company. The consideration was approximately $219.4 million, comprising cash and Class A common stock. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations , and accordingly, the total fair value of the purchase consideration was allocated to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values on the acquisition date. The total preliminary purchase price allocated to intangible assets and goodwill was $12.0 million and $204.3 million, respectively. The resulting goodwill is not deductible for income tax purposes. Intangible assets consisted of developed technology in the amount of $8.7 million and customer relationships in the amount of $3.3 million. The useful life for developed technology and customer relationships are three The purchase price allocation is preliminary. The Company continues to collect information with regard to its estimates and assumptions, including potential liabilities and contingencies. The Company will record adjustments to the fair value of the assets acquired, liabilities assumed and goodwill within the 12 month measurement period, if necessary. Goodwill resulted primarily from the expectation of enhancing the Company's current application security tools. Pro forma results of operations for this acquisition have not been presented because they were not material to the condensed consolidated results of operations. In February 2021, the Company entered into a Stock Purchase Agreement whereby the Company acquired all of the issued and outstanding shares of a target company with the purchase price paid in cash and Class A common stock. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations . The purchase price was allocated to intangible assets in the amount of $1.7 million and goodwill in the amount of $34.3 million based on the respective estimated fair values. Goodwill resulted primarily from the expectation of enhancing the Company's current observability tools. The resulting goodwill is not deductible for income tax purposes. Pro forma results of operations for this acquisition have not been presented because they were not material to the condensed consolidated results of operations. 2020 Acquisition During the year ended December 31, 2020, the Company completed an acquisition with the purchase price in cash and stock. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations . The purchase price was allocated to intangible assets in the amount of $1.5 million and goodwill in the amount of $7.8 million based on the respective estimated fair values. The resulting goodwill is not deductible for income tax purposes. Intangible Assets Intangible assets, net consisted of the following (in thousands): September 30, 2021 Gross Accumulated Net Amortization Developed technology $ 12,860 $ (2,965) $ 9,895 3 years Customer relationships 3,300 (392) 2,908 4 years Total $ 16,160 $ (3,357) $ 12,803 December 31, 2020 Gross Accumulated Net Amortization Developed technology $ 3,331 $ (1,262) $ 2,069 3 years Intangible amortization expense was approximately $1.5 million and $0.3 million for the three months ended September 30, 2021 and 2020, respectively, and $3.0 million and $0.7 million for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, future amortization expense by year is expected to be as follows (in thousands): Amount Remainder of 2021 $ 1,278 2022 5,066 2023 4,544 2024 1,688 2025 227 Total $ 12,803 Goodwill The changes in the carrying amount of goodwill were as follows (in thousands): Amount Balance as of December 31, 2020 $ 17,609 Foreign currency translation adjustments (476) 2021 acquisitions 238,602 Balance as of September 30, 2021 $ 255,735
Acquisitions, Intangible Assets and Goodwill	Acquisitions, Intangible Assets and Goodwill 2021 Acquisitions In April 2021, the Company entered into a Stock Purchase Agreement whereby the Company acquired all of the issued and outstanding shares of a SaaS based security platform company. The consideration was approximately $219.4 million, comprising cash and Class A common stock. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations , and accordingly, the total fair value of the purchase consideration was allocated to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values on the acquisition date. The total preliminary purchase price allocated to intangible assets and goodwill was $12.0 million and $204.3 million, respectively. The resulting goodwill is not deductible for income tax purposes. Intangible assets consisted of developed technology in the amount of $8.7 million and customer relationships in the amount of $3.3 million. The useful life for developed technology and customer relationships are three The purchase price allocation is preliminary. The Company continues to collect information with regard to its estimates and assumptions, including potential liabilities and contingencies. The Company will record adjustments to the fair value of the assets acquired, liabilities assumed and goodwill within the 12 month measurement period, if necessary. Goodwill resulted primarily from the expectation of enhancing the Company's current application security tools. Pro forma results of operations for this acquisition have not been presented because they were not material to the condensed consolidated results of operations. In February 2021, the Company entered into a Stock Purchase Agreement whereby the Company acquired all of the issued and outstanding shares of a target company with the purchase price paid in cash and Class A common stock. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations . The purchase price was allocated to intangible assets in the amount of $1.7 million and goodwill in the amount of $34.3 million based on the respective estimated fair values. Goodwill resulted primarily from the expectation of enhancing the Company's current observability tools. The resulting goodwill is not deductible for income tax purposes. Pro forma results of operations for this acquisition have not been presented because they were not material to the condensed consolidated results of operations. 2020 Acquisition During the year ended December 31, 2020, the Company completed an acquisition with the purchase price in cash and stock. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations . The purchase price was allocated to intangible assets in the amount of $1.5 million and goodwill in the amount of $7.8 million based on the respective estimated fair values. The resulting goodwill is not deductible for income tax purposes. Intangible Assets Intangible assets, net consisted of the following (in thousands): September 30, 2021 Gross Accumulated Net Amortization Developed technology $ 12,860 $ (2,965) $ 9,895 3 years Customer relationships 3,300 (392) 2,908 4 years Total $ 16,160 $ (3,357) $ 12,803 December 31, 2020 Gross Accumulated Net Amortization Developed technology $ 3,331 $ (1,262) $ 2,069 3 years Intangible amortization expense was approximately $1.5 million and $0.3 million for the three months ended September 30, 2021 and 2020, respectively, and $3.0 million and $0.7 million for the nine months ended September 30, 2021 and 2020, respectively. As of September 30, 2021, future amortization expense by year is expected to be as follows (in thousands): Amount Remainder of 2021 $ 1,278 2022 5,066 2023 4,544 2024 1,688 2025 227 Total $ 12,803 Goodwill The changes in the carrying amount of goodwill were as follows (in thousands): Amount Balance as of December 31, 2020 $ 17,609 Foreign currency translation adjustments (476) 2021 acquisitions 238,602 Balance as of September 30, 2021 $ 255,735

Convertible Senior Notes

Convertible Senior Notes	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes On June 2, 2020, the Company issued $747.5 million aggregate principal amount of 0.125% convertible senior notes due 2025 (the “2025 Notes”) in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (“Securities Act”). The total net proceeds from the sale of the 2025 Notes, after deducting the initial purchasers’ discounts and debt issuance costs, were approximately $730.2 million. The 2025 Notes bear interest at a rate of 0.125% per year, payable semiannually in arrears on June 15 and December 15 of each year, beginning on December 15, 2020. The 2025 Notes will mature on June 15, 2025, unless earlier converted, redeemed or repurchased. Holders may convert their notes at their option at any time prior to the close of business on the business day immediately preceding March 15, 2025 only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2020 (and only during such calendar quarter), if the last reported sale price of the Company’s Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any ten consecutive trading day period (the "Measurement Period") in which the trading price per $1,000 principal amount of 2025 Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the Company’s Class A common stock and the conversion rate on each such trading day; (3) if the Company calls such 2025 Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events, as set forth in the indenture governing the 2025 Notes (“the Indenture”). On or after March 15, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their notes, in integral multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances. The conversion rate for the 2025 Notes is initially 10.8338 shares of Class A common stock per $1,000 principal amount of notes (equivalent to an initial conversion price of approximately $92.30 per share of Class A common stock), subject to adjustment as set forth in the Indenture. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at the Company’s election. If the Company satisfies its conversion obligation solely in cash or through payment and delivery, as the case may be, of a combination of cash and shares of Class A common stock, the amount of cash and shares of Class A common stock, if any, due upon conversion will be based on a daily conversion value calculated on a proportionate basis for each trading day in a 30 trading day observation period as described in the Indenture. In addition, if specific corporate events occur prior to the applicable maturity date, or if the Company elects to redeem the 2025 Notes, the Company will increase the conversion rate for a holder who elects to convert their notes in connection with such a corporate event or redemption in certain circumstances. During the three months ended September 30, 2021, the conditional conversion feature of the 2025 Notes was triggered as the last reported sale price of the Company’s Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the quarter ended September 30, 2021 was greater than or equal to 130% of the conversion price on each applicable trading day. Therefore the 2025 Notes are convertible, in whole or in part, at the option of the holders between October 1, 2021 through December 31, 2021. Whether the 2025 Notes will be convertible following such period will depend on the continued satisfaction of this condition or another conversion condition in the future. When a conversion notice is received, the Company has the option to pay or deliver cash, shares of the Company’s common stock, or a combination thereof. As of September 30, 2021, the 2025 Notes were classified as long-term debt on the Company's condensed consolidated balance sheet. The Company may not redeem the 2025 Notes prior to June 20, 2023. On or after June 20, 2023, and prior to the 31st scheduled trading day immediately preceding the maturity date, the Company may redeem for cash all or any portion of the 2025 Notes, at its option, if the last reported sale price of its Class A common stock was at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides a notice of redemption at a redemption price equal to 100% of the principal amount of the 2025 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. In accounting for the issuance of the 2025 Notes, the 2025 Notes were separated into liability and equity components through December 31, 2020. The carrying amount of the liability component was calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the respective 2025 Notes. This difference represents the debt discount that was amortized to interest expense using the effective interest rate method. The carrying amount of the equity component representing the conversion option was $177.2 million. The equity component was recorded in additional paid-in capital. In accounting for the debt issuance costs of $17.3 million related to the 2025 Notes, the Company allocated the total amount incurred to the liability and equity components of the 2025 Notes in the same proportion as the allocation of the proceeds. Issuance costs attributable to the liability component were $13.2 million and will be amortized to interest expense over the contractual term of the 2025 Notes at an effective interest rate of 5.97%. Issuance costs attributable to the equity component were $4.1 million and are netted against the equity component in additional paid-in capital. On January 1, 2021 the Company adopted ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. As a result of the adoption, the debt conversion option of $177.2 million and debt issuance costs of $4.1 million previously attributable to the equity component are no longer presented in equity. Similarly, the debt discount, that is equal to the carrying value of the embedded conversion feature upon issuance, is no longer amortized into income as interest expense over the life of the instrument. This resulted in a $16.8 million decrease to the opening balance of accumulated deficit, a $173.1 million decrease to the opening balance of additional paid-in capital and a $156.3 million increase to the opening balance of convertible senior notes, net on the condensed consolidated balance sheet. The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): September 30, December 31, Convertible senior notes, net: Principal $ 747,500 $ 747,500 Unamortized debt discount (1) — (159,547) Unamortized debt issuance costs (1) (12,857) (12,089) Net carrying amount $ 734,643 $ 575,864 Equity component (1) $ — $ 173,070 1) As noted above, December 31, 2020 amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method. As of September 30, 2021, the total estimated fair value of the 2025 Notes was approximately $1,237.1 million. The fair value was determined based on the closing trading price per $100 of the 2025 Notes as of the last day of trading for the period. The fair value of the 2025 Notes is primarily affected by the trading price of the Company’s Class A common stock and market interest rates. The following table sets forth the interest expense related to the 2025 Notes for the three and nine months ended September 30, 2021 (in thousands): Three Months Ended Nine Months Ended 2021 2020 (1) 2021 2020 (1) Contractual interest expense $ 234 $ 234 $ 701 $ 306 Amortization of debt discount — 7,589 — 9,929 Amortization of issuance costs 838 473 2,510 617 Total $ 1,072 $ 8,296 $ 3,211 $ 10,852 1) As noted above, December 31, 2020 amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method. Capped Calls In connection with the pricing of the 2025 Notes, the Company entered into privately negotiated capped call transactions with certain counterparties (“Capped Calls”). The Capped Calls each have an initial strike price of approximately $92.30 per share, subject to certain adjustments, which corresponds to the initial conversion price of the 2025 Notes. The Capped Calls have initial cap prices of $151.04 per share, subject to certain adjustments. The Capped Calls are expected to partially offset the potential dilution to the Company’s Class A common stock upon any conversion of the 2025 Notes, with such offset subject to a cap based on the cap price. The Capped Calls cover, subject to anti-dilution adjustments, approximately 8.1 million shares of the Company’s Class A common stock. For accounting purposes, the Capped Calls are separate transactions, and not part of the 2025 Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives. The cost of $89.6 million incurred to purchase the Capped Calls was recorded as a reduction to additional paid-in capital and will not be remeasured.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Non-cancelable Material Commitments —During the nine months ended September 30, 2021, other than certain non-cancelable operating leases described in Note 9, Leases , there have been no other material changes outside the ordinary course of business to the Company's contractual obligations and commitments from those disclosed in the Annual Report. 401(k) Plan —The Company sponsors a 401(k) defined contribution plan covering all eligible U.S. employees. Contributions to the 401(k) plan are discretionary. The Company did not make any matching contributions to the 401(k) plan for the three and nine months ended September 30, 2021 and 2020. Legal Matters —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 operations. Indemnification —The Company enters into indemnification provisions under some agreements with other parties in the ordinary course of business, including business partners, investors, contractors, 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 condensed consolidated statements of operations in connection with the indemnification provisions have not been material.

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Leases The Company has entered into various non-cancelable operating leases for its facilities expiring between 2021 and 2030. Certain lease agreements contain an option for the Company to renew a lease for a term of up to four years or an option to terminate a lease early within two years. The Company considers these options, which may be elected at the Company’s sole discretion, in determining the lease term on a lease-by-lease basis. Lease expense for these leases is recognized on a straight-line basis over the lease term, with variable lease payments recognized in the period those payments are incurred. The components of lease cost recognized within the Company’s condensed consolidated statements of operations were as follows (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Operating lease cost (1) $ 5,245 $ 4,252 $ 14,765 $ 12,322 Short-term lease cost 1,075 867 2,528 2,763 1) Includes non-cash lease expense of $4.5 million and $3.4 million for the three months ended September 30, 2021 and 2020, respectively, and $12.6 million and $10.0 million for the nine months ended September 30, 2021 and 2020, respectively. Supplemental cash flow information and non-cash activity related to the Company’s operating leases are as follows (in thousands): Nine Months Ended 2021 2020 Cash paid for amounts included in measurement of lease liabilities $ 14,878 $ 10,622 Operating lease assets obtained in exchange for new lease liabilities 17,476 11,581 Maturities of lease liabilities by fiscal year for the Company’s operating leases are as follows (in thousands): Amount Remainder of 2021 $ 5,063 2022 23,813 2023 20,928 2024 4,938 2025 5,203 2026 and beyond 21,638 Total lease payments $ 81,583 Less: imputed interest (8,969) Present value of lease liabilities $ 72,614 As of September 30, 2021, the Company had one additional operating lease that is set to commence in the fourth quarter of 2021, which is excluded from the table above. The one additional lease has total undiscounted future payments of $4.2 million with a lease term of 8.3 years. Weighted average remaining lease term and discount rate for the Company’s operating leases are as follows: September 30, Weighted-average remaining lease term (years) 4.7 Weighted-average discount rate 4.68 %

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Geographical Information Revenue by location is determined by the billing address of the customer. The following table sets forth revenue by geographic area (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 North America $ 192,269 $ 114,679 $ 503,356 $ 320,166 International 78,219 39,996 199,230 105,769 Total $ 270,488 $ 154,675 $ 702,586 $ 425,935 Deferred Revenue and Remaining Performance Obligations 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. The Company records contract liabilities to deferred revenue when customers are billed or when the Company receives customer payments in advance of the performance obligations being satisfied on the Company’s contracts. Revenue recognized during the three months ended September 30, 2021 and 2020, which was included in the deferred revenue balances at the beginning of each such period, was $131.6 million and $73.3 million, respectively. Revenue recognized during the nine months ended September 30, 2021 and 2020 that was included in the deferred revenue balances at the beginning of each such period was $192.4 million and $121.0 million, respectively. Remaining performance obligations represent the aggregate amount of the transaction price in contracts allocated to performance obligations not delivered, or partially undelivered, as of the end of the reporting period. Remaining performance obligations include unearned revenue, multi-year contracts with future installment payments and certain unfulfilled orders against accepted customer contracts at the end of any given period. As of September 30, 2021 and December 31, 2020, the aggregate transaction price allocated to remaining performance obligations was $718.6 million and $434.1 million, respectively. There is uncertainty in the timing of revenues associated with the Company’s drawdown contracts, as future revenue can often vary significantly from past revenue. However, the Company expects to recognize substantially all of the remaining performance obligations over the next 24 months. Accounts Receivable Accounts receivable deemed uncollectible are charged against the allowance for credit losses when identified. During the nine months ended September 30, 2021 and 2020, the Company charged $1.2 million and $0.9 million, respectively, of accounts receivable deemed uncollectible against the allowance for credit losses. Unbilled accounts receivable represents revenue recognized on contracts for which billings have not yet been presented to customers because the amounts were earned but not contractually billable as of the balance sheet date. The unbilled accounts receivable balance is due within one year. As of September 30, 2021 and December 31, 2020, unbilled accounts receivable of approximately $35.1 million and $20.1 million, respectively, was included in accounts receivable on the Company’s condensed consolidated balance sheets. Deferred Contract Costs Sales commissions earned by the Company’s sales force are considered incremental and recoverable costs of obtaining a contract with a customer. These costs are deferred and then amortized over a period of benefit which is determined to be four years. Amounts expected to be recognized within one year of the balance sheet date are recorded as deferred contract costs, current; the remaining portion is recorded as deferred contract costs, non-current, in the condensed consolidated balance sheets. Deferred contract costs on the Company’s condensed consolidated balance sheets were $55.4 million and $40.4 million as of September 30, 2021 and December 31, 2020, respectively. Amortization expense was $4.7 million and $2.7 million for the three months ended September 30, 2021 and 2020, respectively, and was $12.6 million and $7.3 million for the nine months ended September 30, 2021 and 2020, respectively. The following table represents a rollforward of the Company’s deferred contract costs (in thousands): Amount Balance as of December 31, 2020 $ 40,388 Additions to deferred contract costs 27,610 Amortization of deferred contract costs (12,557) Balance as of September 30, 2021 $ 55,441

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity 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 to Class A common stock upon sale or transfer, subject to certain limited exceptions. During the three and nine months ended September 30, 2021, 14,363,180 shares and 32,379,252 shares of Class B common stock were converted into Class A common stock, respectively. As of September 30, 2021, 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 255,875,718 shares of Class A common stock and 56,025,741 shares of Class B common stock were issued and outstanding. Equity Incentive Plans The Company has two equity incentive plans, the 2012 Equity Incentive Plan (the “2012 Plan”) and the 2019 Equity Incentive Plan (the “2019 Plan”). In connection with the Company's initial public offering of Class A common stock (the "IPO"), 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. 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, restricted stock units (“RSUs”) and performance-based and other awards, each equity award valued or based on the Company’s Class A common stock, to employees, directors, consultants and advisors of the Company. As of September 30, 2021, there were 55,390,029 shares available for grant under the 2019 Plan. Stock Options The following table summarizes the Company’s stock option activity and weighted-average exercise prices: Number Of Weighted- Weighted- Aggregate Balance outstanding—December 31, 2020 27,068,323 $ 3.31 6.7 $ 2,575,069 Options granted — — Options exercised (4,246,592) 2.51 Options forfeited or expired (495,782) 6.84 Balance outstanding—September 30, 2021 22,325,949 $ 3.38 5.8 $ 3,080,305 Ending Exercisable—September 30, 2021 16,428,418 $ 1.98 5.2 $ 2,289,558 As of September 30, 2021, there were 33,421 shares of Class A common stock and 22,292,528 shares of Class B common stock issuable upon the exercise of options outstanding. As of December 31, 2020, there were 34,759 shares of Class A common stock and 27,033,564 shares of Class B common stock issuable upon the exercise of options outstanding. Total compensation cost related to unvested options not yet recognized was approximately $37.8 million and $60.6 million as of September 30, 2021 and December 31, 2020, respectively. The weighted-average period over which this compensation cost related to unvested employee options will be recognized is 1.5 years and 2.0 years as of September 30, 2021 and December 31, 2020, respectively. There were no options granted during the nine months ended September 30, 2021. The weighted-average grant-date fair value of options granted during the nine months ended September 30, 2020 was $16.55. The Company received approximately $10.7 million and $12.4 million in cash proceeds from options exercised during the nine months ended September 30, 2021 and 2020, respectively. The intrinsic value of options exercised during the nine months ended September 30, 2021 and 2020 was approximately $434.1 million and $443.4 million, respectively. The aggregate fair value of options vested during the nine months ended September 30, 2021 and 2020 was $21.5 million and $19.6 million, respectively. Common stock purchased pursuant to an early exercise of stock options is not deemed to be outstanding for accounting purposes until those shares vest. The consideration received for an exercise of an option is considered to be a deposit of the exercise price and the related dollar amount is recorded as a liability. The shares issued upon the early exercise of these unvested stock option awards, which are reflected as exercises in the table above, are considered to be legally issued and outstanding on the date of exercise. Upon termination of service, the Company may repurchase unvested shares acquired through early exercise of stock options at a price equal to the price per share paid upon the exercise of such options. The Company has recorded liabilities related to early exercises of options for 63,000 and 438,750 shares of Class B common stock as of September 30, 2021 and December 31, 2020, respectively. Restricted Stock Units and Restricted Stock Awards The following table summarizes the activity for the Company’s unvested RSUs: Shares Weighted- Balance—December 31, 2020 5,166,720 $ 59.50 Awarded 3,866,023 105.73 Vested (1,133,572) 50.59 Forfeited/canceled (668,835) 63.59 Unvested and outstanding—September 30, 2021 7,230,336 $ 85.23 The Company granted 244,445, 96,210, 117,538 and 245,761 restricted shares of Class A common stock in November 2019, June 2020, February 2021 and April 2021, respectively, in connection with acquisitions 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 $585.3 million and $281.5 million as of September 30, 2021 and December 31, 2020, respectively. The weighted-average period over which this compensation cost related to unvested RSUs and restricted shares will be recognized is 3.1 years and 3.4 years as of September 30, 2021 and December 31, 2020, respectively. Employee Stock Purchase Plan In September 2019, the Board adopted and approved the 2019 Employee Stock Purchase Plan (the “ESPP”), which became effective on the date of the final prospectus for the IPO (the “Final Prospectus”). As of September 30, 2021, 12,142,034 shares of Class A common stock remain available for grant under the ESPP. The ESPP is implemented through a series of offerings under which eligible employees are granted purchase rights to purchase shares of the Company’s Class A common stock on specified dates during such offerings. Under the ESPP, the Company may specify offerings with durations of not more than 27 months, and may specify shorter purchase periods within each offering. On each purchase date, eligible employees will purchase the shares at a price per share equal to 85% of the lesser of (1) the fair market value of the Company’s Class A common stock on the first trading day of the offering period, 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 $2.1 million and $5.7 million of stock-based compensation expense related to the ESPP during the three and nine months ended September 30, 2021, respectively. As of September 30, 2021, $8.7 million has been withheld on behalf of employees for a future purchase under the ESPP due to the timing of payroll deductions. During the nine months ended September 30, 2021, the Company issued 139,649 shares of Class A common stock under the ESPP. Stock-Based Compensation The Company uses the Black-Scholes option-pricing model to estimate the fair value of stock options on the date of grant. The Company recognizes and measures compensation expense for all stock-based payment awards granted to employees, directors and nonemployees based on the fair value of the awards on the date of grant. The determination of the grant date fair value using an option-pricing model is affected by the estimated fair value of the Company’s common stock as well as assumptions regarding a number of other complex and subjective variables. These variables include expected stock price volatility over the expected term of the award, actual and projected employee stock option exercise behaviors, the risk-free interest rate for the expected term of the award and expected dividends. The fair value of RSUs is determined by the closing price on the date of grant of the Company’s Class A common stock, as reported on the Nasdaq Global Select Market. The Company estimates the fair value of the rights to acquire stock under the ESPP using the Black-Scholes option-pricing model. Stock-based compensation is recognized on a straight-line basis over the requisite service period and account for forfeitures as they occur. Stock-based compensation expense was included in the condensed consolidated statement of operations as follows (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Cost of revenue $ 1,427 $ 529 $ 2,957 $ 1,167 Research and development 27,239 10,173 64,947 24,723 Sales and marketing 9,739 6,068 23,355 13,683 General and administrative 5,590 3,946 16,112 10,037 Stock-based compensation, net of amounts capitalized 43,995 20,716 107,371 49,610 Capitalized stock-based compensation expense 2,550 1,220 6,762 1,521 Total stock-based compensation expense $ 46,545 $ 21,936 $ 114,133 $ 51,131

Interest Income and Other Incom

Interest Income and Other Income, Net	9 Months Ended
	Sep. 30, 2021
Interest and Other Income [Abstract]
Interest Income and Other Income, Net	Interest Income and Other Income, Net Interest income and other income, net consist of the following (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Interest income $ 4,830 $ 6,585 $ 15,970 $ 14,734 Other income, net 210 550 135 470 Interest income and other income, net $ 5,040 $ 7,135 $ 16,105 $ 15,204

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company has an effective tax rate of (15.04)% and (4.09)% for the three months ended September 30, 2021 and 2020, respectively, and (3.56)% and (18.88)% for the nine months ended September 30, 2021 and 2020, respectively. The Company has incurred U.S. operating losses and has minimal profits in its foreign jurisdictions. The Company has applied ASC 740, Income Taxes , and has determined that it has uncertain positions that would result in a tax reserve deemed immaterial for each of the nine months ended September 30, 2021 and 2020. The Company’s policy is to recognize interest and penalties related to uncertain tax positions in income tax expense. The Company is subject to U.S. federal tax authority, U.S . state tax authority and foreign tax authority examinations. In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU No. 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity's own equity. The Company chose to early adopt ASU No. 2020-06 on January 1, 2021, using the modified retrospective basis. See Note 2, Basis of Presentation and Summary of Significant Accounting Policies—Accounting Policies Recently Adopted for more information. The early adoption resulted in no material tax impact. The Company has evaluated the available evidence supporting the realization of its deferred tax assets, including the amount and timing of future taxable income, and has determined that it is more likely than not that its net deferred tax assets will not be realized in the United States. Due to uncertainties surrounding the realization of the deferred tax assets, the Company recorded a full valuation allowance against substantially all of its net deferred tax assets. When the Company determines that it will be able to realize some portion or all of its deferred tax assets, an adjustment to its valuation allowance on its deferred tax assets would have the effect of increasing net income in the period such determination is made. On December 21, 2020, Congress passed the Consolidated Appropriations Act, 2021. The act includes the Taxpayer Certainty and Disaster Tax Relief Act of 2020 and the COVID-related Tax Relief Act of 2020, both of which extend many credits and other COVID-19 relief, among other extenders. The Company evaluated the provisions of the Consolidated Appropriations Act, including but not limited to the Employee Retention Credit extension, the extension for the IRC Section 45S credit for paid family and medical leave, and the provision allowing a full deduction for certain business meals, and determined that there was no material impact for the three and nine months ended September 30, 2021.

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share Basic and diluted net loss per common share is presented in conformity with the two-class method required for participating securities. Immediately prior to the consummation of the Company’s IPO in September 2019, all outstanding shares of convertible preferred stock and common stock were converted into shares of Class B common stock. As a result, Class A and Class B common stock are the only outstanding shares of capital stock of the Company. Basic and diluted net loss per share is computed using the weighted-average number of shares of common stock outstanding during the period. The undistributed earnings are allocated based on the contractual participation rights of the Class A and Class B common stock as if the earnings for the year have been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the conversion of Class B common stock is assumed in the computation of the diluted net loss per share of Class A common stock, the undistributed earnings are equal to net loss for that computation. The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Basic net loss per share: Class A Class B Class A Class B Class A Class B Class A Class B Numerator: Net loss $ (4,338) $ (1,146) $ (9,773) $ (5,377) $ (21,287) $ (6,627) $ (4,257) $ (4,130) Denominator: Weighted-average shares used in calculating net loss per share, basic 245,431 64,816 195,176 107,378 234,969 73,146 151,806 147,299 Basic net loss per share $ (0.02) $ (0.02) $ (0.05) $ (0.05) $ (0.09) $ (0.09) $ (0.03) $ (0.03) Diluted net loss per share: Numerator: Allocation of distributed net loss for basic computation $ (4,338) $ (1,146) $ (9,773) $ (5,377) $ (21,287) $ (6,627) $ (4,257) $ (4,130) Reallocation of undistributed net loss as a result of conversion of Class B to Class A shares (1,146) — (5,377) — (6,627) (4,130) — Allocation of undistributed loss $ (5,484) $ (1,146) $ (15,150) $ (5,377) $ (27,914) $ (6,627) $ (8,387) $ (4,130) Denominator: Number of shares used in basic calculation 245,431 64,816 195,176 107,378 234,969 73,146 151,806 147,299 Weighted-average effect of diluted securities: Conversion of Class B to Class A common shares outstanding 64,816 — 107,378 — 73,146 — 147,299 — Number of shares used in diluted calculation 310,247 64,816 302,554 107,378 308,115 73,146 299,105 147,299 Diluted net loss per share $ (0.02) $ (0.02) $ (0.05) $ (0.05) $ (0.09) $ (0.09) $ (0.03) $ (0.03) Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): As of September 30, 2021 2020 Shares subject to outstanding stock options and RSUs 29,556 32,972 Unvested early exercised stock options and restricted shares of common stock 903 919 Shares subject to the employee stock purchase plan 169 131 Shares issuable upon conversion of the convertible senior notes 8,098 — Total 38,726 34,022 ASU No. 2020-06 requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share when the instruments may be settled in cash or shares. See Note 2, Basis of Presentation and Summary of Significant Accounting Policies—Accounting Policies Recently Adopted for more information. During the three months ended September 30, 2021, the conditional conversion feature of the 2025 Notes was triggered and the 2025 Notes are convertible, in whole or in part, at the option of the holders between October 1, 2021 through December 31, 2021. The Company uses the if-converted method for calculating any potential dilutive effect of the conversion options embedded in the 2025 Notes on diluted net income per share; however, since the Company is in a net loss position, there was no dilutive effect during any period presented. The Company entered into Capped Calls in connection with the issuance of the 2025 Notes. The effect of the Capped Calls was also excluded from the calculation of diluted net income per share as the effect of the Capped Calls would have been anti-dilutive. The Capped Calls are expected to partially offset the potential dilution to the Company’s Class A common stock upon any conversion of the 2025 Notes.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in accordance with GAAP.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of Datadog, Inc. and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Such estimates include the fair value of marketable securities, the allowance for credit losses, the fair value of acquired assets and assumed liabilities from business combinations, useful lives of property, equipment, software and finite lived intangibles, stock-based compensation, valuation of long-lived assets and their recoverability, including goodwill, the incremental borrowing rate for operating leases, estimated expected period of benefit for deferred contract costs, fair value of the liability component of the convertible debt, realization of deferred tax assets and uncertain tax positions, revenue recognition and the allocation of overhead costs between cost of revenue and operating expenses. The Company bases its estimates on historical experience and also on assumptions that management considers reasonable. The Company assesses these estimates on a regular basis; however, actual results could materially differ from these estimates.
Accounting Pronouncements Recently Adopted	Accounting Pronouncements Recently Adopted In August 2020, the Financial Accounting Standards Board ("FASB") issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU No. 2020-06”), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity's own equity. Among other changes, ASU No. 2020-06 removes from GAAP the liability and equity separation model for

Marketable Securities (Tables)

Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2021
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 condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020 (in thousands): September 30, 2021 Amortized Unrealized Unrealized Fair Commercial debt securities $ 917,016 $ 340 $ (296) $ 917,060 Certificates of deposit 23,997 21 — 24,018 U.S. government treasury securities 67,792 62 (22) 67,832 Commercial paper 171,205 45 — 171,250 Marketable securities $ 1,180,010 $ 468 $ (318) $ 1,180,160 December 31, 2020 Amortized Unrealized Unrealized Fair Commercial debt securities $ 926,836 $ 1,157 $ (143) $ 927,850 Certificates of deposit 47,214 43 (1) 47,256 U.S. government treasury securities 108,092 203 (1) 108,294 Commercial paper 209,111 32 (11) 209,132 Marketable securities $ 1,291,253 $ 1,435 $ (156) $ 1,292,532
Summary of Fair Values of Available-for-Sale Marketable Securities, by Remaining Contractual Maturity	As of September 30, 2021, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands): Due within one year $ 678,149 Due in one year through five years 502,011 Total $ 1,180,160

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands): Fair Value Measurement as of September 30, 2021 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 259,957 $ — $ — $ 259,957 Corporate debt securities — 1,115 — 1,115 Marketable Securities: Corporate debt securities — 917,060 — 917,060 Certificates of deposit — 24,018 — 24,018 U.S. government treasury securities — 67,832 — 67,832 Commercial paper — 171,250 — 171,250 Total financial assets $ 259,957 $ 1,181,275 $ — $ 1,441,232 Fair Value Measurement as of December 31, 2020 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 181,743 $ — $ — $ 181,743 Commercial paper — 25,195 — 25,195 Marketable Securities: Corporate debt securities — 927,850 — 927,850 Certificates of deposit — 47,256 — 47,256 U.S. government treasury securities — 108,294 — 108,294 Commercial paper — 209,132 — 209,132 Total financial assets $ 181,743 $ 1,317,727 $ — $ 1,499,470

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): September 30, December 31, Computers and equipment $ 14,960 $ 11,490 Furniture and fixtures 5,809 5,087 Leasehold improvements 21,329 17,639 Capitalized software development costs 75,970 48,502 Total property and equipment $ 118,068 $ 82,718 Less: accumulated depreciation and amortization (49,248) (35,521) Total property and equipment, net $ 68,820 $ 47,197

Acquisitions, Intangible Asse_2

Acquisitions, Intangible Assets and Goodwill (Tables)	9 Months Ended
	Sep. 30, 2021
Acquisitions, Intangible Assets And Goodwill [Abstract]
Schedule of Intangible Assets, Net	Intangible assets, net consisted of the following (in thousands): September 30, 2021 Gross Accumulated Net Amortization Developed technology $ 12,860 $ (2,965) $ 9,895 3 years Customer relationships 3,300 (392) 2,908 4 years Total $ 16,160 $ (3,357) $ 12,803 December 31, 2020 Gross Accumulated Net Amortization Developed technology $ 3,331 $ (1,262) $ 2,069 3 years
Schedule of Future Amortization Expense	As of September 30, 2021, future amortization expense by year is expected to be as follows (in thousands): Amount Remainder of 2021 $ 1,278 2022 5,066 2023 4,544 2024 1,688 2025 227 Total $ 12,803
Schedule of Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill were as follows (in thousands): Amount Balance as of December 31, 2020 $ 17,609 Foreign currency translation adjustments (476) 2021 acquisitions 238,602 Balance as of September 30, 2021 $ 255,735

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Summary of Net Carrying Amount of Liability and Equity Component of 2025 Notes	The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): September 30, December 31, Convertible senior notes, net: Principal $ 747,500 $ 747,500 Unamortized debt discount (1) — (159,547) Unamortized debt issuance costs (1) (12,857) (12,089) Net carrying amount $ 734,643 $ 575,864 Equity component (1) $ — $ 173,070 1) As noted above, December 31, 2020 amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
Interest Expense related to 2025 Notes	The following table sets forth the interest expense related to the 2025 Notes for the three and nine months ended September 30, 2021 (in thousands): Three Months Ended Nine Months Ended 2021 2020 (1) 2021 2020 (1) Contractual interest expense $ 234 $ 234 $ 701 $ 306 Amortization of debt discount — 7,589 — 9,929 Amortization of issuance costs 838 473 2,510 617 Total $ 1,072 $ 8,296 $ 3,211 $ 10,852 1) As noted above, December 31, 2020 amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Summary of Components of Lease Cost Recognized	The components of lease cost recognized within the Company’s condensed consolidated statements of operations were as follows (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Operating lease cost (1) $ 5,245 $ 4,252 $ 14,765 $ 12,322 Short-term lease cost 1,075 867 2,528 2,763 1) Includes non-cash lease expense of $4.5 million and $3.4 million for the three months ended September 30, 2021 and 2020, respectively, and $12.6 million and $10.0 million for the nine months ended September 30, 2021 and 2020, respectively.
Summary of Supplemental Cash Flow Information and Non-cash Activity	Supplemental cash flow information and non-cash activity related to the Company’s operating leases are as follows (in thousands): Nine Months Ended 2021 2020 Cash paid for amounts included in measurement of lease liabilities $ 14,878 $ 10,622 Operating lease assets obtained in exchange for new lease liabilities 17,476 11,581
Summary of Maturities of Lease Liabilities	Maturities of lease liabilities by fiscal year for the Company’s operating leases are as follows (in thousands): Amount Remainder of 2021 $ 5,063 2022 23,813 2023 20,928 2024 4,938 2025 5,203 2026 and beyond 21,638 Total lease payments $ 81,583 Less: imputed interest (8,969) Present value of lease liabilities $ 72,614
Summary of Weighted Average Remaining Lease Term and Discount Rate	Weighted average remaining lease term and discount rate for the Company’s operating leases are as follows: September 30, Weighted-average remaining lease term (years) 4.7 Weighted-average discount rate 4.68 %

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Revenue by Geographic Area	Revenue by location is determined by the billing address of the customer. The following table sets forth revenue by geographic area (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 North America $ 192,269 $ 114,679 $ 503,356 $ 320,166 International 78,219 39,996 199,230 105,769 Total $ 270,488 $ 154,675 $ 702,586 $ 425,935
Schedule of Deferred Contract Costs	The following table represents a rollforward of the Company’s deferred contract costs (in thousands): Amount Balance as of December 31, 2020 $ 40,388 Additions to deferred contract costs 27,610 Amortization of deferred contract costs (12,557) Balance as of September 30, 2021 $ 55,441

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Summary of Stock Option Activity and Weighted Average Exercise Prices	The following table summarizes the Company’s stock option activity and weighted-average exercise prices: Number Of Weighted- Weighted- Aggregate Balance outstanding—December 31, 2020 27,068,323 $ 3.31 6.7 $ 2,575,069 Options granted — — Options exercised (4,246,592) 2.51 Options forfeited or expired (495,782) 6.84 Balance outstanding—September 30, 2021 22,325,949 $ 3.38 5.8 $ 3,080,305 Ending Exercisable—September 30, 2021 16,428,418 $ 1.98 5.2 $ 2,289,558
Summary of Activity for Unvested RSUs	The following table summarizes the activity for the Company’s unvested RSUs: Shares Weighted- Balance—December 31, 2020 5,166,720 $ 59.50 Awarded 3,866,023 105.73 Vested (1,133,572) 50.59 Forfeited/canceled (668,835) 63.59 Unvested and outstanding—September 30, 2021 7,230,336 $ 85.23
Summary of Stock-based Compensation Expense	Stock-based compensation expense was included in the condensed consolidated statement of operations as follows (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Cost of revenue $ 1,427 $ 529 $ 2,957 $ 1,167 Research and development 27,239 10,173 64,947 24,723 Sales and marketing 9,739 6,068 23,355 13,683 General and administrative 5,590 3,946 16,112 10,037 Stock-based compensation, net of amounts capitalized 43,995 20,716 107,371 49,610 Capitalized stock-based compensation expense 2,550 1,220 6,762 1,521 Total stock-based compensation expense $ 46,545 $ 21,936 $ 114,133 $ 51,131

Interest Income and Other Inc_2

Interest Income and Other Income, Net (Tables)	9 Months Ended
	Sep. 30, 2021
Interest and Other Income [Abstract]
Schedule of Interest Income and Other Income, Net	Interest income and other income, net consist of the following (in thousands): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Interest income $ 4,830 $ 6,585 $ 15,970 $ 14,734 Other income, net 210 550 135 470 Interest income and other income, net $ 5,040 $ 7,135 $ 16,105 $ 15,204

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): Three Months Ended Nine Months Ended 2021 2020 2021 2020 Basic net loss per share: Class A Class B Class A Class B Class A Class B Class A Class B Numerator: Net loss $ (4,338) $ (1,146) $ (9,773) $ (5,377) $ (21,287) $ (6,627) $ (4,257) $ (4,130) Denominator: Weighted-average shares used in calculating net loss per share, basic 245,431 64,816 195,176 107,378 234,969 73,146 151,806 147,299 Basic net loss per share $ (0.02) $ (0.02) $ (0.05) $ (0.05) $ (0.09) $ (0.09) $ (0.03) $ (0.03) Diluted net loss per share: Numerator: Allocation of distributed net loss for basic computation $ (4,338) $ (1,146) $ (9,773) $ (5,377) $ (21,287) $ (6,627) $ (4,257) $ (4,130) Reallocation of undistributed net loss as a result of conversion of Class B to Class A shares (1,146) — (5,377) — (6,627) (4,130) — Allocation of undistributed loss $ (5,484) $ (1,146) $ (15,150) $ (5,377) $ (27,914) $ (6,627) $ (8,387) $ (4,130) Denominator: Number of shares used in basic calculation 245,431 64,816 195,176 107,378 234,969 73,146 151,806 147,299 Weighted-average effect of diluted securities: Conversion of Class B to Class A common shares outstanding 64,816 — 107,378 — 73,146 — 147,299 — Number of shares used in diluted calculation 310,247 64,816 302,554 107,378 308,115 73,146 299,105 147,299 Diluted net loss per share $ (0.02) $ (0.02) $ (0.05) $ (0.05) $ (0.09) $ (0.09) $ (0.03) $ (0.03)
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): As of September 30, 2021 2020 Shares subject to outstanding stock options and RSUs 29,556 32,972 Unvested early exercised stock options and restricted shares of common stock 903 919 Shares subject to the employee stock purchase plan 169 131 Shares issuable upon conversion of the convertible senior notes 8,098 — Total 38,726 34,022

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 957,412	$ 912,879		$ 957,432	$ 936,188	$ 912,871	$ 782,341
Convertible senior notes, net	734,643			575,864
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				(156,268)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Convertible senior notes, net			$ 156,300
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	(159,275)	(153,791)		(148,163)	(132,003)	(116,853)	(123,616)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				16,802
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity			16,800
Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 1,116,872	$ 1,065,835		1,103,305	$ 1,065,543	$ 1,027,656	$ 905,821
Additional Paid-in Capital | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				$ (173,070)
Additional Paid-in Capital | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity			$ (173,100)

Marketable Securities - Summary

Marketable Securities - Summary of Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 1,180,010	$ 1,291,253
Unrealized Gain	468	1,435
Unrealized Losses	(318)	(156)
Fair Value	1,180,160	1,292,532
Commercial debt securities
Marketable Securities [Line Items]
Amortized Cost	917,016	926,836
Unrealized Gain	340	1,157
Unrealized Losses	(296)	(143)
Fair Value	917,060	927,850
Certificates of deposit
Marketable Securities [Line Items]
Amortized Cost	23,997	47,214
Unrealized Gain	21	43
Unrealized Losses	0	(1)
Fair Value	24,018	47,256
U.S. government treasury securities
Marketable Securities [Line Items]
Amortized Cost	67,792	108,092
Unrealized Gain	62	203
Unrealized Losses	(22)	(1)
Fair Value	67,832	108,294
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	171,205	209,111
Unrealized Gain	45	32
Unrealized Losses	0	(11)
Fair Value	$ 171,250	$ 209,132

Marketable Securities - Summa_2

Marketable Securities - Summary of Fair Values of Available-for-Sale Marketable Securities, by Remaining Contractual Maturity (Details) $ in Thousands	Sep. 30, 2021USD ($)
Investments, Debt and Equity Securities [Abstract]
Due within one year	$ 678,149
Due in one year through five years	502,011
Total	$ 1,180,160

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Marketable Securities:	$ 1,180,160	$ 1,292,532
Certificates of deposit
Financial Assets:
Marketable Securities:	24,018	47,256
Commercial paper
Financial Assets:
Marketable Securities:	171,250	209,132
Fair Value, Recurring
Financial Assets:
Total financial assets	1,441,232	1,499,470
Fair Value, Recurring | Money market funds
Financial Assets:
Cash equivalents:	259,957	181,743
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Cash equivalents:	1,115
Marketable Securities:	917,060	927,850
Fair Value, Recurring | Certificates of deposit
Financial Assets:
Marketable Securities:	24,018	47,256
Fair Value, Recurring | U.S. government treasury securities
Financial Assets:
Marketable Securities:	67,832	108,294
Fair Value, Recurring | Commercial paper
Financial Assets:
Cash equivalents:		25,195
Marketable Securities:	171,250	209,132
Fair Value, Recurring | Level 1
Financial Assets:
Total financial assets	259,957	181,743
Fair Value, Recurring | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	259,957	181,743
Fair Value, Recurring | Level 1 | Corporate debt securities
Financial Assets:
Cash equivalents:	0
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Certificates of deposit
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Commercial paper
Financial Assets:
Cash equivalents:		0
Marketable Securities:	0	0
Fair Value, Recurring | Level 2
Financial Assets:
Total financial assets	1,181,275	1,317,727
Fair Value, Recurring | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 2 | Corporate debt securities
Financial Assets:
Cash equivalents:	1,115
Marketable Securities:	917,060	927,850
Fair Value, Recurring | Level 2 | Certificates of deposit
Financial Assets:
Marketable Securities:	24,018	47,256
Fair Value, Recurring | Level 2 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	67,832	108,294
Fair Value, Recurring | Level 2 | Commercial paper
Financial Assets:
Cash equivalents:		25,195
Marketable Securities:	171,250	209,132
Fair Value, Recurring | Level 3
Financial Assets:
Total financial assets	0	0
Fair Value, Recurring | Level 3 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Financial Assets:
Cash equivalents:	0
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Certificates of deposit
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Commercial paper
Financial Assets:
Cash equivalents:		0
Marketable Securities:	$ 0	$ 0

Property and Equipment, Net - C

Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 118,068	$ 82,718
Less: accumulated depreciation and amortization	(49,248)	(35,521)
Total property and equipment, net	68,820	47,197
Computers and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	14,960	11,490
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	5,809	5,087
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	21,329	17,639
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 75,970	$ 48,502

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 4.7	$ 3.7	$ 13.1	$ 10.7

Acquisitions, Intangible Asse_3

Acquisitions, Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Feb. 28, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 255,735		$ 255,735			$ 17,609
Intangible amortization expense		$ 1,500	$ 300	$ 3,000	$ 700
Acquisition in April 2021
Business Acquisition [Line Items]
Consideration to acquire business	$ 219,400
Purchase price allocated to intangible assets	12,000
Goodwill	204,300
Severance charge	1,300
Acquisition in April 2021 | Developed technology
Business Acquisition [Line Items]
Purchase price allocated to intangible assets	$ 8,700
Acquired intangible assets, useful life	3 years
Acquisition in April 2021 | Customer relationships
Business Acquisition [Line Items]
Purchase price allocated to intangible assets	$ 3,300
Acquired intangible assets, useful life	4 years
Acquisition in February 2021
Business Acquisition [Line Items]
Purchase price allocated to intangible assets						$ 1,700
Goodwill						$ 34,300
2020 Acquisition
Business Acquisition [Line Items]
Purchase price allocated to intangible assets							1,500
Goodwill							$ 7,800

Acquisitions, Intangible Asse_4

Acquisitions, Intangible Assets and Goodwill - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,160
Accumulated Amortization	(3,357)
Net Carrying Amount	$ 12,803	$ 2,069
Amortization Period
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,860	3,331
Accumulated Amortization	(2,965)	(1,262)
Net Carrying Amount	$ 9,895	$ 2,069
Amortization Period	3 years	3 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,300
Accumulated Amortization	(392)
Net Carrying Amount	$ 2,908
Amortization Period	4 years

Acquisitions, Intangible Asse_5

Acquisitions, Intangible Assets and Goodwill - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquisitions, Intangible Assets And Goodwill [Abstract]
Remainder of 2021	$ 1,278
2022	5,066
2023	4,544
2024	1,688
2025	227
Net Carrying Amount	$ 12,803	$ 2,069

Acquisitions, Intangible Asse_6

Acquisitions, Intangible Assets and Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 17,609
Foreign currency translation adjustments	(476)
2021 acquisitions	238,602
Goodwill, ending balance	$ 255,735

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details) $ / shares in Units, shares in Millions	Jun. 02, 2020USD ($)d$ / shares	Sep. 30, 2021USD ($)$ / sharesshares	Jun. 30, 2021USD ($)	Jan. 01, 2021USD ($)	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Stockholders' equity		$ 957,412,000	$ 912,879,000		$ 957,432,000	$ 936,188,000	$ 912,871,000	$ 782,341,000
Convertible senior notes, net		734,643,000			575,864,000
Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity		(159,275,000)	(153,791,000)		(148,163,000)	(132,003,000)	(116,853,000)	(123,616,000)
Additional Paid-in Capital
Debt Instrument [Line Items]
Stockholders' equity		1,116,872,000	$ 1,065,835,000		1,103,305,000	$ 1,065,543,000	$ 1,027,656,000	$ 905,821,000
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Stockholders' equity					(156,268,000)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity					16,802,000
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital
Debt Instrument [Line Items]
Stockholders' equity					(173,070,000)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Convertible senior notes, net				$ 156,300,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity				16,800,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional Paid-in Capital
Debt Instrument [Line Items]
Stockholders' equity				$ (173,100,000)
0.125% Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Principal	$ 747,500,000	747,500,000			747,500,000
Debt instrument, interest rate	0.125%
Debt instrument, net proceeds from sale of notes	$ 730,200,000
Debt instrument, fair value calculation base		100
Debt instrument, convertible carrying amount of equity component	177,200,000
Debt issuance costs	17,300,000
Issuance cost attributable to liability component	$ 13,200,000
Debt instrument, effective interest rate	5.97%
Issuance cost attributable to equity component	$ 4,100,000
Convertible senior notes, net		734,643,000			$ 575,864,000
Debt instrument, estimated fair value (in dollars per share)		$ 1,237,100,000
Initial strike price per share of capped calls (in dollars per share) | $ / shares		$ 92.30
Initial cap price per share of capped calls | $ / shares		$ 151.04
Cost incurred to purchase capped calls		$ 89,600,000
0.125% Convertible Senior Notes due 2025 | Conversion Preceding March 15, 2025, Scenario One
Debt Instrument [Line Items]
Debt instrument, trading days | d	20
Debt instrument, consecutive trading days | d	30
Debt instrument, threshold percentage of conversion price	130.00%
0.125% Convertible Senior Notes due 2025 | Conversion Preceding March 15, 2025, Scenario Two
Debt Instrument [Line Items]
Debt instrument, consecutive trading days | d	10
Number of consecutive business days after any five consecutive trading day period during the note measurement period | d	5
Debt instrument, fair value calculation base	$ 1,000
Debt instrument, convertible, threshold maximum percentage of product of last reported sale price of common stock	98.00%
0.125% Convertible Senior Notes due 2025 | Conversion, On or After March 15, 2025
Debt Instrument [Line Items]
Debt instrument, fair value calculation base	$ 1,000
0.125% Convertible Senior Notes due 2025 | Redemption, On or After June 20, 2023, and Prior to 31st Scheduled Trading Day
Debt Instrument [Line Items]
Debt instrument redemption price percentage of principal amount redeemed	100.00%
0.125% Convertible Senior Notes due 2025 | Class A Common Stock
Debt Instrument [Line Items]
Debt instrument, consecutive trading days | d	30,000
Common stock covered under capped calls (in shares) | shares		8.1
0.125% Convertible Senior Notes due 2025 | Class A Common Stock | Conversion, On or After March 15, 2025
Debt Instrument [Line Items]
Debt instrument, fair value calculation base	$ 1,000
Debt instrument, conversion ratio	0.0108338
Debt instrument, conversion price per share (in dollars per share) | $ / shares	$ 92.30
0.125% Convertible Senior Notes due 2025 | Class A Common Stock | Redemption, On or After June 20, 2023, and Prior to 31st Scheduled Trading Day
Debt Instrument [Line Items]
Debt instrument, trading days | d	20
Debt instrument, consecutive trading days | d	30
0.125% Convertible Senior Notes due 2025 | Class A Common Stock | Minimum | Redemption, On or After June 20, 2023, and Prior to 31st Scheduled Trading Day
Debt Instrument [Line Items]
Debt instrument, threshold percentage of conversion price	130.00%

Convertible Senior Notes - Summ

Convertible Senior Notes - Summary of Net Carrying Amount of Liability Component of 2025 Notes (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Jun. 02, 2020
Debt Instrument [Line Items]
Net carrying amount	$ 734,643,000	$ 575,864,000
0.125% Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Principal	747,500,000	747,500,000	$ 747,500,000
Unamortized debt discount	0	(159,547,000)
Unamortized debt issuance costs	(12,857,000)	(12,089,000)
Net carrying amount	734,643,000	575,864,000
Equity Component	$ 0	$ 173,070,000

Convertible Senior Notes - Inte

Convertible Senior Notes - Interest Expense related to 2025 Notes (Details) - 0.125% Convertible Senior Notes due 2025 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 234	$ 234	$ 701	$ 306
Amortization of debt discount	0	7,589	0	9,929
Amortization of issuance costs	838	473	2,510	617
Total	$ 1,072	$ 8,296	$ 3,211	$ 10,852

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Matching contributions to the 401(k) plan	$ 0	$ 0	$ 0	$ 0

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)lease
Leases [Abstract]
Operating lease, renewal term (up to)	4 years
Operating lease, termination term (up to)	2 years
Number of operating lease not yet commenced | lease	1
Operating lease not yet commenced, undiscounted future payments | $	$ 4.2
Operating lease not yet commenced, term of contract	8 years 3 months 18 days

Leases - Summary of Components

Leases - Summary of Components of Lease Cost Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 5,245	$ 4,252	$ 14,765	$ 12,322
Short-term lease cost	1,075	867	2,528	2,763
Operating lease, non-cash lease expense	$ 4,500	$ 3,400	$ 12,600	$ 10,000

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information and Non-cash Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Cash paid for amounts included in measurement of lease liabilities	$ 14,878	$ 10,622
Operating lease assets obtained in exchange for new lease liabilities	$ 17,476	$ 11,581

Leases - Summary of Maturities

Leases - Summary of Maturities of Lease Liabilities (Details) $ in Thousands	Sep. 30, 2021USD ($)
Leases [Abstract]
Remainder of 2021	$ 5,063
2022	23,813
2023	20,928
2024	4,938
2025	5,203
2026 and beyond	21,638
Total lease payments	81,583
Less: imputed interest	(8,969)
Present value of lease liabilities	$ 72,614

Leases - Summary of Weighted Av

Leases - Summary of Weighted Average Remaining Lease Term and Discount Rate (Details)	Sep. 30, 2021
Leases [Abstract]
Weighted-average remaining lease term (years)	4 years 8 months 12 days
Weighted-average discount rate	4.68%

Revenue - Schedule of Revenue b

Revenue - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue by geographic area	$ 270,488	$ 154,675	$ 702,586	$ 425,935
North America
Disaggregation of Revenue [Line Items]
Revenue by geographic area	192,269	114,679	503,356	320,166
International
Disaggregation of Revenue [Line Items]
Revenue by geographic area	$ 78,219	$ 39,996	$ 199,230	$ 105,769

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized	$ 131.6	$ 73.3	$ 192.4	$ 121
Allowance for doubtful accounts receivable deemed uncollectible	1.2	0.9	1.2	0.9
Unbilled accounts receivable	$ 35.1		$ 35.1		$ 20.1
Deferred contract costs amortization period	4 years		4 years
Deferred contract costs	$ 55.4		$ 55.4		40.4
Amortization expense	4.7	$ 2.7	12.6	$ 7.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 718.6		$ 718.6		$ 434.1
Remaining performance obligations, expected to recognize period	24 months		24 months		24 months

Revenue - Schedule of Deferred

Revenue - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Movement In Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 40,388
Additions to deferred contract costs	27,610
Amortization of deferred contract costs	(12,557)	$ (7,348)
Ending balance	$ 55,441

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended		9 Months Ended		12 Months Ended	18 Months Ended
	Apr. 30, 2021shares	Feb. 28, 2021shares	Jun. 30, 2020shares	Nov. 30, 2019shares	Sep. 30, 2019	Sep. 30, 2021USD ($)classplan$ / sharesshares	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)voteclassplan$ / sharesshares	Sep. 30, 2020USD ($)$ / shares	Dec. 31, 2020USD ($)$ / sharesshares	Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock classes | class						2		2
Number of equity incentive plan | plan						2		2
Stock issuable upon the exercise of options outstanding (in shares)						22,325,949		22,325,949		27,068,323
Options granted (in shares)								0
Proceeds from exercise of stock options | $								$ 10,651	$ 12,354
Share-based payment arrangement, expense | $						$ 43,995	$ 20,716	107,371	49,610
Amounts withheld on behalf of employees for a future purchase | $								245	$ 977
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to unvested awards not yet recognized | $						$ 37,800		$ 37,800		$ 60,600
Weighted average period over compensation cost related to unvested employee awards								1 year 6 months		2 years
Options granted (in shares)								0
Weighted average grant-date fair value of options granted (in dollars per share) | $ / shares									$ 16.55
Proceeds from exercise of stock options | $								$ 10,700	$ 12,400
Intrinsic value of options exercised | $								434,100	443,400
Aggregate fair value of options vested | $								$ 21,500	$ 19,600
Early exercise of common stock (in shares)						63,000		63,000		438,750
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period over compensation cost related to unvested employee awards								3 years 1 month 6 days		3 years 4 months 24 days
Common stock granted								3,866,023
Total compensation cost related to unvested awards not yet recognized | $						$ 585,300		$ 585,300		$ 281,500
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expiration period					27 months
Percentage of purchase the shares at a price per share					85.00%
Share-based payment arrangement, expense | $						$ 2,100		5,700
Amounts withheld on behalf of employees for a future purchase | $								$ 8,700
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, number of votes per share | vote								1
Common stock, authorized (in shares)						2,000,000,000		2,000,000,000		2,000,000,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.00001		$ 0.00001		$ 0.00001
Common stock, issued (in shares)						255,875,718		255,875,718		218,510,509
Stock issuable upon the exercise of options outstanding (in shares)						33,421		33,421		34,759
Class A Common Stock | Service-based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock granted	245,761	117,538	96,210	244,445
Service based vesting period											4 years
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 (in shares)						55,390,029		55,390,029
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 (in shares)						12,142,034		12,142,034
Issuance of common stock under the Employee Stock Purchase Plan, net of shares withheld for taxes (in shares)								139,649
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, number of votes per share | vote								10
Common stock, number of shares converted						14,363,180		32,379,252
Common stock, authorized (in shares)						310,000,000		310,000,000		310,000,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.00001		$ 0.00001		$ 0.00001
Common stock, issued (in shares)						56,025,741		56,025,741		87,369,554
Stock issuable upon the exercise of options outstanding (in shares)						22,292,528		22,292,528		27,033,564

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Stock Option Activity and Weighted Average Exercise Prices (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares
Number Of Options Outstanding
Beginning balance (in shares) | shares	27,068,323
Options granted (in shares) | shares	0
Options exercised (in shares) | shares	(4,246,592)
Options forfeited or expired (in shares) | shares	(495,782)
Ending balance (in shares) | shares	22,325,949	27,068,323
Exercisable (in shares) | shares	16,428,418
Weighted- Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 3.31
Options granted (in dollars per share) | $ / shares	0
Options exercised (in dollars per share) | $ / shares	2.51
Options forfeited or expired (in dollars per share) | $ / shares	6.84
Ending balance (in dollars per share) | $ / shares	3.38	$ 3.31
Exercisable (in dollars per share) | $ / shares	$ 1.98
Weighted-average remaining contractual life (in years)	5 years 9 months 18 days	6 years 8 months 12 days
Exercisable (in years)	5 years 2 months 12 days
Aggregate intrinsic value | $	$ 3,080,305	$ 2,575,069
Exercisable intrinsic value | $	$ 2,289,558

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Activity for Unvested RSUs (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Shares
Beginning balance (in shares) | shares	5,166,720
Awarded (in shares) | shares	3,866,023
Vested (in shares) | shares	(1,133,572)
Forfeited/canceled (in shares) | shares	(668,835)
Ending balance (in shares) | shares	7,230,336
Weighted- Average Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 59.50
Awarded (in shares) | $ / shares	105.73
Vested (in shares) | $ / shares	50.59
Forfeited/cancelled (in dollars per share) | $ / shares	63.59
Ending balance (in dollars per share) | $ / shares	$ 85.23

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	$ 43,995	$ 20,716	$ 107,371	$ 49,610
Capitalized stock-based compensation expense	2,550	1,220	6,762	1,521
Total stock-based compensation expense	46,545	21,936	114,133	51,131
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	1,427	529	2,957	1,167
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	27,239	10,173	64,947	24,723
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	9,739	6,068	23,355	13,683
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	$ 5,590	$ 3,946	$ 16,112	$ 10,037

Interest Income and Other Inc_3

Interest Income and Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest and Other Income [Abstract]
Interest income	$ 4,830	$ 6,585	$ 15,970	$ 14,734
Other income, net	210	550	135	470
Interest income and other income, net	$ 5,040	$ 7,135	$ 16,105	$ 15,204

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective tax rate	(15.04%)	(4.09%)	(3.56%)	(18.88%)

Net Loss Per Share - Schedule o

Net Loss Per Share - Schedule of Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic net loss per share:
Net loss	$ (5,484)	$ (15,150)	$ (27,914)	$ (8,387)
Weighted-average shares used in calculating net income (loss) per share, basic (in shares)	310,247	302,554	308,115	299,105
Basic net income (loss) per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Diluted net loss per share:
Net loss attributable to common stockholders	$ (5,484)	$ (15,150)	$ (27,914)	$ (8,387)
Number of shares used in basic calculation (in shares)	310,247	302,554	308,115	299,105
Weighted-average effect of diluted securities:
Number of shares used in diluted calculation (in shares)	310,247	302,554	308,115	299,105
Diluted net income (loss) per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Class A Common Stock
Basic net loss per share:
Net loss	$ (4,338)	$ (9,773)	$ (21,287)	$ (4,257)
Weighted-average shares used in calculating net income (loss) per share, basic (in shares)	245,431	195,176	234,969	151,806
Basic net income (loss) per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Diluted net loss per share:
Net loss attributable to common stockholders	$ (4,338)	$ (9,773)	$ (21,287)	$ (4,257)
Reallocation of undistributed net loss as a result of conversion of Class B to Class A shares	(1,146)	(5,377)	(6,627)	(4,130)
Allocation of undistributed loss	$ (5,484)	$ (15,150)	$ (27,914)	$ (8,387)
Number of shares used in basic calculation (in shares)	245,431	195,176	234,969	151,806
Weighted-average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding (in shares)	64,816	107,378	73,146	147,299
Number of shares used in diluted calculation (in shares)	310,247	302,554	308,115	299,105
Diluted net income (loss) per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Class B Common Stock
Basic net loss per share:
Net loss	$ (1,146)	$ (5,377)	$ (6,627)	$ (4,130)
Weighted-average shares used in calculating net income (loss) per share, basic (in shares)	64,816	107,378	73,146	147,299
Basic net income (loss) per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)
Diluted net loss per share:
Net loss attributable to common stockholders	$ (1,146)	$ (5,377)	$ (6,627)	$ (4,130)
Reallocation of undistributed net loss as a result of conversion of Class B to Class A shares	0	0		0
Allocation of undistributed loss	$ (1,146)	$ (5,377)	$ (6,627)	$ (4,130)
Number of shares used in basic calculation (in shares)	64,816	107,378	73,146	147,299
Weighted-average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding (in shares)	0	0	0	0
Number of shares used in diluted calculation (in shares)	64,816	107,378	73,146	147,299
Diluted net income (loss) per share (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.09)	$ (0.03)

Net Loss Per Share - Schedule_2

Net Loss Per Share - Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	38,726	34,022
Shares subject to outstanding stock options and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	29,556	32,972
Unvested early exercised stock options and restricted shares of common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	903	919
Shares subject to the employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	169	131
Shares issuable upon conversion of the convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	8,098	0