Datadog (DDOG) 10-Q 7 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 28, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 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	Q1
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)		233,936,813
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		74,446,636

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 369,706	$ 224,927
Marketable securities	1,178,190	1,292,532
Accounts receivable, net of allowance for credit losses of $2,317 and $2,468 as of March 31, 2021 and December 31, 2020, respectively	154,111	163,359
Deferred contract costs, current	15,446	13,638
Prepaid expenses and other current assets	29,404	23,624
Total current assets	1,746,857	1,718,080
Property and equipment, net	52,805	47,197
Operating lease assets	53,117	57,829
Goodwill	48,479	17,609
Intangible assets, net	3,414	2,069
Deferred contract costs, non-current	27,874	26,750
Restricted cash	3,613	3,784
Other assets	15,915	16,967
TOTAL ASSETS	1,952,074	1,890,285
CURRENT LIABILITIES:
Accounts payable	12,065	21,342
Accrued expenses and other current liabilities	68,476	55,351
Operating lease liabilities, current	16,626	16,326
Deferred revenue, current	223,647	204,825
Total current liabilities	320,814	297,844
Operating lease liabilities, non-current	46,620	51,433
Convertible senior notes, net	732,968	575,864
Deferred revenue, non-current	5,628	3,450
Other liabilities	4,714	4,262
Total liabilities	1,110,744	932,853
COMMITMENTS AND CONTINGENCIES (NOTE 8)
STOCKHOLDERS' EQUITY:
Additional paid-in capital	985,004	1,103,305
Accumulated other comprehensive income	752	2,287
Accumulated deficit	(144,429)	(148,163)
Total stockholders’ equity	841,330	957,432
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,952,074	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	Mar. 31, 2021	Dec. 31, 2020
Accounts receivable, net of allowance for doubtful accounts	$ 2,317	$ 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)	232,419,196	218,510,509
Common stock, outstanding (in shares)	232,419,196	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)	75,385,154	87,369,554
Common stock, outstanding (in shares)	75,385,154	87,369,554

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 198,549	$ 131,248
Cost of revenue	46,666	26,479
Gross profit	151,883	104,769
Operating expenses:
Research and development	79,266	40,824
Sales and marketing	64,353	45,215
General and administrative	21,094	14,952
Total operating expenses	164,713	100,991
Operating (loss) income	(12,830)	3,778
Other income:
Interest expense	(5,472)	(707)
Interest income and other income, net	5,773	3,603
Other income, net	301	2,896
(Loss) income before provision for income taxes	(12,529)	6,674
Provision for income taxes	(539)	(195)
Net (loss) income	(13,068)	6,479
Net (loss) income attributable to common stockholders	$ (13,068)	$ 6,479
Basic net (loss) income per share (in dollars per share)	$ (0.04)	$ 0.02
Diluted net (loss) income per share (in dollars per share)	$ (0.04)	$ 0.02
Weighted average shares used in calculating basic net income (loss) per share (in shares)	306,034	295,455
Weighted average shares used in calculating diluted net income (loss) per share (in shares)	306,034	327,801

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (13,068)	$ 6,479
Other comprehensive loss:
Foreign currency translation adjustments	(853)	(287)
Unrealized loss on available-for-sale marketable securities	(682)	(908)
Other comprehensive loss:	(1,535)	(1,195)
Comprehensive (loss) income	$ (14,603)	$ 5,284

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)				2,347,770
Issuance of common stock upon exercise of stock options	2,813					2,813
Vesting of early exercised stock options	294					294
Stock-based compensation	12,163					12,163
Change in accumulated other comprehensive income (loss)	(1,195)								(1,195)
Net (loss) income	6,479										6,479
Ending balance, shares at Mar. 31, 2020				298,734,720
Ending balance at Mar. 31, 2020	802,895			$ 3		921,091			(1,062)		(117,137)
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 List]	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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,320,113			1,320,113
Issuance of common stock upon exercise of stock options	$ 3,290					3,290
Vesting of early exercised stock options	293					293
Vesting of restricted stock units, shares				348,352
Issuance of restricted shares of common stock from acquisition (in shares)				255,822
Issuance of restricted shares of common stock from acquisition	20,172					20,172
Stock-based compensation	31,014					31,014
Change in accumulated other comprehensive income (loss)	(1,535)								(1,535)
Net (loss) income	(13,068)										(13,068)
Ending balance, shares at Mar. 31, 2021				307,804,350
Ending balance at Mar. 31, 2021	$ 841,330			$ 3		$ 985,004			$ 752		$ (144,429)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (13,068)	$ 6,479
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	4,402	3,688
Amortization of discounts or premiums on marketable securities	4,259	244
Amortization of issuance costs	835	0
Amortization of deferred contract costs	3,779	2,185
Stock-based compensation, net of amounts capitalized	28,861	12,060
Non-cash lease expense	4,012	3,226
Allowance for credit losses on accounts receivable	25	1,073
Loss on disposal of property and equipment	3	2
Changes in operating assets and liabilities:
Accounts receivable, net	9,223	(7,116)
Deferred contract costs	(6,711)	(4,619)
Prepaid expenses and other current assets	(5,998)	(1,404)
Other assets	572	919
Accounts payable	(9,226)	(1,391)
Accrued expenses and other liabilities	9,682	2,025
Deferred revenue	21,000	6,884
Net cash provided by operating activities	51,650	24,255
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(150,331)	(427,482)
Maturities of marketable securities	253,234	2,620
Proceeds from sale of marketable securities	6,497	0
Purchases of property and equipment	(998)	(1,526)
Capitalized software development costs	(6,183)	(3,417)
Cash paid for acquisition of businesses; net of cash acquired	(11,509)	0
Net cash provided by (used in) investing activities	90,710	(429,805)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	3,275	2,813
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering cost	0	(153)
Employee payroll taxes paid related to net share settlement under the employee stock purchase plan	(245)	0
Net cash provided by financing activities	3,030	2,660
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(782)	(141)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	144,608	(403,031)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	228,711	601,189
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—End of period	373,319	198,158
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	327	34
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued property and equipment purchases	213	610
Stock-based compensation included in capitalized software development costs	2,153	103
Vesting of early exercised options	293	294
Costs related to initial public offering included in accounts payable and accrued liabilities	0	268
Issuance of restricted shares of common stock for the acquisition of businesses	20,172	0
Acquisition holdback	1,195	0
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:
Total cash, cash equivalents and restricted cash	$ 373,319	$ 198,158

Organization and Description of

Organization and Description of Business	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 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 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 convertible instruments with a

Marketable Securities

Marketable Securities	3 Months Ended
	Mar. 31, 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 March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Amortized Unrealized Unrealized Fair Commercial debt securities $ 855,305 $ 644 $ (260) $ 855,689 Certificates of deposit 47,652 43 — 47,695 U.S. government treasury securities 83,839 117 — 83,956 Commercial paper 190,797 55 (2) 190,850 Marketable securities $ 1,177,593 $ 859 $ (262) $ 1,178,190 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 March 31, 2021, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands): Due within one year $ 909,906 Due in one year through five years 268,284 Total $ 1,178,190 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 gain and losses on marketable securities are presented net of tax.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 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 March 31, 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 March 31, 2021 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 358,369 $ — $ — $ 358,369 Corporate debt securities — 3,785 — 3,785 Marketable Securities: Corporate debt securities — 855,689 — 855,689 Certificates of deposit — 47,695 — 47,695 U.S. government treasury securities — 83,956 — 83,956 Commercial paper — 190,850 — 190,850 Total financial assets $ 358,369 $ 1,181,975 $ — $ 1,540,344 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	3 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Property and Equipment, Net Property and equipment, net consisted of the following (in thousands): March 31, December 31, Computers and equipment $ 12,307 $ 11,490 Furniture and fixtures 4,985 5,087 Leasehold improvements 17,420 17,639 Capitalized software development costs 57,649 48,502 Total property and equipment $ 92,361 $ 82,718 Less: accumulated depreciation and amortization (39,556) (35,521) Total property and equipment, net $ 52,805 $ 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.

Acquisition, Intangible Assets

Acquisition, Intangible Assets and Goodwill	3 Months Ended
	Mar. 31, 2021
Acquisition, Intangible Assets And Goodwill [Abstract]
Acquisition, Intangible Assets and Goodwill	Acquisition, Intangible Assets and Goodwill 2021 Acquisition During the three months ended March 31, 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 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 $1.7 million and goodwill in the amount of $31.3 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): March 31, 2021 Gross Accumulated Net Amortization Developed technology $ 5,031 $ (1,617) $ 3,414 3 years December 31, 2020 Gross Accumulated Net Amortization Developed technology $ 3,331 $ (1,262) $ 2,069 3 years Intangible amortization expense was approximately $0.4 million and $0.2 million for the three months ended March 31, 2021 and 2020, respectively. Amortization of developed technology is included in cost of revenue on the Company’s condensed consolidated statement of operations. As of March 31, 2021, future amortization expense by year is expected to be as follows (in thousands): Amount Remainder of 2021 $ 1,188 2022 1,341 2023 819 2024 66 Total $ 3,414 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 (384) 2021 acquisition 31,254 Balance as of March 31, 2021 $ 48,479
Acquisition, Intangible Assets and Goodwill	Acquisition, Intangible Assets and Goodwill 2021 Acquisition During the three months ended March 31, 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 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 $1.7 million and goodwill in the amount of $31.3 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): March 31, 2021 Gross Accumulated Net Amortization Developed technology $ 5,031 $ (1,617) $ 3,414 3 years December 31, 2020 Gross Accumulated Net Amortization Developed technology $ 3,331 $ (1,262) $ 2,069 3 years Intangible amortization expense was approximately $0.4 million and $0.2 million for the three months ended March 31, 2021 and 2020, respectively. Amortization of developed technology is included in cost of revenue on the Company’s condensed consolidated statement of operations. As of March 31, 2021, future amortization expense by year is expected to be as follows (in thousands): Amount Remainder of 2021 $ 1,188 2022 1,341 2023 819 2024 66 Total $ 3,414 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 (384) 2021 acquisition 31,254 Balance as of March 31, 2021 $ 48,479

Convertible Senior Notes

Convertible Senior Notes	3 Months Ended
	Mar. 31, 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 March 31, 2021, the conditions allowing holders of the 2025 Notes to convert have not been met. The 2025 Notes were therefore not convertible during the three months ended March 31, 2021 and were classified as long-term debt on the Company’s condensed consolidated balance sheets. 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. 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 will no longer be presented in equity. Similarly, the debt discount, that is equal to the carrying value of the embedded conversion feature upon issuance, will no longer be 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 consolidated balance sheet. The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): March 31, Principal $ 747,500 Unamortized debt issuance costs (14,532) Net carrying amount $ 732,968 As of March 31, 2021, the total estimated fair value of the 2025 Notes was approximately $881.0 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 months ended March 31, 2021 (in thousands): Three Months Ended March 31, 2021 Contractual interest expense $ 234 Amortization of issuance costs 835 Total $ 1,069 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	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Non-cancelable Material Commitments —During the three months ended March 31, 2021, other than certain non-cancelable operating lease described in Note 9, Leases , there have been no 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 US employees. Contributions to the 401(k) plan are discretionary. The Company did not make any matching contributions to the 401(k) plan for the three months ended March 31, 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	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	Leases The Company has entered into various non-cancelable operating leases for its facilities expiring between 2021 and 2031. Certain lease agreements contain an option for the Company to renew a lease for a term of up to five years or an option to terminate a lease early within three 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 2021 2020 Operating lease cost (1) $ 4,755 $ 3,960 Short-term lease cost 792 899 1) Includes non-cash lease expense of $4.0 million and $3.2 million for the three months ended March 31, 2021 and 2020, respectively. Supplemental cash flow information and non-cash activity related to the Company’s operating leases are as follows (in thousands): Three Months Ended 2021 2020 Cash paid for amounts included in measurement of lease liabilities $ 4,483 $ 3,134 Operating lease assets obtained in exchange for new lease liabilities — 1,862 Maturities of lease liabilities by fiscal year for the Company’s operating leases are as follows (in thousands): Amount Remainder of 2021 $ 14,349 2022 20,023 2023 17,898 2024 2,572 2025 2,766 2026 and beyond 12,746 Total lease payments $ 70,354 Less: imputed interest (7,108) Present value of lease liabilities $ 63,246 As of March 31, 2021, the Company had one additional operating lease that had not yet commenced, which is excluded from the table above. The operating lease will commence in fiscal year 2021 and has $19.0 million of undiscounted future payments with a lease term of 7.8 years. The Company also signed an operating lease in April 2021 that will commence in fiscal year 2021 and has $4.2 million of undiscounted future payments 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: March 31, Weighted-average remaining lease term (years) 4.3 Weighted-average discount rate 4.71 %

Revenue

Revenue	3 Months Ended
	Mar. 31, 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 2021 2020 North America $ 142,890 $ 99,382 International 55,659 31,866 Total $ 198,549 $ 131,248 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 March 31, 2021 and 2020, which was included in the deferred revenue balances at the beginning of each such period, was $96.4 million and $68.1 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 March 31, 2021 and December 31, 2020, the aggregate transaction price allocated to remaining performance obligations was $464.3 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 three months ended March 31, 2021 and 2020, the Company charged $0.2 million and $0.2 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 March 31, 2021 and December 31, 2020, unbilled accounts receivable of approximately $25.6 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 $43.3 million and $40.4 million as of March 31, 2021 and December 31, 2020, respectively. Amortization expense was $3.8 million and $2.2 million for the three months ended March 31, 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 6,711 Amortization of deferred contract costs (3,779) Balance as of March 31, 2021 $ 43,320

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 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 upon the sale or transfer to Class A common stock, subject to certain limited exceptions. During the three months ended March 31, 2021, 13,014,453 shares of Class B common stock were converted into Class A common stock. As of March 31, 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 232,419,196 shares of Class A common stock and 75,385,154 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 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 (“SARs”), restricted stock awards (“RSAs”), restricted stock units (“RSUs”), and performance-based and other awards, each valued or based on the Company’s Class A common stock, to employees, consultants, and advisors of the Company. As of March 31, 2021, there were 57,863,748 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 (1,320,113) 2.49 Options forfeited or expired (96,151) 4.86 Balance outstanding—March 31, 2021 25,652,059 $ 3.34 6.4 $ 2,052,059 Exercisable—March 31, 2021 16,917,990 1.58 5.7 As of March 31, 2021, there were 34,351 shares of Class A common stock and 25,617,708 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 awards not yet recognized was approximately $53.5 million and $60.6 million as of March 31, 2021 and December 31, 2020, respectively. The weighted-average period over which this compensation cost related to unvested employee awards will be recognized is 1.9 years and 2.0 years as of March 31, 2021 and December 31, 2020, respectively. There were no options granted during the three months ended March 31, 2021. The weighted-average grant-date fair value of options granted during the three months ended March 31, 2020 was $16.55. The Company received approximately $3.3 million and $2.8 million in cash proceeds from options exercised during the three months ended March 31, 2021 and 2020, respectively. The intrinsic value of options exercised during the three months ended March 31, 2021 and 2020 was approximately $123.6 million and $86.5 million, respectively. The aggregate fair value of options vested during the three months ended March 31, 2021 and 2020 was $7.4 million and $3.8 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 238,500 shares of common stock and 438,750 shares of common stock as of March 31, 2021 and December 31, 2020, respectively. Restricted Stock Units The following table summarizes the activity for the Company’s unvested RSUs: Shares Weighted- Balance—December 31, 2020 5,166,720 $ 59.50 Awarded 387,107 92.15 Vested (348,352) 40.82 Forfeited/canceled (63,269) 50.91 Unvested and outstanding—March 31, 2021 5,142,206 $ 63.33 The Company granted 244,445, 96,210 and 117,538 restricted shares of Class A common stock in November 2019, June 2020 and February 2021, respectively, 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 $298.1 million and $281.5 million as of March 31, 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 3.2 years and 3.4 years as of March 31, 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 Company’s IPO (the “Final Prospectus”). As of March 31, 2021, 12,281,683 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 $1.6 million of stock-based compensation expense related to the ESPP during the three months ended March 31, 2021. As of March 31, 2021, $7.8 million has been withheld on behalf of employees for a future purchase under the ESPP due to the timing of payroll deductions. There were no purchases related to the ESPP in the three months ended March 31, 2021 and 2020. 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 2021 2020 Cost of revenue $ 701 $ 231 Research and development 16,069 5,847 Sales and marketing 7,010 3,074 General and administrative 5,081 2,908 Stock-based compensation, net of amounts capitalized 28,861 12,060 Capitalized stock-based compensation expense 2,153 103 Total stock-based compensation expense $ 31,014 $ 12,163

Interest Income and Other Incom

Interest Income and Other Income, Net	3 Months Ended
	Mar. 31, 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 2021 2020 Interest income $ 5,898 $ 3,778 Other expense, net (125) (175) Interest income and other income, net $ 5,773 $ 3,603

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company has an effective tax rate of (4.3)% and 2.9% for the three months ended March 31, 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 three months ended March 31, 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 months ended March 31, 2021. On March 11, 2021, the American Rescue Plan was enacted, which extends the period companies can claim an Employee Retention Credit, extends the IRC Section 162(m) limit on deductions for publicly traded companies, and repeals the election that allows US affiliate groups to allocate interest expense on a worldwide basis, among other provisions. The Company reviewed the provisions of the new law and determined it has no material impact for the three months ended March 31, 2021.

Net (Loss) Income Per Share

Net (Loss) Income Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Net (Loss) Income Per Share	Net (Loss) Income Per Share Basic and diluted net (loss) income 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 equity in the Company. Basic and diluted net (loss) income 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) income per share of Class A common stock, the undistributed earnings are equal to net (loss) income for that computation. The following table presents the calculation of basic and diluted net (loss) income per share (in thousands, except per share data): Three Months Ended 2021 2020 Basic net (loss) income per share: Class A Class B Class A Class B Numerator: Net (loss) income $ (9,547) $ (3,521) $ 1,852 $ 4,627 Denominator: Weighted-average shares used in calculating net (loss) income per share, basic 223,566 82,468 84,434 211,021 Basic net (loss) income per share $ (0.04) $ (0.04) $ 0.02 $ 0.02 Diluted net (loss) income per share: Numerator: Allocation of distributed (loss) income for basic computation $ (9,547) $ (3,521) $ 1,852 $ 4,627 Reallocation of undistributed (loss) income as a result of conversion of Class B to Class A shares (3,521) — 4,627 — Allocation of undistributed (loss) income $ (13,068) $ (3,521) $ 6,479 $ 4,627 Denominator: Number of shares used in basic calculation 223,566 82,468 84,434 211,021 Weighted-average effect of diluted securities: Conversion of Class B to Class A common shares outstanding 82,468 — 211,021 — Employee stock options — — 30,708 — Employee stock purchase plan — — 129 — Unvested early exercises — — 1,139 — Restricted Stock Units — — 126 — Unvested restricted stock in connection with acquisition — — 244 — Number of shares used in diluted calculation 306,034 82,468 327,801 211,021 Diluted net (loss) income per share $ (0.04) $ (0.04) $ 0.02 $ 0.02 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 March 31, 2021 2020 Shares subject to outstanding stock options and restricted stock units 30,794 4,352 Unvested early exercised stock options and restricted stock 620 — Shares subject to the employee stock purchase plan 138 217 Shares issuable upon conversion of the convertible senior notes 8,098 — Total 39,650 4,569 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. Although the Notes were not convertible as of March 31, 2021, the Company calculated the potentially dilutive effect of the share conversion which is included in the table above. 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.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsIn April 2021, the Company completed the acquisition of Sqreen, Inc, a SaaS based security platform, for approximately $260 million in cash and stock, subject to certain customary adjustments, of which approximately 25% is deferred. The Company is currently evaluating the purchase price allocation for this transaction.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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 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 convertible instruments with a

Marketable Securities (Tables)

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2021 and December 31, 2020 (in thousands): March 31, 2021 Amortized Unrealized Unrealized Fair Commercial debt securities $ 855,305 $ 644 $ (260) $ 855,689 Certificates of deposit 47,652 43 — 47,695 U.S. government treasury securities 83,839 117 — 83,956 Commercial paper 190,797 55 (2) 190,850 Marketable securities $ 1,177,593 $ 859 $ (262) $ 1,178,190 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 March 31, 2021, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands): Due within one year $ 909,906 Due in one year through five years 268,284 Total $ 1,178,190

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 March 31, 2021 Level 1 Level 2 Level 3 Total Financial Assets: Cash equivalents: Money market funds $ 358,369 $ — $ — $ 358,369 Corporate debt securities — 3,785 — 3,785 Marketable Securities: Corporate debt securities — 855,689 — 855,689 Certificates of deposit — 47,695 — 47,695 U.S. government treasury securities — 83,956 — 83,956 Commercial paper — 190,850 — 190,850 Total financial assets $ 358,369 $ 1,181,975 $ — $ 1,540,344 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)	3 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): March 31, December 31, Computers and equipment $ 12,307 $ 11,490 Furniture and fixtures 4,985 5,087 Leasehold improvements 17,420 17,639 Capitalized software development costs 57,649 48,502 Total property and equipment $ 92,361 $ 82,718 Less: accumulated depreciation and amortization (39,556) (35,521) Total property and equipment, net $ 52,805 $ 47,197

Acquisition, Intangible Asset_2

Acquisition, Intangible Assets and Goodwill (Tables)	3 Months Ended
	Mar. 31, 2021
Acquisition, Intangible Assets And Goodwill [Abstract]
Schedule of Intangible Assets, Net	Intangible assets, net consisted of the following (in thousands): March 31, 2021 Gross Accumulated Net Amortization Developed technology $ 5,031 $ (1,617) $ 3,414 3 years December 31, 2020 Gross Accumulated Net Amortization Developed technology $ 3,331 $ (1,262) $ 2,069 3 years
Schedule of Future Amortization Expense	As of March 31, 2021, future amortization expense by year is expected to be as follows (in thousands): Amount Remainder of 2021 $ 1,188 2022 1,341 2023 819 2024 66 Total $ 3,414
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 (384) 2021 acquisition 31,254 Balance as of March 31, 2021 $ 48,479

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	3 Months Ended
	Mar. 31, 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): March 31, Principal $ 747,500 Unamortized debt issuance costs (14,532) Net carrying amount $ 732,968
Interest Expense related to 2025 Notes	The following table sets forth the interest expense related to the 2025 Notes for the three months ended March 31, 2021 (in thousands): Three Months Ended March 31, 2021 Contractual interest expense $ 234 Amortization of issuance costs 835 Total $ 1,069

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 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 2021 2020 Operating lease cost (1) $ 4,755 $ 3,960 Short-term lease cost 792 899 1) Includes non-cash lease expense of $4.0 million and $3.2 million for the three months ended March 31, 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): Three Months Ended 2021 2020 Cash paid for amounts included in measurement of lease liabilities $ 4,483 $ 3,134 Operating lease assets obtained in exchange for new lease liabilities — 1,862
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 $ 14,349 2022 20,023 2023 17,898 2024 2,572 2025 2,766 2026 and beyond 12,746 Total lease payments $ 70,354 Less: imputed interest (7,108) Present value of lease liabilities $ 63,246
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: March 31, Weighted-average remaining lease term (years) 4.3 Weighted-average discount rate 4.71 %

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 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 2021 2020 North America $ 142,890 $ 99,382 International 55,659 31,866 Total $ 198,549 $ 131,248
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 6,711 Amortization of deferred contract costs (3,779) Balance as of March 31, 2021 $ 43,320

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 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 (1,320,113) 2.49 Options forfeited or expired (96,151) 4.86 Balance outstanding—March 31, 2021 25,652,059 $ 3.34 6.4 $ 2,052,059 Exercisable—March 31, 2021 16,917,990 1.58 5.7
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 387,107 92.15 Vested (348,352) 40.82 Forfeited/canceled (63,269) 50.91 Unvested and outstanding—March 31, 2021 5,142,206 $ 63.33
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 2021 2020 Cost of revenue $ 701 $ 231 Research and development 16,069 5,847 Sales and marketing 7,010 3,074 General and administrative 5,081 2,908 Stock-based compensation, net of amounts capitalized 28,861 12,060 Capitalized stock-based compensation expense 2,153 103 Total stock-based compensation expense $ 31,014 $ 12,163

Interest Income and Other Inc_2

Interest Income and Other Income, Net (Tables)	3 Months Ended
	Mar. 31, 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 2021 2020 Interest income $ 5,898 $ 3,778 Other expense, net (125) (175) Interest income and other income, net $ 5,773 $ 3,603

Net (Loss) Income Per Share (Ta

Net (Loss) Income Per Share (Tables)	3 Months Ended
	Mar. 31, 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) income per share (in thousands, except per share data): Three Months Ended 2021 2020 Basic net (loss) income per share: Class A Class B Class A Class B Numerator: Net (loss) income $ (9,547) $ (3,521) $ 1,852 $ 4,627 Denominator: Weighted-average shares used in calculating net (loss) income per share, basic 223,566 82,468 84,434 211,021 Basic net (loss) income per share $ (0.04) $ (0.04) $ 0.02 $ 0.02 Diluted net (loss) income per share: Numerator: Allocation of distributed (loss) income for basic computation $ (9,547) $ (3,521) $ 1,852 $ 4,627 Reallocation of undistributed (loss) income as a result of conversion of Class B to Class A shares (3,521) — 4,627 — Allocation of undistributed (loss) income $ (13,068) $ (3,521) $ 6,479 $ 4,627 Denominator: Number of shares used in basic calculation 223,566 82,468 84,434 211,021 Weighted-average effect of diluted securities: Conversion of Class B to Class A common shares outstanding 82,468 — 211,021 — Employee stock options — — 30,708 — Employee stock purchase plan — — 129 — Unvested early exercises — — 1,139 — Restricted Stock Units — — 126 — Unvested restricted stock in connection with acquisition — — 244 — Number of shares used in diluted calculation 306,034 82,468 327,801 211,021 Diluted net (loss) income per share $ (0.04) $ (0.04) $ 0.02 $ 0.02
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 March 31, 2021 2020 Shares subject to outstanding stock options and restricted stock units 30,794 4,352 Unvested early exercised stock options and restricted stock 620 — Shares subject to the employee stock purchase plan 138 217 Shares issuable upon conversion of the convertible senior notes 8,098 — Total 39,650 4,569

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 841,330		$ 957,432	$ 802,895	$ 782,341
Convertible senior notes, net	732,968		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	(144,429)		(148,163)	(117,137)	(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	$ 985,004		1,103,305	$ 921,091	$ 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	Mar. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 1,177,593	$ 1,291,253
Unrealized Gain	859	1,435
Unrealized Losses	(262)	(156)
Fair Value	1,178,190	1,292,532
Commercial debt securities
Marketable Securities [Line Items]
Amortized Cost	855,305	926,836
Unrealized Gain	644	1,157
Unrealized Losses	(260)	(143)
Fair Value	855,689	927,850
Certificates of deposit
Marketable Securities [Line Items]
Amortized Cost	47,652	47,214
Unrealized Gain	43	43
Unrealized Losses	0	(1)
Fair Value	47,695	47,256
U.S. government treasury securities
Marketable Securities [Line Items]
Amortized Cost	83,839	108,092
Unrealized Gain	117	203
Unrealized Losses	0	(1)
Fair Value	83,956	108,294
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	190,797	209,111
Unrealized Gain	55	32
Unrealized Losses	(2)	(11)
Fair Value	$ 190,850	$ 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	Mar. 31, 2021USD ($)
Investments, Debt and Equity Securities [Abstract]
Due within one year	$ 909,906
Due in one year through five years	268,284
Total	$ 1,178,190

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Assets:
Marketable Securities:	$ 1,178,190	$ 1,292,532
Commercial paper
Financial Assets:
Marketable Securities:	190,850	209,132
Certificates of deposit
Financial Assets:
Marketable Securities:	47,695	47,256
Fair Value, Recurring
Financial Assets:
Total financial assets	1,540,344	1,499,470
Fair Value, Recurring | Money market funds
Financial Assets:
Cash equivalents:	358,369	181,743
Fair Value, Recurring | Commercial paper
Financial Assets:
Cash equivalents:		25,195
Marketable Securities:	190,850	209,132
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Cash equivalents:	3,785
Marketable Securities:	855,689	927,850
Fair Value, Recurring | Certificates of deposit
Financial Assets:
Marketable Securities:	47,695	47,256
Fair Value, Recurring | U.S. government treasury securities
Financial Assets:
Marketable Securities:	83,956	108,294
Fair Value, Recurring | Level 1
Financial Assets:
Total financial assets	358,369	181,743
Fair Value, Recurring | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	358,369	181,743
Fair Value, Recurring | Level 1 | Commercial paper
Financial Assets:
Cash equivalents:		0
Marketable Securities:	0	0
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 2
Financial Assets:
Total financial assets	1,181,975	1,317,727
Fair Value, Recurring | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 2 | Commercial paper
Financial Assets:
Cash equivalents:		25,195
Marketable Securities:	190,850	209,132
Fair Value, Recurring | Level 2 | Corporate debt securities
Financial Assets:
Cash equivalents:	3,785
Marketable Securities:	855,689	927,850
Fair Value, Recurring | Level 2 | Certificates of deposit
Financial Assets:
Marketable Securities:	47,695	47,256
Fair Value, Recurring | Level 2 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	83,956	108,294
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 | Commercial paper
Financial Assets:
Cash equivalents:		0
Marketable Securities:	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

Property and Equipment, Net - C

Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 92,361	$ 82,718
Less: accumulated depreciation and amortization	(39,556)	(35,521)
Total property and equipment, net	52,805	47,197
Computers and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	12,307	11,490
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	4,985	5,087
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	17,420	17,639
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 57,649	$ 48,502

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 4	$ 3.5

Acquisition, Intangible Asset_3

Acquisition, Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 48,479		$ 17,609
Intangible amortization expense	400	$ 200
2021 Acquisition
Business Acquisition [Line Items]
Purchase price was allocated to intangible assets	1,700
Goodwill	$ 31,300
2020 Acquisition
Business Acquisition [Line Items]
Purchase price was allocated to intangible assets			1,500
Goodwill			$ 7,800

Acquisition, Intangible Asset_4

Acquisition, Intangible Assets and Goodwill - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 3,414	$ 2,069
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,031	3,331
Accumulated Amortization	(1,617)	(1,262)
Net Carrying Amount	$ 3,414	$ 2,069
Amortization Period	3 years	3 years

Acquisition, Intangible Asset_5

Acquisition, Intangible Assets and Goodwill - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Acquisition, Intangible Assets And Goodwill [Abstract]
Remainder of 2021	$ 1,188
2022	1,341
2023	819
2024	66
Net Carrying Amount	$ 3,414	$ 2,069

Acquisition, Intangible Asset_6

Acquisition, Intangible Assets and Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 17,609
Foreign currency translation adjustments	(384)
2021 acquisition	31,254
Goodwill, ending balance	$ 48,479

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details) $ / shares in Units, shares in Millions	Jun. 02, 2020USD ($)d$ / shares	Mar. 31, 2021USD ($)$ / sharesshares	Jan. 01, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Stockholders' equity		$ 841,330,000		$ 957,432,000	$ 802,895,000	$ 782,341,000
Convertible senior notes, net		732,968,000		575,864,000
Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity		(144,429,000)		(148,163,000)	(117,137,000)	(123,616,000)
Additional Paid-in Capital
Debt Instrument [Line Items]
Stockholders' equity		985,004,000		1,103,305,000	$ 921,091,000	$ 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
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		732,968,000
Debt instrument, estimated fair value (in dollars per share)		$ 881,000,000
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]
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, 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 ($)	Mar. 31, 2021	Dec. 31, 2020	Jun. 02, 2020
Debt Instrument [Line Items]
Net carrying amount	$ 732,968,000	$ 575,864,000
0.125% Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Principal	747,500,000		$ 747,500,000
Unamortized debt issuance costs	(14,532,000)
Net carrying amount	$ 732,968,000

Convertible Senior Notes - Inte

Convertible Senior Notes - Interest Expense related to 2025 Notes (Details) - 0.125% Convertible Senior Notes due 2025 $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 234
Amortization of issuance costs	835
Total	$ 1,069

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Matching contributions to the 401(k) plan	$ 0	$ 0

Leases - Additional Information

Leases - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Lessee, Lease, Description [Line Items]
Undiscounted future payments	$ 70,354
Operating Lease Not Yet Commenced One
Lessee, Lease, Description [Line Items]
Undiscounted future payments	$ 19,000
Lessee, operating lease, lease not yet commenced, term of contract	7 years 9 months 18 days
Operating Lease Not Yet Commenced Two
Lessee, Lease, Description [Line Items]
Undiscounted future payments	$ 4,200
Lessee, operating lease, lease not yet commenced, term of contract	8 years 3 months 18 days
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	5 years
Operating lease, termination term	3 years

Leases - Summary of Components

Leases - Summary of Components of Lease Cost Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 4,755	$ 3,960
Short-term lease cost	792	899
Operating lease, non-cash lease expense	$ 4,000	$ 3,200

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information and Non-cash Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Cash paid for amounts included in measurement of lease liabilities	$ 4,483	$ 3,134
Operating lease assets obtained in exchange for new lease liabilities	$ 0	$ 1,862

Leases - Summary of Maturities

Leases - Summary of Maturities of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2021USD ($)
Leases [Abstract]
Remainder of 2021	$ 14,349
2022	20,023
2023	17,898
2024	2,572
2025	2,766
2026	12,746
Total lease payments	70,354
Less: imputed interest	(7,108)
Present value of lease liabilities	$ 63,246

Leases - Summary of Weighted Av

Leases - Summary of Weighted Average Remaining Lease Term and Discount Rate (Details)	Mar. 31, 2021
Leases [Abstract]
Weighted-average remaining lease term (in years)	4 years 3 months 18 days
Weighted-average discount rate	4.71%

Revenue - Schedule of Revenue b

Revenue - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue by geographic area	$ 198,549	$ 131,248
North America
Disaggregation of Revenue [Line Items]
Revenue by geographic area	142,890	99,382
International
Disaggregation of Revenue [Line Items]
Revenue by geographic area	$ 55,659	$ 31,866

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 96.4	$ 68.1
Allowance for doubtful accounts receivable deemed uncollectible	0.2	0.2
Unbilled accounts receivable	$ 25.6		$ 20.1
Deferred contract costs amortization period	4 years
Deferred contract costs	$ 43.3		40.4
Amortization expense	3.8	$ 2.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations			$ 434.1
Remaining performance obligations, expected to recognize period			24 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 464.3
Remaining performance obligations, expected to recognize period	24 months

Revenue - Schedule of Deferred

Revenue - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Movement In Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 40,388
Additions to deferred contract costs	6,711
Amortization of deferred contract costs	(3,779)	$ (2,185)
Ending balance	$ 43,320

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended		12 Months Ended
	Feb. 28, 2021shares	Jun. 30, 2020shares	Nov. 30, 2019shares	Sep. 30, 2019	Mar. 31, 2021USD ($)voteplanclass$ / sharesshares	Mar. 31, 2020USD ($)$ / shares	Dec. 31, 2020USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock classes | class					2
Number of equity incentive plan | plan					2
Stock issuable upon the exercise of options outstanding (in shares)					25,652,059		27,068,323
Options granted (in shares)					0
Proceeds from exercise of stock options | $					$ 3,275	$ 2,813
Share-based payment arrangement, expense | $					28,861	12,060
Amounts withheld on behalf of employees for a future purchase | $					245	$ 0
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to unvested awards not yet recognized | $					$ 53,500		$ 60,600
Weighted average period over compensation cost related to unvested employee awards					1 year 10 months 24 days		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 | $					$ 3,300	$ 2,800
Intrinsic value of options exercised | $					123,600	86,500
Aggregate fair value of options vested | $					$ 7,400	$ 3,800
Early exercise of common stock (in shares)					238,500		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 2 months 12 days		3 years 4 months 24 days
Common stock granted					387,107
Total compensation cost related to unvested awards not yet recognized | $					$ 298,100		$ 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 | $					1,600
Amounts withheld on behalf of employees for a future purchase | $					$ 7,800
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					13,014,453
Common stock, authorized (in shares)					310,000,000		310,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001
Common stock, issued (in shares)					75,385,154		87,369,554
Stock issuable upon the exercise of options outstanding (in shares)					25,617,708		27,033,564
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
Common stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001
Common stock, issued (in shares)					232,419,196		218,510,509
Stock issuable upon the exercise of options outstanding (in shares)					34,351		34,759
Class A Common Stock | Service-based Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock granted	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)					57,863,748
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)					12,281,683

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Stock Option Activity and Weighted Average Exercise Prices (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Number Of Options Outstanding
Beginning balance (in shares)	27,068,323
Options granted (in shares)	0
Options exercised (in shares)	(1,320,113)
Options forfeited or expired (in shares)	(96,151)
Ending balance (in shares)	25,652,059	27,068,323
Exercisable (in shares)	16,917,990
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 3.31
Options granted (in dollars per share)	0
Options exercised (in dollars per share)	2.49
Options forfeited or expired (in dollars per share)	4.86
Ending balance (in dollars per share)	3.34	$ 3.31
Exercisable (in dollars per share)	$ 1.58
Weighted-average remaining contractual life (in years)	6 years 4 months 24 days	6 years 8 months 12 days
Exercisable (in years)	5 years 8 months 12 days
Aggregate intrinsic value	$ 2,052,059	$ 2,575,069

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Activity for Unvested RSUs (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Shares
Beginning balance (in shares) | shares	5,166,720
Awarded (in shares) | shares	387,107
Vested (in shares) | shares	(348,352)
Forfeited/canceled (in shares) | shares	(63,269)
Ending balance (in shares) | shares	5,142,206
Weighted- Average Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 59.50
Awarded (in shares) | $ / shares	92.15
Vested (in shares) | $ / shares	40.82
Forfeited/cancelled ((in dollars per share) | $ / shares	50.91
Ending balance (in dollars per share) | $ / shares	$ 63.33

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	$ 28,861	$ 12,060
Capitalized stock-based compensation expense	2,153	103
Total stock-based compensation expense	31,014	12,163
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	701	231
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	16,069	5,847
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	7,010	3,074
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation, net of amounts capitalized	$ 5,081	$ 2,908

Interest Income and Other Inc_3

Interest Income and Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest and Other Income [Abstract]
Interest income	$ 5,898	$ 3,778
Other expense, net	(125)	(175)
Interest income and other income, net	$ 5,773	$ 3,603

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Taxes [Line Items]
Effective tax rate	(4.30%)	2.90%

Net (Loss) Income Per Share - S

Net (Loss) Income 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
	Mar. 31, 2021	Mar. 31, 2020
Basic net (loss) income per share:
Net (loss) income	$ (13,068)	$ 6,479
Weighted-average shares used in calculating net income (loss) per share, basic (in shares)	306,034	295,455
Basic net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.02
Diluted net (loss) income per share:
Net (loss) income attributable to common stockholders	$ (13,068)	$ 6,479
Number of shares used in basic calculation (in shares)	306,034	295,455
Weighted-average effect of diluted securities:
Number of shares used in diluted calculation (in shares)	306,034	327,801
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.02
Class A Common Stock
Basic net (loss) income per share:
Net (loss) income	$ (9,547)	$ 1,852
Weighted-average shares used in calculating net income (loss) per share, basic (in shares)	223,566	84,434
Basic net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.02
Diluted net (loss) income per share:
Net (loss) income attributable to common stockholders	$ (9,547)	$ 1,852
Reallocation of undistributed (loss) income as a result of conversion of Class B to Class A shares	(3,521)	4,627
Allocation of undistributed (loss) income	$ (13,068)	$ 6,479
Number of shares used in basic calculation (in shares)	223,566	84,434
Weighted-average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding (in shares)	82,468	211,021
Number of shares used in diluted calculation (in shares)	306,034	327,801
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.02
Class A Common Stock | Employee stock options
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	30,708
Class A Common Stock | Employee stock purchase plan
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	129
Class A Common Stock | Unvested early exercises
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	1,139
Class A Common Stock | Restricted Stock Units
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	126
Class A Common Stock | Unvested restricted stock in connection with acquisition
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	244
Class B Common Stock
Basic net (loss) income per share:
Net (loss) income	$ (3,521)	$ 4,627
Weighted-average shares used in calculating net income (loss) per share, basic (in shares)	82,468	211,021
Basic net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.02
Diluted net (loss) income per share:
Net (loss) income attributable to common stockholders	$ (3,521)	$ 4,627
Reallocation of undistributed (loss) income as a result of conversion of Class B to Class A shares	0	0
Allocation of undistributed (loss) income	$ (3,521)	$ 4,627
Number of shares used in basic calculation (in shares)	82,468	211,021
Weighted-average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding (in shares)	0	0
Number of shares used in diluted calculation (in shares)	82,468	211,021
Diluted net income (loss) per share (in dollars per share)	$ (0.04)	$ 0.02
Class B Common Stock | Employee stock options
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	0
Class B Common Stock | Employee stock purchase plan
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	0
Class B Common Stock | Unvested early exercises
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	0
Class B Common Stock | Restricted Stock Units
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	0
Class B Common Stock | Unvested restricted stock in connection with acquisition
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	0

Net (Loss) Income Per Share -_2

Net (Loss) Income Per Share - Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	39,650	4,569
Shares subject to outstanding stock options and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	30,794	4,352
Unvested early exercised stock options and restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations (in shares)	620	0
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)	138	217
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

Subsequent Events (Details)

Subsequent Events (Details) - Sqreen, Inc - Subsequent Event $ in Millions	1 Months Ended
	Apr. 30, 2021USD ($)
Subsequent Event [Line Items]
Purchase consideration in cash and stock to acquire business	$ 260
Purchase consideration in cash and stock to acquire business deferred percentage	25.00%

Uncategorized Items - ddog-2021

Label	Element	Value
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 3,613,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 3,808,000