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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)					12 Months Ended
	Sep. 25, 2019 USD ($) $ / shares shares	Sep. 23, 2019 USD ($) $ / shares shares	Sep. 06, 2019 shares	Jan. 02, 2018	Dec. 31, 2019 USD ($) Segment Customer shares	Dec. 31, 2018 USD ($) Customer shares	Dec. 31, 2017 USD ($) Customer	Jan. 01, 2019 USD ($)	Jan. 01, 2017 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs					$ 706,317,000
Stock split, conversion ratio			0.333	0.25
Common stock, shares authorized \| shares		2,330,000,000	380,000,000		0	380,000,000
Preferred stock, shares authorized \| shares		20,000,000			20,000,000	0
Number of operating segment \| Segment					1
Number of reportable segment \| Segment					1
Other-than-temporary-impairment charges					$ 0	$ 0
Allowance for doubtful accounts receivable deemed uncollectible					$ 900,000	400,000
Deferred contract costs amortization period					4 years
Sales commissions related to renewals					$ 0
Impairment of goodwill					0	0	$ 0
Revenue recognized					71,000,000	37,100,000	$ 9,200,000
Operating lease assets					53,002,000			$ 47,900,000
Lease liability					60,426,000			$ 51,400,000
Adoption of ASU 606 \| Accumulated Deficit
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Decrease to accumulated deficit									$ 2,700,000
Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Unbilled accounts receivable					$ 14,400,000	$ 13,100,000
Other than United States
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing greater than 10% \| Customer					0	0	0
United States
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of long lived assets					70.00%	85.00%
Europe
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of long lived assets					30.00%	15.00%
Customer Concentration Risk \| Revenue
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing greater than 10% \| Customer					0	0	0
Customer Concentration Risk \| Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of major customers representing greater than 10% \| Customer					0	0
Sales and Marketing
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Advertising costs					$ 9,500,000	$ 8,300,000	$ 4,400,000
Initial Public Offering
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net offering costs					$ 2,000,000
Class A Common Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs		$ 615,600,000
Common stock, shares authorized \| shares		2,000,000,000			2,000,000,000	0
Class A Common Stock \| Initial Public Offering
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued \| shares		24,000,000
Common stock offering price \| $ / shares		$ 27.00
Class A Common Stock \| Underwriters
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued \| shares	3,600,000
Common stock offering price \| $ / shares	$ 27.00
Net proceeds from common stock shares issued	$ 92,300,000
Class B Common Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock converted into common stock \| shares		179,011,431
Common stock, shares authorized \| shares		310,000,000			310,000,000	0
Class B Common Stock \| Initial Public Offering
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock converted into common stock \| shares		179,011,431
Convertible Preferred Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock, shares authorized \| shares			179,814,912		0	179,814,912

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

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

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

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

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

Organization and Description of Business

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Description of Business

1. 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 and log management, 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.

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

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

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2019

Payables And Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

8. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31, 2019		December 31, 2018
Accrued compensation and commissions	$	21,910	$	15,229
Accrued expenses		12,692		6,940
Early exercise liability-stock options		1,776		2,931
Payroll and sales taxes		1,626		1,147
Other tax liability		742		516
Deferred rent		—		3,527
Total accrued expenses and other current liabilities	$	38,746	$	30,290

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

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

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

Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments Debt And Equity Securities [Abstract]

Summary of Available-for-Sale Marketable Securities

The following is a summary of available-for-sale marketable securities, excluding those securities classified within cash and cash equivalents on the consolidated balance sheet as of December 31, 2019 (in thousands):

	Amortized Cost		Unrealized Gain		Unrealized Losses			Fair Value
Commercial debt securities	$	80,376	$	46	$	(5	)	$	80,417
U.S. government treasury securities		72,467		10		(4	)		72,473
Commercial paper		23,784		—		—			23,784
Marketable securities	$	176,627	$	56	$	(9	)	$	176,674

Summary of Fair Values of Available-for-Sale Marketable Securities, by Remaining Contractual Maturity

As of December 31, 2019, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands):

Due within one year	$	97,816
Due in one year through five years		78,858
Total	$	176,674

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

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

Basis of Presentation and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Revenue by Geographic Area

Revenue by location is determined by the billing address for the customer. The following table sets forth revenue by geographic area (in thousands):

	Year Ended December 31,
	2019		2018		2017
North America	$	272,190	$	150,945	$	76,352
International		90,590		47,132		24,409
Total	$	362,780	$	198,077	$	100,761

Schedule of Deferred Contract Costs

The following table represents a rollforward of the Company’s deferred contract costs (in thousands):

	Amount
Balance as of January 1, 2017	$	2,677
Additions to deferred contract costs		3,352
Amortization of deferred contract costs		(1,274	)
Balance as of December 31, 2017	$	4,755
Additions to deferred contract costs		8,925
Amortization of deferred contract costs		(2,671	)
Balance as of December 31, 2018	$	11,009
Additions to deferred contract costs		20,146
Amortization of deferred contract costs		(5,400	)
Balance as of December 31, 2019	$	25,755

Schedule of Long-lived Assets Amortized Over Estimated Useful Lives

Long-lived assets with finite lives include property and equipment, capitalized development software costs and acquired intangible assets. Long-lived assets are amortized over their estimated useful lives which are as follows:

Computers and equipment		3 years
Furnitures and fixtures		5 years
Leasehold improvements		Shorter of lease term or useful life of asset
Capitalized software development costs		2 years
Intangible assets		1-3 years

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

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

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

Acquisition, Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Thousands				12 Months Ended
	Nov. 06, 2019	Sep. 28, 2018	Mar. 28, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration				$ 2,138	$ 1,618	$ 4,957
Intangible amortization expense				$ 800	$ 500	$ 500
2019 Acquisition
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration	$ 2,200
Madumbo
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration		$ 1,600
Transaction costs		$ 100
Focusmatic
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration			$ 5,400
Transaction costs			$ 100
Issuance of common stock for acquisition			2,292,012

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

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

Stockholders' Equity (Deficit)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Stockholders' Equity (Deficit)

11. Stockholders’ Equity (Deficit)

In January 2018, the Company converted the then outstanding shares of non-voting common stock to common stock. The non-voting common stock had the same rights and preferences as common stock except that the non-voting stock did not contain any voting rights.

In March 2019, certain investors proposed a tender offer to purchase shares of the Company’s capital stock from certain stockholders at a price of $15.92 per share, pursuant to an offer to purchase to which the Company was not a party. The Company agreed to waive certain transfer restrictions in connection with, and assist in the administration of, the tender offer. The tender offer was completed in the second quarter of 2019, and an aggregate of 14,366,871 shares of the Company’s capital stock were successfully tendered, including 803,481 shares of Preferred stock that converted into an equal number of shares of common stock in conjunction with the sale.

As of December 31, 2019, the Company had authorized 2,000,000,000 shares of Class A common stock and 310,000,000 shares of Class B common stock, each at a par value per share of $0.00001, of which 64,308,498 shares of Class A common stock and 232,078,452 shares of Class B common stock were issued and outstanding.

At December 31, 2019 and 2018, the Company had reserved shares of common stock for future issuance as follows:

	December 31,
	2019		2018
Seed Preferred Stock		—		19,403,952
Series A Preferred Stock		—		49,195,632
Series B Preferred Stock		—		39,619,992
Series C Preferred Stock		—		30,389,424
Series D Preferred Stock		—		41,205,912
2012 and 2019 stock option plans:
Options and RSU's outstanding		37,031,861		38,865,057
Shares available for future option and RSU grants		31,729,237		69,225
Shares available subject to the 2019 ESPP Plan		6,725,000		—
		75,486,098		218,749,194

Convertible Preferred Stock—Immediately prior to the completion of the IPO in September 2019, all shares of convertible preferred stock then outstanding were converted into 179,011,431 shares of Class B common stock.

Class A and Class B Common Stock—The Company has two classes of common stock, Class A and Class B. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder, and are automatically converted upon sale or transfer to Class A common stock, subject to certain limited exceptions.

During the year ended December 31, 2019, 36,464,053 shares of Class B common stock were converted into Class A common stock.

Employee Stock Purchase Plan—In September 2019, the Board adopted and approved the 2019 ESPP, which became effective on September 18, 2019. The ESPP initially reserved and authorized the issuance of up to a total of 6,725,000 shares of Class A common stock to participating employees. As of December 31, 2019, 6,725,000 shares of Class A common stock remain available for grant under the ESPP. The initial offering period began on September 18, 2019 and will end on May 15, 2020. On each purchase date, eligible employees will purchase the shares at a price per share equal to 85% of the lesser of (1) the $27.00 initial public offering price of the Company’s Class A common stock or (2) the fair market value of the Company’s Class A common stock on the purchase date, as defined in the ESPP.

The Company recognized $1.2 million of stock-based compensation expense related to the ESPP during the year ended December 31, 2019, beginning upon the IPO in September 2019. Total compensation cost related to the ESPP not yet recognized was approximately $1.5 million as of December 31, 2019. The weighted average period over which this compensation cost will be recognized is 0.4 years as of December 31, 2019.

As of December 31, 2019, $3.3 million has been withheld on behalf of employees for a future purchase under the ESPP. There were no purchases for the year ended December 31, 2019 related to the ESPP.

Stock-Based Compensation—The Company has two equity incentive plans, the 2012 equity incentive plan (the “2012 Plan”) and the 2019 equity incentive plan (the “2019 Plan”). On September 18, 2019, the Company ceased granting awards under the 2012 Plan, and all shares that remained available for issuance under the 2012 Plan at that time were transferred to the 2019 Plan. Additionally, as of December 31, 2019, there were 36,364,067 shares of Class A common stock issuable upon conversion of Class B common stock underlying options outstanding under the 2012 Plan. Under the 2019 Plan, the Board and any other committee or subcommittee of the Board may grant stock options, stock appreciation rights, restricted stock awards, RSUs and performance-based and other awards, each valued or based on the Company’s Class A common stock, to employees, consultants, and advisors of the Company. Through December 31, 2019, the Company has only issued stock options and RSUs in connection with the 2012 and 2019 Plans. As of December 31, 2019, the Company was authorized to grant awards representing up to 70,296,733 shares under the 2019 Plan and had awards representing 31,729,237 shares of Class A common stock available to grant under the 2019 Plan.

The Company uses the Black-Scholes option pricing model to value stock options. The fair value of each award is recognized on a straight-line basis over the vesting or service period, which is typically four years. The Black-Scholes model requires specified inputs to determine the fair value of stock-based awards, consisting of (i) the expected volatility of the Company’s common stock over the expected option life, (ii) the risk-free interest rate, (iii) the expected dividend yield, and (iv) the expected option life.

The following table summarizes the assumptions used during the years ended December 31, 2019, 2018 and 2017:

	Year Ended December 31,
	2019	2018	2017
Expected volatility	38.9% - 39.5%	38.4% - 39.0%	37.1% - 38.8%
Risk-free interest rate	1.4% - 2.6%	2.6% - 3.0%	1.8% - 2.2%
Expected dividend yield	—%	—%	—%
Expected term (in years)	5.2 - 6.3	5.8 - 6.1	5.1 - 6.1
Fair value of common stock	$6.16 - $38.21	$2.23 - $5.63	$0.87 - $1.02

Expected volatility—The Company performed an analysis of its peer companies with similar expected lives to develop an expected volatility assumption.

Expected term—Derived from the life of the options granted under the option plan and is based on the simplified method which is essentially the weighted average of the vesting period and contractual term.

Risk-free interest rate—Based upon quoted market yields for the United States Treasury debt securities.

Expected dividend yield—Since the Company has never paid and has no intention to pay cash dividends on common stock, the expected dividend yield is zero.

Fair value of the common stock—Prior to the IPO, the fair value of common stock underlying the stock-based awards was determined by the Company’s Board of Directors. The Board of Directors considered numerous objective and subjective factors to determine the fair value of the Company’s common stock at each meeting in which awards were approved. The factors considered included, but were not limited to: (i) the results of contemporaneous independent third-party valuations of the Company’s common stock; (ii) the prices, rights, preferences, and privileges of the Company’s redeemable convertible Preferred Stock relative to those of its common stock; (iii) the lack of marketability of the Company’s common stock; (iv) actual operating and financial results; (v) current business conditions and projections; (vi) the likelihood of achieving a liquidity event, such as an initial public offering or sale of the Company, given prevailing market conditions; and (vii) precedent transactions involving the Company’s shares. Since the Company’s IPO, the fair value of the underlying common stock is determined by the closing price, on the date of grant, of the Company’s Class A common stock, which is traded publicly on The Nasdaq Global Market.

Stock option activity during the years ended December 31, 2019, 2018 and 2017 is as follows:

	Number Of Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)
Balance—January 1, 2017		35,825,160		$	0.39		8.9
Options granted		12,841,968		$	0.89
Options exercised		(2,165,976	)	$	0.21
Options forfeited		(1,623,264	)	$	0.64
Balance—December 31, 2017		44,877,888		$	0.53		8.3
Options granted		11,236,803		$	1.61
Options exercised		(14,882,622	)	$	0.52
Options forfeited		(2,367,012	)	$	0.79
Balance—December 31, 2018		38,865,057		$	0.83		7.9
Options granted		9,518,730		$	9.15
Options exercised		(10,546,987	)	$	0.75
Options forfeited		(1,452,033	)	$	2.54
Balance—December 31, 2019		36,384,767		$	2.96		7.6
Exercisable—December 31, 2019		22,327,967		$	2.19		7.0

As of December 31, 2019, there were 20,700 shares of Class A common stock and 36,364,067 shares of Class B common stock issuable upon the exercise of options outstanding.

The weighted average grant-date fair value of options granted during 2019, 2018 and 2017 was $8.69, $2.48 and $0.40, respectively. The Company received approximately $7.9 million, $7.8 million and $0.5 million in cash proceeds from options exercised during 2019, 2018 and 2017, respectively. The intrinsic value of options exercised in 2019, 2018 and 2017 was approximately $121.3 million, $36.4 million and $1.5 million, respectively. The aggregate fair value of options vested during 2019, 2018 and 2017 was $10.8 million, $3.5 million and $4.2 million, respectively.

Total compensation cost related to unvested stock options not yet recognized was approximately $90.5 million and $28.4 million as of December 31, 2019 and December 31, 2018, respectively. The weighted average period over which this compensation cost related to unvested stock options will be recognized is 2.7 years and 3.4 years as of December 31, 2019 and December 31, 2018, respectively.

The following table summarizes the activity for the Company's unvested RSUs:

	Shares		Weighted-Average Fair Value
Balance at December 31, 2018		—	$	—
Granted		647,094	$	36.08
Vested		—	$	—
Forfeited/canceled		—	$	—
Balance at December 31, 2019		647,094	$	36.08

In November 2019, the Company granted 244,445 restricted shares of Class A common stock, which are subject to service-based vesting conditions over approximately four years. Total compensation cost related to unvested RSUs and restricted shares of common stock not yet recognized was approximately $30.4 million as of December 31, 2019. The weighted average period over which this compensation cost related to unvested RSUs will be recognized is 3.9 years as of December 31, 2019. The Company expects to settle RSUs with shares of its Class A common stock.

Stock-based compensation expense was included in the consolidated statement of operations as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of revenue	$	582	$	287	$	112
Research and development		7,972		1,641		1,160
Sales and marketing		5,538		1,910		977
General and administrative		4,942		1,406		819
Stock-based compensation, net of amounts capitalized		19,034		5,244		3,068
Capitalized stock-based compensation expense		201		167		248
Total stock-based compensation expense	$	19,235	$	5,411	$	3,316

Common 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 1,239,750 shares of common stock and 2,095,656 shares of common stock as of December 31, 2019 and 2018, respectively.

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

Property and Equipment, Net

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property and Equipment, Net

6. Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

	December 31, 2019			December 31, 2018
Computers and equipment	$	7,536		$	4,540
Furniture and fixtures		4,804			2,621
Leasehold improvements		16,517			8,554
Capitalized software development costs		24,630			15,000
Total property and equipment	$	53,487		$	30,715
Less: accumulated depreciation and amortization		(20,738	)		(9,066	)
Total property and equipment, net	$	32,749		$	21,649

As discussed in Note 2, Basis of Presentation and Summary of Significant Accounting Policies—Internal Use Software Development Costs, the Company capitalizes costs related to the development of computer software for internal use and is included in capitalized software development costs within property and equipment, net.

Depreciation and amortization expense was approximately $11.6 million, $5.5 million, and $2.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Subsequent Events

12 Months Ended

Dec. 31, 2019

Subsequent Events [Abstract]

Subsequent Events

14. Subsequent Events

In January 2020, the Company entered into an agreement with Microsoft Azure to purchase an aggregate of at least $21.0 million of cloud services over the course of three years through January 2023.

Acquisition, Intangible Assets and Goodwill

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Acquisition, Intangible Assets and Goodwill

7. Acquisition, Intangible Assets and Goodwill

2019 Acquisition

On November 6, 2019, the Company entered into a Stock Purchase Agreement whereby the Company acquired all of the issued and outstanding shares of a target company for $2.2 million in cash consideration. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations. Goodwill resulted primarily from the expectation of integrating and enhancing the Company's current data streaming platform. The preliminary allocation of the purchase price was based on available information and assumptions at the time of the initial valuation and may be subject to change within the measurement period. The results of the operations have been included in the Company’s consolidated statements of operations and comprehensive loss since the acquisition date and were not material. Pro forma results of operations for this acquisition have not been presented because it was also not material to the consolidated results of operations.

The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands):

	Fair Value
Fair value of net assets acquired:
Net tangible assets	$	9
Software technology		910
Goodwill		1,285
Total fair value of net assets acquired	$	2,204

Madumbo Acquisition

On September 28, 2018, the Company entered into a Stock Purchase Agreement with Madumbo whereby the Company acquired all of the issued and outstanding shares of Madumbo for $1.6 million in cash consideration. Madumbo created an artificial intelligence platform that the Company plans to use to strengthen the Company’s current product offering. Goodwill was not deductible for tax purposes. Goodwill resulted primarily from the expected integration of Madumbo’s platform with the Company’s existing product offerings. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations. The results of Madumbo’s operations have been included in the Company’s consolidated statements of operations and comprehensive loss since the acquisition date and were not material. Pro forma results of operations for this acquisition have not been presented because it was also not material to the consolidated results of operations. Transaction costs amounted to approximately $0.1 million and were expensed as incurred.

The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands):

	Fair Value
Fair value of net assets acquired:
Net tangible assets (liabilities)	$	(536	)
Developed technology		825
Goodwill		1,334
Total fair value of net assets acquired	$	1,623

Focusmatic Acquisition

On March 28, 2017, the Company completed an acquisition of Focusmatic SAS (“Focusmatic”). Focusmatic is a log processing and analytics company that aligns with the Company’s goal of improving visibility for its customers IT infrastructure. Goodwill was not deductible for tax purposes. Pursuant to the Agreement and Plan of Merger, the entire ownership of Focusmatic was purchased by the Company in exchange for 2,292,012 shares of the Company’s common stock and $5.4 million of cash consideration. Goodwill resulted primarily from the expected integration of the employee base and product offerings of Focusmatic with the Company. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations with the results of Focusmatic’s operations included in the consolidated financial statements from the date of acquisition. Results of operations for this acquisition have been included in the Company’s consolidated statements of operations and comprehensive loss since the acquisition date and were not material. Pro forma results of operations for this acquisition have not been presented because it was also not material to the consolidated results of operations. Transaction costs amounted to approximately $0.1 million and were expensed as incurred.

The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands):

	Fair Value
Fair value of purchase consideration:
Cash consideration	$	5,397
Common stock		2,015
Total fair value of net assets acquired	$	7,412

	Fair Value
Fair value of net assets acquired:
Net tangible assets (liabilities)	$	(200	)
Developed technology		1,300
Customer relationships		20
Goodwill		6,292
Total fair value of net assets acquired	$	7,412

Intangibles, net consisted of the following (in thousands):

December 31, 2019

Gross

Carrying

Amount

Accumulated

Amortization

Net

Carrying

Amount

Amortization

Period

Developed technology

3,046

(1,611

)

1,435

2-3 years

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Amortization Period
Developed technology	$	2,125	$	(837	)	$	1,288	2-3 years
Customer relationships		20		(20	)		—	1 year
Total	$	2,145	$	(857	)	$	1,288

Intangible amortization expense was approximately $0.8 million, $0.5 million and $0.5 million for the years ended December 31, 2019, 2018 and 2017, respectively. Amortization of developed technology and customer relationships are included in cost of revenue on the Company’s consolidated statement of operations and comprehensive loss.

As of December 31, 2019, future amortization expense by year is expected to be as follows (in thousands):

	Amount
2020	$	675
2021		501
2022		259
Total	$	1,435

The changes in the carrying amount of goodwill were as follows (in thousands):

	Amount
Balance as of December 31, 2017	$	6,292
Madumbo acquisition		1,334
Balance as of December 31, 2018	$	7,626
2019 acquisition		1,285
Foreign currency translation adjustments		147
Balance as of December 31, 2019	$	9,058

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

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

Organization and Description of Business - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Date of Incorporation	Jun. 04, 2010

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

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

Stockholders' Equity (Deficit) (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Reserved Shares of Common Stock for Future Issuance

At December 31, 2019 and 2018, the Company had reserved shares of common stock for future issuance as follows:

	December 31,
	2019		2018
Seed Preferred Stock		—		19,403,952
Series A Preferred Stock		—		49,195,632
Series B Preferred Stock		—		39,619,992
Series C Preferred Stock		—		30,389,424
Series D Preferred Stock		—		41,205,912
2012 and 2019 stock option plans:
Options and RSU's outstanding		37,031,861		38,865,057
Shares available for future option and RSU grants		31,729,237		69,225
Shares available subject to the 2019 ESPP Plan		6,725,000		—
		75,486,098		218,749,194

Summary of Fair Value Assumptions

The following table summarizes the assumptions used during the years ended December 31, 2019, 2018 and 2017:

	Year Ended December 31,
	2019	2018	2017
Expected volatility	38.9% - 39.5%	38.4% - 39.0%	37.1% - 38.8%
Risk-free interest rate	1.4% - 2.6%	2.6% - 3.0%	1.8% - 2.2%
Expected dividend yield	—%	—%	—%
Expected term (in years)	5.2 - 6.3	5.8 - 6.1	5.1 - 6.1
Fair value of common stock	$6.16 - $38.21	$2.23 - $5.63	$0.87 - $1.02

Summary of Stock Option Activity

Stock option activity during the years ended December 31, 2019, 2018 and 2017 is as follows:

	Number Of Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)
Balance—January 1, 2017		35,825,160		$	0.39		8.9
Options granted		12,841,968		$	0.89
Options exercised		(2,165,976	)	$	0.21
Options forfeited		(1,623,264	)	$	0.64
Balance—December 31, 2017		44,877,888		$	0.53		8.3
Options granted		11,236,803		$	1.61
Options exercised		(14,882,622	)	$	0.52
Options forfeited		(2,367,012	)	$	0.79
Balance—December 31, 2018		38,865,057		$	0.83		7.9
Options granted		9,518,730		$	9.15
Options exercised		(10,546,987	)	$	0.75
Options forfeited		(1,452,033	)	$	2.54
Balance—December 31, 2019		36,384,767		$	2.96		7.6
Exercisable—December 31, 2019		22,327,967		$	2.19		7.0

Summary of Activity for Unvested RSUs

The following table summarizes the activity for the Company's unvested RSUs:

	Shares		Weighted-Average Fair Value
Balance at December 31, 2018		—	$	—
Granted		647,094	$	36.08
Vested		—	$	—
Forfeited/canceled		—	$	—
Balance at December 31, 2019		647,094	$	36.08

Summary of Stock-based Compensation Expense

Stock-based compensation expense was included in the consolidated statement of operations as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of revenue	$	582	$	287	$	112
Research and development		7,972		1,641		1,160
Sales and marketing		5,538		1,910		977
General and administrative		4,942		1,406		819
Stock-based compensation, net of amounts capitalized		19,034		5,244		3,068
Capitalized stock-based compensation expense		201		167		248
Total stock-based compensation expense	$	19,235	$	5,411	$	3,316

Net (Loss) Income Per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Net (Loss) Income Per Share

13. Net (Loss) Income Per Share

Basic and diluted net income (loss) per common share is presented in conformity with the two-class method required for participating securities.

The following table presents the calculation of basic and diluted net (loss) income per share (in thousands, except per share data):

	Year Ended December 31,
	2019						2018			2017
Basic net loss per share:	Class A			Class B
Numerator:
Net loss	$	(1,149	)	$	(15,561	)	$	(10,762	)	$	(2,570	)
Denominator:
Weighted average shares used in calculating net loss per share, basic		9,611			130,262			70,951			61,321
Basic net loss per share	$	(0.12	)	$	(0.12	)	$	(0.15	)	$	(0.04	)
Diluted net loss per share:
Numerator:
Allocation of distributed loss for basic computation	$	(1,149	)	$	(15,561	)	$	(10,762	)	$	(2,570	)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares		(15,561	)		—			—			—
Allocation of undistributed loss	$	(16,710	)	$	(15,561	)	$	(10,762	)	$	(2,570	)
Denominator:
Number of shares used in basic calculation		9,611			130,262			70,951			61,321
Weighted average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding		130,262			—			—			—
Number of shares used in diluted calculation		139,873			130,262			70,951			61,321
Diluted net loss per share	$	(0.12	)	$	(0.12	)	$	(0.15	)	$	(0.04	)

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Convertible Preferred Stock		—		179,815		179,815
Shares subject to outstanding stock options and restricted stock units		37,032		38,865		44,877
Unvested early exercised stock options		1,240		2,096		263
Shares subject to the 2019 ESPP Plan		353		—		—
Total		38,625		220,776		224,955

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

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

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

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of December 31, 2019 and 2018, and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):

	Fair Value Measurement as of December 31, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash equivalents:
Money market funds	$	588,762	$	—	$	—	$	588,762
Marketable Securities:
Corporate debt securities		—		80,417		—		80,417
U.S. government treasury securities		—		72,473		—		72,473
Commercial paper		—		23,784		—		23,784
Total financial assets	$	588,762	$	176,674	$	—	$	765,436

	Fair Value Measurement as of December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash equivalents:
Money market funds	$	47,187	$	—	$	—	$	47,187
Total financial assets	$	47,187	$	—	$	—	$	47,187

Net (Loss) Income Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Calculation of Basic and Diluted Net (Loss) Income Per Share

The following table presents the calculation of basic and diluted net (loss) income per share (in thousands, except per share data):

	Year Ended December 31,
	2019						2018			2017
Basic net loss per share:	Class A			Class B
Numerator:
Net loss	$	(1,149	)	$	(15,561	)	$	(10,762	)	$	(2,570	)
Denominator:
Weighted average shares used in calculating net loss per share, basic		9,611			130,262			70,951			61,321
Basic net loss per share	$	(0.12	)	$	(0.12	)	$	(0.15	)	$	(0.04	)
Diluted net loss per share:
Numerator:
Allocation of distributed loss for basic computation	$	(1,149	)	$	(15,561	)	$	(10,762	)	$	(2,570	)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares		(15,561	)		—			—			—
Allocation of undistributed loss	$	(16,710	)	$	(15,561	)	$	(10,762	)	$	(2,570	)
Denominator:
Number of shares used in basic calculation		9,611			130,262			70,951			61,321
Weighted average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding		130,262			—			—			—
Number of shares used in diluted calculation		139,873			130,262			70,951			61,321
Diluted net loss per share	$	(0.12	)	$	(0.12	)	$	(0.15	)	$	(0.04	)

Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Convertible Preferred Stock		—		179,815		179,815
Shares subject to outstanding stock options and restricted stock units		37,032		38,865		44,877
Unvested early exercised stock options		1,240		2,096		263
Shares subject to the 2019 ESPP Plan		353		—		—
Total		38,625		220,776		224,955

Leases

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Leases

10. Leases

The Company has entered into various noncancelable operating leases for its facilities expiring between fiscal 2019 and 2025. 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 consolidated statements of operations and comprehensive loss were as follows (in thousands):

	Year Ended December 31, 2019
Operating lease cost⁽¹⁾	$	13,636
Variable lease cost⁽²⁾		94
Short-term lease cost		2,925

1)	Includes non-cash lease expense of $10.4 million

2)	Primarily related to Consumer Price Index adjustments, common area maintenance and property tax.

Supplemental cash flow information and non-cash activity related to the Company’s operating leases are as follows (in thousands):

Year Ended

December 31, 2019

Cash paid for amounts included in measurement of lease liabilities

9,767

Operating lease assets obtained in exchange for new lease liabilities

14,618

Maturities of lease liabilities by fiscal year for the Company’s operating leases are as follows (in thousands):

	Amount
2020	$	14,576
2021		16,944
2022		16,731
2023		14,569
2024 and beyond		4,017
Total lease payments	$	66,837
Less: imputed interest		(6,411	)
Present value of lease liabilities	$	60,426

As of December 31, 2019, the Company had one additional operating lease that has not yet commenced. This operating lease will commence in fiscal year 2020 with a lease term of six years. Pursuant to the terms of the office lease, the Company will pay $2.2 million in aggregate through the life of the lease.

Weighted average remaining lease term and discount rate for the Company’s operating leases are as follows:

December 31,

2019

Weighted average remaining lease term (years)

4.00

Weighted average discount rate

4.98

Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2019

Prepaid Expense And Other Assets Current [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	December 31, 2019		December 31, 2018
Hosting	$	9,180	$	3,356
General prepaid expenses		5,700		3,607
Other receivables		2,578		526
Rent		821		1,066
Marketing		516		218
Restricted cash		436		—
Total prepaid expenses and other current assets	$	19,231	$	8,773

Commitments and Contingencies

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

9. Commitments and Contingencies

Lease Commitments—The Company has entered into various noncancelable operating leases for its facilities expiring between fiscal 2019 and 2025. Certain operating leases contain provisions under which monthly rent escalates over time. When lease agreements contain escalating rent clauses or free rent periods, the Company recognizes rent expense on a straight-line basis over the term of the lease.

Rent expense for the years ended December 31, 2019, 2018 and 2017 was $16.7 million, $10.0 million and $3.8 million, respectively.

During 2019, 2018 and 2017, the Company recorded $1.0 million, $0.7 million and $0.1 million, respectively, in sub-lease income which were recorded as a credit to rent expense.

Non-Income Tax Matters—In January 2015, the Company recorded a $5.0 million contingent Federal payroll tax liability in conjunction with common stock repurchase transactions, as part of a capital raise, with certain of its employees. The potential payroll tax treatment of these transactions was subject to uncertainty, and the contingent payroll tax liability was deemed probable and reasonably estimable. On April 15, 2019, the period of limitations for assessing the contingent Federal payroll tax liability expired and the Company was legally released from being the primary obligor. As a result, the Company recognized a $5.0 million benefit in the operating expenses section of the consolidated statement of operations during the year ended December 31, 2019.

401(k) Plan—The Company sponsors a 401(k) defined contribution plan covering all eligible US employees. Contributions to the 401(k) plan are discretionary. The Company did not make any matching contributions to the 401(k) plan for the years ended December 31, 2019 and 2018.

Legal 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 consolidated statements of operations and comprehensive (loss) income in connection with the indemnification provisions have not been material.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Principles of Consolidation

The consolidated financial statements include the accounts of Datadog, Inc. and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

Initial Public Offering

On September 23, 2019, the Company completed its initial public offering (“IPO”), in which the Company issued and sold 24,000,000 shares of its Class A common stock at a public offering price of $27.00 per share, which resulted in net proceeds of $615.6 million after deducting underwriting discounts and commissions. On September 25, 2019, the underwriters exercised their option to purchase an additional 3,600,000 shares of Class A common stock at $27.00 per share, resulting in additional proceeds of $92.3 million, net of underwriters’ discounts and commissions. Immediately prior to the closing of the IPO, all shares of common stock then outstanding were reclassified as Class B common stock and all shares of the convertible preferred stock then outstanding automatically converted into 179,011,431 shares of Class B common stock.

The Company incurred $2.0 million of net offering costs in connection with the IPO which were recorded as an offset against IPO proceeds.

Stock Split and Authorized Shares

On January 2, 2018, the Company’s Board of Directors (the “Board”) and stockholders approved a 4-for-1 stock split of the Company’s then-outstanding common stock and convertible preferred stock was effected without any change in the par value per share.

On September 6, 2019, the Board and stockholders approved an amended and restated certificate of incorporation of the Company effecting a 3-for-1 stock split of the Company’s issued and outstanding shares of common stock and convertible preferred stock, and an increase to the authorized shares of the Company’s common stock and convertible preferred stock to 380,000,000 shares and 179,814,912 shares, respectively. The split was effected on September 6, 2019 and without any change in the par value per share.

All information related to the Company’s common stock, convertible preferred stock and stock awards has been retroactively adjusted to give effect to the 4-for-1 stock split on January 2, 2018 and 3-for-1 stock split on September 6, 2019.

On September 23, 2019, an amended and restated certificate of incorporation of the Company was filed immediately prior to the closing of the IPO authorizing an aggregate of 2,330,000,000 shares of capital stock of the Company, including 2,000,000,000 shares of Class A common stock, 310,000,000 shares of Class B common stock and 20,000,000 shares of preferred stock.

Segment Information

The Company has a single operating and reportable segment as well as one business activity, monitoring and providing analytics on companies’ information technology (“IT”) infrastructure. The Company’s chief operating decision maker is its Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance, and allocating resources. There are no segment managers who are held accountable for operations or results below the consolidated level.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Such estimates include the fair value of marketable securities, allowance for doubtful accounts, 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, fair value of common stock and redeemable convertible preferred stock prior to the IPO, valuation of long-lived assets and their recoverability, including goodwill, the incremental borrowing rate for operating leases, estimated expected period of benefit period for deferred contract costs, 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.

Foreign Currency Translation

The reporting currency of the Company is the United States dollar (“USD”). The functional currency of the Company is USD, and the functional currency of the Company’s subsidiaries is generally the local currency of the jurisdiction in which the foreign subsidiary is located. The assets and liabilities of the Company’s subsidiaries are translated to USD at exchange rates in effect at the balance sheet date. All income statement accounts are translated at monthly average exchange rates. Resulting foreign currency translation adjustments are recorded directly in accumulated other comprehensive (loss) income as a separate component of stockholders’ equity (deficit).

Transaction gains and losses that arise from exchange rate fluctuations on transactions denominated in a currency other than the functional currency are included in other income, net in the accompanying consolidated statements of operations when realized.

Revenue Recognition

The Company generates revenue from the sale of subscriptions to customers using its cloud-based platform. The terms of the Company’s subscription agreements are primarily monthly or annual. The Company’s customers can enter into (1) a subscription agreement for a committed contractual amount of usage that is apportioned ratably on a monthly basis over the term of the subscription period, (2) a subscription agreement for a committed contractual amount of usage that is delivered as used, or (3) a monthly subscription based on usage. The Company typically bills customers on an annual subscription in full up-front, with any usage in excess of the committed contracted amount billed monthly in arrears. The Company typically bills customers on a monthly plan in arrears. Customers also have the option to purchase additional services priced at rates at or above the stand-alone selling price.

The Company elected to early adopt Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“Topic 606”), effective January 1, 2017, using the full retrospective method of adoption. As such, the consolidated financial statements present revenue in accordance with Topic 606 for all of the periods presented.

The Company accounts for revenue contracts with customers through the following steps:

(1)

identify the contract with a customer;

(2)

identify the performance obligations in the contract;

(3)

determine the transaction price;

(4)

allocate the transaction price; and

(5)

recognize revenue when or as the Company satisfies a performance obligation.

The Company’s revenue arrangements may include infrastructure monitoring, application performance monitoring, log management, and synthetics, as well as secondary services including custom metrics in dashboard monitoring, serverless monitoring, docker container monitoring, and app analytics. The Company has identified each service as a separate performance obligation.

The transaction price is based on the fixed price for the contracted level of service plus variable consideration for additional optional purchases. Billing periods correspond to the periods over which services are performed and there are no discounts given on the purchase of future services.

The Company allocates revenue to each performance obligation based on its relative standalone selling price. The Company generally determines standalone selling prices based on a range of actual prices charged to customers.

Revenue is recognized when control of these services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to receive in exchange for those services. The Company determined an output method to be the most appropriate measure of progress because it most faithfully represents when the value of the services are simultaneously received and consumed by the customer, and control is transferred.

For committed contractual amounts of usage, revenue is recognized ratably over the term of the subscription agreement generally beginning on the date that the platform is made available to a customer. For committed contractual amount of usage that is delivered as used, a monthly subscription based on usage, or usage in excess of a ratable subscription, the Company recognizes revenue as the product is used. Subscription revenue excludes sales and other indirect taxes.

The Company applied the practical expedient in Topic 606 and did not evaluate contracts of one year or less for the existence of a significant financing component.

Cost of Revenue

Cost of revenue consists primarily of costs related to providing subscription services to paying customers, including data center and networking expenses, employee compensation (including stock-based compensation) and other employee-related expenses for customer experience and technical operations staff, payments to outside service providers, payment processing fees, amortization of capitalized internally developed software costs and acquired developed technology, and allocated overhead costs.

Research and Development Costs

Research and development costs are expensed as incurred. Research and development costs consist of employee compensation (including stock-based compensation) and other employee-related expenses, materials and supplies, and allocated overhead costs such as rent and facilities costs.

Sales and Marketing Costs

Sales and marketing costs consist primarily of personnel costs for the Company’s sales and marketing organization, including stock-based compensation and commissions, costs of general marketing and promotional activities, including the free tier and introductory trials of the Company’s products, travel-related expenses and allocated overhead costs.

Advertising Costs

Advertising costs are expensed as incurred and were approximately $9.5 million, $8.3 million and $4.4 million for the years ended December 31, 2019, 2018 and 2017, respectively, and are included in sales and marketing expense in the accompanying consolidated statement of operations.

Income Taxes

The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts for financial reporting and the tax bases of assets and liabilities. The deferred assets and liabilities are recorded at the statutorily enacted tax rates anticipated to be in effect when such temporary differences reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. A valuation allowance is established; when based upon the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

The Company engages in transactions in which the tax consequences may be subject to uncertainty. The Company accounts for uncertain tax positions based on an evaluation as to whether it is more likely than not that a tax position will be sustained on audit, including resolution of any related appeals or litigation processes. This evaluation is based on all available evidence and assumes that the appropriate tax authorities have full knowledge of all relevant information concerning the tax position. The Company accounts for uncertain tax positions as non-current tax liabilities or through a reduction of a corresponding deferred tax asset. The tax benefit recognized is based on the largest amount that is greater than 50% likely of being realized upon ultimate settlement. The Company includes potential interest expense and penalties related to its uncertain tax positions in income tax expense.

Stock-Based Compensation

The Company recognizes and measures compensation expense for all stock-based payment awards granted to employees, directors, and nonemployees, including stock options, restricted stock units (“RSUs”), and the employee stock purchase plan (the “ESPP”) based on the fair value of the awards on the date of grant. The fair value of each stock option granted is estimated using the Black Scholes option pricing model. 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.

The Company also has certain options that have performance-based vesting conditions; stock-based compensation expense for such awards is recognized on a straight-line basis from the time the vesting condition is likely to be met through the time the vesting condition has been achieved.

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash equivalents consist of funds deposited into money market funds.

Marketable Securities

The Company’s marketable securities consist of commercial debt securities, U.S. government treasury securities, and commercial paper. The Company determines the appropriate classification of its marketable securities at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its marketable securities as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its marketable securities within current assets on the consolidated balance sheet.

Available-for-sale securities are recorded at fair value each reporting period. Premiums and discounts are amortized or accreted over the life of the related available-for-sale security as an adjustment to yield using the effective interest method. Interest income is recognized when earned. Unrealized gains and losses on these marketable securities are reported as a separate component of accumulated other comprehensive (loss) income on the consolidated balance sheet until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income in the consolidated statements of operations. The Company periodically evaluates its marketable securities to assess whether those with unrealized loss positions are other than temporarily impaired. The Company considers various factors in determining whether to recognize an impairment charge. If the Company determines that the decline in an investment's fair value is other-than-temporary, the difference is recognized as an impairment loss in the consolidated statements of operations. As of December 31, 2019 and 2018, the Company has not recorded any other-than-temporary-impairment charges in its consolidated statements of operations.

Restricted Cash

Restricted cash primarily consists of collateralized letters of credit established in connection with lease agreements for the Company’s facilities. Restricted cash is included in current assets for leases that expire within one year and is included in non-current assets for leases that expire in more than one year from the balance sheet date.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to credit risk primarily consist of cash and cash equivalents, marketable securities and accounts receivable. Cash deposits may, at times, exceed amounts insured by the Federal Deposit Insurance Corporation (“FDIC”) and the Securities Investor Protection Corporation (“SIPC”). The Company has not experienced any losses on its deposits of cash and cash equivalents to date. For accounts receivable, the Company is exposed to credit risk in the event of nonpayment by customers to the extent of the amounts recorded on the accompanying consolidated balance sheets.

There were no customers representing greater than 10% of total revenue for the years ended December 31, 2019, 2018, and 2017. No customers represented greater than 10% of accounts receivable as of December 31, 2019 and 2018.

Geographical Information

Revenue by location is determined by the billing address for the customer. The following table sets forth revenue by geographic area (in thousands):

	Year Ended December 31,
	2019		2018		2017
North America	$	272,190	$	150,945	$	76,352
International		90,590		47,132		24,409
Total	$	362,780	$	198,077	$	100,761

Other than the United States, no other individual country accounted for 10% or more of total revenue for the years ended December 31, 2019, 2018, or 2017. As of December 31, 2019, and 2018, 70% and 85% of the Company’s long lived assets were located in the United States and 30% and 15% were located in Europe, respectively.

Fair Value of Financial Instruments

The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value as follows:

Level 1 Inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date.

Level 2 Inputs: Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability.

Level 3 Inputs: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date.

The Company’s financial instruments consist of cash equivalents, marketable securities, accounts receivable, accounts payable and accrued expenses. Cash equivalents are stated at amortized cost, which approximates fair value at the balance sheet dates, due to the short period of time to maturity. Marketable securities are recorded at fair value. Accounts receivable, accounts payable, and accrued expenses are stated at their carrying value, which approximates fair value due to the short time to the expected receipt or payment date.

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

Accounts Receivable

Accounts receivable includes billed and unbilled receivables. Trade accounts receivable are recorded at invoiced amounts and do not bear interest. The Company generally does not require collateral and provides for expected losses. The expectation of collectability is based on a review of credit profiles of customers, contractual terms and conditions, current economic trends, and historical payment experience. The Company regularly reviews the adequacy of the allowance for doubtful accounts by considering the age of each outstanding invoice and the collection history of each customer to determine the appropriate amount of allowance for doubtful accounts. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified. During the years ended December 31, 2019 and 2018, the Company charged $0.9 million and $0.4 million, respectively, of accounts receivable deemed uncollectible against the allowance for doubtful accounts.

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, substantially all of which is expected to be billed and collected within one year. As of December 31, 2019 and 2018, unbilled accounts receivable of approximately $14.4 million and $13.1 million, respectively, was included in accounts receivable on the Company’s consolidated balance sheets.

Internal Use Software Development Costs

The Company capitalizes qualifying internal use software development costs related to its cloud platform. The costs consist of personnel costs (including related benefits and stock-based compensation) that are incurred during the application development stage. Capitalization of costs begins when two criteria are met: (1) the preliminary project stage is completed, and (2) it is probable that the software will be completed and used for its intended function. Capitalization ceases when the software is substantially complete and ready for its intended use, including the completion of all significant testing. Costs related to preliminary project activities and post implementation operating activities are expensed as incurred.

Capitalized costs are included in property and equipment. These costs are amortized over the estimated useful life of the software, which is two years, on a straight-line basis, which represents the manner in which the expected benefit will be derived. The amortization of costs related to the platform applications is included in cost of revenue and sales and marketing expense based on an allocation between paid customer accounts and free customer accounts not generating revenue.

Property and Equipment, Net

Property and equipment, net is stated at cost less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful life of the related asset. Expenses that improve an asset or extend its remaining useful life are capitalized. Costs of maintenance or repairs that do not extend the lives of the respective assets are charged to expenses as incurred.

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. There are no sales commissions earned on renewals. These costs are deferred and then amortized over a period of benefit which is determined to be four years. The Company determined the period of benefit by taking into consideration the length of terms in its customer contracts, life of the technology and other factors. 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 consolidated balance sheets. Deferred contract costs are periodically analyzed for impairment. Amortization expense is included in sales and marketing expenses in the accompanying consolidated statements of operations.

The adoption of ASC 606 related to the deferral of incremental commission costs of obtaining a contract, primarily sales commissions, resulted in a decrease to accumulated deficit of $2.7 million as of January 1, 2017.

The following table represents a rollforward of the Company’s deferred contract costs (in thousands):

	Amount
Balance as of January 1, 2017	$	2,677
Additions to deferred contract costs		3,352
Amortization of deferred contract costs		(1,274	)
Balance as of December 31, 2017	$	4,755
Additions to deferred contract costs		8,925
Amortization of deferred contract costs		(2,671	)
Balance as of December 31, 2018	$	11,009
Additions to deferred contract costs		20,146
Amortization of deferred contract costs		(5,400	)
Balance as of December 31, 2019	$	25,755

Business Combinations

When the Company acquires a business, the purchase consideration is allocated to the tangible assets acquired, liabilities assumed, and intangible assets acquired based on their estimated respective fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require the Company to make significant estimates and assumptions, especially with respect to intangible assets. Significant estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired users, acquired technology, and trade names from a market participant perspective, useful lives and discount rates. The Company’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, the Company may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to other income, net in the consolidated statement of operations.

Accounting for Impairment of Long-Lived Assets (Including Goodwill and Intangibles)

Computers and equipment		3 years
Furnitures and fixtures		5 years
Leasehold improvements		Shorter of lease term or useful life of asset
Capitalized software development costs		2 years
Intangible assets		1-3 years

The Company evaluates long lived assets, including acquired intangible assets and capitalized software development costs, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable or the estimated useful life becomes shorter than originally estimated. Recoverability of assets held and used is measured by comparison of the carrying amount of an asset or an asset group to estimated undiscounted future net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds these estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the assets exceeds the fair value of the asset or asset group, based on discounted cash flows.

Goodwill is not amortized but rather tested for impairment at least annually on October 1, or more frequently if events or changes in circumstances indicate that goodwill may be impaired. Goodwill impairment is recognized when the quantitative assessment results in the carrying value exceeding the fair value, in which case an impairment charge is recorded to the extent the carrying value exceeds the fair value. The Company did not recognize any impairment of goodwill during the years ended December 31, 2019, 2018 or 2017.

Operating Leases

The Company determines if an arrangement is a lease at inception. Operating lease assets and liabilities are reflected within operating lease assets, operating lease liabilities, current, and operating lease liabilities, non-current, on the consolidated balance sheets. For short-term leases (an initial term of 12 months or less), an operating lease asset and corresponding lease liability are not recorded and the Company records rent expense in its consolidated statements of operations on a straight-line basis over the lease term. Operating lease assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company generally uses its incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. The operating lease assets also include any lease payments made and excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components, which are accounted for separately.

Prior to the adoption of ASC 842, Leases on January 1, 2019, the Company recorded the difference between the rent paid and the straight-line rent expense as a deferred rent liability within accrued expenses and other current liabilities and other liabilities.

Deferred Revenue

The Company records contract liabilities to deferred revenue when the Company receives customer payments in advance of the performance obligations being satisfied on the Company’s contracts. Certain of the Company’s customers pay in advance of satisfaction of performance obligations and other customers with monthly contract terms are billed in arrears on a monthly basis.

Revenue recognized during the years ended December 31, 2019, 2018 and 2017, which was included in the deferred revenue balances at the beginning of each respective period, was $71.0 million, $37.1 million, and $9.2 million.

Remaining 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 and does not include usage of our products beyond the contractually committed level. As of December 31, 2019, and December 31, 2018, the aggregate transaction price allocated to remaining performance obligations was $243.8 million and $127.1 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 and more than a majority will be recognized to revenue over the next 12 months.

Net Income (Loss) Per Share Attributable to Common Shareholders

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares of common stock outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares of common stock outstanding during the period giving effect to all potentially dilutive securities to the extent they are dilutive. The dilutive effect of potentially dilutive securities is reflected in diluted net income (loss) per share by application of the two-class method. During the periods when the Company is in a net loss position, the net loss attributable to common stockholders was not allocated to the convertible preferred stock and unvested common stock under the two-class method as these securities do not have a contractual obligation to share in the Company’s losses.

Accounting Pronouncements Recently Adopted

In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740), Balance Sheet Classification of Deferred Tax. ASU No. 2015-17 was issued by the FASB as part of its initiative to reduce complexity in accounting standards (the Simplification Initiative). Current GAAP requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts in a classified statement of financial position. To simplify the presentation of deferred income taxes, the amendments in ASU 2015-17 require that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by the amendments of ASU 2015-17. ASU 2015-17 is effective for financial statements issued for annual periods beginning after December 15, 2017 and interim periods within those annual periods. Early adoption is permitted for financial statements that have not been previously issued. The ASU was adopted January 1, 2019 and applied retrospectively to all deferred tax assets and liabilities for all periods presented. The Company adoption of this ASU had no material impact on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows. The ASU provides guidance on how certain cash receipts and outflows should be classified on entities’ statement of cash flows. The Company adopted the ASU on January 1, 2019 on a retrospective basis to all periods presented. Adoption of this ASU did not have a material impact on the Company’s consolidated statements of cash flows for the periods presented.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows. The standard requires that the statements of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted the ASU on January 1, 2019 on a retrospective basis for all periods presented. As a result of adopting the ASU, the Company includes restricted cash with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts presented on the statement of consolidated cash flows. Accordingly, the statement of cash flows has been revised to include restricted cash as a consolidated component of cash, cash equivalents, and restricted cash.

In February 2016, the FASB issued ASU 2016-02, Leases (ASC 842), which requires, among other items, lessees to recognize most leases as assets and liabilities on the balance sheet. Qualitative and quantitative disclosures are also enhanced to better understand the amount, timing and uncertainty of cash flows arising from leases. The Company adopted this ASU on January 1, 2019 and has elected the transition option prescribed by ASU 2018-11, and accordingly will not restate prior periods under ASC 842. The Company elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the Company to carry forward the historical lease classification and determination of the lease term. Upon adoption, the Company recognized a right of use asset of $47.9 million and a lease liability of $51.4 million with no impact to accumulated deficit or consolidated statement of cash flows.

In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The updated guidance simplifies the accounting for nonemployee share-based payment transactions. The amendments in the new guidance specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The Company adopted this ASU on January 1, 2019 and it had no impact on the Company’s financial statements.

Accounting Pronouncements Not Yet Adopted

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software, which align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this ASU. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company does not expect the adoption of this ASU to have a material effect on the Company’s consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires an entity to utilize a new impairment model known as the current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. This guidance also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. This guidance will be effective for the Company beginning January 1, 2020. The Company does not expect the adoption of this ASU to have a material effect on the Company’s consolidated financial statements.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which aims to reduce complexity in accounting standards by improving certain areas of generally accepted accounting principles (GAAP) without compromising information provided to users of financial statements. This guidance will be effective for the Company beginning January 1, 2021. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements.

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

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

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

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

12. Income Taxes

Income Taxes—For financial reporting purposes, loss before income taxes, includes the following components (in thousands):

	December 31,
	2019			2018			2017
Domestic	$	(18,330	)	$	(11,273	)	$	(2,498	)
Foreign		2,354			1,033			385
Loss before income taxes	$	(15,976	)	$	(10,240	)	$	(2,113	)

Total income taxes allocated to operations for the years ended December 31, 2019, 2018 and 2017 were as follows (in thousands):

2019	Current		Deferred			Total
Federal	$	—	$	—		$	—
State		126		—			126
Foreign		967		(359	)		608
Total	$	1,093	$	(359	)	$	734

2018	Current			Deferred		Total
Federal	$	—		$	—	$	—
State		(127	)		—		(127	)
Foreign		559			90		649
Total	$	432		$	90	$	522

2017	Current		Deferred			Total
Federal	$	41	$	—		$	41
State		60		—			60
Foreign		477		(121	)		356
Total	$	578	$	(121	)	$	457

Tax Rate Reconciliation—Income tax expense was $0.7 million, $0.5 million and $0.5 million for the years ended December 31, 2019, 2018 and 2017, respectively, and differed from the amounts computed by applying the U.S. federal statutory income tax rate of 21%, 21% and 34% for the years ended December 31, 2019, 2018 and 2017, respectively, to pretax loss from operations as a result of the following (in thousands):

	December 31,
	2019			2018			2017
Income tax expense at federal statutory rate	$	(3,355	)	$	(2,151	)	$	(719	)
Nondeductible expenses		(1,049	)		1,289			735
State taxes (net of federal benefit)		100			(100	)		60
Impacts of United States tax reform—rate change and mandatory repatriation		—			—			4,353
Change in valuation allowance		5,043			1,052			(4,146	)
Uncertain tax positions		23			241			366
Foreign taxes		92			191			(146	)
Other		(120	)		—			(46	)
Total	$	734		$	522		$	457

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code that affected the Company’s financial results for the year ended December 31, 2017, including, but not limited to: (1) requiring a one-time transition tax (payable over eight years) on certain un-repatriated earnings of foreign subsidiaries; (2) a future reduction of the U.S. federal corporate tax rate from 34% to 21% effective January 1, 2018, that reduced the current value of the Company’s deferred tax assets and liabilities; and (3) bonus depreciation that allows for full expensing of qualified property placed in service after September 27, 2017. In addition, the Tax Act establishes new tax laws that may affect the Company’s financial results for the years ending after December 31, 2017, including, but not limited to: (1) a reduction of the U.S. federal income tax rate from 34% to 21%; (2) limitation of the deduction for interest expense; (3) a general elimination of U.S. federal income taxes on dividends from foreign subsidiaries; (4) a new provision designed to tax global intangible low-taxed income; (5) limitations on the deductibility of certain executive compensation; and (6) limitations on the use of Foreign Income Tax Credit to reduce the Company’s income tax liability.

Pursuant to the Staff Accounting Bulletin published by the SEC on December 22, 2017, addressing the challenges in accounting for the effects of the Tax Act in the period of enactment, companies reported provisional amounts for those specific income tax effects of the Tax Act for which the accounting was incomplete but a reasonable estimate could be determined. Those provisional amounts were subject to adjustment during a measurement period of up to one year from the enactment date (a “measurement-period adjustment”). Pursuant to this guidance, the estimated impact of the Tax Act was based on a preliminary review of the new tax law and projected future financial results and was subject to revision based upon further analysis and interpretation of the Tax Act and to the extent that actual results differed from projections available at that time.

In 2018, the Company completed its accounting with respect to the Tax Act and did not make any measurement-period adjustments to the initial tax expense of $4.0 million recorded in 2017. The accounting is summarized below:

•

Reduction of U.S. Federal Corporate Tax Rate: The Tax Act reduced the corporate tax rate to 21%, effective January 1, 2018. Consequently, the Company recorded a decrease related to deferred tax assets and liabilities with a corresponding net adjustment to deferred income tax expense for the year ended December 31, 2017 of $4.0 million. In addition, the valuation allowance was reduced by $4.0 million, as the Company is in a full valuation allowance position for the U.S. Deferred Tax Asset position. The Company did not make any measurement-period adjustments related to this item in 2018. The Company’s accounting for this element of the Tax Act is complete.

•

One-Time Mandatory Deemed Repatriation Tax: The one-time mandatory deemed repatriation tax is imposed on previously untaxed accumulated and current earnings and profits of the Company’s foreign subsidiaries. The Company was able to reasonably estimate the one-time mandatory deemed repatriation tax and recorded an initial provisional tax obligation, with a corresponding adjustment to income tax expense for the year ended December 31, 2017, which did not have a material impact. The Company did not make any measurement-period adjustments related to this item in 2018. The Company’s accounting for this element of the Tax Act is complete.

•

Valuation Allowances: The Company must assess whether its valuation allowance analyses are affected by the various aspects of the Tax Act. During 2017, the Company released $4.0 million of valuation allowance corresponding with the reduction of the associated U.S. deferred tax assets. The Company did not make any measurement-period adjustments related to this item in 2018. The Company’s accounting for this element of the Tax Act is complete.

•

Global Intangible Low-Taxed Income (GILTI) Policy Election: The FASB allows companies to adopt an accounting policy to either recognize deferred tax for GILTI or treat such tax cost as a current period expense when incurred. The Company has adopted an accounting policy to treat taxes due on GILTI as a current period expense.

Components of Deferred Taxes—The tax effects of temporary differences that give rise to the deferred tax assets and deferred tax liabilities at December 31, 2019 and 2018 are presented below (in thousands):

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

The Company accounts for income taxes using an asset and liability method and deferred income tax assets and liabilities are measured using the currently enacted tax rates that apply to taxable income in effect for the years in which those tax assets and liabilities are expected to be realized or settled. The Company’s deferred tax assets and liabilities are comprised primarily of federal and state net operating loss carryforwards and basis differences for financial reporting and tax purposes of certain assets and liabilities. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Based upon the weight of all available evidence, which includes the historical operating performance and the recorded cumulative losses in prior fiscal periods, management does not believe as of December 31, 2019 and 2018 that it is more likely than not that the Company will realize its deferred tax assets. As a result, a valuation allowance of $15.2 million and $9.7 million has been provided at December 31, 2019 and 2018, respectively. The valuation allowance changed by $5.5 million and $1.2 million at December 31, 2019 and 2018, respectively. At December 31, 2019 and 2018, the Company has net operating loss carryforwards for federal tax purposes of approximately $56.6 million and $28.0 million, respectively, which is available to offset federal taxable income. The federal net operating loss carryforwards generated at December 31, 2019 and prior will begin to expire in 2031, if not utilized. Net operating losses generated at December 31, 2018 and after have an indefinite carryforward period but are subject to an 80% of taxable income limitation. The Company has approximately $42.0 million and $24.2 million of post-apportioned net operating loss carryforwards as of December 31, 2019 and 2018, respectively for various state tax purposes. The state net operating loss carryforwards will begin to expire in 2029, if not utilized.

Utilization of the net operating losses may be subject to an annual limitation provided for in the Internal Revenue Code of 1986, as amended, under Section 382 and similar state codes. The Company has prepared an analysis to determine whether its net operating losses may be limited under such provisions. It has been determined that any annual limitation would not result in the expiration of net operating loss carryforwards before utilization.

In general, it is the practice and intention of the Company to reinvest the earnings of its non-U.S. subsidiaries in those operations. Historically, the Company has not made a provision for U.S. income tax with respect to accumulated earnings of foreign subsidiaries where the foreign investment of such earnings is essentially permanent in duration. Generally, such amounts would become subject to U.S. taxation upon the remittance of dividends and under certain other circumstances. The Company has not provided U.S. taxes on unremitted earnings of its foreign subsidiaries as it asserts permanent reinvestment on any accumulated earnings and profits.

Consistent with the provisions of ASC 740, Income Taxes, the Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs.

The following table shows the changes in the gross amount of unrecognized tax benefits as of December 31, 2019, 2018 and 2017 (in thousands):

	December 31,
	2019		2018		2017
Beginning balance	$	920	$	563	$	—
Increases based on tax positions during the current period		—		357		563
Ending balance	$	920	$	920	$	563

The total amount of unrecognized tax benefits that, if recognized would impact the effective tax rate would be $0.5 million and $0.8 million for the years ended December 31, 2019 and 2018, respectively.

The Company’s policy for classifying interest and penalties associated with unrecognized income tax benefits is to include such items in income tax expense. The total amount of interest and penalties associated with unrecognized income tax benefits is $0.4 million and $0.4 million for the years ended December 31, 2019 and 2018, respectively.

Although it is reasonably possible that certain unrecognized tax benefits may increase or decrease within the next 12 months due to tax examination changes, settlement activities, expirations of statute of limitations, or the impact on recognition and measurement considerations related to the results of published tax cases or other similar activities, the Company does not anticipated any significant changes to unrecognized tax benefits over the next 12 months.

The Company files income tax returns in the U.S. federal jurisdiction, various state jurisdictions and in various international jurisdictions. Tax years 2014 and forward generally remain open for examination for federal and state tax purposes. The Company is currently under audit in the U.S., a major tax jurisdiction, for the 2017 tax year. To the extent utilized in future years’ tax returns, net operating loss carryforwards at December 31, 2019 and 2018 will remain subject to examination until the respective tax year is closed.

Stockholders' Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	Sep. 18, 2019 $ / shares shares	Nov. 30, 2019 shares	Mar. 31, 2019 $ / shares	Jun. 30, 2019 shares	Dec. 31, 2019 USD ($) Vote $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 23, 2019 shares	Sep. 06, 2019 shares	Dec. 31, 2016 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capital stock purchase price per share \| $ / shares			$ 15.92
Aggregate shares of capital stock				14,366,871
Conversion of preferred stock				803,481
Common stock, shares authorized					0	380,000,000		2,330,000,000	380,000,000
Common stock, par value \| $ / shares					$ 0.00001	$ 0.00001
Common stock, shares issued					0	78,180,606
Common stock, shares outstanding					0	78,180,606
Number of voting rights entitled to stockholders per share					Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share.
Share-based payment arrangement, expense \| $					$ 19,034	$ 5,244	$ 3,068
Stock issuable upon the exercise of options outstanding					36,384,767	38,865,057	44,877,888			35,825,160
Proceeds from exercise of stock options \| $					$ 7,899	$ 7,782	$ 462
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation cost related to unvested awards not yet recognized \| $					$ 90,500	$ 28,400
Weighted average period over compensation cost related to unvested employee awards					2 years 8 months 12 days	3 years 4 months 24 days
Stock based compensation award vesting period					4 years
Weighted average grant-date fair value of options granted \| $ / shares					$ 8.69	$ 2.48	$ 0.40
Proceeds from exercise of stock options \| $					$ 7,900	$ 7,800	$ 500
Intrinsic value of options exercised \| $					121,300	36,400	1,500
Aggregate fair value of options vested \| $					$ 10,800	$ 3,500	$ 4,200
Early exercise of common stock					1,239,750	2,095,656
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period over compensation cost related to unvested employee awards					3 years 10 months 24 days
Common stock granted					647,094
Total compensation cost related to unvested awards not yet recognized \| $					$ 30,400
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of options granted \| $ / shares					$ 38.21	$ 5.63	$ 1.02
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of options granted \| $ / shares					$ 6.16	$ 2.23	$ 0.87
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial offering period					The initial offering period began on September 18, 2019 and will end on May 15, 2020.
Percentage of purchase the shares at a price per share	85.00%
Share-based payment arrangement, expense \| $					$ 1,200
Total compensation cost related to unvested awards not yet recognized \| $					$ 1,500
Weighted average period over compensation cost related to unvested employee awards					4 months 24 days
Amounts withheld on behalf of employees for a future purchase \| $					$ 3,300
2019 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to grant award					70,296,733
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized					2,000,000,000	0		2,000,000,000
Common stock, par value \| $ / shares					$ 0.00001	$ 0.00001
Common stock, shares issued					64,308,498	0
Common stock, shares outstanding					64,308,498	0
Number of voting rights entitled to stockholders per share \| Vote					1
Stock issuable upon the exercise of options outstanding					20,700
Class A Common Stock \| Service-based Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation award vesting period		4 years
Common stock granted		244,445
Class A Common Stock \| Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant					6,725,000
Class A Common Stock \| Employee Stock Purchase Plan \| Initial Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Initial public offering price \| $ / shares	$ 27.00
Class A Common Stock \| Employee Stock Purchase Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to grant award	6,725,000
Class A Common Stock \| 2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant					31,729,237
Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized					310,000,000	0		310,000,000
Common stock, par value \| $ / shares					$ 0.00001	$ 0.00001
Common stock, shares issued					232,078,452	0
Common stock, shares outstanding					232,078,452	0
Convertible preferred stock converted into common stock								179,011,431
Number of voting rights entitled to stockholders per share \| Vote					10
Common stock, number of shares converted					36,464,053
Stock issuable upon the exercise of options outstanding					36,364,067
Class B Common Stock \| Initial Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Convertible preferred stock converted into common stock								179,011,431
Class B Common Stock \| 2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of preferred stock					36,364,067

Acquisition, Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Intangibles, Net

Intangibles, net consisted of the following (in thousands):

December 31, 2019

Gross

Carrying

Amount

Accumulated

Amortization

Net

Carrying

Amount

Amortization

Period

Developed technology

3,046

(1,611

)

1,435

2-3 years

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Amortization Period
Developed technology	$	2,125	$	(837	)	$	1,288	2-3 years
Customer relationships		20		(20	)		—	1 year
Total	$	2,145	$	(857	)	$	1,288

Schedule of Future Amortization Expense

As of December 31, 2019, future amortization expense by year is expected to be as follows (in thousands):

	Amount
2020	$	675
2021		501
2022		259
Total	$	1,435

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, 2017	$	6,292
Madumbo acquisition		1,334
Balance as of December 31, 2018	$	7,626
2019 acquisition		1,285
Foreign currency translation adjustments		147
Balance as of December 31, 2019	$	9,058

2019 Acquisition

Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities

The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands):

	Fair Value
Fair value of net assets acquired:
Net tangible assets	$	9
Software technology		910
Goodwill		1,285
Total fair value of net assets acquired	$	2,204

Madumbo

Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities

The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands):

	Fair Value
Fair value of net assets acquired:
Net tangible assets (liabilities)	$	(536	)
Developed technology		825
Goodwill		1,334
Total fair value of net assets acquired	$	1,623

Focusmatic Acquisition

Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities

The aggregate purchase consideration and estimated fair values of the assets acquired and liabilities assumed at the date of acquisition were as follows (in thousands):

	Fair Value
Fair value of purchase consideration:
Cash consideration	$	5,397
Common stock		2,015
Total fair value of net assets acquired	$	7,412

	Fair Value
Fair value of net assets acquired:
Net tangible assets (liabilities)	$	(200	)
Developed technology		1,300
Customer relationships		20
Goodwill		6,292
Total fair value of net assets acquired	$	7,412

Basis of Presentation and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

2. Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Principles of Consolidation

The consolidated financial statements include the accounts of Datadog, Inc. and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

Initial Public Offering

The Company incurred $2.0 million of net offering costs in connection with the IPO which were recorded as an offset against IPO proceeds.

Stock Split and Authorized Shares

Segment Information

Use of Estimates

Foreign Currency Translation

Revenue Recognition

The Company accounts for revenue contracts with customers through the following steps:

(1)

identify the contract with a customer;

(2)

identify the performance obligations in the contract;

(3)

determine the transaction price;

(4)

allocate the transaction price; and

(5)

recognize revenue when or as the Company satisfies a performance obligation.

The Company applied the practical expedient in Topic 606 and did not evaluate contracts of one year or less for the existence of a significant financing component.

Cost of Revenue

Research and Development Costs

Sales and Marketing Costs

Advertising Costs

Income Taxes

Stock-Based Compensation

Cash and Cash Equivalents

Marketable Securities

Restricted Cash

Concentration of Credit Risk

Geographical Information

Revenue by location is determined by the billing address for the customer. The following table sets forth revenue by geographic area (in thousands):

	Year Ended December 31,
	2019		2018		2017
North America	$	272,190	$	150,945	$	76,352
International		90,590		47,132		24,409
Total	$	362,780	$	198,077	$	100,761

Fair Value of Financial Instruments

Level 1 Inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date.

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

Accounts Receivable

Internal Use Software Development Costs

Property and Equipment, Net

Deferred Contract Costs

The following table represents a rollforward of the Company’s deferred contract costs (in thousands):

	Amount
Balance as of January 1, 2017	$	2,677
Additions to deferred contract costs		3,352
Amortization of deferred contract costs		(1,274	)
Balance as of December 31, 2017	$	4,755
Additions to deferred contract costs		8,925
Amortization of deferred contract costs		(2,671	)
Balance as of December 31, 2018	$	11,009
Additions to deferred contract costs		20,146
Amortization of deferred contract costs		(5,400	)
Balance as of December 31, 2019	$	25,755

Business Combinations

Accounting for Impairment of Long-Lived Assets (Including Goodwill and Intangibles)

Computers and equipment		3 years
Furnitures and fixtures		5 years
Leasehold improvements		Shorter of lease term or useful life of asset
Capitalized software development costs		2 years
Intangible assets		1-3 years

Operating Leases

Deferred Revenue

Net Income (Loss) Per Share Attributable to Common Shareholders

Accounting Pronouncements Recently Adopted

Accounting Pronouncements Not Yet Adopted

Fair Value Measurements

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. Fair Value Measurements

	Fair Value Measurement as of December 31, 2019
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash equivalents:
Money market funds	$	588,762	$	—	$	—	$	588,762
Marketable Securities:
Corporate debt securities		—		80,417		—		80,417
U.S. government treasury securities		—		72,473		—		72,473
Commercial paper		—		23,784		—		23,784
Total financial assets	$	588,762	$	176,674	$	—	$	765,436

	Fair Value Measurement as of December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial Assets:
Cash equivalents:
Money market funds	$	47,187	$	—	$	—	$	47,187
Total financial assets	$	47,187	$	—	$	—	$	47,187

The Company classifies its highly liquid money market funds within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. The Company classifies its commercial paper, corporate debt securities, and U.S. government treasury securities within Level 2 because they are valued using inputs other than quoted prices that are directly or indirectly observable in the market, including readily available pricing sources for the identical underlying security which may not be actively traded.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

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

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

Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Payables And Accruals [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31, 2019		December 31, 2018
Accrued compensation and commissions	$	21,910	$	15,229
Accrued expenses		12,692		6,940
Early exercise liability-stock options		1,776		2,931
Payroll and sales taxes		1,626		1,147
Other tax liability		742		516
Deferred rent		—		3,527
Total accrued expenses and other current liabilities	$	38,746	$	30,290

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

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Components of Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

	December 31, 2019			December 31, 2018
Computers and equipment	$	7,536		$	4,540
Furniture and fixtures		4,804			2,621
Leasehold improvements		16,517			8,554
Capitalized software development costs		24,630			15,000
Total property and equipment	$	53,487		$	30,715
Less: accumulated depreciation and amortization		(20,738	)		(9,066	)
Total property and equipment, net	$	32,749		$	21,649

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

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

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Components of Loss before Income Taxes

Income Taxes—For financial reporting purposes, loss before income taxes, includes the following components (in thousands):

	December 31,
	2019			2018			2017
Domestic	$	(18,330	)	$	(11,273	)	$	(2,498	)
Foreign		2,354			1,033			385
Loss before income taxes	$	(15,976	)	$	(10,240	)	$	(2,113	)

Summary of Income Taxes Allocated to Operations

Total income taxes allocated to operations for the years ended December 31, 2019, 2018 and 2017 were as follows (in thousands):

2019	Current		Deferred			Total
Federal	$	—	$	—		$	—
State		126		—			126
Foreign		967		(359	)		608
Total	$	1,093	$	(359	)	$	734

2018	Current			Deferred		Total
Federal	$	—		$	—	$	—
State		(127	)		—		(127	)
Foreign		559			90		649
Total	$	432		$	90	$	522

2017	Current		Deferred			Total
Federal	$	41	$	—		$	41
State		60		—			60
Foreign		477		(121	)		356
Total	$	578	$	(121	)	$	457

Summary of Tax Rate Reconciliation

	December 31,
	2019			2018			2017
Income tax expense at federal statutory rate	$	(3,355	)	$	(2,151	)	$	(719	)
Nondeductible expenses		(1,049	)		1,289			735
State taxes (net of federal benefit)		100			(100	)		60
Impacts of United States tax reform—rate change and mandatory repatriation		—			—			4,353
Change in valuation allowance		5,043			1,052			(4,146	)
Uncertain tax positions		23			241			366
Foreign taxes		92			191			(146	)
Other		(120	)		—			(46	)
Total	$	734		$	522		$	457

Components of Deferred Tax Assets and Liabilities

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

Summary of Changes in Gross Amount of Unrecognized Tax Benefits

The following table shows the changes in the gross amount of unrecognized tax benefits as of December 31, 2019, 2018 and 2017 (in thousands):

	December 31,
	2019		2018		2017
Beginning balance	$	920	$	563	$	—
Increases based on tax positions during the current period		—		357		563
Ending balance	$	920	$	920	$	563

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

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

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

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

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

Marketable Securities

12 Months Ended

Dec. 31, 2019

Investments Debt And Equity Securities [Abstract]

Marketable Securities

3. Marketable Securities

	Amortized Cost		Unrealized Gain		Unrealized Losses			Fair Value
Commercial debt securities	$	80,376	$	46	$	(5	)	$	80,417
U.S. government treasury securities		72,467		10		(4	)		72,473
Commercial paper		23,784		—		—			23,784
Marketable securities	$	176,627	$	56	$	(9	)	$	176,674

As of December 31, 2019, the fair values of available-for-sale marketable securities, by remaining contractual maturity, were as follows (in thousands):

Due within one year	$	97,816
Due in one year through five years		78,858
Total	$	176,674

The Company does not believe that any unrealized losses represent other-than-temporary impairments based on its evaluation of available evidence. To determine whether a decline in value is other-than-temporary, the Company evaluates, among other factors: the duration and extent to which the fair value has been less than the carrying value and its intent and ability to retain the marketable securities for a period of time sufficient to allow for any anticipated recovery in fair value.

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

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

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

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Summary of Components of Lease Cost Recognized

The components of lease cost recognized within the Company’s consolidated statements of operations and comprehensive loss were as follows (in thousands):

	Year Ended December 31, 2019
Operating lease cost⁽¹⁾	$	13,636
Variable lease cost⁽²⁾		94
Short-term lease cost		2,925

1)	Includes non-cash lease expense of $10.4 million

2)	Primarily related to Consumer Price Index adjustments, common area maintenance and property tax.

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):

Year Ended

December 31, 2019

Cash paid for amounts included in measurement of lease liabilities

9,767

Operating lease assets obtained in exchange for new lease liabilities

14,618

Summary of Maturities of Lease Liabilities

Maturities of lease liabilities by fiscal year for the Company’s operating leases are as follows (in thousands):

	Amount
2020	$	14,576
2021		16,944
2022		16,731
2023		14,569
2024 and beyond		4,017
Total lease payments	$	66,837
Less: imputed interest		(6,411	)
Present value of lease liabilities	$	60,426

Summary of Weighted Average Remaining Lease Term and Discount Rate

Weighted average remaining lease term and discount rate for the Company’s operating leases are as follows:

December 31,

2019

Weighted average remaining lease term (years)

4.00

Weighted average discount rate

4.98

Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2019

Prepaid Expense And Other Assets Current [Abstract]

Prepaid Expenses and Other Current Assets

5. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	December 31, 2019		December 31, 2018
Hosting	$	9,180	$	3,356
General prepaid expenses		5,700		3,607
Other receivables		2,578		526
Rent		821		1,066
Marketing		516		218
Restricted cash		436		—
Total prepaid expenses and other current assets	$	19,231	$	8,773

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

Subsequent Events - Additional Information (Detail) - Azure Agreement - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Purchase commitment period		3 years
Subsequent Event \| Minimum
Subsequent Event [Line Items]
Purchase of cloud services	$ 21.0

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