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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Nov. 06, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
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 Shell Company	false
Entity Current Reporting Status	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
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		27,600,000
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		268,230,402

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 760,945	$ 53,639
Accounts receivable, net of allowance for doubtful accounts of $516 and $477 as of September 30, 2019 and December 31, 2018, respectively	87,208	55,822
Deferred contract costs, current	6,151	3,717
Prepaid expenses and other current assets	18,172	8,773
Total current assets	872,476	121,951
Property and equipment, net	31,266	21,649
Operating lease assets	55,695
Goodwill	7,626	7,626
Intangible assets, net	759	1,288
Deferred contract costs, non-current	12,064	7,292
Restricted cash	9,507	11,341
Other assets	17,360	8,603
TOTAL ASSETS	1,006,753	179,750
CURRENT LIABILITIES:
Accounts payable	18,992	12,638
Accrued expenses and other current liabilities	30,481	30,290
Operating lease liabilities, current	10,222
Deferred revenue, current	116,966	69,306
Total current liabilities	176,661	112,234
Operating lease liabilities, non-current	51,684
Deferred revenue, non-current	4,827	1,393
Other liabilities	2,346	1,359
Total liabilities	235,518	114,986
COMMITMENTS AND CONTINGENCIES (NOTE 7)
CONVERTIBLE PREFERRED STOCK:
Convertible preferred stock; $0.00001 par value per share; 0 and 179,814,912 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 0 and 179,814,912 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively		140,805
STOCKHOLDERS' EQUITY (DEFICIT):
Preferred stock; $0.00001 par value per share; 20,000,000 and 0 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 0 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively
Additional paid-in capital	895,793	30,834
Accumulated other comprehensive (loss) income	(54)	31
Accumulated deficit	(124,507)	(106,906)
Total stockholders’ equity (deficit)	771,235	(76,041)
TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)	1,006,753	$ 179,750
Class B Common Stock
STOCKHOLDERS' EQUITY (DEFICIT):
Common stock, value	$ 3

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts receivable, net of allowance for doubtful accounts	$ 516	$ 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	27,600,000	0
Common stock, shares outstanding	27,600,000	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	268,113,075	0
Common stock, shares outstanding	268,113,075	0

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 95,864	$ 51,074	$ 249,136	$ 136,467
Cost of revenue	23,297	12,098	63,225	30,690
Gross profit	72,567	38,976	185,911	105,777
Operating expenses:
Research and development	28,684	14,159	75,531	37,456
Sales and marketing	38,836	25,130	105,061	59,747
General and administrative	9,265	4,322	23,193	12,933
Total operating expenses	76,785	43,611	203,785	110,136
Operating loss	(4,218)	(4,635)	(17,874)	(4,359)
Other income, net	90	311	646	612
Loss before provision for income taxes	(4,128)	(4,324)	(17,228)	(3,747)
Provision for income taxes	(33)	(349)	(373)	(428)
Net loss	(4,161)	(4,673)	(17,601)	(4,175)
Other comprehensive (loss) income—foreign currency translation adjustments	(45)	(10)	(85)	32
Comprehensive loss	(4,206)	(4,683)	(17,686)	(4,143)
Net loss attributable to common stockholders	$ (4,161)	$ (4,673)	$ (17,601)	$ (4,175)
Basic and diluted net loss per share	$ (0.04)	$ (0.06)	$ (0.20)	$ (0.06)
Weighted average shares used in calculating basic and diluted net loss per share:	103,876	73,353	87,758	69,708

CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	Initial Public Offering	Third-Party Tender Offer	Convertible Preferred Stock	Convertible Preferred Stock Initial Public Offering	Convertible Preferred Stock Third-Party Tender Offer	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 Initial Public Offering	Additional Paid-in Capital Third-Party Tender Offer	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Convertible preferred stock, beginning balance, shares at Dec. 31, 2017				179,814,912
Convertible preferred stock, beginning balance at Dec. 31, 2017				$ 140,805
Beginning balance, shares at Dec. 31, 2017									1,137,000	62,160,984
Beginning balance at Dec. 31, 2017	$ (75,701)											$ 20,491			$ (48)	$ (96,144)
Issuance of common stock upon exercise of stock options, shares										12,862,488
Issuance of common stock upon exercise of stock options	3,608											3,608
Vesting of early exercised stock options	277											277
Stock-based compensation	3,187											3,187
Conversion of non-voting common stock, shares									(1,137,000)	1,137,000
Change in accumulated other comprehensive (loss) income	32														32
Net loss	(4,175)															(4,175)
Convertible preferred stock, ending balance, shares at Sep. 30, 2018				179,814,912
Convertible preferred stock, ending balance at Sep. 30, 2018				$ 140,805
Ending balance, shares at Sep. 30, 2018										76,160,472
Ending balance at Sep. 30, 2018	(72,772)											27,563			(16)	(100,319)
Convertible preferred stock, beginning balance, shares at Jun. 30, 2018				179,814,912
Convertible preferred stock, beginning balance at Jun. 30, 2018				$ 140,805
Beginning balance, shares at Jun. 30, 2018										73,587,747
Beginning balance at Jun. 30, 2018	(70,000)											25,652			(6)	(95,646)
Issuance of common stock upon exercise of stock options, shares										2,572,725
Issuance of common stock upon exercise of stock options	433											433
Vesting of early exercised stock options	109											109
Stock-based compensation	1,369											1,369
Change in accumulated other comprehensive (loss) income	(10)														(10)
Net loss	(4,673)															(4,673)
Convertible preferred stock, ending balance, shares at Sep. 30, 2018				179,814,912
Convertible preferred stock, ending balance at Sep. 30, 2018				$ 140,805
Ending balance, shares at Sep. 30, 2018										76,160,472
Ending balance at Sep. 30, 2018	(72,772)											27,563			(16)	(100,319)
Convertible preferred stock, beginning balance, shares at Dec. 31, 2018				179,814,912
Convertible preferred stock, beginning balance at Dec. 31, 2018	140,805			$ 140,805
Beginning balance, shares at Dec. 31, 2018										78,180,606
Beginning balance at Dec. 31, 2018	$ (76,041)											30,834			31	(106,906)
Issuance of common stock upon exercise of stock options, shares	10,114,941									10,117,557
Issuance of common stock upon exercise of stock options	$ 6,576											6,576
Vesting of early exercised stock options	1,490											1,490
Stock-based compensation	10,153											10,153
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	705,938						$ 1					705,937
Conversion of convertible preferred stock to common stock, shares					(179,011,431)	(803,481)		179,011,431			803,481
Conversion of convertible preferred stock to common stock		$ 140,752	$ 53		$ (140,752)	$ (53)		$ 2					$ 140,750	$ 53
Change in accumulated other comprehensive (loss) income	(85)														(85)
Reclassification of common stock to class A and class B common stock, shares							89,101,644			(89,101,644)
Net loss	(17,601)															(17,601)
Convertible preferred stock, ending balance, shares at Sep. 30, 2019				0
Ending balance, shares at Sep. 30, 2019							295,713,075
Ending balance at Sep. 30, 2019	771,235						$ 3					895,793			(54)	(124,507)
Convertible preferred stock, beginning balance, shares at Jun. 30, 2019				179,011,431
Convertible preferred stock, beginning balance at Jun. 30, 2019				$ 140,752
Beginning balance, shares at Jun. 30, 2019										86,823,234
Beginning balance at Jun. 30, 2019	(79,223)											41,132			(9)	(120,346)
Issuance of common stock upon exercise of stock options, shares										2,278,410
Issuance of common stock upon exercise of stock options	2,106											2,106
Vesting of early exercised stock options	1,177											1,177
Stock-based compensation	4,691											4,691
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	705,938						$ 1					705,937
Conversion of convertible preferred stock to common stock, shares					(179,011,431)			179,011,431
Conversion of convertible preferred stock to common stock		$ 140,752			$ (140,752)			$ 2					$ 140,750
Change in accumulated other comprehensive (loss) income	(45)														(45)
Reclassification of common stock to class A and class B common stock, shares							89,101,644			(89,101,644)
Net loss	(4,161)															(4,161)
Convertible preferred stock, ending balance, shares at Sep. 30, 2019				0
Ending balance, shares at Sep. 30, 2019							295,713,075
Ending balance at Sep. 30, 2019	$ 771,235						$ 3					$ 895,793			$ (54)	$ (124,507)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (17,601)	$ (4,175)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	8,776	4,239
Amortization of deferred contract costs	3,688	1,806
Stock-based compensation, net of amounts capitalized	10,016	3,051
Noncash lease expense	8,403
Provision for accounts receivable allowance	835	285
Loss (gain) on disposal of property and equipment	442	(1)
Changes in operating assets and liabilities:
Accounts receivable, net	(32,224)	(8,577)
Deferred contract costs	(10,894)	(6,045)
Prepaid expenses and other current assets	(9,476)	(746)
Other assets	(8,480)	(4,939)
Accounts payable	4,213	4,814
Accrued expenses and other liabilities	(1,990)	6,320
Deferred revenue	51,096	19,352
Net cash provided by operating activities	6,804	15,384
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(9,813)	(8,205)
Capitalized software development costs	(7,058)	(4,540)
Cash paid for acquisition of businesses; net of cash acquired		(1,618)
Net cash used in investing activities	(16,871)	(14,363)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	7,306	6,833
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs	708,659
Net cash provided by financing activities	715,965	6,833
Effect of exchange rate changes on cash and cash equivalents	49	13
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	705,947	7,867
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	64,980	63,778
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	770,927	71,645
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	97	4
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued property and equipment purchases	1,574	70
Stock-based compensation included in capitalized software development costs	137	136
Vesting of early exercised options	1,490	277
Costs related to initial public offering included in accounts payable and accrued liabilities	2,721
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	760,945	64,003
Restricted cash – Including amounts in prepaid expense and other current assets and other assets	$ 9,982	$ 7,642
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List]	ddog:PrepaidExpenseOtherCurrentAssetsAndOtherAssets	ddog:PrepaidExpenseOtherCurrentAssetsAndOtherAssets
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	$ 770,927	$ 71,645

Organization and Description of Business

9 Months Ended

Sep. 30, 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.

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.

Prior to the IPO, deferred offering costs, which consist of direct incremental legal, accounting, and consulting fees relating to the IPO, were capitalized in prepaid expenses and other current assets in the condensed consolidated balance sheets. Upon the consummation of the IPO, $2.0 million of net deferred offering costs were reclassified into stockholders’ equity as an offset against IPO proceeds.

Basis of Presentation and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 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 condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Principles of Consolidation

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

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 3-for-1 stock split, 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 condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Such estimates include 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 including the determination of the fair value of the Company’s stock, valuation of long-lived assets and their recoverability, including goodwill, estimated expected period of benefit for deferred contract costs, the incremental borrowing rate for operating leases, 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.

Unaudited Interim Condensed Consolidated Financial Information

The unaudited condensed consolidated financial statements include the accounts of Datadog Inc. and its wholly owned subsidiaries, and have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and following the requirements of the Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by GAAP can be condensed or omitted. These financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for the fair statement of the Company’s financial information. These interim results are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2019 or for any other interim period or for any other future year. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the fiscal year ended December 31, 2018 contained in the Company’s final prospectus for its IPO dated as of September 18, 2019 and filed with the SEC pursuant to Rule 424(b)(4) on September 19, 2019 (the “Final Prospectus”).

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 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 condensed consolidated statements of operations and comprehensive loss 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 condensed 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, 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.

Advertising Costs

Advertising costs are expensed as incurred and were approximately $2.7 million and $7.3 million for the three and nine months ended September 30, 2019, respectively, and $2.3 million and $6.0 million for the three and nine months ended September 30, 2018, respectively, and are included in sales and marketing expense in the accompanying condensed consolidated statement of operations and comprehensive loss.

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 measures compensation expense for all stock-based payment awards, including stock options granted to employees, directors, and nonemployees, based on the estimated 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. Stock-based compensation is recognized on a straight-line basis over the requisite service period. 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.

Prior to the IPO, the fair value of common stock underlying the stock options had historically been determined by the Board of Directors, with input from the Company’s management. The Board of Directors previously determined the fair value of the common stock at the time of grant of the options by considering a number of objective and subjective factors, including valuations of comparable companies, sales of common stock to unrelated third parties, operating and financial performance, the lack of liquidity of the Company’s capital stock, and general and industry-specific economic outlook. Subsequent to the 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 Select Market.

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.

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 and accounts receivable. For cash and cash equivalents, the Company is exposed to credit risk in the event of default by the financial institutions to the extent of the amounts recorded on the accompanying condensed consolidated balance sheets exceed federally insured limits. The Company places its cash and cash equivalents with financial institutions with high-quality credit ratings and has not experienced any losses in such accounts. 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 condensed consolidated balance sheets.

There were no customers representing greater than 10% of total revenue for the three and nine months ended September 30, 2019 or 2018. No customers represented greater than 10% of accounts receivable as of September 30, 2019 or December 31, 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):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
North America	$	70,904	$	38,791	$	186,340	$	101,976
International		24,960		12,283		62,796		34,491
Total	$	95,864	$	51,074	$	249,136	$	136,467

As of September 30, 2019, 72% of the Company’s long-lived assets were located in North America and 28% were located outside of North America. As of December 31, 2018, 85% of the Company’s long-lived assets were located in North America and 15% were located outside of North America, 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.

Included in the Company’s cash and cash equivalents are money market funds, which are classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices. As of September 30, 2019, and December 31, 2018, the Company had $760.9 million and $53.6 million, respectively, of cash and cash equivalents primarily invested in money market funds. In addition, the Company had $10.0 million and $11.3 million, respectively, of restricted cash in connection with collateral for various lease agreements for the Company’s facilities. 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.

Unbilled accounts receivable represents revenue recognized on contracts for which billings have not yet been presented to customers because the amounts were earned but not contractually billable as of the balance sheet date. The unbilled accounts receivable balance is due within one year. As of September 30, 2019, and December 31, 2018, unbilled accounts receivable of approximately $13.1 million and $13.1 million, respectively, was included in accounts receivable on the Company’s condensed 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. 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 condensed consolidated balance sheets. Deferred contract costs are periodically analyzed for impairment. Amortization expense is included in sales and marketing expenses in the accompanying condensed consolidated statements of operations.

Deferred contract costs on the Company’s condensed consolidated balance sheets were $18.2 million and $11.0 million as of September 30, 2019 and December 31, 2018, respectively. Amortization expense was $1.4 million and $0.7 million for the three months ended September 30, 2019 and 2018, respectively, and was $3.7 million and $1.8 million for the nine months ended September 30, 2019 and 2018, respectively.

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

	Amount
Balance as of December 31, 2018	$	11,009
Additions to deferred contract costs		10,894
Amortization of deferred contract costs		(3,688	)
Balance as of September 30, 2019	$	18,215

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 condensed consolidated statement of operations.

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

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

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 in the fourth quarter, 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 three or nine months ended September 30, 2019 or during the year ended December 31, 2018.

Operating Leases

The Company leases real estate facilities under operating leases. For leases that contain rent escalation or rent concession provisions, the Company records the total rent expense during the lease term on a straight-line basis over the term of the lease. Prior to the adoption of ASC 842, Leases on January 1, 2019, the Company records 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.

The Company’s operating lease costs were $3.9 million and $9.7 million during the three and nine months ended September 30, 2019, respectively. The Company recognized sublease income (including reimbursed expenses) of $0.2 million and $0.8 million during the three and nine months ended September 30, 2019, respectively. The Company’s variable lease costs amounted to $0.1 million and $0.1 million for the three and nine months ended September 30, 2019, respectively. The Company’s short-term lease costs were $0.6 million and $2.1 million for the three and nine months ended September 30, 2019, respectively.

The Company’s gross lease expense was $2.7 million and $6.5 million during the three and nine months ended September 30, 2018, respectively, which was offset by sublease income of $0.3 million and $0.5 million for the three and nine months ended September 30, 2018, respectively.

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.

The Company recognized into revenue $43.5 million and $21.7 million during the three months ended September 30, 2019 and 2018, respectively, and $62.9 million and $29.8 million during the nine months ended September 30, 2019 and September 30, 2018, respectively, that was included in the deferred revenue balances as of December 31, 2018 and 2017, respectively.

Remaining performance obligations represent the aggregate amount of the transaction price in contracts allocated to performance obligations not delivered, or partially undelivered, as of the end of the reporting period. Remaining performance obligations include unearned revenue, multi-year contracts with future installment payments and certain unfulfilled orders against accepted customer contracts at the end of any given period. As of September 30, 2019, and December 31, 2018, the aggregate transaction price allocated to remaining performance obligations was $206.4 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.

Net Loss Per Share Attributable to Common Shareholders

Basic net loss per share is computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing net 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 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 condensed 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 condensed 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. Prior to the adoption of the ASU, changes within restricted cash were presented within investing activities as changes related to payments and refunds of security deposits in connection with leases for the Company’s facilities. 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 condensed consolidated cash flows. Accordingly, the statement of cash flows has been revised to include restricted cash as a 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 condensed consolidated statement of cash flows. The Company’s condensed consolidated financial statements as of September 30, 2019 reflect the adoption of ASC 842.

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 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. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This guidance will be effective for the Company beginning January 1, 2020. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements.

Prepaid Expenses and Other Current Assets

9 Months Ended

Sep. 30, 2019

Prepaid Expense And Other Assets Current [Abstract]

Prepaid Expenses and Other Current Assets

3. Prepaid Expenses and Other Current Assets

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

	September 30, 2019		December 31, 2018
Hosting	$	8,554	$	3,356
General prepaid expenses		3,475		3,607
Other receivables		3,745		526
Marketing		1,114		218
Rent		809		1,066
Restricted cash		475		—
Total prepaid expenses and other current assets	$	18,172	$	8,773

Property and Equipment, Net

9 Months Ended

Sep. 30, 2019

Property Plant And Equipment [Abstract]

Property and Equipment, Net

4. Property and Equipment, Net

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

	September 30, 2019			December 31, 2018
Computers and equipment	$	6,757		$	4,540
Furniture and fixtures		4,330			2,621
Leasehold improvements		15,671			8,554
Capitalized software development costs		21,762			15,000
Total property and equipment	$	48,520		$	30,715
Less: accumulated depreciation and amortization		(17,254	)		(9,066	)
Total property and equipment, net	$	31,266		$	21,649

As discussed in Note 2, Basis of Presentation and Summary of Significant Accounting Policies—Internal Use Software, 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 $3.8 million and $8.3 million for the three and nine months ended September 30, 2019, respectively. Depreciation and amortization expense was approximately $1.6 million and $3.9 million for the three and nine months ended September 30, 2018, respectively.

Acquisition, Intangible Assets and Goodwill

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Acquisition, Intangible Assets and Goodwill

5. Acquisition, Intangible Assets and Goodwill

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 condensed 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 condensed 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

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

As of September 30, 2019

Gross

Carrying

Amount

Accumulated

Amortization

Net

Carrying

Amount

Amortization

Period

Developed technology

2,125

(1,366

)

759

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 $0.2 million and $0.5 million for the three and nine months ended September 30, 2019, respectively and was approximately $0.1 million and $0.3 million for the three and nine months ended September 30, 2018, respectively. Amortization of developed technology and customer relationships are included in cost of revenue on the Company’s condensed consolidated statement of operations and comprehensive loss.

As of September 30, 2019, future amortization expense by year is expected to be as follows (in thousands):

	Amount
Remainder of 2019	$	179
2020		378
2021		202
Total	$	759

Accrued Expenses and Other Current Liabilities

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

6. Accrued Expenses and Other Current Liabilities

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

	September 30, 2019		December 31, 2018
Accrued compensation and commissions	$	12,903	$	15,229
Early exercise liability-stock options		2,168		2,931
Income tax liability		731		516
Payroll and sales taxes		1,432		1,147
Deferred rent		—		3,527
Accrued expenses		13,247		6,940
Total accrued expenses and other current liabilities	$	30,481	$	30,290

Commitments and Contingencies

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

7. 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.

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 condensed consolidated statement of operations during the nine months ended September 30, 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 year ended December 31, 2018 and the nine months ended September 30, 2019.

Cloud Hosting Commitments—In April 2019 and September 2019, the Company entered into cloud hosting agreements, effective May 2019 and September 2019, respectively, for a total purchase commitment of $225.0 million and $37.5 million, respectively, payable over the three years following the date of the applicable agreement.

Legal Matters—The Company is involved from time to time in various claims and legal actions arising in the ordinary course of business. While it is not feasible to predict or determine the ultimate outcome of these matters, the Company believes that none of its current legal proceedings will have a material adverse effect on its financial position or results of operations.

Indemnification—The Company enters into indemnification provisions under some agreements with other parties in the ordinary course of business, including business partners, investors, contractors, customers, and the Company’s officers, directors and certain employees. The Company has agreed to indemnify and defend the indemnified party claims and related losses suffered or incurred by the indemnified party from actual or threatened third-party claim because of the Company’s activities or non-compliance with certain representations and warranties made by the Company. It is not possible to determine the maximum potential loss under these indemnification provisions due to the Company’s limited history of prior indemnification claims and the unique facts and circumstances involved in each particular provision. To date, losses recorded in the Company’s condensed consolidated statements of operations and comprehensive loss in connection with the indemnification provisions have not been material.

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

8. 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. The Company has elected the practical expedient not to record leases with an initial term of 12 months or less on the balance sheet; the Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company accounts for lease components and non-lease components as a single lease component. Operating lease assets and liabilities are reflected within operating lease assets; operating lease liabilities, current and operating lease liabilities, non-current, on the condensed consolidated balance sheet.

Lease expense for these leases is recognized on a straight-line basis over the lease term, with variable lease payments recognized in the period those payments are incurred.

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

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost⁽¹⁾	$	3,885	$	9,715
Variable lease cost⁽²⁾		126		136
Short-term lease cost		564		2,148

1)	Includes right of use amortization of $3.1 million and $7.6 million for the three and nine months ended September 30, 2019, respectively

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):

	Nine Months Ended September 30,
Cash paid for amounts included in measurement of lease liabilities	$	6,077
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
Remainder of 2019	$	2,830
2020		14,488
2021		16,795
2022		16,589
2023		14,403
2024 and beyond		4,017
Total lease payments	$	69,122
Less: imputed interest		(8,393	)
Present value of lease liabilities	$	60,729

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

September 30,

2019

Weighted average remaining lease term

4.20

Weighted average discount rate

5.03

Stockholders’ Equity (Deficit)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Stockholders’ Equity (Deficit)

9. Stockholders’ Equity (Deficit)

Class A and Class B Common Stock

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

As of September 30, 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 27,600,000 shares of Class A common stock and 268,113,075 shares of Class B common stock were issued and outstanding.

Preferred Stock

As of September 30, 2019, the Company had authorized 20,000,000 shares of preferred stock, at a par value per share of $0.00001, with rights and preferences, including voting rights, designated from time to time by the Board. No shares of preferred stock were issued and outstanding as of September 30, 2019.

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.

Equity Incentive Plans

The Company has two equity incentive plans, the 2012 equity incentive plan (the “2012 Plan”) and the 2019 equity incentive plan (the “2019 Plan”). On the date of the Final Prospectus, 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 September 30, 2019, there were 37,153,194 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 (“SARs”), restricted stock awards (“RSAs”), restricted stock units (“RSUs”), and performance-based and other awards, each valued or based on the Company’s Class A common stock, to employees, consultants, and advisors of the Company. Through September 30, 2019, the Company has only issued stock options in connection with the 2012 and 2019 Plans. As of September 30, 2019, the Company was authorized to grant awards representing up to 70,296,733 shares under the 2019 Plan and had awards representing 32,397,031 shares of Class A common stock available to grant under the 2019 Plan.

Stock option activity:

Stock option activity is as follows:

	Number Of Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)
Balance—December 31, 2018		38,865,057		$	0.83		7.9
Options granted		9,481,530		$	9.06
Options exercised		(10,114,941	)	$	0.72
Options forfeited		(1,078,452	)	$	2.29
Balance—September 30, 2019		37,153,194		$	2.92		7.9
Exercisable—September 30, 2019		21,090,498		$	2.24		7.3

Total compensation cost related to unvested awards not yet recognized was approximately $98.4 million and $28.4 million as of September 30, 2019 and December 31, 2018, respectively. The weighted average period over which this compensation cost related to unvested employee awards will be recognized is 3.6 years and 3.4 years as of September 30, 2019 and December 31, 2018, respectively.

The weighted average grant-date fair value of options granted during the nine months ended September 30, 2019 and September 30, 2018 was $8.68 and $2.39, respectively. The Company received approximately $7.3 million and $6.8 million in cash proceeds from options exercised during the nine months ended September 30, 2019 and September 30, 2018, respectively. The intrinsic value of options exercised during the nine months ended September 30, 2019 and September 30, 2018 was approximately $106.0 million and $26.8 million, respectively. The aggregate fair value of options vested during the nine months ended September 30, 2019 and 2018 was $8.5 million and $2.8 million, respectively.

Common stock purchased pursuant to an early exercise of stock options is not deemed to be outstanding for accounting purposes until those shares vest. The consideration received for an exercise of an option is considered to be a deposit of the exercise price and the related dollar amount is recorded as a liability. The shares issued upon the early exercise of these unvested stock option awards, which are reflected as exercises in the table above, are considered to be legally issued and outstanding on the date of exercise. Upon termination of service, the Company may repurchase unvested shares acquired through early exercise of stock options at a price equal to the price per share paid upon the exercise of such options. The Company has recorded liabilities related to early exercises of 1,548,000 shares of common stock and 2,095,656 shares of common stock as of September 30, 2019 and December 31, 2018, respectively

Employee Stock Purchase Plan

In September 2019, the Board adopted and approved the 2019 Employee Stock Purchase Plan (the “ESPP”), which became effective on the date of the Final Prospectus. 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 September 30, 2019, 6,725,000 shares of Class A common stock remain available for grant under the ESPP. The initial offering period began on the date of the Final Prospectus 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 $0.1 million of stock-based compensation expense related to the ESPP during the three months ended September 30, 2019, beginning upon the IPO in September 2019. As of September 30, 2019, no amounts have been withheld on behalf of employees for a future purchase under the ESPP due to the timing of payroll deductions. There were no purchases for the three months ended September 30, 2019 related to the ESPP.

Stock-Based Compensation

The Company uses the Black-Scholes option-pricing model to estimate the fair value of stock options on the date of grant. The Company accounts for forfeitures as they occur.

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of revenue	$	161	$	74	$	372	$	182
Research and development		1,934		387		3,709		931
Sales and marketing		1,540		522		3,276		1,241
General and administrative		1,042		325		2,659		697
Stock-based compensation, net of amounts capitalized		4,677		1,308		10,016		3,051
Capitalized stock-based compensation expense		14		61		137		136
Total stock-based compensation expense	$	4,691	$	1,369	$	10,153	$	3,187

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

10. Income Taxes

The Company has an effective tax rate of (0.8)% and (8.1)% for the three months ended September 30, 2019 and 2018, respectively, and (2.2)% and (11.4)% for the nine months ended September 30, 2019 and 2018, respectively. The Company has incurred U.S. operating losses and has minimal profits in its foreign jurisdictions.

The Company has evaluated the available evidence supporting the realization of its deferred tax assets, including the amount and timing of future taxable income, and has determined that it is more likely than not that its net deferred tax assets will not be realized in the U.S. Due to uncertainties surrounding the realization of the deferred tax assets, the Company maintains a full valuation allowance against substantially all of its net deferred tax assets. When the Company determines that it will be able to realize some portion or all of its deferred tax assets, an adjustment to its valuation allowance on its deferred tax assets would have the effect of increasing net income in the period such determination is made.

The Company has applied ASC 740, Income Taxes, and has determined that it has uncertain positions that would result in a tax reserve deemed immaterial for the nine months ended September 30, 2019 and $0.2 million for the nine months ended September 30, 2018. The Company’s policy is to recognize interest and penalties related to uncertain tax positions in income tax expense. The Company is subject to U.S. federal tax authority, U.S. state tax authority and foreign tax authority examinations.

Net Loss Per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Net Loss Per Share

11. Net Loss Per Share

Basic and diluted net loss per common share is presented in conformity with the two-class method required for participating securities. Immediately prior to the consummation of the Company’s IPO in September 2019, all outstanding shares of convertible preferred stock and common stock were converted to Class B common stock. As a result, Class A and Class B common stock are the only outstanding equity in the Company.

Basic and diluted net loss per share is computed using the weighted-average number of common shares outstanding during the period. The undistributed earnings are allocated based on the contractual participation rights of the Class A and Class B common shares as if the earnings for the year have been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. Further, as the conversion of Class B common stock is assumed in the computation of the diluted net loss per share of Class A common stock, the undistributed earnings are equal to net loss for that computation.

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

	Three Months Ended September 30,									Nine Months Ended September 30,
	2019						2018			2019						2018
Basic net loss per share:	Class A			Class B						Class A			Class B
Numerator:
Net loss	$	(93	)	$	(4,068	)	$	(4,673	)	$	(157	)	$	(17,444	)	$	(4,175	)
Denominator:
Weighted average shares used in calculating net loss per share, basic		2,322			101,554			73,353			782			86,976			69,708
Basic net loss per share	$	(0.04	)	$	(0.04	)	$	(0.06	)	$	(0.20	)	$	(0.20	)	$	(0.06	)
Diluted net loss per share:
Numerator:
Allocation of distributed loss for basic computation	$	(93	)	$	(4,068	)	$	(4,673	)	$	(157	)	$	(17,444	)	$	(4,175	)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares		(4,068	)		—			—			(17,444	)		—			—
Allocation of undistributed loss	$	(4,161	)	$	(4,068	)	$	(4,673	)	$	(17,601	)	$	(17,444	)	$	(4,175	)
Denominator:
Number of shares used in basic calculation		2,322			101,554			73,353			782			86,976			69,708
Weighted average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding		101,554			—			—			86,976			—			—
Number of shares used in diluted calculation		103,876			101,554			73,353			87,758			86,976			69,708
Diluted net loss per share	$	(0.04	)	$	(0.04	)	$	(0.06	)	$	(0.20	)	$	(0.20	)	$	(0.06	)

Since the Company was in a loss position for the periods presented, basic net loss per share is the same as diluted net loss per share as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):

	As of September 30,
	2019		2018

Convertible Preferred Stock		—		179,815
Shares subject to outstanding stock options		37,153		39,981
Unvested early exercised stock options		1,548		2,204
Total		38,701		222,000

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

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

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

Principles of Consolidation

Stock Split and Authorized Shares

Segment Information

Use of Estimates

Unaudited Interim Condensed Consolidated Financial Information

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

Advertising Costs

Income Taxes

Stock-Based Compensation

Cash and Cash Equivalents

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):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
North America	$	70,904	$	38,791	$	186,340	$	101,976
International		24,960		12,283		62,796		34,491
Total	$	95,864	$	51,074	$	249,136	$	136,467

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 December 31, 2018	$	11,009
Additions to deferred contract costs		10,894
Amortization of deferred contract costs		(3,688	)
Balance as of September 30, 2019	$	18,215

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 Loss Per Share Attributable to Common Shareholders

Accounting Pronouncements Recently Adopted

Accounting Pronouncements Not Yet Adopted

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

9 Months Ended

Sep. 30, 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):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
North America	$	70,904	$	38,791	$	186,340	$	101,976
International		24,960		12,283		62,796		34,491
Total	$	95,864	$	51,074	$	249,136	$	136,467

Schedule of Deferred Contract Costs

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

	Amount
Balance as of December 31, 2018	$	11,009
Additions to deferred contract costs		10,894
Amortization of deferred contract costs		(3,688	)
Balance as of September 30, 2019	$	18,215

Schedule of Long-lived Assets Amortized Over Estimated Useful Lives

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

Prepaid Expenses and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 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):

	September 30, 2019		December 31, 2018
Hosting	$	8,554	$	3,356
General prepaid expenses		3,475		3,607
Other receivables		3,745		526
Marketing		1,114		218
Rent		809		1,066
Restricted cash		475		—
Total prepaid expenses and other current assets	$	18,172	$	8,773

Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2019

Property Plant And Equipment [Abstract]

Components of Property and Equipment, Net

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

	September 30, 2019			December 31, 2018
Computers and equipment	$	6,757		$	4,540
Furniture and fixtures		4,330			2,621
Leasehold improvements		15,671			8,554
Capitalized software development costs		21,762			15,000
Total property and equipment	$	48,520		$	30,715
Less: accumulated depreciation and amortization		(17,254	)		(9,066	)
Total property and equipment, net	$	31,266		$	21,649

Acquisition, Intangible Assets and Goodwill (Tables)

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

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

Schedule of Intangibles, Net

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

As of September 30, 2019

Gross

Carrying

Amount

Accumulated

Amortization

Net

Carrying

Amount

Amortization

Period

Developed technology

2,125

(1,366

)

759

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 September 30, 2019, future amortization expense by year is expected to be as follows (in thousands):

	Amount
Remainder of 2019	$	179
2020		378
2021		202
Total	$	759

Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 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):

	September 30, 2019		December 31, 2018
Accrued compensation and commissions	$	12,903	$	15,229
Early exercise liability-stock options		2,168		2,931
Income tax liability		731		516
Payroll and sales taxes		1,432		1,147
Deferred rent		—		3,527
Accrued expenses		13,247		6,940
Total accrued expenses and other current liabilities	$	30,481	$	30,290

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Summary of Components of Lease Cost Recognized

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

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost⁽¹⁾	$	3,885	$	9,715
Variable lease cost⁽²⁾		126		136
Short-term lease cost		564		2,148

1)	Includes right of use amortization of $3.1 million and $7.6 million for the three and nine months ended September 30, 2019, respectively

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):

	Nine Months Ended September 30,
Cash paid for amounts included in measurement of lease liabilities	$	6,077
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
Remainder of 2019	$	2,830
2020		14,488
2021		16,795
2022		16,589
2023		14,403
2024 and beyond		4,017
Total lease payments	$	69,122
Less: imputed interest		(8,393	)
Present value of lease liabilities	$	60,729

Summary of Weighted Average Remaining Lease Term and Discount Rate

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

September 30,

2019

Weighted average remaining lease term

4.20

Weighted average discount rate

5.03

Stockholders’ Equity (Deficit) (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Summary of Stock Option Activity

Stock option activity is as follows:

	Number Of Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)
Balance—December 31, 2018		38,865,057		$	0.83		7.9
Options granted		9,481,530		$	9.06
Options exercised		(10,114,941	)	$	0.72
Options forfeited		(1,078,452	)	$	2.29
Balance—September 30, 2019		37,153,194		$	2.92		7.9
Exercisable—September 30, 2019		21,090,498		$	2.24		7.3

Summary of Stock-based Compensation Expense

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of revenue	$	161	$	74	$	372	$	182
Research and development		1,934		387		3,709		931
Sales and marketing		1,540		522		3,276		1,241
General and administrative		1,042		325		2,659		697
Stock-based compensation, net of amounts capitalized		4,677		1,308		10,016		3,051
Capitalized stock-based compensation expense		14		61		137		136
Total stock-based compensation expense	$	4,691	$	1,369	$	10,153	$	3,187

Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Calculation of Basic and Diluted Net Loss Per Share

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

	Three Months Ended September 30,									Nine Months Ended September 30,
	2019						2018			2019						2018
Basic net loss per share:	Class A			Class B						Class A			Class B
Numerator:
Net loss	$	(93	)	$	(4,068	)	$	(4,673	)	$	(157	)	$	(17,444	)	$	(4,175	)
Denominator:
Weighted average shares used in calculating net loss per share, basic		2,322			101,554			73,353			782			86,976			69,708
Basic net loss per share	$	(0.04	)	$	(0.04	)	$	(0.06	)	$	(0.20	)	$	(0.20	)	$	(0.06	)
Diluted net loss per share:
Numerator:
Allocation of distributed loss for basic computation	$	(93	)	$	(4,068	)	$	(4,673	)	$	(157	)	$	(17,444	)	$	(4,175	)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares		(4,068	)		—			—			(17,444	)		—			—
Allocation of undistributed loss	$	(4,161	)	$	(4,068	)	$	(4,673	)	$	(17,601	)	$	(17,444	)	$	(4,175	)
Denominator:
Number of shares used in basic calculation		2,322			101,554			73,353			782			86,976			69,708
Weighted average effect of diluted securities:
Conversion of Class B to Class A common shares outstanding		101,554			—			—			86,976			—			—
Number of shares used in diluted calculation		103,876			101,554			73,353			87,758			86,976			69,708
Diluted net loss per share	$	(0.04	)	$	(0.04	)	$	(0.06	)	$	(0.20	)	$	(0.20	)	$	(0.06	)

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

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

	As of September 30,
	2019		2018

Convertible Preferred Stock		—		179,815
Shares subject to outstanding stock options		37,153		39,981
Unvested early exercised stock options		1,548		2,204
Total		38,701		222,000

Organization and Description of Business - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
	Sep. 25, 2019	Sep. 23, 2019	Sep. 30, 2019	Dec. 31, 2018
Subsidiary Sale Of Stock [Line Items]
Date of Incorporation			Jun. 04, 2010
Common stock, shares issued			0	78,180,606
Additional proceeds net of underwriters discounts and commissions			$ 708,659
IPO
Subsidiary Sale Of Stock [Line Items]
Net deferred offering costs			$ 2,000
Class A Common Stock
Subsidiary Sale Of Stock [Line Items]
Common stock, shares issued			27,600,000	0
Class A Common Stock \| IPO
Subsidiary Sale Of Stock [Line Items]
Common stock, shares issued		24,000,000
Common stock offering price		$ 27.00
Net proceeds after deducting underwriting discounts and commissions		$ 615,600
Class A Common Stock \| Underwriters
Subsidiary Sale Of Stock [Line Items]
Common stock offering price	$ 27.00
Underwriters exercised option to purchase additional shares	3,600,000
Additional proceeds net of underwriters discounts and commissions	$ 92,300
Class B Common Stock
Subsidiary Sale Of Stock [Line Items]
Common stock, shares issued			268,113,075	0
Convertible preferred stock converted into common stock			179,011,431
Class B Common Stock \| IPO
Subsidiary Sale Of Stock [Line Items]
Convertible preferred stock converted into common stock	179,011,431

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)			3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 06, 2019 shares	Jan. 02, 2018	Sep. 30, 2019 USD ($) Customer shares	Sep. 30, 2018 USD ($) Customer	Sep. 30, 2019 USD ($) Segment Customer shares	Sep. 30, 2018 USD ($) Customer	Dec. 31, 2018 USD ($) Customer shares	Sep. 23, 2019 shares	Jan. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Stock split, conversion ratio	0.333	0.25
Common stock, shares authorized \| shares	380,000,000		0		0		380,000,000	2,330,000,000
Preferred stock, shares authorized \| shares			20,000,000		20,000,000		0	20,000,000
Number of operating segment \| Segment					1
Number of reportable segment \| Segment					1
Cash and cash equivalents			$ 760,945,000	$ 64,003,000	$ 760,945,000	$ 64,003,000	$ 53,639,000
Restricted cash			$ 9,507,000		$ 9,507,000		11,341,000
Deferred contract costs amortization period			4 years		4 years
Deferred contract costs			$ 18,200,000		$ 18,200,000		11,000,000
Amortization expense			1,400,000	700,000	3,700,000	1,800,000
Impairment of goodwill			0		0		0
Operating lease costs			3,885,000		9,715,000
Sublease income			200,000	300,000	800,000	500,000
Variable lease costs			126,000		136,000
Short-term lease costs			564,000		2,148,000
Gross lease expense				2,700,000		6,500,000
Revenue recognized			43,500,000	$ 21,700,000	62,900,000	$ 29,800,000
Deferred revenue							62,900,000			$ 29,800,000
Right of use asset			55,695,000		55,695,000				$ 47,900,000
Lease liability			60,729,000		60,729,000				$ 51,400,000
Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Unbilled accounts receivable			$ 13,100,000		$ 13,100,000		$ 13,100,000
North America
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of long lived assets					72.00%		85.00%
Out of North America
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Percentage of long lived assets					28.00%		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	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		0
Sales and Marketing
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Advertising costs			$ 2,700,000	$ 2,300,000	$ 7,300,000	$ 6,000,000
Convertible Preferred Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Convertible preferred stock, shares authorized \| shares	179,814,912		0		0		179,814,912
Class A
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares authorized \| shares			2,000,000,000		2,000,000,000		0	2,000,000,000
Class B
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares authorized \| shares			310,000,000		310,000,000		0	310,000,000

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue by geographic area	$ 95,864	$ 51,074	$ 249,136	$ 136,467
North America
Disaggregation Of Revenue [Line Items]
Revenue by geographic area	70,904	38,791	186,340	101,976
International
Disaggregation Of Revenue [Line Items]
Revenue by geographic area	$ 24,960	$ 12,283	$ 62,796	$ 34,491

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Capitalized Contract Cost [Abstract]
Balance as of December 31, 2018	$ 11,009
Additions to deferred contract costs	10,894	$ 6,045
Amortization of deferred contract costs	(3,688)
Balance as of September 30, 2019	$ 18,215

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Long-lived Assets Amortized Over Estimated Useful Lives (Details)	9 Months Ended
	Sep. 30, 2019
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
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

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details 1) - USD ($) $ in Millions	Sep. 30, 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: 2019-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining performance obligations	$ 206.4
Remaining performance obligations, expected to recognize period	3 months

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]
Hosting	$ 8,554	$ 3,356
General prepaid expenses	3,475	3,607
Other receivables	3,745	526
Marketing	1,114	218
Rent	809	1,066
Restricted cash	475
Total prepaid expenses and other current assets	$ 18,172	$ 8,773

Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment	$ 48,520	$ 30,715
Less: accumulated depreciation and amortization	(17,254)	(9,066)
Total property and equipment, net	31,266	21,649
Computers and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	6,757	4,540
Furnitures and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	4,330	2,621
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	15,671	8,554
Capitalized Software Development Costs
Property Plant And Equipment [Line Items]
Total property and equipment	$ 21,762	$ 15,000

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Property Plant And Equipment [Abstract]
Depreciation and amortization expense	$ 3.8	$ 1.6	$ 8.3	$ 3.9

Acquisition, Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration					$ 1,618
Intangible amortization expense		$ 200	$ 100	$ 500	$ 300
Madumbo
Acquisition Intangible Assets And Goodwill [Line Items]
Cash consideration	$ 1,600
Transaction costs	$ 100

Acquisition, Intangible Assets and Goodwill - Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 28, 2018
Fair value of net assets acquired:
Goodwill	$ 7,626	$ 7,626
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

Acquisition, Intangible Assets and Goodwill - Schedule of Intangibles, Net (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 2,145
Accumulated Amortization		(857)
Net Carrying Amount	$ 759	1,288
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,125	2,125
Accumulated Amortization	(1,366)	(837)
Net Carrying Amount	$ 759	$ 1,288
Developed Technology \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortization Period	2 years	2 years
Developed Technology \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortization Period	3 years	3 years
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 20
Accumulated Amortization		$ (20)
Amortization Period		1 year

Acquisition, Intangible Assets and Goodwill - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 179
2020	378
2021	202
Net Carrying Amount	$ 759	$ 1,288

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued compensation and commissions	$ 12,903	$ 15,229
Early exercise liability-stock options	2,168	2,931
Income tax liability	731	516
Payroll and sales taxes	1,432	1,147
Deferred rent		3,527
Accrued expenses	13,247	6,940
Total accrued expenses and other current liabilities	$ 30,481	$ 30,290

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended		9 Months Ended
	Sep. 30, 2019	May 31, 2019	Sep. 30, 2019	Jan. 31, 2015
Commitments And Contingencies [Line Items]
Contingent federal payroll tax liability				$ 5.0
Benefit on federal payroll tax liability			$ 5.0
Total purchase commitment	$ 37.5	$ 225.0
Purchase commitment payable period	3 years	3 years
Minimum
Commitments And Contingencies [Line Items]
Noncancelable operating leases			2019
Maximum
Commitments And Contingencies [Line Items]
Noncancelable operating leases			2025

Leases - Additional Information (Details)	9 Months Ended
Leases - Additional Information (Details)	Sep. 30, 2019
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
Lease, Practical Expedient, Lessor Single Lease Component [true false]	true
Minimum
Lessee Lease Description [Line Items]
Noncancelable operating lease expiration period	2019
Maximum
Lessee Lease Description [Line Items]
Noncancelable operating lease expiration period	2025
Operating lease, renewal term	5 years
Operating lease, termination term	3 years

Leases - Summary of Components of Lease Cost Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 3,885	$ 9,715
Variable lease cost	126	136
Short-term lease cost	$ 564	$ 2,148

Leases - Summary of Components of Lease Cost Recognized (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease, right of use amortization	$ 3.1	$ 7.6

Leases - Summary of Supplemental Cash Flow Information and Non-cash Activity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Cash paid for amounts included in measurement of lease liabilities	$ 6,077
Operating lease assets obtained in exchange for new lease liabilities	$ 14,618

Leases - Summary of Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Remainder of 2019	$ 2,830
2020	14,488
2021	16,795
2022	16,589
2023	14,403
2024 and beyond	4,017
Total lease payments	69,122
Less: imputed interest	(8,393)
Present value of lease liabilities	$ 60,729	$ 51,400

Leases - Summary of Weighted Average Remaining Lease Term and Discount Rate (Details)	Sep. 30, 2019
Leases [Abstract]
Weighted average remaining lease term	4 years 2 months 12 days
Weighted average discount rate	5.03%

Stockholders' Equity (Deficit) - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Vote $ / shares shares	Sep. 30, 2018 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 25, 2019 shares	Sep. 23, 2019 shares	Sep. 06, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
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
Common stock, shares authorized	0	0		0		380,000,000		2,330,000,000	380,000,000
Common stock, par value \| $ / shares	$ 0.00001	$ 0.00001		$ 0.00001		$ 0.00001
Common stock, shares issued	0	0		0		78,180,606
Common stock, shares outstanding	0	0		0		78,180,606
Preferred stock, shares authorized	20,000,000	20,000,000		20,000,000		0		20,000,000
Preferred stock, par value \| $ / shares	$ 0.00001	$ 0.00001		$ 0.00001		$ 0.00001
Preferred stock, shares issued	0	0		0		0
Preferred stock, shares outstanding	0	0		0		0
Proceeds from exercise of stock options \| $				$ 7,306,000	$ 6,833,000
Share-based payment arrangement, expense \| $		$ 4,677,000	$ 1,308,000	10,016,000	$ 3,051,000
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation cost related to unvested awards not yet recognized \| $	$ 98,400,000	$ 98,400,000		$ 98,400,000		$ 28,400,000
Weighted average period over compensation cost related to unvested employee awards				3 years 7 months 6 days		3 years 4 months 24 days
Weighted average grant-date fair value of options granted \| $ / shares				$ 8.68	$ 2.39
Proceeds from exercise of stock options \| $				$ 7,300,000	$ 6,800,000
Intrinsic value of options exercised \| $				106,000,000	26,800,000
Aggregate fair value of options vested \| $				$ 8,500,000	$ 2,800,000
Early exercise of common stock	1,548,000	1,548,000		1,548,000		2,095,656
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	70,296,733		70,296,733
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of purchase the shares at a price per share	85.00%
Share-based payment arrangement, expense \| $		$ 100,000
Amounts withheld on behalf of employees for a future purchase due to the timing of payroll deductions \| $		$ 0
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of voting rights entitled to stockholders per share \| Vote				1
Common stock, shares authorized	2,000,000,000	2,000,000,000		2,000,000,000		0		2,000,000,000
Common stock, par value \| $ / shares	$ 0.00001	$ 0.00001		$ 0.00001		$ 0.00001
Common stock, shares issued	27,600,000	27,600,000		27,600,000		0
Common stock, shares outstanding	27,600,000	27,600,000		27,600,000		0
Class A Common Stock \| Initial Public Offering
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares issued								24,000,000
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	32,397,031	32,397,031		32,397,031
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	6,725,000		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	$ 27.00		$ 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	6,725,000		6,725,000
Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of voting rights entitled to stockholders per share \| Vote				10
Common stock, shares authorized	310,000,000	310,000,000		310,000,000		0		310,000,000
Common stock, par value \| $ / shares	$ 0.00001	$ 0.00001		$ 0.00001		$ 0.00001
Common stock, shares issued	268,113,075	268,113,075		268,113,075		0
Common stock, shares outstanding	268,113,075	268,113,075		268,113,075		0
Convertible preferred stock converted into common stock	179,011,431	179,011,431		179,011,431
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]
Class A common stock issuable upon conversion of Class B common stock				37,153,194

Stockholders' Equity (Deficit) - Summary of Stock Option Activity (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Number Of Options Outstanding
Balance—December 31, 2018 \| shares	38,865,057
Options granted \| shares	9,481,530
Options exercised \| shares	(10,114,941)
Options forfeited \| shares	(1,078,452)
Balance—September 30, 2019 \| shares	37,153,194	38,865,057
Exercisable—September 30, 2019 \| shares	21,090,498
Weighted-Average Exercise Price
Balance—December 31, 2018 \| $ / shares	$ 0.83
Options granted \| $ / shares	9.06
Options exercised \| $ / shares	0.72
Options forfeited \| $ / shares	2.29
Balance—September 30, 2019 \| $ / shares	2.92	$ 0.83
Exercisable—September 30, 2019 \| $ / shares	$ 2.24
Weighted-Average Remaining Contractual Life (in Years)
Options outstanding	7 years 10 months 24 days	7 years 10 months 24 days
Options exercisable	7 years 3 months 18 days

Stockholders' Equity (Deficit) - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	$ 4,677	$ 1,308	$ 10,016	$ 3,051
Capitalized stock-based compensation expense	14	61	137	136
Total stock-based compensation expense	4,691	1,369	10,153	3,187
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	161	74	372	182
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	1,934	387	3,709	931
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	1,540	522	3,276	1,241
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation, net of amounts capitalized	$ 1,042	$ 325	$ 2,659	$ 697

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	(0.80%)	(8.10%)	(2.20%)	(11.40%)
Uncertain tax positions				$ 0.2

Net Loss Per Share - Schedule of Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic net loss per share:
Net loss	$ (4,161)	$ (4,673)	$ (17,601)	$ (4,175)
Weighted average shares used in calculating net loss per share, basic		73,353		69,708
Basic net loss per share		$ (0.06)		$ (0.06)
Diluted net loss per share:
Allocation of distributed loss for basic computation		$ (4,673)		$ (4,175)
Allocation of undistributed loss		$ (4,673)		$ (4,175)
Weighted average shares used in calculating net loss per share, basic		73,353		69,708
Number of shares used in diluted calculation		73,353		69,708
Diluted net loss per share		$ (0.06)		$ (0.06)
Class A
Basic net loss per share:
Net loss	$ (93)		$ (157)
Weighted average shares used in calculating net loss per share, basic	2,322		782
Basic net loss per share	$ (0.04)		$ (0.20)
Diluted net loss per share:
Allocation of distributed loss for basic computation	$ (93)		$ (157)
Reallocation of undistributed loss as a result of conversion of Class B to Class A shares	(4,068)		(17,444)
Allocation of undistributed loss	$ (4,161)		$ (17,601)
Weighted average shares used in calculating net loss per share, basic	2,322		782
Conversion of Class B to Class A common shares outstanding	101,554		86,976
Number of shares used in diluted calculation	103,876		87,758
Diluted net loss per share	$ (0.04)		$ (0.20)
Class B
Basic net loss per share:
Net loss	$ (4,068)		$ (17,444)
Weighted average shares used in calculating net loss per share, basic	101,554		86,976
Basic net loss per share	$ (0.04)		$ (0.20)
Diluted net loss per share:
Allocation of distributed loss for basic computation	$ (4,068)		$ (17,444)
Allocation of undistributed loss	$ (4,068)		$ (17,444)
Weighted average shares used in calculating net loss per share, basic	101,554		86,976
Number of shares used in diluted calculation	101,554		86,976
Diluted net loss per share	$ (0.04)		$ (0.20)

Net Loss Per Share - Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations	38,701	222,000
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
Shares Subject to Outstanding Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in diluted per share calculations	37,153	39,981
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	1,548	2,204