Snap (SNAP) 10-K 5 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 28, 2019
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	SNAP
Entity Registrant Name	SNAP INC
Entity Central Index Key	0001564408
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Public Float			$ 13.6
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-38017
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-5452795
Entity Address, Address Line One	2772 Donald Douglas Loop North
Entity Address, City or Town	Santa Monica
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90405
City Area Code	(310)
Local Phone Number	399-3339
Title of 12(b) Security	Class A Common Stock, par value $0.00001 per share
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1,164,739,858
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		24,303,857
Class C Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		231,147,476

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net loss	$ (1,033,660)	$ (1,255,911)	$ (3,445,066)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	87,245	91,648	61,288
Stock-based compensation	686,013	538,211	2,639,895
Deferred income taxes	(491)	(383)	(17,490)
Gain on divestiture	(39,883)	0	0
Amortization of debt discount and issuance costs	17,797	0	0
Lease exit charges	0	33,033	0
Excess inventory reserve and related asset impairment	0	0	21,997
Other	(28,575)	(903)	(6,356)
Change in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable, net of allowance	(147,862)	(77,506)	(104,357)
Prepaid expenses and other current assets	(9,849)	1,594	(39,783)
Operating lease right-of-use assets	58,199	0	0
Other assets	1,169	21,785	(4,771)
Accounts payable	20,674	(33,532)	49,696
Accrued expenses and other current liabilities	146,063	(14,325)	100,988
Operating lease liabilities	(60,844)	0	0
Other liabilities	(954)	6,365	9,292
Net cash used in operating activities	(304,958)	(689,924)	(734,667)
Cash flows from investing activities
Purchases of property and equipment	(36,478)	(120,242)	(84,518)
Sales of property and equipment	0	11,276	0
Proceeds from divestiture, net	73,796	0	0
Cash paid for acquisitions, net of cash acquired	(77,119)	(815)	(386,011)
Non-marketable investments	(5,481)	(22,495)	(10,030)
Purchases of marketable securities	(2,477,388)	(1,653,918)	(3,862,637)
Sales of marketable securities	184,179	45,007	511,068
Maturities of marketable securities	1,608,854	2,438,206	2,483,225
Other	1,029	(2,565)	(8,107)
Net cash provided by (used in) investing activities	(728,608)	694,454	(1,357,010)
Cash flows from financing activities
Proceeds from issuance of convertible notes, net of issuance costs	1,251,411	0	0
Purchase of capped calls	(102,086)	0	0
Proceeds from the exercise of stock options	16,527	47,988	11,379
Stock repurchases from employees for tax withholdings	0	(551)	(394,156)
Proceeds from issuance of Class A common stock in initial public offering, net of underwriting commissions	0	0	2,657,797
Payments of deferred offering costs	0	0	(9,672)
Net cash provided by financing activities	1,165,852	47,437	2,265,348
Change in cash, cash equivalents, and restricted cash	132,286	51,967	173,671
Cash, cash equivalents, and restricted cash, beginning of period	388,974	337,007	163,336
Cash, cash equivalents, and restricted cash, end of period	521,260	388,974	337,007
Supplemental disclosures
Cash paid for income taxes, net	156	3,598	6,226
Supplemental disclosures of non-cash activities
Net change in accounts payable and accrued expenses and other current liabilities related to property and equipment additions	$ (6,027)	$ (7,764)	$ 13,139

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 1,715,534	$ 1,180,446	$ 824,949
Costs and expenses:
Cost of revenue	895,838	798,865	717,462
Research and development	883,509	772,185	1,534,863
Sales and marketing	458,598	400,824	522,605
General and administrative	580,917	477,022	1,535,595
Total costs and expenses	2,818,862	2,448,896	4,310,525
Operating loss	(1,103,328)	(1,268,450)	(3,485,576)
Interest income	36,042	27,228	21,096
Interest expense	(24,994)	(3,894)	(3,456)
Other income (expense), net	59,013	(8,248)	4,528
Loss before income taxes	(1,033,267)	(1,253,364)	(3,463,408)
Income tax benefit (expense)	(393)	(2,547)	18,342
Net loss	$ (1,033,660)	$ (1,255,911)	$ (3,445,066)
Net loss per share attributable to Class A, Class B, and Class C common stockholders (Note 3):
Basic	$ (0.75)	$ (0.97)	$ (2.95)
Diluted	$ (0.75)	$ (0.97)	$ (2.95)
Weighted average shares used in computation of net loss per share:
Basic	1,375,462	1,300,568	1,166,085
Diluted	1,375,462	1,300,568	1,166,085

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (1,033,660)	$ (1,255,911)	$ (3,445,066)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities, net of tax	797	710	(1,122)
Foreign currency translation	(3,371)	(11,720)	17,336
Total other comprehensive income (loss), net of tax	(2,574)	(11,010)	16,214
Total comprehensive income (loss)	$ (1,036,234)	$ (1,266,921)	$ (3,428,852)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 520,317	$ 387,149
Marketable securities	1,592,488	891,914
Accounts receivable, net of allowance	492,194	354,965
Prepaid expenses and other current assets	38,987	41,900
Total current assets	2,643,986	1,675,928
Property and equipment, net	173,667	212,560
Operating lease right-of-use assets	275,447
Intangible assets, net	92,121	126,054
Goodwill	761,153	632,370
Other assets	65,550	67,194
Total assets	4,011,924	2,714,106
Current liabilities
Accounts payable	46,886	30,876
Operating lease liabilities	42,179
Accrued expenses and other current liabilities	410,610	261,815
Total current liabilities	499,675	292,691
Convertible senior notes, net	891,776
Operating lease liabilities, noncurrent	303,178
Other liabilities	57,382	110,416
Total liabilities	1,752,011	403,107
Commitments and contingencies (Note 8)
Stockholders’ equity
Additional paid-in capital	9,205,256	8,220,417
Accumulated other comprehensive income	573	3,147
Accumulated deficit	(6,945,930)	(5,912,578)
Total stockholders’ equity	2,259,913	2,310,999
Total liabilities and stockholders’ equity	4,011,924	2,714,106
Class A Non-voting Common Stock
Stockholders’ equity
Common stock, value	12	10
Class B Voting Common Stock
Stockholders’ equity
Common stock, value		1
Class C Voting Common Stock
Stockholders’ equity
Common stock, value	$ 2	$ 2

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Class A Non-voting Common Stock
Common stock par value	$ 0.00001	$ 0.00001
Common stock authorized	3,000,000,000	3,000,000,000
Common stock issued	1,160,127,014	999,304,000
Common stock outstanding	1,160,127,014	999,304,000
Class B Voting Common Stock
Common stock par value	$ 0.00001	$ 0.00001
Common stock authorized	700,000,000	700,000,000
Common stock issued	24,521,607	93,845,000
Common stock outstanding	24,521,607	93,845,000
Class C Voting Common Stock
Common stock par value	$ 0.00001	$ 0.00001
Common stock authorized	260,887,848	260,888,000
Common stock issued	231,147,476	224,611,000
Common stock outstanding	231,147,476	224,611,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Convertible Voting Preferred Stock, Series A, A-1, and BPreferred Stock	Convertible Non-voting Preferred Stock, Series CPreferred Stock	Convertible Non-voting Preferred Stock, Series D, E, and FPreferred Stock	Series FP Convertible Voting Preferred StockPreferred Stock	Class A Non-voting Common Stock	Class A Non-voting Common StockCommon Stock	Class B Voting Common Stock	Class B Voting Common StockCommon Stock	Class C Voting Common Stock	Class C Voting Common StockCommon Stock
Balance, beginning of period, shares at Dec. 31, 2016					146,962	16,000	83,851	215,887		504,902		31,469
Balance, beginning of period at Dec. 31, 2016		$ 2,728,823	$ (1,207,862)	$ (2,057)	$ 1		$ 2	$ 2		$ 5
Stock-based compensation expense		2,639,895
Net loss	$ (3,445,066)		(3,445,066)						$ (2,169,120)		$ (548,098)		$ (727,848)
Conversion of stock to voting/non-voting common stock, shares					(146,962)	(16,000)	(83,851)	(215,887)		169,800		246,813		215,887
Conversion of stock to voting/non-voting common stock					$ (1)		$ (2)	$ (2)		$ 2		$ 2		$ 2
Issuance of Class C voting common stock for settlement of restricted stock units, net, shares														3,122
Shares issued in connection with exercise of stock options under stock-based compensation plans, shares										9,928		9,396
Shares issued in connection with exercise of stock options under stock-based compensation plans		11,379
Shares converted to Class A non-voting common stock and subsequently sold in connection with exercise of stock options, shares												(4,923)
Shares issued in connection with exercise of stock options, converted from Class B voting common stock and subsequently sold										4,923
Issuance of Class A non-voting common stock in connection with acquisitions and divestitures, Shares										1,854
Issuance of Class A non-voting common stock in connection with acquisitions and divestitures		6,406
Issuance of voting/non-voting common stock for vesting of restricted stock units and restricted stock awards, shares										40,922		18,906
Issuance of voting/non-voting common stock for vesting of restricted stock units and restricted stock awards, net												$ 1
Issuance of stock, net of issuance costs. shares										160,350
Issuance of stock, net of issuance costs		2,642,729								$ 2
Stock repurchases from employees for tax withholdings		(394,407)
Stock repurchases from employees for tax withholdings, shares										(16,867)		(8,390)
Class A non-voting common stock sold to cover taxes, shares										7,210
Shares converted to Class A non-voting common stock and subsequently sold to cover taxes, shares												(907)		(2,393)
Other comprehensive income (loss)	$ 16,214			16,214
Balance, end of period, shares at Dec. 31, 2017	1,222,202									883,022		122,564		216,616
Balance, end of period at Dec. 31, 2017	$ 2,992,327	7,634,825	(4,656,667)	14,157						$ 9		$ 1		$ 2
Cumulative-effect adjustment from accounting changes			(3,739)
Stock-based compensation expense		538,211
Net loss	(1,255,911)		(1,255,911)						(921,235)		(94,897)		(239,779)
Conversion of stock to voting/non-voting common stock, shares										35,634
Issuance of Class C voting common stock for settlement of restricted stock units, net, shares														7,995
Shares issued in connection with exercise of stock options under stock-based compensation plans, shares										15,856		3,414
Shares issued in connection with exercise of stock options under stock-based compensation plans		47,988
Issuance of voting/non-voting common stock for vesting of restricted stock units and restricted stock awards, shares										64,831		3,502
Issuance of voting/non-voting common stock for vesting of restricted stock units and restricted stock awards, net										$ 1
Stock repurchases from employees for tax withholdings		(607)
Stock repurchases from employees for tax withholdings, shares										(39)
Other comprehensive income (loss)	$ (11,010)			(11,010)
Balance, end of period, shares at Dec. 31, 2018	1,317,761									999,304		93,846		224,611
Balance, end of period at Dec. 31, 2018	$ 2,310,999	8,220,417	(5,912,578)	3,147						$ 10		$ 1		$ 2
Stock-based compensation expense		686,013
Net loss	(1,033,660)		(1,033,660)						$ (817,156)		$ (33,341)		$ (183,164)
Conversion of stock to voting/non-voting common stock, shares										71,013
Conversion of stock to voting/non-voting common stock										$ 1
Issuance of Class C voting common stock for settlement of restricted stock units, net, shares														6,536
Shares issued in connection with exercise of stock options under stock-based compensation plans, shares										3,291		1,389
Shares issued in connection with exercise of stock options under stock-based compensation plans		16,567
Issuance of Class A non-voting common stock in connection with acquisitions and divestitures		6,913
Issuance of voting/non-voting common stock for vesting of restricted stock units and restricted stock awards, shares										86,519		300
Issuance of voting/non-voting common stock for vesting of restricted stock units and restricted stock awards, net										$ 1
Equity component of convertible senior notes, net		377,432
Purchase of capped calls		(102,086)
Other comprehensive income (loss)	$ (2,574)			(2,574)
Balance, end of period, shares at Dec. 31, 2019	1,415,796									1,160,127		24,522		231,147
Balance, end of period at Dec. 31, 2019	$ 2,259,913	$ 9,205,256	(6,945,930)	$ 573						$ 12				$ 2
Cumulative-effect adjustment from accounting changes			$ 308

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies Snap Inc. is a camera company. Snap Inc. (“we,” “our,” or “us”) was formed as Future Freshman, LLC, a California limited liability company, in 2010. We changed our name to Toyopa Group, LLC in 2011, incorporated as Snapchat, Inc., a Delaware corporation, in 2012, and changed our name to Snap Inc. in 2016. Snap Inc. is headquartered in Santa Monica, California. Our flagship product, Snapchat, is a camera application that was created to help people communicate through short videos and images called “Snaps.” Basis of Presentation Our consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). Our consolidated financial statements include the accounts of Snap Inc. and our wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Our fiscal year ends on December 31. Initial Public Offering In March 2017, we completed our initial public offering (“IPO”) in which we issued and sold 160.3 million shares of Class A common stock, inclusive of the over-allotment, at an initial public offering price of $17.00 per share and excluding shares sold in the IPO by certain of our existing stockholders. We received net proceeds of $2.6 billion after deducting underwriting discounts and commissions of $68.1 million and other offering expenses of $14.7 million. On the closing of the IPO, all shares of our then-outstanding convertible preferred stock other than Series FP preferred stock automatically converted into an aggregate of 246.8 million shares of Class B common stock and all outstanding shares of Series FP preferred stock automatically converted into 215.9 million shares of Class C common stock. Following the IPO, we have three classes of authorized common stock – Class A common stock, Class B common stock, and Class C common stock. Restricted stock units (“RSUs”) granted to employees before January 1, 2017 (“Pre-2017 RSUs”) included both service-based and performance conditions to vest in the underlying common stock. The performance condition related to these awards was satisfied on the effectiveness of the registration statement for our IPO, which occurred in March 2017. On the effectiveness of the registration statement for our IPO, we recognized $1.3 billion of stock-based compensation expense for Pre-2017 RSUs. To meet the related tax withholding requirements, we withheld 12.1 million of the 26.7 million shares of common stock issued. Based on the initial public offering price of $17.00 per share, the tax withholding obligation for these vested Pre-2017 RSUs was $206.6 million. In addition, on the closing of the IPO, our Chief Executive Officer (“CEO”) received an RSU award (“CEO award”) for 37.4 million shares of Series FP preferred stock, which automatically converted into an equivalent number of shares of Class C common stock on the closing of the IPO. The CEO award represented 3.0% of all outstanding shares on the closing of the IPO, including shares sold by us in the IPO and vested stock options and RSUs, net of shares withheld to satisfy tax withholding obligations, on the closing of the IPO. The CEO award vested immediately on the closing of the IPO, and such shares are being delivered to the CEO in quarterly installments over three years which began in November 2017. There is no continuing service requirement for our CEO. The stock-based compensation expense recognized related to the CEO award was $636.6 million, which is based on the vesting of 37.4 million shares of Class C common stock on the closing of the IPO, at the initial public offering price of $17.00 per share. As of December 31, 2019 and 2018, in accordance with terms of the CEO award, 28.0 million and 15.6 million shares of Class C common stock were issued, respectively. At December 31, 2019 and 2018, 9.4 million and 21.8 million shares of Class C common stock were to be issued in future periods in equal quarterly installments through 2020, respectively. The future tax benefits on settlement of the above RSUs is not expected to be material as currently we have established valuation allowances to reduce our net deferred tax assets to the amount that is more likely than not to be realized. The majority of the future tax benefits that arise on settlement of the above RSUs are in jurisdictions for which our net deferred tax assets have a full valuation allowance. Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the consolidated financial statements. Management’s estimates are based on historical information available as of the date of the consolidated financial statements and various other assumptions that we believe are reasonable under the circumstances. Actual results could differ from those estimates. Key estimates relate primarily to determining the fair value of assets and liabilities assumed in business combinations, evaluation of contingencies, uncertain tax positions, excess inventory reserves, lease exit charges, forfeiture rate, the fair value of convertible senior notes, and the fair value of stock-based awards. On an ongoing basis, management evaluates our estimates compared to historical experience and trends, which form the basis for making judgments about the carrying value of assets and liabilities. Concentrations of Business Risk We currently use both Google Cloud and Amazon Web Services for our hosting requirements. A disruption or loss of service from one or both of these partners could seriously harm our ability to operate. Although we believe there are other qualified providers that can provide these services, a transition to a new provider could create a significant disruption to our business and negatively impact our consolidated financial statements. Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash, cash equivalents, marketable securities, and accounts receivable. We maintain cash deposits, cash equivalent balances, and marketable securities with several financial institutions. Cash and cash equivalents may be withdrawn or redeemed on demand. We believe that the financial institutions that hold our cash and cash equivalents are financially sound and, accordingly, minimal credit risk exists with respect to these balances. We also maintain investments in U.S. government debt and agency securities, corporate debt securities, certificates of deposit, and commercial paper that carry high credit ratings and accordingly, minimal credit risk exists with respect to these balances. We extend credit to our customers based on an evaluation of their ability to pay amounts due under contractual arrangement and generally do not obtain or require collateral. Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to receive in exchange for those goods or services. See Note 2 for additional information. Cost of Revenue Cost of revenue includes payments for content and third party selling costs, referred to as revenue share. Under some of these arrangements, we pay a portion of the fees we receive from the advertisers for Snap Ads that are displayed within partner content on Snapchat. Revenue-share costs were $174.7 million, $120.3 million, and $96.3 million for the years ended December 31, 2019, 2018, and 2017, respectively. In addition, cost of revenue consists of expenses associated with infrastructure costs of the Snapchat mobile application, advertising measurement services, and personnel-related costs. Cost of revenue includes facilities and other supporting overhead costs, including depreciation and amortization, and inventory costs for Spectacles. Advertising Advertising costs are expensed as incurred and were $31.4 million, $11.3 million, and $10.9 million for the years ended December 31, 2019, 2018, and 2017, respectively. Stock-based Compensation We measure and recognize compensation expense for stock-based payment awards, including stock options, RSUs, and restricted stock awards (“RSAs”) granted to employees, directors, and advisors, based on the grant date fair value of the awards. The grant date fair value of stock options is estimated using a Black-Scholes option pricing model. The fair value of stock-based compensation for stock options is recognized on a straight-line basis, net of estimated forfeitures, over the period during which services are provided in exchange for the award. The grant date fair value of RSUs and RSAs is estimated based on the fair value of our underlying common stock. Pre-2017 RSUs contained both service-based and performance conditions to vest in the underlying common stock. The service-based condition criteria is generally met 10% after the first year of service, 20% over the second year, 30% over the third year, and 40% over the fourth year. The performance condition related to these awards was satisfied on the effectiveness of the registration statement for our IPO, which occurred in March 2017. Awards which contain both service-based and performance conditions were recognized using the accelerated attribution method once the performance condition was probable of occurring. All RSUs granted after December 31, 2016 vest on the satisfaction of only a service-based condition (“Post-2017 RSUs”). The service condition for RSUs granted prior to February 2018 is generally satisfied over four years, 10% after the first year of service, 20% over the second year, 30% over the third year, and 40% over the fourth year. In limited instances, we have issued Post-2017 RSUs with vesting periods in excess of four years. The service condition for RSUs and RSAs granted after February 2018 is generally satisfied in equal monthly or quarterly installments over four years. For these awards, we recognize stock-based compensation expense on a straight-line basis over the vesting period. Stock-based compensation expense recognized for all periods presented is based on awards that are expected to vest, including an estimate of forfeitures. We estimate the forfeiture rate using historical forfeitures of equity awards and other expected changes in facts and circumstances, if any. A modification of the terms of a stock-based award is treated as an exchange of the original award for a new award with total compensation cost equal to the grant-date fair value of the original award plus the incremental value of the modification to the award. Income Taxes We are subject to income taxes in the United States and numerous foreign jurisdictions. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the deferred tax asset or liability is expected to be realized or settled. In evaluating our ability to recover deferred tax assets, we consider all available positive and negative evidence, including historical operating results, ongoing tax planning, and forecasts of future taxable income on a jurisdiction-by-jurisdiction basis. Based on the level of historical losses, we have established a valuation allowance to reduce our net deferred tax assets to the amount that is more likely than not to be realized. We recognize a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in our consolidated financial statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized. We recognize interest and penalties associated with tax matters as part of the income tax provision and include accrued interest and penalties with the related income tax liability on our consolidated balance sheets. Currency Translation and Remeasurement The functional currency of the majority of our foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities denominated in a foreign currency are remeasured into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are remeasured at the average exchange rates during the period. Equity transactions and other non-monetary assets are remeasured using historical exchange rates. Foreign currency transaction gains and losses are recorded in other income (expense), net on our consolidated statement of operations. For those foreign subsidiaries where the local currency is the functional currency, adjustments to translate those statements into U.S. dollars are recorded in accumulated other comprehensive income (loss) in stockholders’ equity. Cash and Cash Equivalents Cash and cash equivalents consist of highly liquid investments with original maturities of 90 days or less from the date of purchase. Restricted Cash We are required to maintain restricted cash deposits to back letters of credit for certain property leases. These funds are restricted and have been classified in other assets on our consolidated balance sheets due to the nature of restriction. At December 31, 2019 and 2018, restricted cash balances were immaterial. Marketable Securities We hold investments in marketable securities consisting of U.S. government securities, U.S. government agency securities, corporate debt securities, certificates of deposit, and commercial paper. We classify our marketable securities as available-for-sale investments in our current assets because they represent investments available for current operations. Our available-for-sale investments are carried at fair value with any unrealized gains and losses, included in accumulated other comprehensive (loss) income in stockholders’ equity. We determine gains or losses on the sale or maturities of marketable securities using the specific identification method and these gains or losses are recorded in other income (expense), net in our consolidated statements of operations. Unrealized losses are recorded in other income (expense), net when a decline in fair value is determined to be other than temporary. Inventory Prepaid expenses and other current assets include our Spectacles inventory, which consists of finished goods purchased from contract manufacturers. Inventory is stated at the lower of cost or market on a weighted-average cost basis. Inventories are written down for estimated obsolescence or excess inventory equal to the difference between the cost of inventory and estimated market value. Adjustments to reduce inventory to net realizable value are recognized in cost of revenue. Non-Marketable Investments Our investments in privately-held companies are primarily non-marketable equity securities without readily determinable fair values. We adjust the carrying value of non-marketable equity securities to fair value upon observable transactions for identical or similar investments of the same issuer or upon impairment. Any adjustments to carrying value of these investments are recorded in other income (expense) net in our consolidated statements of operations. When we exercise significant influence over, but do not control the investee, such non-marketable investments are accounted for using the equity method. Under the equity method of accounting, we record our share of the results of the investments within other income (expense), net in our consolidated statements of operations. Fair Value Measurements Certain financial instruments are required to be recorded at fair value. Other financial instruments, including cash and cash equivalents and restricted cash, are recorded at cost, which approximates fair value. Additionally, accounts receivable, accounts payable, and accrued expenses approximate fair value because of the short-term nature of these financial instruments. Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at the invoiced amount less any allowance for doubtful accounts to reserve for potentially uncollectible receivables. To determine the amount of the allowance, we make judgments about the creditworthiness of customers based on ongoing credit evaluation and historical experience. At December 31, 2019 and 2018, the allowance for doubtful accounts was immaterial. Property and Equipment Property and equipment are stated at cost, less accumulated depreciation. We compute depreciation using the straight-line method over the estimated useful lives of the assets, which is generally three years for computer hardware and software, five years for furniture and equipment, and over the shorter of lease term or useful life of the assets for leasehold improvements. Buildings are depreciated over a useful life ranging from 25 to 45 years. Maintenance and repairs are expensed as incurred. Leases We have various non-cancelable lease agreements for certain of our offices. Leases are recorded as operating lease right-of-use assets and operating lease liabilities on the consolidated balance sheets. Leases with an initial term of twelve months or less are not recorded on the consolidated balance sheets. We recognize rent expense on a straight-line basis over the lease term. Software Development Costs Software development costs include costs to develop software to be used to meet internal needs and applications used to deliver our services. We capitalize development costs related to these software applications once the preliminary project stage is complete and it is probable that the project will be completed and the software will be used to perform the function intended. Costs capitalized for developing such software applications were not material for the periods presented. Segments Our CEO is our chief operating decision maker. We have determined that we have a single operating segment. Our CEO evaluates performance and makes operating decisions about allocating resources based on financial data presented on a consolidated basis accompanied by disaggregated information about revenue by geographic region. Business Combinations We include the results of operations of the businesses that we acquire from the date of acquisition. We determine the fair value of the assets acquired and liabilities assumed based on their estimated fair values as of the respective date of acquisition. The excess purchase price over the fair values of identifiable assets and liabilities is recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires management to use significant judgment and estimates including the selection of valuation methodologies, estimates of future revenue and cash flows, discount rates, and selection of comparable companies. Our estimates of fair value are based on 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, not to exceed one year from the date of acquisition, we may record adjustments to the assets acquired and liabilities assumed, with a corresponding offset to goodwill. At the conclusion of the measurement period, any subsequent adjustments are reflected in the consolidated statements of operations. When we issue payments or grants of equity to selling stockholders in connection with an acquisition, we evaluate whether the payments or awards are compensatory. This evaluation includes whether cash payments or stock award vesting is contingent on the continued employment of the selling stockholder beyond the acquisition date. If continued employment is required for the cash to be paid or stock awards to vest, the award is treated as compensation for post-acquisition services and is recognized as compensation expense. Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expenses in our consolidated statements of operations. Goodwill Goodwill represents the excess of the purchase price over the fair value of net assets acquired in a business combination. We test goodwill for impairment at least annually, in the fourth quarter, or whenever events or changes in circumstances indicate that goodwill might be impaired. For all periods presented, we had a single In testing for goodwill impairment, we first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, we determine it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if we conclude otherwise, we perform the first of a two-step impairment test. The first step compares the estimated fair value of a reporting unit to its book value, including goodwill. If the estimated fair value exceeds book value, goodwill is considered not to be impaired and no additional steps are necessary. However, if the fair value of the reporting unit is less than book value, then under the second step the carrying amount of the goodwill is compared to its implied fair value. There were no impairment charges in any of the periods presented. Intangible Assets Intangible assets are carried at cost and amortized on a straight-line basis over their estimated useful lives. We determine the appropriate useful life of our intangible assets by measuring the expected cash flows of acquired assets. The estimated useful lives of intangible assets are as follows: Intangible Asset Estimated Useful Life Domain names 5 Years Trademarks 1 to 5 Years Acquired developed technology 4 to 7 Years Customer relationships 2 to 5 Years Patents 3 to 11 Years Impairment of Long-Lived Assets We evaluate recoverability of our property and equipment and intangible assets, excluding goodwill, when events or changes indicate the carrying amount of an asset may not be recoverable. Events and changes in circumstances considered in determining whether the carrying value of long-lived assets may not be recoverable include: significant changes in performance relative to expected operating results; significant changes in asset use; and significant negative industry or economic trends and changes in our business strategy. Recoverability of these assets is measured by comparison of their carrying amount to future undiscounted cash flows to be generated. If impairment is indicated based on a comparison of the assets’ carrying values and the undiscounted cash flows, the impairment loss is measured as the amount by which the carrying amount of the assets exceeds the fair value of the assets. We determined that there were no events or changes in circumstances that indicated our long-lived assets were impaired during any of the periods presented. Legal Contingencies For legal contingencies, we accrue a liability for an estimated loss if the potential loss from any claim or legal proceeding is considered probable, and the amount can be reasonably estimated. Legal fees and expenses are expensed as incurred. Convertible Notes We account for the Convertible Notes as separate liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component, representing the conversion option, is calculated by deducting the fair value of the liability component from the total principal of the Convertible Notes. This amount represents a debt discount which is amortized to interest expense over the term of the Convertible Notes using the effective interest rate method, which maintains a constant rate of interest expense based on the increasing carrying value of the debt. Recent Accounting Pronouncements In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Simplifying the Accounting for Income Taxes, In August 2018, the FASB issued ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Codification Improvements to Topic 326, Financial Instruments—Credit Losses In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)

Revenue

Revenue	12 Months Ended
	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenue	2. Revenue Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to receive in exchange for those goods or services. We determine collectability by performing ongoing credit evaluations and monitoring customer accounts receivable balances. Sales taxes, including value added taxes, are excluded from reported revenue. We generate substantially all of our revenues by offering various advertising products on Snapchat, which include Snap Ads and Sponsored Creative Tools, and measurement services, referred to as advertising revenue. Sponsored Creative Tools include Sponsored Geofilters and Sponsored Lenses. Sponsored Geofilters allow users to interact with an advertiser’s brand by enabling stylized brand artwork to be overlaid on a Snap. Sponsored Lenses allow users to interact with an advertiser’s brand by enabling branded augmented reality experiences. The substantial majority of advertising revenue is generated from the display of advertisements on Snapchat through contractual agreements that are either on a fixed fee basis over a period of time or based on the number of advertising impressions delivered. Revenue related to agreements based on the number of impressions delivered is recognized when the advertisement is displayed. Revenue related to fixed fee arrangements is recognized ratably over the service period, typically less than 30 days in duration, and such arrangements do not contain minimum impression guarantees. In determining whether an arrangement exists, we ensure that an agreement, such as an insertion order or self-serve terms, have been fully executed or accepted electronically. We sell advertising directly to advertisers (“Snap-sold” revenue) and certain partners that provide content on Snapchat (“content partners”) also sell directly to advertisers (“partner-sold” revenue). Snap Ads may be subject to revenue sharing agreements between us and our content partners. Our Sponsored Creative Tools and measurement services are only Snap-sold and are not subject to revenue sharing arrangements. Snap-sold revenue is recognized based on the gross amount that we charge the advertiser. Partner-sold revenue is recognized based on the net amount of revenue to be received from the content partners. We recognize Snap-sold revenue on a gross basis predominantly because we are the primary obligor responsible for fulfilling advertisement delivery, including the acceptability of the services delivered. For Snap-sold advertising, we enter into contractual arrangements directly with advertisers. We are directly responsible for the fulfillment of the contractual terms and any remedy for issues with such fulfillment. For Snap-sold revenue, we also have latitude in establishing the selling price with the advertiser, as we sell advertisements at a rate determined at our sole discretion. We recognize partner-sold revenue on a net basis predominantly because the content partner, and not Snap, is the primary obligor responsible for fulfillment, including the acceptability of the services delivered. In partner-sold advertising arrangements, the content partner has a direct contractual relationship with the advertiser. There is no contractual relationship between us and the advertiser for partner-sold transactions. When a content partner sells advertisements, the content partner is responsible for fulfilling the advertisements, and accordingly, we have determined the content partner is the primary obligor. Additionally, we do not have any latitude in establishing the price with the advertiser for partner-sold advertising. The content partner may sell advertisements at a rate determined at its sole discretion. For the periods presented, partner-sold revenue was not material. We also generate revenue from sales of our hardware product, Spectacles. For the periods presented, revenue from the sales of Spectacles was not material. The following table represents our revenue disaggregated by geography based on the billing address of the advertising customer: Year Ended December 31, 2019 2018 2017 (in thousands) Revenue: North America (1) (2) $ 1,068,108 $ 780,992 $ 675,402 Europe (3) 299,913 183,077 98,047 Rest of world 347,513 216,377 51,500 Total revenue $ 1,715,534 $ 1,180,446 $ 824,949 (1) North America includes Mexico, the Caribbean, and Central America. (2) United States revenue was $1.0 billion, $752.9 million, and $643.0 million for the years ended December 31, 2019, 2018, and 2017, respectively. (3) Europe includes Russia and Turkey.

Net Loss per Share

Net Loss per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Net Loss per Share	3. Net Loss per Share We compute net loss per share using the two-class method required for multiple classes of common stock and participating securities. Our participating securities include any shares issued on the early exercise of stock options subject to repurchase because holders of such shares have non-forfeitable dividend rights in the event a dividend is paid on common stock. In March 2017, we completed our IPO in which we issued and sold 160.3 million shares of Class A common stock, inclusive of the over-allotment, at an initial public offering price of $17.00 per share and excluding shares sold in the IPO by certain of our existing stockholders. We received net proceeds of $2.6 billion after deducting underwriting discounts and commissions of $68.1 million and other offering expenses of $14.7 million. On the closing of the IPO, all shares of our then-outstanding convertible preferred stock other than Series FP preferred stock automatically converted into an aggregate of 246.8 million shares of Class B common stock and all outstanding shares of Series FP preferred stock automatically converted into 215.9 million shares of Class C common stock. Following the IPO, we have three classes of authorized common stock – Class A common stock, Class B common stock, and Class C common stock. Before our IPO, our participating securities also included Series D, E, F, and FP preferred stock and Series A, A-1, B, and C convertible preferred stock. The rights, including the liquidation and dividend rights, of the Class A common stock and Class B common stock, and the Series D, E, F, and FP preferred stock were substantially identical, other than voting rights. Accordingly, the Class A common stock, Class B common stock, and the Series D, E, F, and FP preferred stock shared equally in our net losses. The holders of early exercised shares subject to repurchase and the holders of Series A, A-1, B, and C convertible preferred stock did not have a contractual obligation to share in our losses, and as a result our net losses were not allocated to these participating securities. In connection with our IPO, our Series D, E, and F preferred stock converted on a one-to-one basis into Class B common stock, and our Series FP preferred stock converted on a one-to-one basis into Class C common stock. The liquidation and dividend rights of the aforementioned preferred series are substantially identical to the rights of the common classes into which they converted. Accordingly, we have presented the Series D, E, and F preferred stock outstanding before the IPO together with the Class B common stock, and the Series FP preferred stock outstanding before the IPO together with the Class C common stock for purposes of calculating net loss per share. The prior period presentation has been adjusted to conform to our current period presentation. Also in connection with our IPO, our Series A, A-1, B, and C preferred stock converted on a one-to-one basis into Class B common stock. The shares of Class B common stock that resulted from the conversion of the Series A, A-1, B, and C preferred stock are weighted in the denominator of net loss per share for Class B common stock for the portion of the time outstanding subsequent to our IPO. Basic net loss per share is computed by dividing net loss attributable to each class of stockholders by the weighted-average number of shares of stock outstanding during the period. Vested RSUs that have not been settled, including the vested CEO award, and RSAs for which the risk of forfeiture has lapsed have been included in the appropriate common share class used to calculate basic net loss per share. For the calculation of diluted net loss per share, net loss per share attributable to common stockholders for basic net loss per share is adjusted by the effect of dilutive securities, including awards under our equity compensation plans. Diluted net loss per share attributable to common stockholders is computed by dividing the resulting net loss attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding. We use the if-converted method for calculating any potential dilutive effect of the Convertible Notes on diluted net loss per share, subject to meeting the criteria for using the treasury stock method in future periods. The Convertible Notes would have a dilutive impact on net income per share when the average market price of Class A common stock for a given period exceeds the conversion price of the Convertible Notes. For the periods presented, our potentially dilutive shares relating to stock options, RSUs, RSAs, Convertible Notes, and common stock subject to repurchase were not included in the computation of diluted net loss per share as the effect of including these shares in the calculation would have been anti-dilutive. The numerators and denominators of the basic and diluted net loss per share computations for our common stock are calculated as follows for the years ended December 31, 2019, 2018, and 2017: Year Ended December 31, 2019 2018 2017 (in thousands, except per share data) Class A Common Class B Common Class C Common Class A Common Class B Common Class C Common Class A Common (3) Class B Common (1) Class C Common (2) Numerator: Net loss $ (817,156 ) $ (33,341 ) $ (183,164 ) $ (921,235 ) $ (94,897 ) $ (239,779 ) $ (2,169,120 ) $ (548,098 ) $ (727,848 ) Net loss attributable to common stockholders $ (817,156 ) $ (33,341 ) $ (183,164 ) $ (921,235 ) $ (94,897 ) $ (239,779 ) $ (2,169,120 ) $ (548,098 ) $ (727,848 ) Denominator: Basic shares: Weighted-average common shares - Basic 1,087,366 44,366 243,730 953,992 98,271 248,305 734,203 185,520 246,362 Diluted shares: Weighted-average common shares - Diluted 1,087,366 44,366 243,730 953,992 98,271 248,305 734,203 185,520 246,362 Net loss per share attributable to common stockholders: Basic $ (0.75 ) $ (0.75 ) $ (0.75 ) $ (0.97 ) $ (0.97 ) $ (0.97 ) $ (2.95 ) $ (2.95 ) $ (2.95 ) Diluted $ (0.75 ) $ (0.75 ) $ (0.75 ) $ (0.97 ) $ (0.97 ) $ (0.97 ) $ (2.95 ) $ (2.95 ) $ (2.95 ) (1) Included in the Class B common stock, for all periods presented, is Series D, E, and F preferred stock, which automatically converted to Class B common stock on the closing of the IPO. Series A, A-1, B, and C preferred stock are included in Class B common stock on the automatic conversion of such shares to 163.0 million shares of Class B common stock on the closing of our IPO. (2) Included in the Class C common stock, for all periods presented, is Series FP preferred stock which automatically converted to Class C common stock on the closing of the IPO. Additionally, 37.4 million shares of Class C common stock related to the CEO award are included in Class C common stock on the closing of our IPO. (3) Class A common stock includes the issuance of 160.3 million shares of Class A common stock issued by us in connection with our IPO. The following potentially dilutive shares were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented: Year Ended December 31, 2019 2018 2017 (in thousands) Stock options 10,262 16,291 32,596 Unvested RSUs and RSAs 148,797 158,264 163,796 Convertible Notes (if-converted) 55,468 — —

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stockholders' Equity	4. Stockholders’ Equity Common Stock As of December 31, 2019, we are authorized to issue 3,000,000,000 shares of Class A nonvoting common stock, 700,000,000 shares of Class B voting common stock, and 260,887,848 shares of Class C voting common stock, each with a par value of $0.00001 per share. Class A common stock has no voting rights, Class B common stock is entitled to one vote per share, and Class C common stock is entitled to ten votes per share. Shares of our Class B common stock are convertible into an equivalent number of shares of our Class A common stock and generally convert into shares of our Class A common stock upon transfer. Shares of our Class C common stock are convertible into an equivalent number of shares of our Class B common stock and generally convert into shares of our Class B common stock upon transfer. Any dividends paid to the holders of the Class A common stock, Class B common stock, and Class C common stock will be paid on a pro rata basis. For the year ended December 31, 2019, we did not declare any dividends. On a liquidation event, as defined in our amended and restated certificate of incorporation, any distribution to common stockholders is made on a pro rata basis to the holders of the Class A common stock, Class B common stock, and Class C common stock. As of December 31, 2019, there were 1,160,127,014 shares, 24,521,607 shares, and 231,147,476 shares of Class A common stock, Class B common stock, and Class C common stock, respectively, issued and outstanding. Stock-based Compensation Plans We maintain three share-based employee compensation plans: the 2017 Equity Incentive Plan (“2017 Plan”), the 2014 Equity Incentive Plan (“2014 Plan”), and the 2012 Equity Incentive Plan (“2012 Plan”, and collectively with the 2017 Plan and the 2014 Plan, the “Stock Plans”). In January 2017, our board of directors adopted the 2017 Plan, and in February 2017 our stockholders approved the 2017 Plan, effective on March 1, 2017, which serves as the successor to the 2014 Plan and 2012 Plan and provides for the grant of incentive stock options to employees, including employees of any parent or subsidiary, and for the grant of nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance stock awards, performance cash awards, and other forms of stock awards to employees, directors, and consultants, including employees and consultants of our affiliates. We do not expect to grant any additional awards under the 2014 Plan or 2012 Plan as of the effective date of the 2017 Plan, other than awards for up to 2,500,000 shares of Class A common stock to our employees and consultants in France under the 2014 Plan. Outstanding awards under the 2014 Plan and 2012 Plan continue to be subject to the terms and conditions of the 2014 Plan and 2012 Plan, respectively. Shares available for grant under the 2014 Plan and 2012 Plan, which were reserved but not issued or subject to outstanding awards under the 2014 Plan or 2012 Plan, respectively, as of the effective date of the 2017 Plan, were added to the reserves of the 2017 Plan. We initially reserved 87,270,108 shares of our Class A common stock for future issuance under the 2017 Plan. An additional number of shares of Class A common stock will be added to the 2017 Plan equal to (i) 96,993,064 shares of Class A common stock reserved for future issuance pursuant to outstanding stock options and unvested RSUs under the 2014 Plan, (ii) 37,228,865 shares of Class A common stock issuable on conversion of Class B common stock underlying stock options and unvested RSUs outstanding under the 2012 Plan, (iii) 17,858,235 shares of Class A common stock that were reserved for issuance under the 2014 Plan as of the date the 2017 Plan became effective, (iv) 11,004,580 shares of Class A common stock issuable on conversion of Class B common stock that were reserved for issuance under the 2012 Plan as of the date the 2017 Plan became effective, and (v) a maximum of 86,737,997 shares of Class A common stock that will be added pursuant to the following sentence. With respect to each share that returns to the 2017 Plan pursuant to (i) and (ii) of the prior sentence that was associated with an award that was outstanding under the 2014 Plan and 2012 Plan as of October 31, 2016, an additional share of Class A common stock will be added to the share reserve of the 2017 Plan, up to a maximum of 86,737,997 shares 2017 Employee Stock Purchase Plan In January 2017, our board of directors adopted the 2017 Employee Stock Purchase Plan (“2017 ESPP”). Our stockholders approved the 2017 ESPP in February 2017. The 2017 ESPP became effective in connection with the IPO. A total of 16,484,690 shares of Class A common stock were initially reserved for issuance under the 2017 ESPP. No shares of our Class A common stock have been issued or offered under the 2017 ESPP. The number of shares of our Class A common stock reserved for issuance will automatically increase on January 1st of each calendar year, beginning on January 1, 2018 through January 1, 2027, by the lesser of (i) 1.0% of the total number of shares of our common stock outstanding on the last day of the calendar month before the date of the automatic increase, and (ii) 15,000,000 shares; provided that before the date of any such increase, our board of directors may determine that such increase will be less than the amount set forth in clauses (i) and (ii). Restricted Stock Units The following table summarizes the RSU award activity during the year ended December 31, 2019: Class A Outstanding RSUs Class B Outstanding RSUs Weighted- Average Grant Date Fair Value per RSU (in thousands, except per share data) Unvested at December 31, 2018 149,638 492 $ 13.34 Granted 89,582 — $ 11.00 Vested (76,983 ) (490 ) $ 12.10 Forfeited (21,622 ) (2 ) $ 13.15 Unvested at December 31, 2019 140,615 — $ 12.57 The total fair value of RSUs vested during the years ended December 31, 2019, 2018, and 2017 was $937.2 million, $884.1 million, and $966.0 million, respectively. Total unrecognized compensation cost related to Pre-2017 RSUs was $34.5 million as of December 31, 2019 and is expected to be recognized over a weighted-average period of 0.8 years. Total unrecognized compensation cost related to Post-2017 RSUs was $1.4 billion as of December 31, 2019 and is expected to be recognized over a weighted-average period of 2.9 years. Additionally, we have 9.4 million and 22.4 million RSUs that are vested but have not yet settled as of December 31, 2019 and December 31, 2018, respectively. These RSUs are primarily related to the CEO award. Restricted Stock Awards The following table summarizes the RSA activity during the year ended December 31, 2019: Class A Outstanding RSAs Weighted- Average Grant Date Fair Value per RSA (in thousands, except per share data) Unvested at December 31, 2018 8,134 $ 7.51 Granted 3,975 $ 12.61 Vested (2,778 ) $ 9.90 Forfeited (1,149 ) $ 5.85 Unvested at December 31, 2019 8,182 $ 9.42 The total fair value of RSAs vested during the years ended December 31, 2019, 2018 and 2017 was $27.5 million, $6.3 million, and $1.6 million, respectively. Total unrecognized compensation cost related to RSAs was $74.2 million as of December 31, 2019 and is expected to be recognized over a weighted-average period of 3.3 years. Stock Options The following table summarizes the stock option award activity under the Stock Plans during the year ended December 31, 2019: Class A Number of Shares Class B Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) (in thousands, except per share data) Outstanding at December 31, 2018 13,322 2,969 $ 7.83 6.41 $ 34,567 Granted 118 — $ 14.69 — $ — Exercised (3,291 ) (1,389 ) $ 3.53 — $ — Forfeited (1,437 ) (30 ) $ 13.87 — $ — Outstanding at December 31, 2019 8,712 1,550 $ 9.00 5.59 $ 75,460 Exercisable at December 31, 2019 6,053 1,550 $ 8.00 4.65 $ 63,445 Vested and expected to vest at December 31, 2019 8,508 1,550 $ 8.91 5.54 $ 74,825 (1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing market price of our Class A common stock as of December 31, 2018 and December 31, 2019, respectively. The weighted-average fair value of stock options granted during the years ended December 31, 2019 and 2018 was $14.69 and $6.99 per share, respectively. The expense is estimated based on the option’s fair value as calculated by the Black-Scholes option pricing model. Stock-based compensation expense for stock options was not material in the years ended December 31, 2019, 2018, and 2017. Total unrecognized compensation cost related to unvested stock options was $17.7 million as of December 31, 2019 The total grant date fair value of stock options that vested in the years ended December 31, 2019, 2018, and 2017 was $23.3 million, $24.8 million, and $58.6 million, respectively. The intrinsic value of stock options exercised in the years ended December 31, 2019, 2018, and 2017 was $44.0 million, $289.1 million, and $276.5 million, respectively. Stock-Based Compensation Expense Total stock-based compensation expense by function was as follows: Year Ended December 31, 2019 2018 2017 (in thousands) Cost of revenue $ 6,365 $ 4,393 $ 26,071 Research and development 464,639 340,533 1,154,430 Sales and marketing 93,355 84,059 236,474 General and administrative 121,654 109,226 1,222,920 Total $ 686,013 $ 538,211 $ 2,639,895

Business Acquisitions and Dives

Business Acquisitions and Divestitures	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Acquisitions and Divestitures	5. Business Acquisitions and Divestitures 2019 Acquisitions and Divestiture AI Factory, Inc. In December 2019, we acquired the remaining ownership interest in AI Factory, Inc. (“AI Factory”), a content and technology company. Prior to the acquisition, we owned a minority interest in the company. The purpose of the acquisition was to enhance the functionality of our platform. The acquisition date fair value of AI Factory was $128.1 million, which primarily represents current and future cash consideration payments to sellers, as well as the $13.5 million estimated fair value of our original minority interest. We recognized the change in pre-acquisition fair value of our original minority interest as a gain in Other income (expense), net on the consolidated statement of operations. The allocation of acquisition date fair value is preliminary and is subject to additional information related to the assets and liabilities that existed as of the acquisition date. The preliminary allocation of acquisition date fair value is estimated as follows: Total (in thousands) Technology $ 16,000 Goodwill 110,734 Other assets acquired and liabilities assumed, net 1,353 Total $ 128,087 The goodwill amount represents synergies related to our existing platform expected to be realized from this business combination and assembled workforce. The associated goodwill and intangible assets are not deductible for tax purposes. Placed, LLC In June 2019, we divested our membership interest in Placed, LLC (“Placed”), a location-based measurement services company, to Foursquare Labs, Inc. (“Foursquare”). The total cash consideration received was $77.8 million, which includes amounts paid for severance and equity compensation. $66.9 million represents purchase consideration and we recognized a net gain on divestiture of $39.9 million, which is included in other income (expense), net, on our consolidated statements of operations. The operating results of Placed were not material to our consolidated revenue or consolidated operating loss for all periods presented. We determined that Placed did not meet the criteria to be classified as discontinued operations. Placed assets and liabilities on completion of the divestiture were as follows: Total (in thousands) Trademarks, net $ 1,052 Technology, net 14,193 Customer relationships, net 5,246 Goodwill 2,682 Other assets and liabilities, net 3,827 Total $ 27,000 Other Acquisitions In the fourth quarter of 2019, we acquired a business to enhance our existing platform, technology, and workforce. The purchase consideration was $34.0 million of which $23.5 million was allocated to goodwill and the remainder primarily to identifiable intangible assets. The goodwill amount represents synergies related to our existing platform expected to be realized from this business combination and assembled workforce. The associated goodwill and intangible assets are deductible for tax purposes. Additional Information on 2019 Acquisitions For all acquisitions in 2019, we will grant a combined $71.3 million in the form of RSUs to certain continuing employees in exchange for future service. In addition, unaudited pro forma results of operations assuming the above acquisitions had taken place at the beginning of each period are not provided because the historical operating results of the acquired entities were not material and pro forma results would not be materially different from reported results for the periods presented. 2018 Acquisitions Acquisitions were not material for the year ended December 31, 2018. 2017 Acquisitions Placed, Inc. In July 2017, we acquired Placed (originally Placed, Inc.). The purpose of the acquisition was to enhance our measurement capabilities. The total consideration was $185.9 million, of which $139.6 million represents purchase consideration and includes $135.2 million in cash paid to sellers, $3.9 million for the fair value of assumed options, and $0.5 million of liabilities due to the sellers. The remaining $46.3 million of total consideration transferred represents compensation for future employment services. The allocation of the total purchase consideration for this acquisition is estimated as follows: Total (in thousands) Cash $ 6,919 Trademarks 2,700 Technology 22,400 Customer relationships 11,800 Goodwill 103,995 Net deferred tax liability (13,520 ) Other assets acquired and liabilities assumed, net 5,296 Total $ 139,590 The goodwill amount represents synergies related to our existing platform expected to be realized from this business combination and assembled workforce. The associated goodwill and intangible assets are not deductible for tax purposes. Zenly In May 2017, we acquired Zenly, a company that develops a location-based application that allows users to see where their friends are on a map. The purpose of the acquisition was to enhance the functionality of our platform. The total consideration paid was $213.3 million in cash, of which $196.1 million represents purchase consideration and includes $186.8 million in cash paid to the sellers and $9.3 million of liabilities due to the sellers. The remaining $17.2 million of total consideration transferred represents compensation for future employment services. The allocation of the total purchase consideration for this acquisition is estimated as follows: Total (in thousands) Cash $ 22,610 Technology 23,000 Goodwill 154,353 Net deferred tax liability (2,418 ) Other assets acquired and liabilities assumed, net (1,428 ) Total $ 196,117 The goodwill amount represents synergies related to our existing platform expected to be realized from this business combination and assembled workforce. The associated goodwill and intangible assets were not deductible for tax purposes as of the acquisition date . Other Acquisitions In March 2017, we acquired all outstanding shares of a company that operates a cloud hosted platform for building content online. The company was acquired to enhance the functionality of our platform. In June 2017, we acquired a component of a business from a social advertising software company that was integrated with our existing advertising platform and adds advertising tools to our advertising customers. In the fourth quarter 2017, we acquired several companies to enhance our existing platform, technology, and workforce. The total purchase consideration for these other acquisitions was $101.9 million, which included $95.3 million in cash and $6.6 million recorded in other liabilities on the consolidated balance sheets. The allocation of the total purchase consideration for the above other acquisitions in 2017 is as follows: Total (in thousands) Cash $ 1,701 Technology 49,325 Customer relationships 2,100 Goodwill 48,408 Net deferred tax liability (1,976 ) Other assets acquired and liabilities assumed, net 2,382 Total $ 101,940 The goodwill amount represents synergies related to our existing platform expected to be realized from these business combinations and assembled workforce. Of the technology intangible assets, customer relationships, and goodwill in the above table, $40.1 million, $1.6 million, and $30.3 million, is deductible for tax purposes, respectively. Additional Information on 2017 Acquisitions For all acquisitions in 2017, we provided for a combined $171.1 million in the form of RSUs and RSAs to certain continuing employees of the companies in exchange for future service. In addition, unaudited pro forma results of operations assuming the above acquisitions had taken place at the beginning of each period are not provided because the historical operating results of the acquired entities were not material and pro forma results would not be materially different from reported results for the periods presented.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. Goodwill and Intangible Assets The changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 were as follows: Goodwill (in thousands) Balance as of December 31, 2017 $ 639,882 Goodwill acquired 741 Foreign currency translation $ (8,253 ) Balance as of December 31, 2018 $ 632,370 Goodwill acquired 134,255 Goodwill divested (2,682 ) Foreign currency translation (2,790 ) Balance as of December 31, 2019 $ 761,153 Intangible assets consisted of the following: December 31, 2019 Weighted- Average Remaining Useful Life - Years Gross Carrying Amount Accumulated Amortization Net (in thousands, except years) Domain names 2.6 $ 5,414 $ 5,200 $ 214 Trademarks — 3,072 3,072 — Acquired developed technology 3.6 175,414 95,921 79,493 Customer relationships — 2,172 2,172 — Patents 5.9 19,710 7,296 12,414 $ 205,782 $ 113,661 $ 92,121 December 31, 2018 Weighted- Average Remaining Useful Life - Years Gross Carrying Amount Accumulated Amortization Net (in thousands except years) Domain names 1.6 $ 5,414 $ 4,283 $ 1,131 Trademarks 1.4 5,772 4,076 1,696 Acquired developed technology 3.8 179,791 78,729 101,062 Customer relationships 2.1 15,572 8,012 7,560 Patents 6.9 19,710 5,105 14,605 $ 226,259 $ 100,205 $ 126,054 Amortization of intangible assets for the years ended December 31, 2019, 2018, and 2017 was $33.4 million, $42.6 million, and $31.5 million, respectively. As of December 31, 2019, the estimated intangible asset amortization expense for the next five years and thereafter is as follows: Estimated Amortization (in thousands) Year ending December 31, 2020 $ 29,171 2021 23,545 2022 16,879 2023 14,396 2024 6,236 Thereafter 1,894 Total $ 92,121

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Long-Term Debt	7. Long-Term Debt Convertible Notes In August 2019, we entered into a purchase agreement with certain counterparties for the sale of an aggregate of $1.265 billion principal amount of the Convertible Notes in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The Convertible Notes consisted of a $1.1 billion initial placement and an over-allotment option that provided the initial purchasers of the Convertible Notes with the option to purchase an additional $165.0 million aggregate principal amount of the Convertible Notes, which was fully exercised. The Convertible Notes were issued pursuant to an Indenture, dated August 9, 2019 (the “Indenture”). The net proceeds from the issuance of the Convertible Notes were $ 1.15 billion, net of debt issuance costs and cash used to purchase the capped call transactions (“ Capped Call Transactions ”) discussed below. The Convertible Notes are unsecured and unsubordinated obligations. Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year. The Convertible Notes mature on August 1, 2026 unless repurchased, redeemed, or converted in accordance with the terms prior to such date. The Convertible Notes are convertible into cash, shares of our Class A common stock, or a combination of cash and shares of our Class A common stock, at our election, at an initial conversion rate of 43.8481 shares of Class A common stock per $1,000 principal amount of Convertible Notes, which is equivalent to an initial conversion price of approximately $22.81 (the “Conversion Price”) per share of our Class A common stock. The conversion rate is subject to customary adjustments for certain events as described in the Indenture. We may redeem for cash all or any portion of the Convertible Notes, at our option, on or after August 6, 2023 if the last reported sale price of our Class A common stock has been at least 130% of the Conversion Price then in effect for at least 20 trading days at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest. Holders of the Convertible Notes may convert all or a portion of their Convertible Notes at their option prior to May 1, 2026, in multiples of $1,000 principal amounts, only under the following circumstances: • during any calendar quarter commencing after December 31, 2019, if the last reported sale price of our Class A common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the preceding calendar quarter is greater than or equal to 130% of the applicable conversion price of the Convertible Notes on each such trading day; • during the five business day period after any ten consecutive trading day period in which the trading price per $1,000 principal amount of the Convertible Notes for each day of that ten consecutive trading day period was less than 98% of the product of the last reported sale price of our Class A common stock and the applicable conversion rate of the Convertible Notes on such trading day; • on a notice of redemption, in which case we may be required to increase the conversion rate for the Convertible Notes so surrendered for conversion in connection with such redemption notice; or • on the occurrence of specified corporate events. On or after May 1, 2026, the Convertible Notes are convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. Holders of the Convertible Notes who convert in connection with a make-whole fundamental change, as defined in the Indenture, or in connection with a redemption are entitled to an increase in the conversion rate. Additionally, in the event of a fundamental change, holders of the Convertible Notes may require us to repurchase all or a portion of the Convertible Notes at a price equal to 100% of the principal amount of Convertible Notes, plus any accrued and unpaid interest, including any additional interest. In accounting for the issuance of the Convertible Notes, we separated the Convertible Notes into liability and equity components. The carrying amount of the equity component was $381.5 million and was recorded as a debt discount, which is amortized to interest expense at an effective interest rate of 6.22%. We allocated $4.1 million of debt issuance costs to the equity component and the remaining debt issuance costs of $9.5 million were allocated to the liability component, which are amortized to interest expense under the effective interest rate method. The equity component of the Convertible Notes will not be remeasured as long as it continues to meet the conditions for equity classification. The Convertible Amount (in thousands) Liability: Principal $ 1,265,000 Unamortized debt discount and issuance costs (373,224 ) Net carrying amount $ 891,776 Carrying amount of the equity component $ 377,432 As of December 31, 2019, the debt discount and debt issuance costs on the Convertible Notes will be amortized over the remaining period of approximately 6.6 years. The following table details interest expense recognized related to the Convertible Notes for the year ended December 31, 2019: Amount (in thousands) Contractual interest expense $ 3,723 Amortization of debt issuance costs 433 Amortization of debt discount 17,364 Total $ 21,520 As of December 31, 2019, the if-converted value of the Convertible Notes did not exceed the principal amount. Capped Call Transactions In connection with the pricing of the Convertible Notes, we entered into separate Capped Call Transactions with certain counterparties at a net cost of $102.1 million. The cap price of the Capped Call Transactions is initially $32.58 per share of our Class A common stock, representing a premium of 100% above the last reported sale price of $16.29 per share of our Class A common stock on August 6, 2019, and is subject to certain adjustments under the terms of the Capped Call Transactions. Conditions that cause adjustments to the initial strike price of the Capped Call Transactions mirror conditions that result in corresponding adjustments for the Convertible Notes. The Capped Call Transactions are intended to reduce potential dilution to holders of our Class A common stock beyond the conversion price of $22.81, up to $32.58, on any conversion of the Convertible Notes or offset any cash payments we are required to make in excess of the principal amount of such converted Convertible Notes, as the case may be, with such reduction or offset subject to a cap. The cost of the Capped Call Transactions was recorded as a reduction of our additional paid-in capital in our consolidated balance sheets. Credit Facility In July 2016, we entered into a five-year that allows us to borrow up to $ 1.1 billion to fund working capital and general corporate-purpose expenditures. The loan bears interest at LIBO plus 0.75 %, as well as an annual commitment fee of 0.10 % on the daily undrawn balance of the facility. No origination fees were incurred at the closing of the Credit Facility. In December 2016, the amount we are permitted to borrow under the Credit Facility was increased to $ 1.2 billion. In February 2018, the amount we are permitted to borrow under the Credit Facility was increased to $ 1.25 billion. In August 2018, we amended the Credit Facility to extend the term to August 2023 with respect to an aggregate of $ 1.05 billion of the $ 1.25 billion that we may borrow under the Credit Facility. In August 2019, we amended the Credit Facility to revise the covenants that restrict the repurchase of equity securities and the incurrence of indebtedness to permit the Capped Call Transactions and issuance of the Convertible Notes. A s of December 31, 2019, no amounts were outstanding under the Credit Facility . A s of December 31, 2019, we had $ 25.5 million in the form of outstanding standby letters of credit.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	8. Commitments and Contingencies Commitments We have non-cancelable contractual agreements related to the hosting of our data storage processing, storage, and other computing services. In January 2017, we entered into the Google Cloud Platform License Agreement. Under the agreement, we were granted a license to access and use certain cloud services. The agreement has an initial term of five years and we are required to purchase at least $400.0 million of cloud services in each year of the agreement. For each of the first four years, up to 15% of this amount may be moved to a subsequent year. If we fail to meet the minimum purchase commitment during any year, we are required to pay the difference. In March 2016, we entered into the AWS Enterprise Agreement for the use of cloud services from Amazon Web Services, Inc. (“AWS”). Under the agreement, as amended, we are committed to spend an aggregate of $1.1 billion between January 2017 and December 2022 on AWS services ($90.0 million in 2018, $150.0 million in 2019, $215.0 million in 2020, $280.0 million in 2021, and $349.0 million in 2022). If we fail to meet the minimum purchase commitment during any year, we are required to pay the difference. Any such payment may be applied to future use of AWS services during the term, although it will not count towards meeting the future minimum purchase commitments. The future minimum contractual commitment including commitments less than one year, as of December 31, 2019 for each of the next five years are as follows: Minimum Commitment (in thousands) Year ending December 31, 2020 $ 640,957 2021 684,374 2022 384,596 2023 883 2024 883 Thereafter 214 Total minimum commitments $ 1,711,907 Contingencies We record a loss contingency when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. We also disclose material contingencies when we believe a loss is not probable but reasonably possible. Accounting for contingencies requires us to use judgment related to both the likelihood of a loss and the estimate of the amount or range of loss. Many legal and tax contingencies can take years to be resolved. Pending Matters Beginning in May 2017, we, certain of our officers and directors, and the underwriters for our IPO were named as defendants in securities class actions purportedly brought on behalf of purchasers of our Class A common stock, alleging violation of securities laws, that arose following our IPO. On January 17, 2020, we reached a preliminary agreement to settle the securities class actions. The preliminary settlement agreement was signed in January 2020 and provided for a resolution of all of the pending claims in the securities class actions for $187.5 million. In the fourth quarter of 2019, we recorded legal expense, net of amounts directly covered by insurance, of $100.0 million for the expected settlement of the stockholder actions since we concluded the loss was probable and estimable. The amount was recorded in general and administrative expense in our consolidated statements of operations. See Note 17 for additional discussion. On April 3, 2018, BlackBerry Limited filed a lawsuit against us alleging that we infringe six of its patents. This lawsuit was recently dismissed after four of the patents were ruled to be invalid; however, Blackberry Limited has since appealed the ruling to the U.S. Court of Appeals for the Federal Circuit. Management believes we have meritorious defenses to these claims. In 2017, Vaporstream, Inc. filed a lawsuit against us alleging that we infringe a number of its patents. We filed a motion to dismiss, which the court denied without prejudice to re-file after further factual development. Later in 2017, we filed a motion for summary judgment. On February 27, 2018, the court issued an order denying our motion for summary judgment. On June 13, 2018, the court stayed the lawsuit pending the outcome of several challenges to the validity of the patents, filed by us at the U.S. Patent and Trademark Office (“USPTO”). On September 13, 2019, the court removed the stay with respect to several of Vaporstream's patents that the USPTO determined were not shown to be unpatentable. A trial date has been scheduled for early 2020. While management believes we have meritorious defenses to Vaporstream’s claims, the outcome of this matter remains uncertain. The outcomes of our legal proceedings are inherently unpredictable, subject to significant uncertainties, and could be material to our financial condition, results of operations, and cash flows for a particular period. For the pending matters described above, it is not possible to estimate the reasonably possible loss or range of loss. We are subject to various other legal proceedings and claims in the ordinary course of business, including certain patent, trademark, privacy, regulatory, and employment matters. Although occasional adverse decisions or settlements may occur, we do not believe that the final disposition of any of our other pending matters will seriously harm our business, financial condition, results of operations, and cash flows. Indemnifications In the ordinary course of business, we may provide indemnifications of varying scope and terms to customers, vendors, lessors, investors, directors, officers, employees, and other parties with respect to certain matters. Indemnification may include losses from our breach of such agreements, services we provide, or third party intellectual property infringement claims. These indemnifications may survive termination of the underlying agreement and the maximum potential amount of future indemnification payments may not be subject to a cap. We have not incurred material costs to defend lawsuits or settle claims related to these indemnifications as of December 31, 2019. We believe the fair value of these liabilities is immaterial and accordingly have no liabilities recorded for these agreements at December 31, 2019.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	9. Leases We have various non-cancelable lease agreements for certain of our offices with original lease periods expiring between 2020 and 2032. Our lease terms may include options to extend or terminate the lease when it is reasonably certain we will exercise that option. Certain of the arrangements have free rent periods or escalating rent payment provisions. Leases with an initial term of twelve months or less are not recorded on the consolidated balance sheets. We recognize rent expense on a straight-line basis over the lease term. Additionally, we sublease certain operating leases to third parties primarily as a result of moving to a centralized corporate office in Santa Monica, California in 2018. Lease Cost The components of lease cost were as follows: Year Ended December 31, 2019 (in thousands) Operating lease expense $ 60,921 Sublease income (4,716 ) Total net lease costs $ 56,205 Lease Term and Discount Rate The weighted-average remaining lease term (in years) and discount rate related to the operating leases were as follows: December 31, 2019 Weighted-average remaining lease term 8.1 Weighted-average discount rate 5.7 % As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the lease commencement date to determine the present value of lease payments. Maturity of Lease Liabilities The present value of our operating lease liabilities as of December 31, 2019 were as follows: Operating Leases (in thousands) Year ending December 31, 2020 $ 60,774 2021 64,822 2022 56,655 2023 52,754 2024 52,458 Thereafter 144,184 Total lease payments $ 431,647 Less: Imputed interest (86,194 ) Present value of lease liabilities $ 345,453 As of December 31, 2019, we have additional operating leases for facilities that have not yet commenced with lease obligations of $13.8 million. These operating leases will commence between 2020 and 2024 with lease terms of greater than one year to five years. This table does not include lease payments that were not fixed at commencement or modification. In 2018, we exited various operating leases prior to the end of the contractual lease term, primarily as a result of moving to a centralized corporate office located in Santa Monica, California. The charges, recorded as general and administrative expenses, primarily included the present value of our remaining lease obligation on the cease use dates that occurred during the period, net of estimated sublease income. As of December 31, 2018, we had exited all properties associated with this event. On January 1, 2019, under the transition provisions of ASU 2016-02 (Topic 842), we adjusted the initial measurement of the lease asset related to the lease exit properties by $32.1 million which represents the carrying amount of the associated lease exit liability as of December 31, 2018. Changes to our estimated sublease income, including actual contracted sublease income, may result in impairment of the right-of-use asset in the period determined. Prior to January 1, 2019, we had several lease agreements where we were deemed the owner under build-to-suit lease accounting. The value of the leased property and corresponding financing obligations was included in property and equipment, net and other liabilities, respectively, on our consolidated balance sheets as of December 31, 2018. Net assets capitalized under build-to-suit leases were $48.4 million as of December 31, 2018. As part of the adoption of Topic 842, we derecognized those assets and liabilities and recorded the difference as an adjustment to accumulated deficit at January 1, 2019. These leases are included within the right-of-use asset and lease liability balances on our consolidated balance sheet as of December 31, 2019. Other Information Cash payments included in the measurement of our o perating lease liabilities were $66.3 million for the year ended December 31, 2019. Lease liabilities arising from obtaining operating lease right-of-use assets were $35.2 million for the year ended December 31, 2019

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	10. Fair Value Measurements Assets and liabilities measured at fair value are classified into the following categories: • Level 1: Quoted market prices in active markets for identical assets or liabilities. • Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. • Level 3: Unobservable inputs reflecting the reporting entity’s own assumptions or external inputs from inactive markets. We classify our cash equivalents and marketable securities within Level 1 or Level 2 because we use quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value. There were no transfers between levels during the periods presented. The following table sets forth our financial assets as of December 31, 2019 and 2018 that are measured at fair value on a recurring basis during the period: December 31, 2019 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Total Estimated Fair Value (in thousands) Cash $ 416,099 $ — $ — $ 416,099 Level 1 securities: U.S. government securities 1,305,145 604 (49 ) 1,305,700 U.S. government agency securities 269,278 48 (32 ) 269,294 Level 2 securities: Corporate debt securities 28,420 13 (4 ) 28,429 Commercial paper 84,498 — — 84,498 Certificates of deposit 8,785 — — 8,785 Total $ 2,112,225 $ 665 $ (85 ) $ 2,112,805 December 31, 2018 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Total Estimated Fair Value (in thousands) Cash $ 279,950 $ — $ — $ 279,950 Level 1 securities: U.S. government securities 735,988 12 (175 ) 735,825 U.S. government agency securities 181,032 4 (36 ) 181,000 Level 2 securities: Corporate debt securities 35,819 1 (18 ) 35,802 Commercial paper 33,193 — — 33,193 Certificates of deposit 13,293 — — 13,293 Total $ 1,279,275 $ 17 $ (229 ) $ 1,279,063 Gross unrealized losses in a continuous loss position for 12 months or longer are not material as of December 31, 2019 and 2018. As of December 31, 2019, we considered any decreases in market value on our marketable securities to be temporary in nature and did not consider any of our investments to be other-than-temporarily impaired. All of our marketable securities have contractual maturities of less than one year. We carry the Convertible Notes at face value less the unamortized discount and issuance costs on our consolidated balance sheets and present that fair value for disclosure purposes only. As of December 31, 2019, the fair value of the Convertible Notes was $1.3 billion. The estimated fair value of the Convertible Notes, which are classified as Level 2 financial instruments, was determined based on the estimated or actual bid prices of the Convertible Notes in an over-the-counter market on the last business day of the period.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes The domestic and foreign components of pre-tax loss were as follows: Year Ended December 31, 2019 2018 2017 (in thousands) Domestic $ (770,448 ) $ (969,922 ) $ (3,027,580 ) Foreign (262,819 ) (283,442 ) (435,828 ) Loss before income taxes $ (1,033,267 ) $ (1,253,364 ) $ (3,463,408 ) The components of our income tax (benefit) expense were as follows: Year Ended December 31, 2019 2018 2017 (in thousands) Current: Federal $ — $ — $ — State 113 106 (1,784 ) Foreign 771 2,824 932 Total current income tax (benefit) expense 884 2,930 (852 ) Deferred: Federal (277 ) (15 ) (12,287 ) State (85 ) (40 ) 303 Foreign (129 ) (328 ) (5,506 ) Total deferred income tax (benefit) expense (491 ) (383 ) (17,490 ) Income tax (benefit) expense $ 393 $ 2,547 $ (18,342 ) The following is a reconciliation of the statutory federal income tax rate to our effective tax rate: Year Ended December 31, 2019 2018 2017 Tax benefit (expense) computed at the federal statutory rate 21.0 % 21.0 % 34.0 % State tax benefit (expense), net of federal benefit 7.6 5.1 3.0 Change in valuation allowance (38.5 ) (28.4 ) (25.4 ) U.S. corporate tax rate reduction — 0.2 (11.4 ) Differences between U.S. and foreign tax rates on foreign income (1.0 ) (0.9 ) (2.4 ) Stock-based compensation benefit (expense) 0.8 (1.2 ) 1.1 U.S. federal research & development credit benefit 6.3 5.2 1.4 Acquisitions and divestitures 3.4 0.2 — Other benefits (expenses) 0.4 (1.4 ) 0.2 Total income tax benefit (expense) 0.0 % (0.2 )% 0.5 % The significant components of net deferred tax balances were as follows: Year Ended December 31, 2019 2018 (in thousands) Deferred tax assets: Accrued expenses $ 31,746 $ 21,056 Intangible assets 172,228 140,494 Stock-based compensation 134,489 254,255 Loss carryforwards 1,201,569 849,224 Tax credit carryforwards 337,497 235,300 Property and equipment — 203 Lease liability 84,154 — Other 2,485 1,298 Total deferred tax assets $ 1,964,168 $ 1,501,830 Deferred tax liabilities: Property and equipment $ (1,420 ) $ — Convertible debt (87,904 ) — Right-of-use asset (63,595 ) — Total deferred tax liabilities $ (152,919 ) $ — Total net deferred tax assets before valuation allowance 1,811,249 1,501,830 Valuation allowance (1,811,666 ) (1,502,346 ) Net deferred taxes $ (417 ) $ (516 ) Income tax expense was $0.4 million for the year ended December 31, 2019, compared to a tax expense of $2.5 million for the year ended December 31, 2018. The Tax Act made significant changes to the Code, including a corporate income tax rate decrease to 21% effective for tax years beginning after December 31, 2017. The Tax Act also introduced the global intangible low-taxed income (“GILTI”) provisions, which generally impose a tax on the net income of foreign corporate subsidiaries in excess of a deemed return on their tangible assets. We recognize the tax on GILTI as an expense in the period the tax is incurred. We have not provided deferred taxes related to temporary differences that on their reversal will affect the amount of income subject to GILTI in the period the tax is incurred. Upon the adoption of ASU 2016-12 on January 1, 2019, we recognized a $90.9 million deferred tax asset and a $69.0 million deferred tax liability for operating lease liabilities and operating lease right-of-use assets, respectively, with offsetting $14.4 million and $7.5 million reductions to the deferred tax assets for accrued expenses and property and equipment, respectively. Taken together on a net basis, there is no change to our total net deferred tax assets before valuation allowance as a result of these changes. The issuance of the Convertible Notes in August 2019 resulted in a temporary difference between the carrying amount and tax basis of the Convertible Notes due to the allocation of debt proceeds and debt issuance costs between the liability and equity components. This basis difference resulted in the recognition of a $92.1 million net deferred tax liability and an offsetting change to our valuation allowance, both of which were recorded to additional paid-in-capital on our consolidated balance sheets. As of December 31, 2019, we had an immaterial amount of unremitted earnings related to certain foreign subsidiaries. We intend to continue to reinvest our foreign earnings indefinitely and do not expect to incur any significant taxes related to such amounts. As of December 31, 2019, we had accumulated U.S. federal and state net operating loss carryforwards of $4.0 billion and $2.3 billion, respectively. Of the $4.0 billion of federal net operating loss carryforwards, $1.5 billion was generated before January 1, 2018 and is subject to a 20-year carryforward period. The remaining $2.5 billion can be carried forward indefinitely but is subject to an 80% taxable income limitation. The pre-Tax Act losses and state net operating loss carryforwards will begin to expire in 2031 and 2026, respectively. As of December 31, 2019, we had $1.3 billion of U.K. net operating loss carryforwards that can be carried forward indefinitely. As of December 31, 2019, we had accumulated U.S. federal and state research tax credits of $225.2 million and $135.8 million, respectively. The U.S. federal research tax credits will begin to expire in 2032. The U.S. state research tax credits do not expire. We recognize valuation allowances on deferred tax assets if it is more likely than not that some or all of the deferred tax assets will not be realized. We had valuation allowances against net deferred tax assets of $1.8 billion and $1.5 billion as of December 31, 2019 and 2018, respectively. In 2019, the increase in valuation allowance attributable to the net increase in our deferred tax assets resulting from the loss from operations was partially offset by the release of valuation allowance in additional paid-in-capital related to the Convertible Note issuance. Uncertain Tax Positions The following table summarizes the activity related to our gross unrecognized tax benefits during the years ended December 31, 2019 and 2018: Year Ended December 31, 2019 2018 (in thousands) Beginning balance of unrecognized tax benefits $ 251,808 $ 203,177 Additions for current year tax positions 40,221 43,197 Additions for prior year tax positions 1,977 7,615 Reductions for prior year tax positions (7,425 ) (1,965 ) Changes due to foreign currency translation adjustments 24 (216 ) Ending balance of unrecognized tax benefits (excluding interest and penalties) $ 286,605 $ 251,808 Interest and penalties associated with unrecognized tax benefits 200 260 Ending balance of unrecognized tax benefits (including interest and penalties) $ 286,805 $ 252,068 The total amount of gross unrecognized tax benefits, including related interest and penalties, was $286.8 million and $252.1 million as of December 31, 2019 and 2018, respectively. Substantially all of the unrecognized tax benefit was recorded as a reduction in our gross deferred tax assets, offset by a corresponding reduction in our valuation allowance. We have net unrecognized tax benefits of $1.5 million and $2.7 million that is included in other liabilities on our consolidated balance sheet as of December 31, 2019 and 2018, respectively. Assuming there continues to be a valuation allowance against deferred tax assets in future periods when gross unrecognized tax benefits are realized, this would result in a tax benefit of $ 2.7 Our policy is to recognize interest and penalties associated with tax matters as part of the income tax provision and include accrued interest and penalties with the related income tax liability on our consolidated balance sheet. During the year ended December 31, 2019, interest expense recorded related to uncertain tax positions was not material. In June 2019, the United States Court of Appeals for the Ninth Circuit overturned the 2015 Tax Court decision in Altera Corp. v. Commissioner, upholding the portion of the Treasury regulations issued under Section 482 of the Code requiring related-party participants in a cost sharing arrangement to share stock-based compensation costs. In July 2019, the taxpayer filed a petition for an en banc rehearing before the Ninth Circuit, which was denied in November 2019. The taxpayer has 90 days from that date to petition the U.S. Supreme Court for review of the decision. Depending on the final resolution of this matter, there is a reasonable possibility that there will be a significant impact on our gross unrecognized tax benefits. As a result of the valuation allowance held against our deferred tax assets, we do not believe the final resolution will result in a material impact on our income tax expense, net deferred taxes, net unrecognized tax benefits, or consolidated financials. The income taxes we pay are subject to review by taxing jurisdictions globally. Our estimate of the potential outcome of any uncertain tax position is subject to management’s assessment of relevant risks, facts, and circumstances existing at that time. We believe that our estimate has adequately provided for these matters. However, our future results may include adjustments to estimates in the period the audits are resolved, which may impact our effective tax rate. Tax years ending on or after December 31, 2012 are subject to examination in the U.S., and tax years ending on or after December 31, 2017 are subject to examination in the U.K.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Abstract]
Accumulated Other Comprehensive Income (Loss)	12. Accumulated Other Comprehensive Income (Loss) The table below presents the changes in accumulated other comprehensive income (loss) (“AOCI”) by component and the reclassifications out of AOCI: Changes in Accumulated Other Comprehensive Income (Loss) by Component Marketable Securities Foreign Currency Translation Total (in thousands) Balance at December 31, 2018 $ (368 ) $ 3,515 $ 3,147 OCI before reclassifications 873 (3,371 ) (2,498 ) Amounts reclassified from AOCI (1) (76 ) — (76 ) Net current period OCI 797 (3,371 ) (2,574 ) Balance at December 31, 2019 $ 429 $ 144 $ 573 (1 ) Realized gains and losses on marketable securities are reclassified from AOCI into other income (expense), net in the consolidated statements of operations.

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Property and Equipment, Net	13. Property and Equipment, Net Property and equipment, net, consisted of the following: As of December 31, 2019 2018 (in thousands) Computer hardware and software $ 27,528 $ 27,920 Buildings — 54,050 Leasehold improvements 165,150 107,265 Furniture and equipment 85,366 75,570 Construction in progress 8,183 14,751 Total 286,227 279,556 Less: accumulated depreciation and amortization (112,560 ) (66,996 ) Property and equipment, net $ 173,667 $ 212,560 Depreciation and amortization expense on property and equipment was $53.8 million, $49.0 million, and $29.8 million for the years ended December 31, 2019, 2018, and 2017, respectively. The following table lists property and equipment, net by geographic area: As of December 31, 2019 2018 (in thousands) Property and equipment, net: United States $ 153,771 $ 190,412 Rest of world (1) 19,896 22,148 Total property and equipment, net $ 173,667 $ 212,560 (1) No individual country exceeded 10% of our total property and equipment, net for any period presented.

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Balance Sheet Components	14. Balance Sheet Components Accrued expenses and other current liabilities at December 31, 2019 and 2018 consisted of the following: As of December 31, 2019 2018 (in thousands) Accrued infrastructure costs $ 116,184 $ 94,819 Securities class actions legal charges 100,000 — Accrued compensation and related expenses 43,985 41,610 Partner revenue share liability 30,606 37,642 Deferred revenue 20,082 10,957 Other 99,753 76,787 Total accrued expenses and other current liabilities $ 410,610 $ 261,815 Other liabilities at December 31, 2019 and 2018 consisted of the following: As of December 31, 2019 2018 (in thousands) Sublease liability $ — $ 32,057 Deferred rent — 28,370 Lease incentive liability — 25,880 Other 57,382 24,109 Total other liabilities $ 57,382 $ 110,416

Non-Marketable Investments

Non-Marketable Investments	12 Months Ended
	Dec. 31, 2019
Equity Method Investments And Joint Ventures [Abstract]
Non-Marketable Investments	15. Non-Marketable Investments We held investments in privately held companies with a carrying value of $55.0 million and $43.6 million as of December 31, 2019 and 2018, respectively. Our share of gains and losses in equity method investments was not material for the years ended December 31, 2019, 2018, and 2017, and is included in other income (expense), net in our consolidated statements of operations. Non-marketable investments are included within other assets on the consolidated balance sheet. Such investments are reviewed periodically for impairments. Impairment recorded for the year ended December 31, 2019 was not material. We recorded impairments of $7.2 million for the year ended December 31, 2018 million within other income (expense), net in the consolidated statements of operations. No impairments were recorded in the year ended December 31, 2017. Additionally, we recognized gains on non-marketable investments of $20.8 million within other income (expense), net on the consolidated statement of operations.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	16. Employee Benefit Plans We have a defined contribution 401(k) plan (the “401(k) Plan”) for our U.S.-based employees. The 401(k) Plan is available for all full-time employees who meet certain eligibility requirements. Eligible employees may contribute up to 100% of their annual compensation, but are limited to the maximum annual dollar amount allowable under the Code. We match 100% of each participant’s contribution up to a maximum of 3% of the participant’s base salary, bonus, and commissions paid during the period, and we match 50% of each participant’s contribution between 3% and 5% of the participant’s base salary, bonus, and commissions paid during the period. During the years ended December 31, 2019, 2018, and 2017, we recognized expense of $15.4 million, $16.1 million, and $12.4 million, respectively, related to matching contributions.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events On January 17, 2020, we reached a preliminary agreement to settle the securities class actions that arose following our IPO. The preliminary settlement agreement was signed in January 2020 and provided for a resolution of all of the pending claims in the securities class actions for $187.5 million. The agreement is subject to approval by the federal and state courts before which the securities class actions are pending. The terms of the settlement include a full release of all claims against all defendants including Snap, its officers and directors, and the underwriters for our IPO. We evaluated this subsequent event, concluding it provided additional evidence about a condition that existed as of December 31, 2019. In the fourth quarter of 2019, we recorded legal expense, net of amounts directly covered by insurance, of $100.0 million for the expected settlement of the securities class action s . The amount was recorded in general and administrative expense in our consolidated statements of operations.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). Our consolidated financial statements include the accounts of Snap Inc. and our wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Our fiscal year ends on December 31.
Initial Public Offering	Initial Public Offering In March 2017, we completed our initial public offering (“IPO”) in which we issued and sold 160.3 million shares of Class A common stock, inclusive of the over-allotment, at an initial public offering price of $17.00 per share and excluding shares sold in the IPO by certain of our existing stockholders. We received net proceeds of $2.6 billion after deducting underwriting discounts and commissions of $68.1 million and other offering expenses of $14.7 million. On the closing of the IPO, all shares of our then-outstanding convertible preferred stock other than Series FP preferred stock automatically converted into an aggregate of 246.8 million shares of Class B common stock and all outstanding shares of Series FP preferred stock automatically converted into 215.9 million shares of Class C common stock. Following the IPO, we have three classes of authorized common stock – Class A common stock, Class B common stock, and Class C common stock. Restricted stock units (“RSUs”) granted to employees before January 1, 2017 (“Pre-2017 RSUs”) included both service-based and performance conditions to vest in the underlying common stock. The performance condition related to these awards was satisfied on the effectiveness of the registration statement for our IPO, which occurred in March 2017. On the effectiveness of the registration statement for our IPO, we recognized $1.3 billion of stock-based compensation expense for Pre-2017 RSUs. To meet the related tax withholding requirements, we withheld 12.1 million of the 26.7 million shares of common stock issued. Based on the initial public offering price of $17.00 per share, the tax withholding obligation for these vested Pre-2017 RSUs was $206.6 million. In addition, on the closing of the IPO, our Chief Executive Officer (“CEO”) received an RSU award (“CEO award”) for 37.4 million shares of Series FP preferred stock, which automatically converted into an equivalent number of shares of Class C common stock on the closing of the IPO. The CEO award represented 3.0% of all outstanding shares on the closing of the IPO, including shares sold by us in the IPO and vested stock options and RSUs, net of shares withheld to satisfy tax withholding obligations, on the closing of the IPO. The CEO award vested immediately on the closing of the IPO, and such shares are being delivered to the CEO in quarterly installments over three years which began in November 2017. There is no continuing service requirement for our CEO. The stock-based compensation expense recognized related to the CEO award was $636.6 million, which is based on the vesting of 37.4 million shares of Class C common stock on the closing of the IPO, at the initial public offering price of $17.00 per share. As of December 31, 2019 and 2018, in accordance with terms of the CEO award, 28.0 million and 15.6 million shares of Class C common stock were issued, respectively. At December 31, 2019 and 2018, 9.4 million and 21.8 million shares of Class C common stock were to be issued in future periods in equal quarterly installments through 2020, respectively. The future tax benefits on settlement of the above RSUs is not expected to be material as currently we have established valuation allowances to reduce our net deferred tax assets to the amount that is more likely than not to be realized. The majority of the future tax benefits that arise on settlement of the above RSUs are in jurisdictions for which our net deferred tax assets have a full valuation allowance.
Use of Estimates	Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the consolidated financial statements. Management’s estimates are based on historical information available as of the date of the consolidated financial statements and various other assumptions that we believe are reasonable under the circumstances. Actual results could differ from those estimates. Key estimates relate primarily to determining the fair value of assets and liabilities assumed in business combinations, evaluation of contingencies, uncertain tax positions, excess inventory reserves, lease exit charges, forfeiture rate, the fair value of convertible senior notes, and the fair value of stock-based awards. On an ongoing basis, management evaluates our estimates compared to historical experience and trends, which form the basis for making judgments about the carrying value of assets and liabilities.
Concentrations of Business Risk	Concentrations of Business Risk We currently use both Google Cloud and Amazon Web Services for our hosting requirements. A disruption or loss of service from one or both of these partners could seriously harm our ability to operate. Although we believe there are other qualified providers that can provide these services, a transition to a new provider could create a significant disruption to our business and negatively impact our consolidated financial statements.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash, cash equivalents, marketable securities, and accounts receivable. We maintain cash deposits, cash equivalent balances, and marketable securities with several financial institutions. Cash and cash equivalents may be withdrawn or redeemed on demand. We believe that the financial institutions that hold our cash and cash equivalents are financially sound and, accordingly, minimal credit risk exists with respect to these balances. We also maintain investments in U.S. government debt and agency securities, corporate debt securities, certificates of deposit, and commercial paper that carry high credit ratings and accordingly, minimal credit risk exists with respect to these balances. We extend credit to our customers based on an evaluation of their ability to pay amounts due under contractual arrangement and generally do not obtain or require collateral.
Revenue Recognition	Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to receive in exchange for those goods or services. See Note 2 for additional information.
Cost of Revenue	Cost of Revenue Cost of revenue includes payments for content and third party selling costs, referred to as revenue share. Under some of these arrangements, we pay a portion of the fees we receive from the advertisers for Snap Ads that are displayed within partner content on Snapchat. Revenue-share costs were $174.7 million, $120.3 million, and $96.3 million for the years ended December 31, 2019, 2018, and 2017, respectively. In addition, cost of revenue consists of expenses associated with infrastructure costs of the Snapchat mobile application, advertising measurement services, and personnel-related costs. Cost of revenue includes facilities and other supporting overhead costs, including depreciation and amortization, and inventory costs for Spectacles.
Advertising	Advertising Advertising costs are expensed as incurred and were $31.4 million, $11.3 million, and $10.9 million for the years ended December 31, 2019, 2018, and 2017, respectively.
Stock-based Compensation	Stock-based Compensation We measure and recognize compensation expense for stock-based payment awards, including stock options, RSUs, and restricted stock awards (“RSAs”) granted to employees, directors, and advisors, based on the grant date fair value of the awards. The grant date fair value of stock options is estimated using a Black-Scholes option pricing model. The fair value of stock-based compensation for stock options is recognized on a straight-line basis, net of estimated forfeitures, over the period during which services are provided in exchange for the award. The grant date fair value of RSUs and RSAs is estimated based on the fair value of our underlying common stock. Pre-2017 RSUs contained both service-based and performance conditions to vest in the underlying common stock. The service-based condition criteria is generally met 10% after the first year of service, 20% over the second year, 30% over the third year, and 40% over the fourth year. The performance condition related to these awards was satisfied on the effectiveness of the registration statement for our IPO, which occurred in March 2017. Awards which contain both service-based and performance conditions were recognized using the accelerated attribution method once the performance condition was probable of occurring. All RSUs granted after December 31, 2016 vest on the satisfaction of only a service-based condition (“Post-2017 RSUs”). The service condition for RSUs granted prior to February 2018 is generally satisfied over four years, 10% after the first year of service, 20% over the second year, 30% over the third year, and 40% over the fourth year. In limited instances, we have issued Post-2017 RSUs with vesting periods in excess of four years. The service condition for RSUs and RSAs granted after February 2018 is generally satisfied in equal monthly or quarterly installments over four years. For these awards, we recognize stock-based compensation expense on a straight-line basis over the vesting period. Stock-based compensation expense recognized for all periods presented is based on awards that are expected to vest, including an estimate of forfeitures. We estimate the forfeiture rate using historical forfeitures of equity awards and other expected changes in facts and circumstances, if any. A modification of the terms of a stock-based award is treated as an exchange of the original award for a new award with total compensation cost equal to the grant-date fair value of the original award plus the incremental value of the modification to the award.
Income Taxes	Income Taxes We are subject to income taxes in the United States and numerous foreign jurisdictions. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the deferred tax asset or liability is expected to be realized or settled. In evaluating our ability to recover deferred tax assets, we consider all available positive and negative evidence, including historical operating results, ongoing tax planning, and forecasts of future taxable income on a jurisdiction-by-jurisdiction basis. Based on the level of historical losses, we have established a valuation allowance to reduce our net deferred tax assets to the amount that is more likely than not to be realized. We recognize a tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in our consolidated financial statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized. We recognize interest and penalties associated with tax matters as part of the income tax provision and include accrued interest and penalties with the related income tax liability on our consolidated balance sheets.
Currency Translation and Remeasurement	Currency Translation and Remeasurement The functional currency of the majority of our foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities denominated in a foreign currency are remeasured into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are remeasured at the average exchange rates during the period. Equity transactions and other non-monetary assets are remeasured using historical exchange rates. Foreign currency transaction gains and losses are recorded in other income (expense), net on our consolidated statement of operations. For those foreign subsidiaries where the local currency is the functional currency, adjustments to translate those statements into U.S. dollars are recorded in accumulated other comprehensive income (loss) in stockholders’ equity.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of highly liquid investments with original maturities of 90 days or less from the date of purchase.
Restricted Cash	Restricted Cash We are required to maintain restricted cash deposits to back letters of credit for certain property leases. These funds are restricted and have been classified in other assets on our consolidated balance sheets due to the nature of restriction. At December 31, 2019 and 2018, restricted cash balances were immaterial.
Marketable Securities	Marketable Securities We hold investments in marketable securities consisting of U.S. government securities, U.S. government agency securities, corporate debt securities, certificates of deposit, and commercial paper. We classify our marketable securities as available-for-sale investments in our current assets because they represent investments available for current operations. Our available-for-sale investments are carried at fair value with any unrealized gains and losses, included in accumulated other comprehensive (loss) income in stockholders’ equity. We determine gains or losses on the sale or maturities of marketable securities using the specific identification method and these gains or losses are recorded in other income (expense), net in our consolidated statements of operations. Unrealized losses are recorded in other income (expense), net when a decline in fair value is determined to be other than temporary.
Inventory	Inventory Prepaid expenses and other current assets include our Spectacles inventory, which consists of finished goods purchased from contract manufacturers. Inventory is stated at the lower of cost or market on a weighted-average cost basis. Inventories are written down for estimated obsolescence or excess inventory equal to the difference between the cost of inventory and estimated market value. Adjustments to reduce inventory to net realizable value are recognized in cost of revenue.
Non-Marketable Investments	Non-Marketable Investments Our investments in privately-held companies are primarily non-marketable equity securities without readily determinable fair values. We adjust the carrying value of non-marketable equity securities to fair value upon observable transactions for identical or similar investments of the same issuer or upon impairment. Any adjustments to carrying value of these investments are recorded in other income (expense) net in our consolidated statements of operations. When we exercise significant influence over, but do not control the investee, such non-marketable investments are accounted for using the equity method. Under the equity method of accounting, we record our share of the results of the investments within other income (expense), net in our consolidated statements of operations.
Fair Value Measurements	Fair Value Measurements Certain financial instruments are required to be recorded at fair value. Other financial instruments, including cash and cash equivalents and restricted cash, are recorded at cost, which approximates fair value. Additionally, accounts receivable, accounts payable, and accrued expenses approximate fair value because of the short-term nature of these financial instruments.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at the invoiced amount less any allowance for doubtful accounts to reserve for potentially uncollectible receivables. To determine the amount of the allowance, we make judgments about the creditworthiness of customers based on ongoing credit evaluation and historical experience. At December 31, 2019 and 2018, the allowance for doubtful accounts was immaterial.
Property and Equipment	Property and Equipment Property and equipment are stated at cost, less accumulated depreciation. We compute depreciation using the straight-line method over the estimated useful lives of the assets, which is generally three years for computer hardware and software, five years for furniture and equipment, and over the shorter of lease term or useful life of the assets for leasehold improvements. Buildings are depreciated over a useful life ranging from 25 to 45 years. Maintenance and repairs are expensed as incurred.
Leases	Leases We have various non-cancelable lease agreements for certain of our offices. Leases are recorded as operating lease right-of-use assets and operating lease liabilities on the consolidated balance sheets. Leases with an initial term of twelve months or less are not recorded on the consolidated balance sheets. We recognize rent expense on a straight-line basis over the lease term.
Software Development Costs	Software Development Costs Software development costs include costs to develop software to be used to meet internal needs and applications used to deliver our services. We capitalize development costs related to these software applications once the preliminary project stage is complete and it is probable that the project will be completed and the software will be used to perform the function intended. Costs capitalized for developing such software applications were not material for the periods presented.
Segments	Segments Our CEO is our chief operating decision maker. We have determined that we have a single operating segment. Our CEO evaluates performance and makes operating decisions about allocating resources based on financial data presented on a consolidated basis accompanied by disaggregated information about revenue by geographic region.
Business Combinations	Business Combinations We include the results of operations of the businesses that we acquire from the date of acquisition. We determine the fair value of the assets acquired and liabilities assumed based on their estimated fair values as of the respective date of acquisition. The excess purchase price over the fair values of identifiable assets and liabilities is recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires management to use significant judgment and estimates including the selection of valuation methodologies, estimates of future revenue and cash flows, discount rates, and selection of comparable companies. Our estimates of fair value are based on 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, not to exceed one year from the date of acquisition, we may record adjustments to the assets acquired and liabilities assumed, with a corresponding offset to goodwill. At the conclusion of the measurement period, any subsequent adjustments are reflected in the consolidated statements of operations. When we issue payments or grants of equity to selling stockholders in connection with an acquisition, we evaluate whether the payments or awards are compensatory. This evaluation includes whether cash payments or stock award vesting is contingent on the continued employment of the selling stockholder beyond the acquisition date. If continued employment is required for the cash to be paid or stock awards to vest, the award is treated as compensation for post-acquisition services and is recognized as compensation expense. Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expenses in our consolidated statements of operations.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of net assets acquired in a business combination. We test goodwill for impairment at least annually, in the fourth quarter, or whenever events or changes in circumstances indicate that goodwill might be impaired. For all periods presented, we had a single In testing for goodwill impairment, we first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, we determine it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if we conclude otherwise, we perform the first of a two-step impairment test. The first step compares the estimated fair value of a reporting unit to its book value, including goodwill. If the estimated fair value exceeds book value, goodwill is considered not to be impaired and no additional steps are necessary. However, if the fair value of the reporting unit is less than book value, then under the second step the carrying amount of the goodwill is compared to its implied fair value. There were no impairment charges in any of the periods presented.
Intangible Assets	Intangible Assets Intangible assets are carried at cost and amortized on a straight-line basis over their estimated useful lives. We determine the appropriate useful life of our intangible assets by measuring the expected cash flows of acquired assets. The estimated useful lives of intangible assets are as follows: Intangible Asset Estimated Useful Life Domain names 5 Years Trademarks 1 to 5 Years Acquired developed technology 4 to 7 Years Customer relationships 2 to 5 Years Patents 3 to 11 Years
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets We evaluate recoverability of our property and equipment and intangible assets, excluding goodwill, when events or changes indicate the carrying amount of an asset may not be recoverable. Events and changes in circumstances considered in determining whether the carrying value of long-lived assets may not be recoverable include: significant changes in performance relative to expected operating results; significant changes in asset use; and significant negative industry or economic trends and changes in our business strategy. Recoverability of these assets is measured by comparison of their carrying amount to future undiscounted cash flows to be generated. If impairment is indicated based on a comparison of the assets’ carrying values and the undiscounted cash flows, the impairment loss is measured as the amount by which the carrying amount of the assets exceeds the fair value of the assets. We determined that there were no events or changes in circumstances that indicated our long-lived assets were impaired during any of the periods presented.
Legal Contingencies	Legal Contingencies For legal contingencies, we accrue a liability for an estimated loss if the potential loss from any claim or legal proceeding is considered probable, and the amount can be reasonably estimated. Legal fees and expenses are expensed as incurred.
Convertible Notes	Convertible Notes We account for the Convertible Notes as separate liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component, representing the conversion option, is calculated by deducting the fair value of the liability component from the total principal of the Convertible Notes. This amount represents a debt discount which is amortized to interest expense over the term of the Convertible Notes using the effective interest rate method, which maintains a constant rate of interest expense based on the increasing carrying value of the debt.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Simplifying the Accounting for Income Taxes, In August 2018, the FASB issued ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments Codification Improvements to Topic 326, Financial Instruments—Credit Losses In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Estimated Useful Lives of Intangible Assets	The estimated useful lives of intangible assets are as follows: Intangible Asset Estimated Useful Life Domain names 5 Years Trademarks 1 to 5 Years Acquired developed technology 4 to 7 Years Customer relationships 2 to 5 Years Patents 3 to 11 Years Intangible assets consisted of the following: December 31, 2019 Weighted- Average Remaining Useful Life - Years Gross Carrying Amount Accumulated Amortization Net (in thousands, except years) Domain names 2.6 $ 5,414 $ 5,200 $ 214 Trademarks — 3,072 3,072 — Acquired developed technology 3.6 175,414 95,921 79,493 Customer relationships — 2,172 2,172 — Patents 5.9 19,710 7,296 12,414 $ 205,782 $ 113,661 $ 92,121 December 31, 2018 Weighted- Average Remaining Useful Life - Years Gross Carrying Amount Accumulated Amortization Net (in thousands except years) Domain names 1.6 $ 5,414 $ 4,283 $ 1,131 Trademarks 1.4 5,772 4,076 1,696 Acquired developed technology 3.8 179,791 78,729 101,062 Customer relationships 2.1 15,572 8,012 7,560 Patents 6.9 19,710 5,105 14,605 $ 226,259 $ 100,205 $ 126,054

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Disaggregation of Revenue by Geography	The following table represents our revenue disaggregated by geography based on the billing address of the advertising customer: Year Ended December 31, 2019 2018 2017 (in thousands) Revenue: North America (1) (2) $ 1,068,108 $ 780,992 $ 675,402 Europe (3) 299,913 183,077 98,047 Rest of world 347,513 216,377 51,500 Total revenue $ 1,715,534 $ 1,180,446 $ 824,949 (1) North America includes Mexico, the Caribbean, and Central America. (2) United States revenue was $1.0 billion, $752.9 million, and $643.0 million for the years ended December 31, 2019, 2018, and 2017, respectively. (3) Europe includes Russia and Turkey.

Net Loss per Share (Tables)

Net Loss per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Numerators and Denominators of Basic and Diluted Net Loss per Share Computations for Common Stock	The numerators and denominators of the basic and diluted net loss per share computations for our common stock are calculated as follows for the years ended December 31, 2019, 2018, and 2017: Year Ended December 31, 2019 2018 2017 (in thousands, except per share data) Class A Common Class B Common Class C Common Class A Common Class B Common Class C Common Class A Common (3) Class B Common (1) Class C Common (2) Numerator: Net loss $ (817,156 ) $ (33,341 ) $ (183,164 ) $ (921,235 ) $ (94,897 ) $ (239,779 ) $ (2,169,120 ) $ (548,098 ) $ (727,848 ) Net loss attributable to common stockholders $ (817,156 ) $ (33,341 ) $ (183,164 ) $ (921,235 ) $ (94,897 ) $ (239,779 ) $ (2,169,120 ) $ (548,098 ) $ (727,848 ) Denominator: Basic shares: Weighted-average common shares - Basic 1,087,366 44,366 243,730 953,992 98,271 248,305 734,203 185,520 246,362 Diluted shares: Weighted-average common shares - Diluted 1,087,366 44,366 243,730 953,992 98,271 248,305 734,203 185,520 246,362 Net loss per share attributable to common stockholders: Basic $ (0.75 ) $ (0.75 ) $ (0.75 ) $ (0.97 ) $ (0.97 ) $ (0.97 ) $ (2.95 ) $ (2.95 ) $ (2.95 ) Diluted $ (0.75 ) $ (0.75 ) $ (0.75 ) $ (0.97 ) $ (0.97 ) $ (0.97 ) $ (2.95 ) $ (2.95 ) $ (2.95 ) (1) Included in the Class B common stock, for all periods presented, is Series D, E, and F preferred stock, which automatically converted to Class B common stock on the closing of the IPO. Series A, A-1, B, and C preferred stock are included in Class B common stock on the automatic conversion of such shares to 163.0 million shares of Class B common stock on the closing of our IPO. (2) Included in the Class C common stock, for all periods presented, is Series FP preferred stock which automatically converted to Class C common stock on the closing of the IPO. Additionally, 37.4 million shares of Class C common stock related to the CEO award are included in Class C common stock on the closing of our IPO. (3) Class A common stock includes the issuance of 160.3 million shares of Class A common stock issued by us in connection with our IPO.
Schedule of Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss per Share	The following potentially dilutive shares were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented: Year Ended December 31, 2019 2018 2017 (in thousands) Stock options 10,262 16,291 32,596 Unvested RSUs and RSAs 148,797 158,264 163,796 Convertible Notes (if-converted) 55,468 — —

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Summary of Stock Option Award Activity	The following table summarizes the stock option award activity under the Stock Plans during the year ended December 31, 2019: Class A Number of Shares Class B Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (1) (in thousands, except per share data) Outstanding at December 31, 2018 13,322 2,969 $ 7.83 6.41 $ 34,567 Granted 118 — $ 14.69 — $ — Exercised (3,291 ) (1,389 ) $ 3.53 — $ — Forfeited (1,437 ) (30 ) $ 13.87 — $ — Outstanding at December 31, 2019 8,712 1,550 $ 9.00 5.59 $ 75,460 Exercisable at December 31, 2019 6,053 1,550 $ 8.00 4.65 $ 63,445 Vested and expected to vest at December 31, 2019 8,508 1,550 $ 8.91 5.54 $ 74,825 (1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing market price of our Class A common stock as of December 31, 2018 and December 31, 2019, respectively.
Summary of Total Stock-based Compensation Expense	Total stock-based compensation expense by function was as follows: Year Ended December 31, 2019 2018 2017 (in thousands) Cost of revenue $ 6,365 $ 4,393 $ 26,071 Research and development 464,639 340,533 1,154,430 Sales and marketing 93,355 84,059 236,474 General and administrative 121,654 109,226 1,222,920 Total $ 686,013 $ 538,211 $ 2,639,895
Restricted Stock Units
Summary of RSU and RSA Award Activity	The following table summarizes the RSU award activity during the year ended December 31, 2019: Class A Outstanding RSUs Class B Outstanding RSUs Weighted- Average Grant Date Fair Value per RSU (in thousands, except per share data) Unvested at December 31, 2018 149,638 492 $ 13.34 Granted 89,582 — $ 11.00 Vested (76,983 ) (490 ) $ 12.10 Forfeited (21,622 ) (2 ) $ 13.15 Unvested at December 31, 2019 140,615 — $ 12.57
Restricted Stock Awards
Summary of RSU and RSA Award Activity	The following table summarizes the RSA activity during the year ended December 31, 2019: Class A Outstanding RSAs Weighted- Average Grant Date Fair Value per RSA (in thousands, except per share data) Unvested at December 31, 2018 8,134 $ 7.51 Granted 3,975 $ 12.61 Vested (2,778 ) $ 9.90 Forfeited (1,149 ) $ 5.85 Unvested at December 31, 2019 8,182 $ 9.42

Business Acquisitions and Div_2

Business Acquisitions and Divestitures (Tables)	12 Months Ended
	Dec. 31, 2019
Placed, LLC
Business Acquisition [Line Items]
Summary of Assets and Liabilities on Completion of Divestiture	Placed assets and liabilities on completion of the divestiture were as follows: Total (in thousands) Trademarks, net $ 1,052 Technology, net 14,193 Customer relationships, net 5,246 Goodwill 2,682 Other assets and liabilities, net 3,827 Total $ 27,000
AI Factory, Inc.
Business Acquisition [Line Items]
Summary of Total Purchase Consideration Allocation	The preliminary allocation of acquisition date fair value is estimated as follows: Total (in thousands) Technology $ 16,000 Goodwill 110,734 Other assets acquired and liabilities assumed, net 1,353 Total $ 128,087
Placed, Inc.
Business Acquisition [Line Items]
Summary of Total Purchase Consideration Allocation	The allocation of the total purchase consideration for this acquisition is estimated as follows: Total (in thousands) Cash $ 6,919 Trademarks 2,700 Technology 22,400 Customer relationships 11,800 Goodwill 103,995 Net deferred tax liability (13,520 ) Other assets acquired and liabilities assumed, net 5,296 Total $ 139,590
Zenly
Business Acquisition [Line Items]
Summary of Total Purchase Consideration Allocation	The allocation of the total purchase consideration for this acquisition is estimated as follows: Total (in thousands) Cash $ 22,610 Technology 23,000 Goodwill 154,353 Net deferred tax liability (2,418 ) Other assets acquired and liabilities assumed, net (1,428 ) Total $ 196,117
Other Acquisitions
Business Acquisition [Line Items]
Summary of Total Purchase Consideration Allocation	The allocation of the total purchase consideration for the above other acquisitions in 2017 is as follows: Total (in thousands) Cash $ 1,701 Technology 49,325 Customer relationships 2,100 Goodwill 48,408 Net deferred tax liability (1,976 ) Other assets acquired and liabilities assumed, net 2,382 Total $ 101,940

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 were as follows: Goodwill (in thousands) Balance as of December 31, 2017 $ 639,882 Goodwill acquired 741 Foreign currency translation $ (8,253 ) Balance as of December 31, 2018 $ 632,370 Goodwill acquired 134,255 Goodwill divested (2,682 ) Foreign currency translation (2,790 ) Balance as of December 31, 2019 $ 761,153
Summary of Estimated Useful Lives of Intangible Assets	The estimated useful lives of intangible assets are as follows: Intangible Asset Estimated Useful Life Domain names 5 Years Trademarks 1 to 5 Years Acquired developed technology 4 to 7 Years Customer relationships 2 to 5 Years Patents 3 to 11 Years Intangible assets consisted of the following: December 31, 2019 Weighted- Average Remaining Useful Life - Years Gross Carrying Amount Accumulated Amortization Net (in thousands, except years) Domain names 2.6 $ 5,414 $ 5,200 $ 214 Trademarks — 3,072 3,072 — Acquired developed technology 3.6 175,414 95,921 79,493 Customer relationships — 2,172 2,172 — Patents 5.9 19,710 7,296 12,414 $ 205,782 $ 113,661 $ 92,121 December 31, 2018 Weighted- Average Remaining Useful Life - Years Gross Carrying Amount Accumulated Amortization Net (in thousands except years) Domain names 1.6 $ 5,414 $ 4,283 $ 1,131 Trademarks 1.4 5,772 4,076 1,696 Acquired developed technology 3.8 179,791 78,729 101,062 Customer relationships 2.1 15,572 8,012 7,560 Patents 6.9 19,710 5,105 14,605 $ 226,259 $ 100,205 $ 126,054
Schedule of Estimated Intangible Asset Amortization Expense	As of December 31, 2019, the estimated intangible asset amortization expense for the next five years and thereafter is as follows: Estimated Amortization (in thousands) Year ending December 31, 2020 $ 29,171 2021 23,545 2022 16,879 2023 14,396 2024 6,236 Thereafter 1,894 Total $ 92,121

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Summary of Convertible Notes	The Convertible Amount (in thousands) Liability: Principal $ 1,265,000 Unamortized debt discount and issuance costs (373,224 ) Net carrying amount $ 891,776 Carrying amount of the equity component $ 377,432
Schedule of Interest Expense Recognized Related to Convertible Notes	The following table details interest expense recognized related to the Convertible Notes for the year ended December 31, 2019: Amount (in thousands) Contractual interest expense $ 3,723 Amortization of debt issuance costs 433 Amortization of debt discount 17,364 Total $ 21,520

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Contractual Commitments	The future minimum contractual commitment including commitments less than one year, as of December 31, 2019 for each of the next five years are as follows: Minimum Commitment (in thousands) Year ending December 31, 2020 $ 640,957 2021 684,374 2022 384,596 2023 883 2024 883 Thereafter 214 Total minimum commitments $ 1,711,907

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Components of Lease Cost	The components of lease cost were as follows: Year Ended December 31, 2019 (in thousands) Operating lease expense $ 60,921 Sublease income (4,716 ) Total net lease costs $ 56,205
Summary of Weighted Average Remaining Lease Term and Discount Rate Related to Operating Leases	Lease Term and Discount Rate The weighted-average remaining lease term (in years) and discount rate related to the operating leases were as follows: December 31, 2019 Weighted-average remaining lease term 8.1 Weighted-average discount rate 5.7 %
Present Value of Operating Lease Liabilities	Maturity of Lease Liabilities The present value of our operating lease liabilities as of December 31, 2019 were as follows: Operating Leases (in thousands) Year ending December 31, 2020 $ 60,774 2021 64,822 2022 56,655 2023 52,754 2024 52,458 Thereafter 144,184 Total lease payments $ 431,647 Less: Imputed interest (86,194 ) Present value of lease liabilities $ 345,453

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Summary of Financial Assets Measured at Fair Value on Recurring Basis	The following table sets forth our financial assets as of December 31, 2019 and 2018 that are measured at fair value on a recurring basis during the period: December 31, 2019 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Total Estimated Fair Value (in thousands) Cash $ 416,099 $ — $ — $ 416,099 Level 1 securities: U.S. government securities 1,305,145 604 (49 ) 1,305,700 U.S. government agency securities 269,278 48 (32 ) 269,294 Level 2 securities: Corporate debt securities 28,420 13 (4 ) 28,429 Commercial paper 84,498 — — 84,498 Certificates of deposit 8,785 — — 8,785 Total $ 2,112,225 $ 665 $ (85 ) $ 2,112,805 December 31, 2018 Cost or Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Total Estimated Fair Value (in thousands) Cash $ 279,950 $ — $ — $ 279,950 Level 1 securities: U.S. government securities 735,988 12 (175 ) 735,825 U.S. government agency securities 181,032 4 (36 ) 181,000 Level 2 securities: Corporate debt securities 35,819 1 (18 ) 35,802 Commercial paper 33,193 — — 33,193 Certificates of deposit 13,293 — — 13,293 Total $ 1,279,275 $ 17 $ (229 ) $ 1,279,063

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of Domestic and Foreign Components of Pre-Tax Loss	The domestic and foreign components of pre-tax loss were as follows: Year Ended December 31, 2019 2018 2017 (in thousands) Domestic $ (770,448 ) $ (969,922 ) $ (3,027,580 ) Foreign (262,819 ) (283,442 ) (435,828 ) Loss before income taxes $ (1,033,267 ) $ (1,253,364 ) $ (3,463,408 )
Schedule of Components of Income Tax (Benefit) Expense	The components of our income tax (benefit) expense were as follows: Year Ended December 31, 2019 2018 2017 (in thousands) Current: Federal $ — $ — $ — State 113 106 (1,784 ) Foreign 771 2,824 932 Total current income tax (benefit) expense 884 2,930 (852 ) Deferred: Federal (277 ) (15 ) (12,287 ) State (85 ) (40 ) 303 Foreign (129 ) (328 ) (5,506 ) Total deferred income tax (benefit) expense (491 ) (383 ) (17,490 ) Income tax (benefit) expense $ 393 $ 2,547 $ (18,342 )
Summary of Reconciliation of Statutory Federal Income Tax Rate	The following is a reconciliation of the statutory federal income tax rate to our effective tax rate: Year Ended December 31, 2019 2018 2017 Tax benefit (expense) computed at the federal statutory rate 21.0 % 21.0 % 34.0 % State tax benefit (expense), net of federal benefit 7.6 5.1 3.0 Change in valuation allowance (38.5 ) (28.4 ) (25.4 ) U.S. corporate tax rate reduction — 0.2 (11.4 ) Differences between U.S. and foreign tax rates on foreign income (1.0 ) (0.9 ) (2.4 ) Stock-based compensation benefit (expense) 0.8 (1.2 ) 1.1 U.S. federal research & development credit benefit 6.3 5.2 1.4 Acquisitions and divestitures 3.4 0.2 — Other benefits (expenses) 0.4 (1.4 ) 0.2 Total income tax benefit (expense) 0.0 % (0.2 )% 0.5 %
Summary of Significant Components of Net Deferred Tax Balances	The significant components of net deferred tax balances were as follows: Year Ended December 31, 2019 2018 (in thousands) Deferred tax assets: Accrued expenses $ 31,746 $ 21,056 Intangible assets 172,228 140,494 Stock-based compensation 134,489 254,255 Loss carryforwards 1,201,569 849,224 Tax credit carryforwards 337,497 235,300 Property and equipment — 203 Lease liability 84,154 — Other 2,485 1,298 Total deferred tax assets $ 1,964,168 $ 1,501,830 Deferred tax liabilities: Property and equipment $ (1,420 ) $ — Convertible debt (87,904 ) — Right-of-use asset (63,595 ) — Total deferred tax liabilities $ (152,919 ) $ — Total net deferred tax assets before valuation allowance 1,811,249 1,501,830 Valuation allowance (1,811,666 ) (1,502,346 ) Net deferred taxes $ (417 ) $ (516 )
Summary of Activity Related to Gross Unrecognized Tax Benefits	The following table summarizes the activity related to our gross unrecognized tax benefits during the years ended December 31, 2019 and 2018: Year Ended December 31, 2019 2018 (in thousands) Beginning balance of unrecognized tax benefits $ 251,808 $ 203,177 Additions for current year tax positions 40,221 43,197 Additions for prior year tax positions 1,977 7,615 Reductions for prior year tax positions (7,425 ) (1,965 ) Changes due to foreign currency translation adjustments 24 (216 ) Ending balance of unrecognized tax benefits (excluding interest and penalties) $ 286,605 $ 251,808 Interest and penalties associated with unrecognized tax benefits 200 260 Ending balance of unrecognized tax benefits (including interest and penalties) $ 286,805 $ 252,068

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)	The table below presents the changes in accumulated other comprehensive income (loss) (“AOCI”) by component and the reclassifications out of AOCI: Changes in Accumulated Other Comprehensive Income (Loss) by Component Marketable Securities Foreign Currency Translation Total (in thousands) Balance at December 31, 2018 $ (368 ) $ 3,515 $ 3,147 OCI before reclassifications 873 (3,371 ) (2,498 ) Amounts reclassified from AOCI (1) (76 ) — (76 ) Net current period OCI 797 (3,371 ) (2,574 ) Balance at December 31, 2019 $ 429 $ 144 $ 573 (1 ) Realized gains and losses on marketable securities are reclassified from AOCI into other income (expense), net in the consolidated statements of operations.

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Summary of Property and Equipment, Net	Property and equipment, net, consisted of the following: As of December 31, 2019 2018 (in thousands) Computer hardware and software $ 27,528 $ 27,920 Buildings — 54,050 Leasehold improvements 165,150 107,265 Furniture and equipment 85,366 75,570 Construction in progress 8,183 14,751 Total 286,227 279,556 Less: accumulated depreciation and amortization (112,560 ) (66,996 ) Property and equipment, net $ 173,667 $ 212,560
Property and Equipment, Net by Geographic Area	The following table lists property and equipment, net by geographic area: As of December 31, 2019 2018 (in thousands) Property and equipment, net: United States $ 153,771 $ 190,412 Rest of world (1) 19,896 22,148 Total property and equipment, net $ 173,667 $ 212,560 (1) No individual country exceeded 10% of our total property and equipment, net for any period presented.

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities at December 31, 2019 and 2018 consisted of the following: As of December 31, 2019 2018 (in thousands) Accrued infrastructure costs $ 116,184 $ 94,819 Securities class actions legal charges 100,000 — Accrued compensation and related expenses 43,985 41,610 Partner revenue share liability 30,606 37,642 Deferred revenue 20,082 10,957 Other 99,753 76,787 Total accrued expenses and other current liabilities $ 410,610 $ 261,815
Schedule of Other liabilities	Other liabilities at December 31, 2019 and 2018 consisted of the following: As of December 31, 2019 2018 (in thousands) Sublease liability $ — $ 32,057 Deferred rent — 28,370 Lease incentive liability — 25,880 Other 57,382 24,109 Total other liabilities $ 57,382 $ 110,416

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)$ / sharesshares	Mar. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)	Mar. 31, 2019USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net proceeds from initial public offering | $			$ 0	$ 0	$ 2,657,797,000
Stock-based compensation expense | $			686,013,000	538,211,000	2,639,895,000
Tax withholding obligation | $			0	551,000	394,156,000
Advertising revenue-share cost | $			$ 174,700,000	$ 120,300,000	$ 96,300,000
Type of Cost, Good or Service [Extensible List]			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Advertising cost | $			$ 31,400,000	$ 11,300,000	$ 10,900,000
Percentage of tax benefits likelihood of being realized			greater than 50%
Highly liquid investments with original maturities			90 days or less
Number of operating segment | $			1	1	1
Number of reporting unit | $			1	1	1
Goodwill impairment charges | $			$ 0	$ 0	$ 0
Operating lease right-of-use assets | $			275,447,000
Operating lease, liability | $			$ 345,453,000
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets | $						$ 284,500,000
Operating lease, liability | $						$ 375,400,000
Computer Hardware and Software
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life			3 years
Furniture and Equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life			5 years
Minimum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life			25 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Business combination measurement period			1 year
Maximum | Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful life			45 years
Pre-2017 RSUs
Summary Of Significant Accounting Policies [Line Items]
Initial public offering price per share | $ / shares			$ 17
Shares withheld for payroll taxes | shares		12,100,000
Common stock issued | shares			26,700,000
Tax withholding obligation | $		$ 206,600,000
Pre-2017 RSUs | First Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			10.00%
Pre-2017 RSUs | Second Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			20.00%
Pre-2017 RSUs | Third Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			30.00%
Pre-2017 RSUs | Fourth Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			40.00%
Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Share based compensation arrangement by share based payment award vesting | shares			9,400,000	22,400,000
Post-2017 RSUs
Summary Of Significant Accounting Policies [Line Items]
Service condition satisfied, years			4 years
Post-2017 RSUs | First Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			10.00%
Post-2017 RSUs | Second Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			20.00%
Post-2017 RSUs | Third Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			30.00%
Post-2017 RSUs | Fourth Year
Summary Of Significant Accounting Policies [Line Items]
Award vesting percentage			40.00%
IPO | Pre-2017 RSUs
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense | $			$ 1,300,000,000
Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock issued | shares			1,160,127,014	999,304,000
Class A Common Stock | Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Share based compensation arrangement by share based payment award vesting | shares			76,983,000
Class A Common Stock | IPO
Summary Of Significant Accounting Policies [Line Items]
Common stock, shares issued and sold | shares	160,300,000		160,300,000
Initial public offering price per share | $ / shares	$ 17	$ 17
Net proceeds from initial public offering | $	$ 2,600,000,000
Underwriting discounts and commissions | $	68,100,000
Other stock offering expenses | $	$ 14,700,000
Class B Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock issued | shares			24,521,607	93,845,000
Class B Common Stock | Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Share based compensation arrangement by share based payment award vesting | shares			490,000
Class B Common Stock | Convertible Preferred Stock Other Than Series FP Preferred Stock | IPO
Summary Of Significant Accounting Policies [Line Items]
Conversion of convertible preferred stock into common stock | shares	246,800,000
Class C Common Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock issued | shares			231,147,476	224,611,000
Class C Common Stock | CEO
Summary Of Significant Accounting Policies [Line Items]
Common stock issued | shares				15,600,000
Shares to be issued in future periods | shares				21,800,000
Class C Common Stock | IPO | CEO
Summary Of Significant Accounting Policies [Line Items]
Common stock issued | shares			28,000,000
Shares to be issued in future periods | shares			9,400,000
Class C Common Stock | IPO | Restricted Stock Units | CEO
Summary Of Significant Accounting Policies [Line Items]
Initial public offering price per share | $ / shares			$ 17
Stock-based compensation expense | $			$ 636,600,000
Percentage of outstanding shares			3.00%
Share based compensation arrangement by share based payment award vesting | shares			37,400,000
Vested awards, distribution period			3 years
Vested awards, distribution description			The CEO award vested immediately on the closing of the IPO, and such shares are being delivered to the CEO in quarterly installments over three years which began in November 2017.
Class C Common Stock | Series FP Preferred Stock | IPO
Summary Of Significant Accounting Policies [Line Items]
Conversion of convertible preferred stock into common stock | shares	215,900,000
Class C Common Stock | Series FP Preferred Stock | IPO | Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Conversion of convertible preferred stock into common stock | shares			37,400,000
Class C Common Stock | Series FP Preferred Stock | IPO | Restricted Stock Units | CEO
Summary Of Significant Accounting Policies [Line Items]
Conversion of convertible preferred stock into common stock | shares			37,400,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2019
Domain Names
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Trademarks | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	1 year
Trademarks | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Acquired Developed Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	4 years
Acquired Developed Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	7 years
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	2 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	11 years

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,715,534	$ 1,180,446	$ 824,949
North America
Disaggregation Of Revenue [Line Items]
Total revenue	1,068,108	780,992	675,402
Europe
Disaggregation Of Revenue [Line Items]
Total revenue	299,913	183,077	98,047
Rest of World
Disaggregation Of Revenue [Line Items]
Total revenue	$ 347,513	$ 216,377	$ 51,500

Revenue - Disaggregation of R_2

Revenue - Disaggregation of Revenue by Geography (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,715,534	$ 1,180,446	$ 824,949
United States
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,000,000	$ 752,900	$ 643,000

Net Loss per Share - Additional

Net Loss per Share - Additional Information (Details) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Earnings Per Share [Line Items]
Net proceeds from initial public offering		$ 0	$ 0	$ 2,657,797
IPO | Class A Common Stock
Earnings Per Share [Line Items]
Common stock, shares issued and sold | shares	160.3	160.3
Initial public offering price per share | $ / shares	$ 17
Net proceeds from initial public offering	$ 2,600,000
Underwriting discounts and commissions	68,100
Other stock offering expenses	$ 14,700
Convertible Preferred Stock Other Than Series FP Preferred Stock | IPO | Class B Common Stock
Earnings Per Share [Line Items]
Conversion of convertible preferred stock into common stock | shares	246.8
Series FP Preferred Stock | IPO | Class C Common Stock
Earnings Per Share [Line Items]
Conversion of convertible preferred stock into common stock | shares	215.9
Conversion ratio		1
Series D, E, and F Preferred Stock | IPO | Class B Common Stock
Earnings Per Share [Line Items]
Conversion ratio		1
Series A, A-1, B, and C Preferred Stock | IPO | Class B Common Stock
Earnings Per Share [Line Items]
Conversion ratio		1

Net Loss per Share - Numerators

Net Loss per Share - Numerators and Denominators of Basic and Diluted Net Loss per Share Computations for Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss	$ (1,033,660)	$ (1,255,911)	$ (3,445,066)
Basic shares:
Weighted-average common shares - Basic	1,375,462	1,300,568	1,166,085
Diluted shares:
Weighted-average common shares - Diluted	1,375,462	1,300,568	1,166,085
Net loss per share attributable to common stockholders:
Basic	$ (0.75)	$ (0.97)	$ (2.95)
Diluted	$ (0.75)	$ (0.97)	$ (2.95)
Class A Common Stock
Numerator:
Net loss	$ (817,156)	$ (921,235)	$ (2,169,120)
Net loss attributable to common stockholders	$ (817,156)	$ (921,235)	$ (2,169,120)
Basic shares:
Weighted-average common shares - Basic	1,087,366	953,992	734,203
Diluted shares:
Weighted-average common shares - Diluted	1,087,366	953,992	734,203
Net loss per share attributable to common stockholders:
Basic	$ (0.75)	$ (0.97)	$ (2.95)
Diluted	$ (0.75)	$ (0.97)	$ (2.95)
Class B Common Stock
Numerator:
Net loss	$ (33,341)	$ (94,897)	$ (548,098)
Net loss attributable to common stockholders	$ (33,341)	$ (94,897)	$ (548,098)
Basic shares:
Weighted-average common shares - Basic	44,366	98,271	185,520
Diluted shares:
Weighted-average common shares - Diluted	44,366	98,271	185,520
Net loss per share attributable to common stockholders:
Basic	$ (0.75)	$ (0.97)	$ (2.95)
Diluted	$ (0.75)	$ (0.97)	$ (2.95)
Class C Common Stock
Numerator:
Net loss	$ (183,164)	$ (239,779)	$ (727,848)
Net loss attributable to common stockholders	$ (183,164)	$ (239,779)	$ (727,848)
Basic shares:
Weighted-average common shares - Basic	243,730	248,305	246,362
Diluted shares:
Weighted-average common shares - Diluted	243,730	248,305	246,362
Net loss per share attributable to common stockholders:
Basic	$ (0.75)	$ (0.97)	$ (2.95)
Diluted	$ (0.75)	$ (0.97)	$ (2.95)

Net Loss per Share - Numerato_2

Net Loss per Share - Numerators and Denominators of Basic and Diluted Net Loss per Share Computations for Common Stock (Parenthetical) (Details) - IPO - shares shares in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2019
Class B Common Stock | Series A, A-1, B, and C Preferred Stock
Earnings Per Share [Line Items]
Conversion of convertible preferred stock into common stock		163
Class C Common Stock | Series FP Preferred Stock
Earnings Per Share [Line Items]
Conversion of convertible preferred stock into common stock	215.9
Class C Common Stock | Series FP Preferred Stock | Restricted Stock Units
Earnings Per Share [Line Items]
Conversion of convertible preferred stock into common stock		37.4
Class A Common Stock
Earnings Per Share [Line Items]
Common stock, shares issued	160.3	160.3

Net Loss per Share - Schedule o

Net Loss per Share - Schedule of Potentially Dilutive Shares Excluded from Calculation of Diluted Net Loss per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	10,262	16,291	32,596
Unvested Restricted Stock Units And Restricted Stock Awards Not Subject To A Performance Condition
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	148,797	158,264	163,796
Convertible Notes (If Converted)
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	55,468

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)Plan$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of share-based employee compensation plans | Plan	3
Weighted-average fair value of employee stock options | $ / shares	$ 14.69	$ 6.99
Fair values of options vested | $	$ 23.3	$ 24.8	$ 58.6
Intrinsic values of stock options exercised | $	$ 44	289.1	276.5
Maximum | 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of capital stock outstanding	5.00%
Shares reserved for issuance, automatic increase date	Jan. 1, 2027
Minimum | 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance, automatic increase date	Jan. 1, 2018
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average recognition period	2 years
Unrecognized compensation cost related to stock options granted and assumed | $	$ 17.7
Stock Options | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum term for stock options from the grant date	10 years
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of vested shares | $	$ 937.2	$ 884.1	966
RSUs are vested but not settled	9,400,000	22,400,000
Pre-2017 RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued	26,700,000
Unrecognized compensation cost | $	$ 34.5
Weighted average recognition period	9 months 18 days
Post-2017 RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost | $	$ 1,400
Weighted average recognition period	2 years 10 months 24 days
RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of vested shares | $	$ 27.5	$ 6.3	$ 1.6
Unrecognized compensation cost | $	$ 74.2
Weighted average recognition period	3 years 3 months 18 days
Class A Non-voting Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock authorized to issue	3,000,000,000	3,000,000,000
Common stock par value | $ / shares	$ 0.00001	$ 0.00001
Common stock voting rights	no voting rights
Common stock dividends declared | $ / shares	$ 0
Common stock issued	1,160,127,014	999,304,000
Common stock outstanding	1,160,127,014	999,304,000
Class A Non-voting Common Stock | 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	87,270,108
Class A Non-voting Common Stock | 2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	17,858,235
Class A Non-voting Common Stock | 2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	11,004,580
Class A Non-voting Common Stock | 2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	16,484,690
Number of shares issued or offered under plan	0
Class A Non-voting Common Stock | Maximum | 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional common stock reserved for future issuance	86,737,997
Class A Non-voting Common Stock | Maximum | 2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance, automatic increase date	Jan. 1, 2027
Percentage of number of shares, common stock outstanding	1.00%
Increase in number of shares reserved for issuance	15,000,000
Class A Non-voting Common Stock | Minimum | 2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance, automatic increase date	Jan. 1, 2018
Class A Non-voting Common Stock | 2014 Equity Incentive Plan | Maximum | France
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees and consultants	2,500,000
Class A Non-voting Common Stock | Stock Options And Unvested RSUs | 2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	96,993,064
Class A Non-voting Common Stock | Stock Options And Unvested RSUs | 2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	37,228,865
Class A Non-voting Common Stock | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees and consultants	89,582,000
RSUs are vested but not settled	76,983,000
Class A Non-voting Common Stock | RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees and consultants	3,975,000
RSUs are vested but not settled	2,778,000
Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock authorized to issue	700,000,000	700,000,000
Common stock par value | $ / shares	$ 0.00001	$ 0.00001
Common stock voting rights	one vote
Common stock dividends declared | $ / shares	$ 0
Common stock issued	24,521,607	93,845,000
Common stock outstanding	24,521,607	93,845,000
Class B Common Stock | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs are vested but not settled	490,000
Class C Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock authorized to issue	260,887,848	260,888,000
Common stock par value | $ / shares	$ 0.00001	$ 0.00001
Common stock voting rights	ten votes
Common stock dividends declared | $ / shares	$ 0
Common stock issued	231,147,476	224,611,000
Common stock outstanding	231,147,476	224,611,000

Stockholders' Equity - Summary

Stockholders' Equity - Summary of RSU and RSA Award Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Outstanding Restricted Stock
Outstanding Restricted Stock, Vested	(9,400)	(22,400)
Weighted-Average Grant Date Fair Value per Restricted Stock
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance	$ 13.34
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted	11
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested	12.10
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited	13.15
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance	$ 12.57	$ 13.34
Restricted Stock Units | Class A Common Stock
Outstanding Restricted Stock
Outstanding Restricted Stock, Unvested Beginning Balance	149,638
Outstanding Restricted Stock, Granted	89,582
Outstanding Restricted Stock, Vested	(76,983)
Outstanding Restricted Stock, Forfeited	(21,622)
Outstanding Restricted Stock, Unvested Ending Balance	140,615	149,638
Restricted Stock Units | Class B Common Stock
Outstanding Restricted Stock
Outstanding Restricted Stock, Unvested Beginning Balance	492
Outstanding Restricted Stock, Vested	(490)
Outstanding Restricted Stock, Forfeited	(2)
Outstanding Restricted Stock, Unvested Ending Balance		492
Restricted Stock Awards
Weighted-Average Grant Date Fair Value per Restricted Stock
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance	$ 7.51
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted	12.61
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested	9.90
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited	5.85
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance	$ 9.42	$ 7.51
Restricted Stock Awards | Class A Common Stock
Outstanding Restricted Stock
Outstanding Restricted Stock, Unvested Beginning Balance	8,134
Outstanding Restricted Stock, Granted	3,975
Outstanding Restricted Stock, Vested	(2,778)
Outstanding Restricted Stock, Forfeited	(1,149)
Outstanding Restricted Stock, Unvested Ending Balance	8,182	8,134

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Beginning balance	$ 7.83
Weighted-Average Exercise Price, Granted	14.69
Weighted-Average Exercise Price, Exercised	3.53
Weighted-Average Exercise Price, Forfeited	13.87
Weighted-Average Exercise Price, Ending balance	9	$ 7.83
Weighted-Average Exercise Price, Exercisable	8
Weighted-Average Exercise Price, Vested and expected to vest	$ 8.91
Weighted-Average Remaining Contractual Term
Weighted-Average Remaining Contractual Term (in years)	5 years 7 months 2 days	6 years 4 months 28 days
Weighted-Average Remaining Contractual Term (in years)	4 years 7 months 24 days
Weighted-Average Remaining Contractual Term (in years)	5 years 6 months 14 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding	$ 34,567
Aggregate Intrinsic Value, Outstanding	75,460	$ 34,567
Aggregate Intrinsic Value, Exercisable	63,445
Aggregate Intrinsic Value, Vested and expected to vest	$ 74,825
Class A Common Stock
Number of Shares
Number of Shares, Beginning balance	13,322
Number of Shares, Granted	118
Number of Shares, Exercised	(3,291)
Number of Shares, Forfeited	(1,437)
Number of Shares, Ending balance	8,712	13,322
Number of Shares, Exercisable	6,053
Number of Shares, Vested and expected to vest	8,508
Class B Common Stock
Number of Shares
Number of Shares, Beginning balance	2,969
Number of Shares, Exercised	(1,389)
Number of Shares, Forfeited	(30)
Number of Shares, Ending balance	1,550	2,969
Number of Shares, Exercisable	1,550
Number of Shares, Vested and expected to vest	1,550

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 686,013	$ 538,211	$ 2,639,895
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	6,365	4,393	26,071
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	464,639	340,533	1,154,430
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	93,355	84,059	236,474
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 121,654	$ 109,226	$ 1,222,920

Business Acquisitions and Div_3

Business Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended	10 Months Ended	12 Months Ended
	Jun. 30, 2019	Jul. 31, 2017	May 31, 2017	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group including discontinued operation, purchase consideration						$ 73,796	$ 0	$ 0
Goodwill deductible for tax purposes					$ 30,300			30,300
RSUs to certain continuing employees in exchange for future service				$ 71,300		71,300
RSUs and RSAs to certain continuing employees in exchange for future service					171,100			171,100
Acquired Developed Technology
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets deductible for tax purposes					40,100			40,100
Customer Relationships
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets deductible for tax purposes					1,600			1,600
Placed, LLC
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group including discontinued operation, cash consideration	$ 77,800
Disposal group including discontinued operation, purchase consideration	66,900
Placed, LLC | Other Income (Expense)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group including discontinued operation, net gain on disposal	$ 39,900
AI Factory, Inc.
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Current and future cash consideration payments				128,100		128,100
Estimated fair value of minority interest				13,500		13,500
Other Acquisitions
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total purchase consideration				34,000	101,900
Goodwill deductible for tax purposes				$ 23,500		$ 23,500
Business acquisition, purchase price cash consideration					95,300
Other Acquisitions | Other Liabilities
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Purchase consideration, liabilities assumed					$ 6,600			$ 6,600
Placed, Inc.
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total purchase consideration		$ 139,600
Total consideration including compensation paid in cash		185,900
Business acquisition, purchase price cash consideration		135,200
Business acquisition, fair value of assumed options		3,900
Purchase consideration, liabilities assumed		500
Business acquisition, compensation transferred for future employment service		$ 46,300
Zenly
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total purchase consideration			$ 196,100
Total consideration including compensation paid in cash			213,300
Business acquisition, purchase price cash consideration			186,800
Purchase consideration, liabilities assumed			9,300
Business acquisition, compensation transferred for future employment service			$ 17,200

Business Acquisitions and Div_4

Business Acquisitions and Divestitures - Summary of Preliminary Allocation of Acquisition Date Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 761,153	$ 632,370	$ 639,882
AI Factory, Inc.
Business Acquisition [Line Items]
Goodwill	110,734
Other assets acquired and liabilities assumed, net	1,353
Total	128,087
AI Factory, Inc. | Acquired Developed Technology
Business Acquisition [Line Items]
Finite lived intangible assets	$ 16,000

Business Acquisitions and Div_5

Business Acquisitions and Divestitures - Summary of Assets and Liabilities on Completion of Divestiture (Details) - Placed, LLC $ in Thousands	Dec. 31, 2019USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Goodwill	$ 2,682
Other assets and liabilities, net	3,827
Total	27,000
Trademarks, Net
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets	1,052
Technology, Net
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets	14,193
Customer Relationships, Net
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Intangible assets	$ 5,246

Business Acquisitions and Div_6

Business Acquisitions and Divestitures - Summary of Total Purchase Consideration Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2017	May 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 761,153	$ 632,370	$ 639,882
Placed, Inc.
Business Acquisition [Line Items]
Cash				$ 6,919
Goodwill				103,995
Net deferred tax liability				(13,520)
Other assets acquired and liabilities assumed, net				5,296
Total				139,590
Placed, Inc. | Trademarks
Business Acquisition [Line Items]
Finite lived intangible assets				2,700
Placed, Inc. | Acquired Developed Technology
Business Acquisition [Line Items]
Finite lived intangible assets				22,400
Placed, Inc. | Customer Relationships
Business Acquisition [Line Items]
Finite lived intangible assets				$ 11,800
Zenly
Business Acquisition [Line Items]
Cash					$ 22,610
Goodwill					154,353
Net deferred tax liability					(2,418)
Other assets acquired and liabilities assumed, net					(1,428)
Total					196,117
Zenly | Acquired Developed Technology
Business Acquisition [Line Items]
Finite lived intangible assets					$ 23,000
Other Acquisitions
Business Acquisition [Line Items]
Cash			1,701
Goodwill			48,408
Net deferred tax liability			(1,976)
Other assets acquired and liabilities assumed, net			2,382
Total			101,940
Other Acquisitions | Acquired Developed Technology
Business Acquisition [Line Items]
Finite lived intangible assets			49,325
Other Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Finite lived intangible assets			$ 2,100

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, beginning balance	$ 632,370	$ 639,882
Goodwill acquired	134,255	741
Goodwill divested	(2,682)
Foreign currency translation	(2,790)	(8,253)
Goodwill, ending balance	$ 761,153	$ 632,370

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 205,782	$ 226,259
Accumulated Amortization	113,661	100,205
Net	$ 92,121	$ 126,054
Domain Names
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	2 years 7 months 6 days	1 year 7 months 6 days
Gross Carrying Amount	$ 5,414	$ 5,414
Accumulated Amortization	5,200	4,283
Net	$ 214	$ 1,131
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	0 years	1 year 4 months 24 days
Gross Carrying Amount	$ 3,072	$ 5,772
Accumulated Amortization	$ 3,072	4,076
Net		$ 1,696
Acquired Developed Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	3 years 7 months 6 days	3 years 9 months 18 days
Gross Carrying Amount	$ 175,414	$ 179,791
Accumulated Amortization	95,921	78,729
Net	$ 79,493	$ 101,062
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	0 years	2 years 1 month 6 days
Gross Carrying Amount	$ 2,172	$ 15,572
Accumulated Amortization	$ 2,172	8,012
Net		$ 7,560
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life - Years	5 years 10 months 24 days	6 years 10 months 24 days
Gross Carrying Amount	$ 19,710	$ 19,710
Accumulated Amortization	7,296	5,105
Net	$ 12,414	$ 14,605

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 33.4	$ 42.6	$ 31.5

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Estimated Intangible Asset Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]
2020	$ 29,171
2021	23,545
2022	16,879
2023	14,396
2024	6,236
Thereafter	1,894
Net	$ 92,121	$ 126,054

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details)	1 Months Ended			12 Months Ended
	Aug. 31, 2019USD ($)d$ / sharesshares	Aug. 31, 2018USD ($)	Jul. 31, 2016USD ($)	Dec. 31, 2019USD ($)$ / shares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Aug. 06, 2019$ / shares	Feb. 28, 2018USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes, net of issuance costs				$ 1,251,411,000	$ 0	$ 0
Five-Year Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility expiration period			5 years
Maximum borrowing capacity		$ 1,050,000,000	$ 1,100,000,000					$ 1,250,000,000	$ 1,200,000,000
Annual commitment fee			0.10%
Origination fees			$ 0
Credit facility expiration date		2023-08
Amounts outstanding under the credit facility				0
Standby Letters of Credit
Debt Instrument [Line Items]
Outstanding letters of credit				25,500,000
LIBO | Five-Year Senior Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable interest rate (percentage)			0.75%
Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,265,000,000			$ 1,265,000,000
Indenture date	Aug. 9, 2019
Proceeds from issuance of convertible notes, net of issuance costs	$ 1,150,000,000
Interest payment beginning date	Feb. 1, 2020
Debt instrument, interest rate	0.75%
Debt instrument, interest rate terms				Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year.
Debt instrument, maturity date	Aug. 1, 2026
Debt instrument, redemption price percentage	100.00%
Carrying amount of equity component	$ 381,500,000			$ 377,432,000
Effective interest rate	6.22%
Debt issuance costs allocated to equity component	$ 4,100,000
Debt issuance costs allocated to liability component	$ 9,500,000
Debt instrument convertible, amortization period				6 years 7 months 6 days
Cap price, net cost				$ 102,100,000
Convertible Senior Notes | Class A Non-voting Common Stock
Debt Instrument [Line Items]
Shares issued upon conversion of each $1000 principal amount | shares	43.8481
Debt instrument, convertible principal amount used in conversion rate	$ 1,000
Conversion price per share | $ / shares	$ 22.81
Debt instrument convertible, percentage of conversion price	130.00%
Debt instrument convertible, number of trading days | d	20
Debt instrument, redemption price percentage	100.00%
Cap price, per share | $ / shares				$ 32.58
Cap price per share, premium percentage above last reported sale price				100.00%
Last reported sale price, per share | $ / shares							$ 16.29
Convertible Senior Notes | Class A Non-voting Common Stock | Maximum
Debt Instrument [Line Items]
Conversion price per share | $ / shares				$ 32.58
Convertible Senior Notes | Class A Non-voting Common Stock | Minimum
Debt Instrument [Line Items]
Conversion price per share | $ / shares				$ 22.81
Convertible Senior Notes | Class A Non-voting Common Stock | Scenario One
Debt Instrument [Line Items]
Debt instrument convertible, percentage of conversion price	130.00%
Debt instrument convertible, number of trading days | d	20
Debt instrument convertible, number of consecutive trading days | d	30
Convertible Senior Notes | Class A Non-voting Common Stock | Scenario Two
Debt Instrument [Line Items]
Debt instrument, convertible principal amount used in conversion rate	$ 1,000
Debt instrument convertible, number of consecutive trading days | d	10
Debt instrument, convertible, threshold business days	5 days
Convertible Senior Notes | Class A Non-voting Common Stock | Scenario Two | Maximum
Debt Instrument [Line Items]
Debt instrument convertible, percentage of conversion price	98.00%
Convertible Senior Notes | Initial Placement
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,100,000,000
Convertible Senior Notes | Over-Allotment Option
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 165,000,000,000

Long-Term Debt - Summary of Con

Long-Term Debt - Summary of Convertible Notes (Details) - Convertible Senior Notes - USD ($) $ in Thousands	Dec. 31, 2019	Aug. 31, 2019
Debt Instrument [Line Items]
Principal	$ 1,265,000	$ 1,265,000
Unamortized debt discount and issuance costs	(373,224)
Net carrying amount	891,776
Carrying amount of the equity component	$ 377,432	$ 381,500

Long-Term Debt - Schedule of In

Long-Term Debt - Schedule of Interest Expense Recognized Related to Convertible Notes (Details) - Convertible Senior Notes $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 3,723
Amortization of debt issuance costs	433
Amortization of debt discount	17,364
Total	$ 21,520

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2019	Dec. 31, 2019	Jan. 17, 2020	Oct. 31, 2018
Indemnification Agreement
Loss Contingencies [Line Items]
Liabilities recorded		$ 0	$ 0
Securities Class Actions
Loss Contingencies [Line Items]
Legal expense, net of amounts directly covered by insurance		$ 100,000,000
Securities Class Actions | Pending Litigation | Subsequent Event
Loss Contingencies [Line Items]
Loss contingency, expected settlement amount				$ 187,500,000
Google Cloud Platform License Agreement
Loss Contingencies [Line Items]
Purchase commitment, description			The agreement has an initial term of five years and we are required to purchase at least $400.0 million of cloud services in each year of the agreement. For each of the first four years, up to 15% of this amount may be moved to a subsequent year. If we fail to meet the minimum purchase commitment during any year, we are required to pay the difference.
Initial term of agreement	5 years
Minimum amount of services to be purchased in each year	$ 400,000,000
Initial period required to purchase minimum amount of services	4 years
Google Cloud Platform License Agreement | Maximum
Loss Contingencies [Line Items]
Purchase commitment, percentage of minimum purchase requirement that can be moved to subsequent year	15.00%
AWS Enterprise Agreement, Cloud Services
Loss Contingencies [Line Items]
Purchase commitment, description			In March 2016, we entered into the AWS Enterprise Agreement for the use of cloud services from Amazon Web Services, Inc. (“AWS”). Under the agreement, as amended, we are committed to spend an aggregate of $1.1 billion between January 2017 and December 2022 on AWS services ($90.0 million in 2018, $150.0 million in 2019, $215.0 million in 2020, $280.0 million in 2021, and $349.0 million in 2022). If we fail to meet the minimum purchase commitment during any year, we are required to pay the difference. Any such payment may be applied to future use of AWS services during the term, although it will not count towards meeting the future minimum purchase commitments.
Minimum purchase commitment to spend between January 2017 and December 2022					$ 1,100,000,000
Minimum purchase commitment, due in 2018					90,000,000
Minimum purchase commitment, due in 2019					150,000,000
Minimum purchase commitment, due in 2020					215,000,000
Minimum purchase commitment, due in 2021					280,000,000
Minimum purchase commitment, due in 2022					$ 349,000,000

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Contractual Commitments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Commitments And Contingencies Disclosure [Abstract]
2020	$ 640,957
2021	684,374
2022	384,596
2023	883
2024	883
Thereafter	214
Total minimum commitments	$ 1,711,907

Leases - Components of Lease Co

Leases - Components of Lease Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease expense	$ 60,921
Sublease income	(4,716)
Total net lease costs	$ 56,205

Leases - Summary of Weighted Av

Leases - Summary of Weighted Average Remaining Lease Term and Discount Rate Related to Operating Leases (Details)	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term	8 years 1 month 6 days
Weighted-average discount rate	5.70%

Leases - Present Value of Opera

Leases - Present Value of Operating Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
2020	$ 60,774
2021	64,822
2022	56,655
2023	52,754
2024	52,458
Thereafter	144,184
Total lease payments	431,647
Less: Imputed interest	(86,194)
Present value of lease liabilities	$ 345,453

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lessee Lease Description [Line Items]
Lease obligations for additional leases not yet commenced	$ 13.8
Operating leases not yet commenced, start year	2020
Operating leases not yet commenced, end year	2024
Lease exit liability		$ 32.1
Net assets capitalized under leases		$ 48.4
Operating lease liabilities	$ 66.3
Lease liabilities arising from obtaining operating lease right-of-use assets	$ 35.2
Minimum
Lessee Lease Description [Line Items]
Operating leases, terms	1 year
Maximum
Lessee Lease Description [Line Items]
Operating leases, terms	5 years

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value assets transferred from level 1 to level 2	$ 0
Fair value assets transferred from level 2 to level 1	0
Fair value liabilities transferred from level 1 to level 2	0
Fair value liabilities transferred from level 2 to level 1	0
Other-than-temporary impaired investments	0
Level 2 Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible notes	$ 1,300,000

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash, Cost or Amortized Cost	$ 520,317	$ 387,149
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and Marketable securities, Cost or Amortized Cost	2,112,225	1,279,275
Cash and Marketable securities, Gross Unrealized Gains	665	17
Cash and Marketable securities, Gross Unrealized Losses	(85)	(229)
Cash and Marketable Securities, Total Estimated Fair Value	2,112,805	1,279,063
Fair Value, Measurements, Recurring | Cash
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash, Cost or Amortized Cost	416,099	279,950
Cash, Total Estimated Fair Value	416,099	279,950
Fair Value, Measurements, Recurring | Level 1 Securities | U.S. Government Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	1,305,145	735,988
Marketable securities, Gross Unrealized Gains	604	12
Marketable securities, Gross Unrealized Losses	(49)	(175)
Marketable securities, Total Estimated Fair Value	1,305,700	735,825
Fair Value, Measurements, Recurring | Level 1 Securities | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	269,278	181,032
Marketable securities, Gross Unrealized Gains	48	4
Marketable securities, Gross Unrealized Losses	(32)	(36)
Marketable securities, Total Estimated Fair Value	269,294	181,000
Fair Value, Measurements, Recurring | Level 2 Securities | Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	28,420	35,819
Marketable securities, Gross Unrealized Gains	13	1
Marketable securities, Gross Unrealized Losses	(4)	(18)
Marketable securities, Total Estimated Fair Value	28,429	35,802
Fair Value, Measurements, Recurring | Level 2 Securities | Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	84,498	33,193
Marketable securities, Total Estimated Fair Value	84,498	33,193
Fair Value, Measurements, Recurring | Level 2 Securities | Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, Cost or Amortized Cost	8,785	13,293
Marketable securities, Total Estimated Fair Value	$ 8,785	$ 13,293

Income Taxes - Schedule of Dome

Income Taxes - Schedule of Domestic and Foreign Components of Pre-Tax Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic	$ (770,448)	$ (969,922)	$ (3,027,580)
Foreign	(262,819)	(283,442)	(435,828)
Loss before income taxes	$ (1,033,267)	$ (1,253,364)	$ (3,463,408)

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
State	$ 113	$ 106	$ (1,784)
Foreign	771	2,824	932
Total current income tax (benefit) expense	884	2,930	(852)
Deferred:
Federal	(277)	(15)	(12,287)
State	(85)	(40)	303
Foreign	(129)	(328)	(5,506)
Total deferred income tax (benefit) expense	(491)	(383)	(17,490)
Income tax (benefit) expense	$ 393	$ 2,547	$ (18,342)

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Statutory Federal Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Tax benefit (expense) computed at the federal statutory rate	21.00%	21.00%	34.00%
State tax benefit (expense), net of federal benefit	7.60%	5.10%	3.00%
Change in valuation allowance	(38.50%)	(28.40%)	(25.40%)
U.S. corporate tax rate reduction		0.20%	(11.40%)
Differences between U.S. and foreign tax rates on foreign income	(1.00%)	(0.90%)	(2.40%)
Stock-based compensation benefit (expense)	0.80%	(1.20%)	1.10%
U.S. federal research & development credit benefit	6.30%	5.20%	1.40%
Acquisitions and divestitures	3.40%	0.20%
Other benefits (expenses)	0.40%	(1.40%)	0.20%
Total income tax benefit (expense)	0.00%	(0.20%)	0.50%

Income Taxes - Summary of Signi

Income Taxes - Summary of Significant Components of Net Deferred Tax Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accrued expenses	$ 31,746	$ 21,056
Intangible assets	172,228	140,494
Stock-based compensation	134,489	254,255
Loss carryforwards	1,201,569	849,224
Tax credit carryforwards	337,497	235,300
Property and equipment		203
Lease liability	84,154
Other	2,485	1,298
Total deferred tax assets	1,964,168	1,501,830
Deferred tax liabilities:
Property and equipment	(1,420)
Convertible debt	(87,904)
Right-of-use asset	(63,595)
Total deferred tax liabilities	(152,919)
Total net deferred tax assets before valuation allowance	1,811,249	1,501,830
Valuation allowance	(1,811,666)	(1,502,346)
Net deferred taxes	$ (417)	$ (516)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2019	Jan. 01, 2019
Income Taxes [Line Items]
Income tax expense	$ 393,000	$ 2,547,000	$ (18,342,000)
Corporate income tax rate	21.00%	21.00%	34.00%
Property and equipment		$ 203,000
Change in net deferred tax assets before valuation allowance	$ 1,811,249,000	1,501,830,000
Net deferred tax liability	$ 417,000	516,000
Pre-Tax Act U.S. federal net operating loss carry-forwards beginning of expiration year	2031
Pre-Tax Act U.S. state net operating loss carry-forwards beginning of expiration year	2026
U.S. Federal research tax credits beginning of expiration year	2032
Deferred tax assets, valuation allowance	$ 1,811,666,000	1,502,346,000
Gross unrecognized tax benefits, including related interest and penalties	286,805,000	252,068,000
Net unrecognized tax benefits	286,605,000	251,808,000	$ 203,177,000
Amount of tax benefit when gross unrecognized tax benefits realized	$ 2,700,000
Petition review decision period	90 days
Other Liabilities
Income Taxes [Line Items]
Net unrecognized tax benefits	$ 1,500,000	$ 2,700,000
Convertible Notes
Income Taxes [Line Items]
Net deferred tax liability				$ 92,100,000
ASU 2016-12
Income Taxes [Line Items]
Deferred tax assets for operating lease liabilities					$ 90,900,000
Deferred tax liability operating lease right of use assets					69,000,000
Deferred tax assets accrued expenses					14,400,000
Property and equipment					7,500,000
Change in net deferred tax assets before valuation allowance					$ 0
Federal
Income Taxes [Line Items]
Corporate income tax rate	21.00%
Net operating loss carry-forwards	$ 4,000,000,000
Pre-Tax Act operating loss carry-forwards			$ 1,500,000,000
Post-Tax Act operating loss carry-forwards	$ 2,500,000,000
Pre-Tax Act operating loss carry-forwards period			20 years
Percentage of taxable income limitation	80.00%
Federal | Research
Income Taxes [Line Items]
Accumulated research tax credits	$ 225,200,000
State
Income Taxes [Line Items]
Net operating loss carry-forwards	2,300,000,000
State | Research
Income Taxes [Line Items]
Accumulated research tax credits	135,800,000
U.K.
Income Taxes [Line Items]
Net operating loss carry-forwards	$ 1,300,000,000

Income Taxes - Summary of Activ

Income Taxes - Summary of Activity Related to Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Uncertainties [Abstract]
Beginning balance of unrecognized tax benefits	$ 251,808	$ 203,177
Additions for current year tax positions	40,221	43,197
Additions for prior year tax positions	1,977	7,615
Reductions for prior year tax positions	(7,425)	(1,965)
Changes due to foreign currency translation adjustments	24	(216)
Ending balance of unrecognized tax benefits (excluding interest and penalties)	286,605	251,808
Interest and penalties associated with unrecognized tax benefits	200	260
Ending balance of unrecognized tax benefits (including interest and penalties)	$ 286,805	$ 252,068

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Schedules of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	$ 2,310,999	$ 2,992,327
OCI before reclassifications	(2,498)
Amounts reclassified from AOCI	(76)
Total other comprehensive income (loss), net of tax	(2,574)	(11,010)	$ 16,214
Balance, end of period	2,259,913	2,310,999	2,992,327
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	(368)
OCI before reclassifications	873
Amounts reclassified from AOCI	(76)
Total other comprehensive income (loss), net of tax	797
Balance, end of period	429	(368)
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	3,515
OCI before reclassifications	(3,371)
Total other comprehensive income (loss), net of tax	(3,371)
Balance, end of period	144	3,515
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	3,147	14,157	(2,057)
Total other comprehensive income (loss), net of tax	(2,574)	(11,010)	16,214
Balance, end of period	$ 573	$ 3,147	$ 14,157

Property and Equipment, Net - S

Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 286,227	$ 279,556
Less: accumulated depreciation and amortization	(112,560)	(66,996)
Property and equipment, net	173,667	212,560
Computer Hardware and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	27,528	27,920
Buildings
Property Plant And Equipment [Line Items]
Property and equipment, gross		54,050
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	165,150	107,265
Furniture and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	85,366	75,570
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 8,183	$ 14,751

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 87,245	$ 91,648	$ 61,288
Property and Equipment
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 53,800	$ 49,000	$ 29,800

Property and Equipment, Net - P

Property and Equipment, Net - Property and Equipment, Net by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property and equipment, net:
Total property and equipment, net	$ 173,667	$ 212,560
United States
Property and equipment, net:
Total property and equipment, net	153,771	190,412
Rest of World
Property and equipment, net:
Total property and equipment, net	$ 19,896	$ 22,148

Property and Equipment, Net -_2

Property and Equipment, Net - Property and Equipment, Net by Geographic Area (Parenthetical) (Details) - Country	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Geographic Concentrations | Property and Equipment Net | Rest of World
Revenues From External Customers And Long Lived Assets [Line Items]
Number of individual country exceeded 10% of total property and equipment	0	0

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued infrastructure costs	$ 116,184	$ 94,819
Securities class actions legal charges	100,000	0
Accrued compensation and related expenses	43,985	41,610
Partner revenue share liability	30,606	37,642
Deferred revenue	20,082	10,957
Other	99,753	76,787
Total accrued expenses and other current liabilities	$ 410,610	$ 261,815

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Other liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Noncurrent [Abstract]
Sublease liability	$ 0	$ 32,057
Deferred rent	0	28,370
Lease incentive liability	0	25,880
Other	57,382	24,109
Total other liabilities	$ 57,382	$ 110,416

Non-Marketable Investments - Ad

Non-Marketable Investments - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments And Joint Ventures [Abstract]
Carrying value of investment in privately-held companies	$ 55,000,000	$ 43,600,000
Impairment on investment		$ 7,200,000	$ 0
Gain on non-marketable investments	$ 20,800,000

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	Jan. 01, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Benefit plan, maximum annual contributions per employee, percent		100.00%
Expense recognized related to matching contributions		$ 15.4	$ 16.1	$ 12.4
100% Participants Contribution
Defined Benefit Plan Disclosure [Line Items]
Benefit plan, employer matching contribution percentage	100.00%
50% Participants Contribution
Defined Benefit Plan Disclosure [Line Items]
Benefit plan, employer matching contribution percentage	50.00%
Maximum | 100% Participants Contribution
Defined Benefit Plan Disclosure [Line Items]
Benefit plan, employer matching contribution, percent of employees' base salary	3.00%
Maximum | 50% Participants Contribution
Defined Benefit Plan Disclosure [Line Items]
Benefit plan, employer matching contribution, percent of employees' base salary	5.00%
Minimum | 50% Participants Contribution
Defined Benefit Plan Disclosure [Line Items]
Benefit plan, employer matching contribution, percent of employees' base salary	3.00%

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - Securities Class Actions - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Jan. 17, 2020
Subsequent Event [Line Items]
Legal expense, net of amounts directly covered by insurance	$ 100
Pending Litigation | Subsequent Event
Subsequent Event [Line Items]
Loss contingency, expected settlement amount		$ 187.5