Eventbrite (EB) 10-K 7 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Feb. 28, 2019	Sep. 20, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Registrant Name	Eventbrite, Inc.
Entity Central Index Key	1,475,115
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 419.8
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,502,993
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		67,101,088

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 437,892	$ 188,986
Funds receivable	58,697	51,639
Accounts receivable, net	4,069	2,885
Creator signing fees, net	7,324	4,235
Creator advances, net	21,255	17,641
Prepaid expenses and other current assets	16,467	10,662
Total current assets	545,704	276,048
Property, plant and equipment, net	44,219	42,492
Goodwill	170,560	158,766
Acquired intangible assets, net	59,973	79,541
Restricted cash	1,508	3,235
Creator signing fees, noncurrent	9,681	6,186
Creator advances, noncurrent	1,887	2,435
Other assets	3,352	2,134
Total assets	836,884	570,837
Current liabilities
Accounts payable, creators	272,201	228,007
Accounts payable, trade	1,028	1,481
Accrued compensation and benefits	5,586	3,535
Accrued taxes	8,028	2,615
Current portion of term loan	5,635	0
Other accrued liabilities	15,726	10,544
Total current liabilities	308,204	246,182
Build-to-suit lease financing obligation	28,510	29,494
Accrued taxes	15,691	30,047
Redeemable convertible preferred stock warrant liability	0	7,271
Promissory note	0	51,082
Term loans	67,087	26,669
Other liabilities	2,170	1,888
Total liabilities	421,662	392,633
Commitments and contingencies (Note 9)
Redeemable convertible preferred stock, $0.00001 par value; no shares authorized, issued or outstanding as of December 31, 2018; 42,452,188 shares authorized, 41,628,207 shares issued and outstanding, $401,372 liquidation preference as of December 31, 2017	0	334,018
Stockholders’ equity (deficit):
Preferred stock, $0.00001 par value; 100,000,000 shares authorized, no shares issued or outstanding as of December 31, 2018 and 2017	0	0
Common stock, $0.00001 par value; 1,100,000,000 shares authorized, 78,546,874 shares issued and 78,358,394 shares outstanding as of December 31, 2018; 92,057,771 shares authorized, 20,961,921 shares issued and 20,773,441 shares outstanding as of December 31, 2017	0	0
Treasury stock at cost, 188,480 shares as of December 31, 2018 and 2017	(488)	(488)
Additional paid-in capital	718,405	83,291
Accumulated deficit	(302,695)	(238,617)
Total stockholders’ equity (deficit)	415,222	(155,814)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	$ 836,884	$ 570,837

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Redeemable convertible preferred stock, shares authorized (in shares)	0	42,452,188
Redeemable convertible preferred stock, shares issued (in shares)	0	41,628,207
Redeemable convertible preferred stock, shares outstanding (in shares)	0	41,628,207
Redeemable convertible preferred stock, liquidation preference	$ 0	$ 401,372
Preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	1,100,000,000	92,057,771
Common stock, shares issued (in shares)	78,546,874	20,961,921
Common stock, shares outstanding (in shares)	78,358,394	20,773,441
Treasury stock (in shares)	188,480	188,480

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net revenue		$ 291,611	$ 201,597	$ 133,499
Cost of net revenue	[1]	120,653	81,667	55,689
Gross profit		170,958	119,930	77,810
Operating expenses:
Product development	[1]	46,071	30,608	22,723
Sales, marketing and support	[1]	69,780	55,170	48,391
General and administrative	[1]	93,782	67,559	41,749
Total operating expenses	[1]	209,633	153,337	112,863
Loss from operations		(38,675)	(33,407)	(35,053)
Interest expense		(11,295)	(6,462)	(3,513)
Change in fair value of redeemable convertible preferred stock warrant liability		(9,591)	(2,200)	0
Loss on debt extinguishment		(178)	0	0
Other income (expense), net		(3,189)	3,509	(1,695)
Loss before provision for (benefit from) income taxes		(62,928)	(38,560)	(40,261)
Income tax provision (benefit)		1,150	(13)	131
Net loss		$ (64,078)	$ (38,547)	$ (40,392)
Net loss per share, basic and diluted (in dollars per share)		$ (1.71)	$ (1.98)	$ (2.48)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)		37,540	19,500	16,291
Stock-based compensation expense		$ 30,231	$ 10,858	$ 8,531
Cost of net revenue
Operating expenses:
Stock-based compensation expense		429	200	134
Product development
Operating expenses:
Stock-based compensation expense		5,813	2,411	2,020
Sales, marketing and support
Operating expenses:
Stock-based compensation expense		3,570	2,364	1,767
General and administrative
Operating expenses:
Stock-based compensation expense		$ 20,419	$ 5,883	$ 4,610
[1]	(1) Amounts includes stock-based compensation as follows: Year Ended December 31,2018 2017 2016Cost of net revenue$429 $200 $134Product development5,813 2,411 2,020Sales, marketing and support3,570 2,364 1,767General and administrative20,419 5,883 4,610 Total stock-based compensation$30,231 $10,858 $8,531

Consolidated Statements of Rede

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Conversion of Redeemable Convertible Preferred Stock	Conversion of Warrants	Common StockClass A Common Stock	Common StockClass B Common Stock	Common StockConversion of Redeemable Convertible Preferred StockClass B Common Stock	Common StockConversion of WarrantsClass B Common Stock	Treasury Stock	Additional Paid-In Capital	Additional Paid-In CapitalConversion of Redeemable Convertible Preferred Stock	Additional Paid-In CapitalConversion of Warrants	Accumulated Deficit
Redeemable convertible preferred stock, balance (in shares) at Dec. 31, 2015	33,446,250
Redeemable convertible preferred stock, balance at Dec. 31, 2015	$ 200,082
Redeemable convertible preferred stock, balance (in shares) at Dec. 31, 2016	33,446,250
Redeemable convertible preferred stock, balance at Dec. 31, 2016	$ 200,082
Balance (in shares) at Dec. 31, 2015				0	16,022,200			(188,480)
Balance at Dec. 31, 2015	(120,013)			$ 0	$ 0			$ (488)	$ 40,153			$ (159,678)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					599,180
Issuance of common stock upon exercise of stock options	1,439								1,439
Issuance of common stock in acquisitions (in shares)					72,000
Issuance of common stock for acquisitions	478								478
Vesting of early exercised stock options	305								305
Stock-based compensation	9,099								9,099
Net loss	(40,392)											(40,392)
Balance (in shares) at Dec. 31, 2016				0	16,693,380			(188,480)
Balance at Dec. 31, 2016	$ (149,084)			$ 0	$ 0			$ (488)	51,474			(200,070)
Increase (Decrease) in Redeemable Convertible Preferred Stock [Roll Forward]
Issuance of Series G redeemable convertible preferred stock (in shares)	8,181,957
Issuance of Series G redeemable convertible preferred stock	$ 133,936
Redeemable convertible preferred stock, balance (in shares) at Dec. 31, 2017	41,628,207
Redeemable convertible preferred stock, balance at Dec. 31, 2017	$ 334,018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,376,872				1,401,872
Issuance of common stock upon exercise of stock options	$ 1,767								1,767
Issuance of common stock in acquisitions (in shares)					2,678,189
Issuance of common stock for acquisitions	18,243								18,243
Vesting of early exercised stock options	366								366
Stock-based compensation	11,441								11,441
Net loss	(38,547)											(38,547)
Balance (in shares) at Dec. 31, 2017				0	20,773,441			(188,480)
Balance at Dec. 31, 2017	$ (155,814)			$ 0	$ 0			$ (488)	83,291			(238,617)
Increase (Decrease) in Redeemable Convertible Preferred Stock [Roll Forward]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)		(41,628,207)
Conversion of redeemable convertible preferred stock in connection with initial public offering		$ (334,018)
Redeemable convertible preferred stock, balance (in shares) at Dec. 31, 2018	0
Redeemable convertible preferred stock, balance at Dec. 31, 2018	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,727,899				1,727,899
Issuance of common stock upon exercise of stock options	$ 8,108								8,108
Issuance of common stock in connection with the initial public offering, net of underwriting discounts (in shares)				11,500,000
Issuance of common stock in connection with the initial public offering, net of underwriting discounts and commissions	245,985								245,985
Costs related to initial public offering	(5,450)								(5,450)
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)						42,188,624	997,193
Conversion of redeemable convertible preferred stock in connection with initial public offering		$ 334,018	$ 21,465							$ 334,018	$ 21,465
Issuance of common stock for settlement of RSUs (in shares)					802,900
Shares withheld related to net share settlement (in shares)					(391,874)
Shares withheld related to net share settlement	(9,013)								(9,013)
Issuance of common stock in acquisitions (in shares)					757,218
Issuance of common stock for acquisitions	8,832								8,832
Issuance of restricted stock awards (in shares)				2,993
Vesting of early exercised stock options	366								366
Stock-based compensation	30,803								30,803
Net loss	(64,078)											(64,078)
Balance (in shares) at Dec. 31, 2018				11,502,993	66,855,401			(188,480)
Balance at Dec. 31, 2018	$ 415,222			$ 0	$ 0			$ (488)	$ 718,405			$ (302,695)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net loss	$ (64,078)	$ (38,547)	$ (40,392)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	34,608	19,418	7,639
Amortization of creator signing fees	7,086	4,314	2,737
Accretion of term loan	1,718	752	0
Loss on debt extinguishment	178	0	0
Change in fair value of redeemable convertible preferred stock warrant liability	9,591	2,200	0
Change in fair value of term loan embedded derivatives	(2,119)	0	0
Stock-based compensation	30,231	10,858	8,531
Impairment of long-lived assets	3,425	2,715	1,795
Provision for bad debt and creator advances	2,742	921	910
Loss on disposal of fixed assets	99	1,271	20
Deferred income taxes	103	(400)	(58)
Excess tax benefit from stock-based compensation awards	0	(2,258)	0
Changes in operating assets and liabilities, net of impact of acquisitions:
Accounts receivable	(2,092)	(775)	(1,364)
Funds receivable	(6,810)	(18,148)	(9,862)
Creator signing fees, net	(15,973)	(8,600)	(5,980)
Creator advances, net	(5,308)	(5,782)	(4,636)
Prepaid expenses and other current assets	(5,594)	(4,347)	(1,890)
Other assets	(1,643)	668	(307)
Accounts payable, creators	24,523	52,836	37,109
Accounts payable, trade	(507)	386	245
Accrued compensation and benefits	1,791	(333)	1
Accrued taxes	5,039	3,640	(1,253)
Other accrued liabilities	4,256	693	3,939
Accrued taxes, noncurrent	(14,458)	7,027	4,957
Other liabilities	354	1,312	644
Net cash provided by operating activities	7,162	29,821	2,785
Cash flows from investing activities
Purchases of property and equipment	(5,418)	(2,536)	(2,983)
Capitalized internal-use software development costs	(7,232)	(6,142)	(5,483)
Acquisitions, net of cash acquired	12,611	(131,974)	(1,693)
Net cash used in investing activities	(39)	(140,652)	(10,159)
Cash flows from financing activities
Proceeds from initial public offering, net of underwriters' discounts and commissions and offering costs, net of reimbursements	240,965	0	0
Proceeds from exercise of stock options	8,108	1,767	2,903
Excess tax benefit from stock-based compensation awards	0	2,258	0
Taxes paid related to net share settlement of equity awards	(9,013)	0	0
Proceeds from issuance of redeemable convertible preferred stock, net	0	133,936	0
Proceeds from term loans	118,578	30,000	0
Principal payments on debt obligations	(111,071)	(7,788)	0
Prepayment penalties on debt extinguishment	(6,803)	0	0
Payments on capital lease obligations	(78)	(249)	(358)
Payments on lease financing obligations	(630)	(410)	(220)
Net cash provided by financing activities	240,056	159,514	2,325
Net increase (decrease) in cash, cash equivalents and restricted cash	247,179	48,683	(5,049)
Cash, cash equivalents and restricted cash
Beginning of period	192,221	143,538	148,587
End of period	439,400	192,221	143,538
Supplemental cash flow data
Interest paid	7,588	868	0
Income taxes paid, net of refunds	202	144	78
Non-cash investing and financing activities
Vesting of early exercised stock options	366	366	305
Issuance of shares of common stock for acquisitions	8,832	18,243	478
Promissory notes issued in connection with acquisitions	0	57,500	0
Conversion of redeemable convertible preferred stock in connection with initial public offering	21,465	0	0
Issuance of redeemable convertible preferred stock warrants in connection with loan facilities and term loan	4,603	5,071	0
Deferred offering costs included in accounts payable, trade and other accrued liabilities	$ 430	$ 0	$ 0

Organization

Organization	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Description of business Eventbrite, Inc. (Eventbrite or the Company) has built a powerful, broad technology platform to enable creators to solve many challenges associated with creating live experiences. The Company’s platform integrates components needed to seamlessly plan, promote and produce live events, thereby allowing creators to reduce friction and costs, increase reach and drive ticket sales. Initial Public Offering In September 2018, the Company completed its initial public offering (IPO) in which the Company issued and sold 11,500,000 shares of Class A common stock at a public offering price of $23.00 per share, which included 1,500,000 shares sold pursuant to the exercise by the underwriters' option to purchase additional shares. The Company received aggregate net proceeds of $246.0 million from the IPO, net of underwriter discounts and commissions, before deducting offering costs of $5.5 million , net of reimbursements. Immediately prior to the closing of the IPO, (i) all shares of common stock then outstanding were reclassified as Class B Common Stock, (ii) 41,628,207 shares of redeemable convertible preferred stock outstanding converted into 42,188,624 shares of Class B common stock (including additional shares issued upon conversion of our Series G redeemable convertible preferred stock based on the IPO price of $23.00 per share) and (iii) warrants to purchase 933,269 shares of our Series G redeemable convertible preferred stock automatically exercised into 997,193 shares of Class B common stock. See Note 11 and Note 12 for additional details.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Basis of Presentation The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Use of Estimates In order to conform with U.S. GAAP, the Company is required to make certain estimates, judgments and assumptions when preparing its consolidated financial statements. These estimates, judgments and assumptions affect the reported assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reported periods. These estimates include, but are not limited to, the recoverability of creator signing fees and creator advances, the capitalization and estimated useful life of internal-use software, certain assumptions used in the valuation of equity awards, assumptions used in determining the fair value of the redeemable convertible preferred stock warrant liability prior to the IPO, fair value of the term loan derivative liability, assumptions used in determining the fair value of business combinations, the allowance for doubtful accounts, indirect tax reserves and contra-revenue amounts related to fraudulent events, customer disputed transactions and refunds. The Company evaluates these estimates on an ongoing basis. Actual results could differ from those estimates and such differences could be material to the Company’s consolidated financial statements. Emerging Growth Company Status As an emerging growth company (EGC), the Jump-start Our Business Start-ups Act (JOBS Act), allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to other public companies. Comprehensive Loss For all periods presented, comprehensive loss equaled net loss. Therefore, the consolidated statements of comprehensive loss have been omitted from the consolidated financial statements. Segment Information The Company’s Chief Executive Officer (CEO) and Chief Financial Officer (CFO) make up the chief operating decision maker function. This function reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating the Company’s financial performance. Additionally, there are no segment managers or other individuals that are held accountable for results below the consolidated level. Accordingly, the Company has determined that it operates as a single reportable and operating segment. Revenue Recognition Revenue primarily consists of service fees and payment-processing fees (Eventbrite fees) recognized at the time a ticket for an event is sold and processed. The Company’s customers are event creators who are selling tickets for events using the Company’s platform. The creator has the choice of whether to use Eventbrite Payment Processing (EPP) or to use a third-party payment processor, referred to as Facilitated Payment Processing (FPP). Under the EPP option, the Company is the merchant of record and is responsible for processing the transaction and collecting the face value of the ticket and all associated fees at the time the ticket is sold. The Company is also responsible for remitting these amounts collected, less the Company’s fees, to the creators. Under the FPP option, Eventbrite is not responsible for processing the transaction or collecting the face value of the ticket and associated fees. In this case, the Company invoices the creator for all of the Company’s fees. The determination of whether the Company acts as a principal or an agent in a transaction is based on an evaluation of whether the Company has the substantial risks and rewards of ownership under the terms of an arrangement. The Company determined the creator is the primary obligor in a ticketing transaction as the creator is responsible for providing the event for which a ticket is sold and is the party responsible for providing a refund if the event is canceled. The Company’s service provides a platform for the creator and event attendee to transact and to facilitate payment processing of that transaction. The amount that the Company earns for this service is fixed. For the payment processing service, the Company determined that it is the primary obligor because it is acting as the principal in providing the service and has latitude in setting the price of the service. Based on management’s assessment, the Company records revenue on a net basis related to its ticketing service and on a gross basis related to its payment processing service. The Company’s revenue is derived from its service fees and payment processing fees and is recognized as tickets for an event are sold and processed since the Company believes that is when all the following conditions are met: • There is persuasive evidence of an arrangement; • The service has been provided to the creator; • The collection of the fees is reasonably assured; and • The amount of fees to be paid is fixed or determinable. Revenue is presented net of indirect taxes, value-added taxes, creator royalties and reserves for customer refunds, payment chargebacks and estimated uncollectible amounts. If an event is cancelled by a creator, then any obligations to provide refunds to event attendees are the responsibility of that creator. If a creator is unwilling or unable to fulfill their refund obligations, the Company may, at its discretion, provide attendee refunds. Revenue is also presented net of the amortization of creator signing fees. The benefit the Company receives by securing exclusive ticketing and payment processing rights with certain creators from these fees is inseparable from the customer relationship with the creator and accordingly these fees are recorded as a reduction of revenue. Cost of Revenue Cost of revenue consists primarily of payment processing fees, platform and website hosting fees and operational costs, amortization of acquired developed technology, amortization of capitalized internal-use software development costs, field operations costs and allocated customer support costs. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents includes bank deposits and money market funds held with financial institutions. Cash and cash equivalents balances include the face value of tickets sold on behalf of creators and their share of service charges, which amounts are to be remitted to the creators. Such balances were $217.4 million and $179.5 million as of December 31, 2018 and 2017 , respectively. Although creator cash is legally unrestricted, the Company does not utilize creator cash for its own financing or investing activities as the amounts are payable to creators on a regular basis. These amounts due to creators are included in accounts payable, creators on the consolidated balance sheets. The Company also considers all highly liquid investments, including money market funds with an original maturity of three months or less at the date of purchase, to be cash equivalents. The Company has issued letters of credit under lease agreements which have been collateralized with cash. This cash is classified as noncurrent restricted cash on the consolidated balance sheets based on the term of the underlying lease. The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands): December 31, 2018 2017 2016 Cash and cash equivalents $ 437,892 $ 188,986 $ 139,538 Restricted cash 1,508 3,235 4,000 Total cash, cash equivalents and restricted cash $ 439,400 $ 192,221 $ 143,538 Funds Receivable Funds receivable represents cash-in-transit from third-party payment processors that is received by the Company within approximately five business days from the date of the underlying ticketing transaction. The funds receivable balances include the face value of tickets sold on behalf of creators and their share of service charges, which amounts are to be remitted to the creators. Such amounts were $54.8 million and $48.5 million as of December 31, 2018 and 2017 , respectively. Accounts Receivable, Net Accounts receivable, net is comprised of invoiced amounts to creators who use a third-party facilitated payment processor (FPP). For customer accounts receivable balances related to FPP, the Company records accounts receivable at the invoiced amount, net of a reserve to provide for potentially uncollectible amounts. In evaluating the Company’s ability to collect outstanding receivable balances, the Company considers various factors including the age of the balance, the creditworthiness of the customer and the customer’s current financial condition. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified. Property, Plant and Equipment, Net Property, plant and equipment, including assets acquired through capital leases, are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of assets. Maintenance and repair costs are charged to expense as incurred. The estimated useful lives of the Company’s property, plant and equipment are as follows: Estimated Useful Life Building and improvements 30 years Furniture and fixtures 3-5 years Computers and computer equipment 1-2 years Computer software 2-3 years Capitalized internal-use software development costs 2 years Leasehold improvements Shorter of estimated useful life or remaining lease term Fair Value Measurements The Company measures its financial assets and liabilities at fair value at each reporting date using a fair value hierarchy that requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 – Other inputs that are directly or indirectly observable in the marketplace. Level 3 – Unobservable inputs that are supported by little or no market activity. The Company’s money market funds, funds receivable, accounts receivable, accounts payable, other current liabilities and debt approximate their fair value. All of these financial assets and liabilities are Level 1, except for debt, which is Level 2. There are no other Level 1 or Level 2 assets or liabilities recorded at December 31, 2018 and 2017 . The Company measures the redeemable convertible preferred stock warrant liability (as discussed in Note 11) and term loan derivative asset (as discussed in Note 10) at fair value on a recurring basis and determined these are Level 3 financial assets and liabilities, respectively, in the fair value hierarchy. The fair value of the redeemable convertible preferred stock warrants was estimated using a hybrid between a probability-weighted expected return method (PWERM) and option pricing model (OPM), estimating the probability weighted value across multiple scenarios, while using an OPM to estimate the allocation of value within one or more of these scenarios. Under a PWERM, the value of the Company’s various equity securities was estimated based upon an analysis of future values for the Company assuming various future outcomes, including two IPO scenarios and two scenarios contemplating the continued operation of the Company as a privately held enterprise. Guideline public company multiples were used to value the Company under the IPO scenarios. The discounted cash flow method was used to value the Company under the staying private scenarios. Share value for each class of security was based upon the probability-weighted present value of expected future investment returns, considering each of these possible future outcomes, as well as the rights of each share class. The significant unobservable inputs into the valuation model used to estimate the fair value of the redeemable convertible preferred stock warrants include the timing of potential events (IPO) and their probability of occurring, the selection of guideline public company multiples, a discount for the lack of marketability of the preferred and common stock, the projected future cash flows, and the discount rate used to calculate the present-value of the estimated equity value allocated to each share class. The significant unobservable inputs into the valuation model used to estimate the fair value of the term loan derivative asset include the timing of potential events (primarily the IPO), probability of exercise and the discount rate used to calculate the present value of discounted cash flows. Generally, changes in the fair value of the underlying redeemable convertible preferred stock would result in a directionally similar impact to the fair value of the redeemable convertible preferred stock warrant liability. There were no transfers of financial assets or liabilities into or out of Level 1, Level 2 or Level 3 for the years ended December 31, 2018 and 2017 . Leases The Company leases office space and certain computer equipment under noncancelable lease agreements which are accounted for as operating leases. Rent expense is recorded on a straight-line basis over the lease term. If a lease provides for fixed escalations of the minimum rental payments, the difference between the straight-line rent charged to expense and the amount payable under the lease is recognized as deferred rent. The Company considers the nature of renovations and the Company’s involvement during the construction period for leased office space to determine if it should be considered the owner of the construction project during the construction period. If the Company determines that it is the owner of the construction project, it is required to capitalize the fair value of the building as well as the construction costs incurred on its consolidated balance sheet along with a corresponding liability (build-to-suit accounting). Upon occupancy for build-to-suit leases, the Company assesses whether the circumstances qualify for sales recognition under the sale-leaseback accounting guidance. If the lease meets the sale-leaseback criteria, the Company will remove the asset and related financial obligation from the consolidated balance sheet and treat the building lease as an operating lease. If upon completion of construction, the project does not meet the sale-leaseback criteria, the leased property will continue to be treated as a build-to-suit lease asset and financing obligation for financial reporting purposes. Internal-Use Software Development Costs The Company capitalizes certain costs associated with website and application development and software developed or obtained for internal use. Costs incurred in the preliminary stages of development are expensed as incurred. Once software has reached the end of the preliminary project stage, internal and external costs, if direct and incremental, are capitalized until the software is substantially complete and ready for its intended use, including stock-based compensation and other employee benefit costs. Capitalization ceases upon completion of all substantial testing. The Company also capitalizes costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Capitalized costs are included in property and equipment, net in the consolidated balance sheet. Capitalized internal-use software and website development costs are amortized on a straight-line basis over their estimated useful life, which is two years. Amortization expense is recorded in cost of revenue within the consolidated statements of operations. Maintenance and training costs are charged to expense as incurred and included in operating expenses. Business Combinations The Company allocates the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Significant estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired users, acquired technology, trade names from a market participant perspective, useful lives and discount rates. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, which is one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings. Goodwill and Acquired Intangible Assets, Net Goodwill Goodwill represents the excess of the aggregate fair value of the consideration transferred in a business combination over the fair value of the assets acquired, net of liabilities assumed. Goodwill is not amortized but the Company evaluates goodwill impairment of its single reporting unit annually on the first day of the fourth quarter, or more frequently if events or changes in circumstances indicate the goodwill may be impaired. Events or changes in circumstances which could trigger an impairment review include significant changes in the manner of the Company’s use of the acquired assets or the strategy for the Company’s overall business, significant negative industry or economic trends, significant underperformance relative to historical or projected future results of operations, a significant adverse change in the business climate, an adverse action or assessment by a regulator, unanticipated competition or a loss of key personnel. The Company has the option to 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 the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if an entity concludes otherwise, then it is required to perform the first of a two-step impairment test. The first step involves comparing the estimated fair value of the reporting unit with its respective 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. If, however, the fair value of the reporting unit is less than book value, then a second step is required that compares the carrying amount of the goodwill with its implied fair value. The estimate of implied fair value of goodwill may require valuations of certain internally-generated and unrecognized intangible and tangible net assets. If the carrying amount of goodwill exceeds the implied fair value of the goodwill, an impairment loss is recognized in an amount equal to the excess. During the years ended December 31, 2018 and 2017 , the Company assessed qualitative factors and determined additional impairment testing was not required, therefore no goodwill impairment charges have been recorded during these periods. Acquired Intangible Assets, Net Acquired intangible assets, net consists of identifiable intangible assets such as developed technology, customer relationships, and trade names resulting from the Company’s acquisitions. Acquired intangible assets are recorded at fair value on the date of acquisition and amortized over their estimated economic lives following the pattern in which the economic benefits of the assets will be consumed, determined to be straight-line. Acquired intangible assets are presented net of accumulated amortization in the consolidated balance sheet. The Company evaluates the recoverability of its intangible assets for potential impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of these assets is measured by a comparison of the carrying amounts to the future undiscounted cash flows the assets are expected to generate. If such review indicates that the carrying amount of intangible assets is not recoverable, the carrying amount of such assets is reduced to the fair value. Creator Signing Fees, Net Creator signing fees, net represent contractual amounts paid to creators pursuant to event ticketing and payment processing agreements. Creator signing fees are additional incentives paid by the Company to secure exclusive ticketing and payment processing rights with certain creators. These payments are amortized over the life of the contract to which they relate on a straight-line basis. Creator signing fees are presented net of reserves and allowances for potentially unrecoverable amounts on the consolidated balance sheets. Amortization of creator signing fees is recorded as a reduction of revenue in the consolidated statements of operations. Creator Advances, Net Creator advances, net represent contractual amounts paid to creators pursuant to event ticketing and payment processing agreements. Creator advances provide the creator with funds in advance of the event and are subsequently recovered by withholding amounts due to the Company from the sale of tickets until the creator advance has been fully recovered. Creator advances are presented net of reserves and allowances for potentially unrecoverable amounts on the consolidated balance sheets. Impairment of Long-Lived Assets The carrying amounts of long-lived assets, including property and equipment, capitalized internal-use software, creator signing fees, creator advances and acquisition-related intangible assets, are periodically reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable or that the useful life is shorter than originally estimated. Recoverability of assets to be held and used is measured by comparing the carrying amount of an asset to future undiscounted net cash flows the asset is expected to generate over its remaining life. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. If the useful life is shorter than originally estimated, the Company amortizes the remaining carrying value over the revised shorter useful life. Accounts Payable, Creators Accounts payable, creators consists of unremitted ticket sale proceeds, net of Eventbrite service fees and applicable taxes. Amounts are remitted to creators within five business days subsequent to the completion of the related event. In certain situations, at the request of the creator, the Company may remit ticket sale proceeds in advance of the related event. Advertising Advertising costs are charged to expense as incurred. The costs of developing advertising creative and trade show expenses are initially deferred and charged to expense in the period in which the advertising is displayed or the period the trade show occurs. Advertising expenses were $1.6 million , $1.9 million and $2.1 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. Stock-Based Compensation Expense Stock-based compensation expense to employees is measured based on the grant-date fair value of the awards and recognized in the consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (the vesting period of the award). The Company estimates the fair value of stock options granted using the Black-Scholes option pricing model. The Company measures the fair value of RSUs based on the fair value of the underlying shares on the date of grant. Compensation expense is recognized over the vesting period of the applicable award using the straight-line method. The Company estimates forfeitures in order to calculate the stock-based compensation expense. Compensation expense for nonemployee stock options is calculated using the Black-Scholes option pricing model and is recorded as the options vest. Options subject to vesting are revalued periodically over the service period, which is the same as the vesting period. Deferred Offering Costs Deferred offering costs, which consist of direct incremental legal, consulting, banking and accounting fees relating to anticipated equity offerings, are capitalized and offset against proceeds upon the consummation of the offerings within stockholders’ equity. The Company incurred $5.5 million of deferred offering costs in connection with its IPO, which are recorded within stockholders' equity as a reduction of the IPO proceeds. Income Taxes The Company records income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the consolidated financial statements or tax returns. Deferred tax assets and liabilities are measured using enacted tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized. The Company recognizes tax benefits from uncertain tax positions 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. Although the Company believes it has adequately provided for its uncertain tax positions, the Company can provide no assurance that the final tax outcome of these matters will not be materially different. The Company adjusts these allowances when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on the Company’s consolidated financial statements. Foreign Currency Remeasurement The functional currency of the Company’s international subsidiaries is the U.S. dollar. Accordingly, monetary balance sheet accounts are remeasured using exchange rates in effect at the balance sheet dates and non-monetary items are remeasured at historical exchange rates. Revenue and expenses are remeasured at the average exchange rates for the period. Foreign currency remeasurement and transaction gains and losses are included in other income (expense), net in the consolidated statements of operations. The Company recorded foreign currency rate remeasurement losses of $6.5 million , foreign currency rate remeasurement gains of $3.1 million and foreign currency rate remeasurement losses of $2.0 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. Concentrations of Risk Financial instruments potentially exposing the Company to concentrations of credit risk consist primarily of cash, funds receivable, accounts receivable, payments to creators and creator advance payouts. The Company holds its cash with high-credit-quality financial institutions; however, the Company maintains balances in excess of the FDIC insurance limits. The Company does not require their customers to provide collateral to support accounts receivable and maintains an allowance for accounts receivable balances that are doubtful of collection. As of December 31, 2018 and 2017 , there were no customers that represented 10% or more of the Company’s accounts receivable balance and there were no customers that individually exceeded 10% of the Company’s net revenue for any of the years ended December 31, 2018 , 2017 and 2016 , respectively. Redeemable Convertible Preferred Stock Warrants Freestanding warrants to purchase shares of redeemable convertible preferred stock are classified as liabilities on the consolidated balance sheets at their estimated fair value because the underlying shares of redeemable convertible preferred stock are contingently redeemable and, therefore, may obligate the Company to transfer assets at some point in the future. Such warrants are recorded at fair value upon issuance and remeasured to fair value at each reporting period through the consolidated statements of operations. The Company adjusts the redeemable convertible preferred stock warrant liability for changes in estimated fair value until the earlier of the exercise or expiration or the completion of a sale of the Company or an IPO. Upon the completion of the Company's IPO in September 2018, all of the Company's outstanding warrants to purchase shares of redeemable convertible preferred stock were automatically exercised into shares of the Company’s Class B common stock. Net Loss Per Share The Company follows the two-class method when computing net loss per common share when shares are issued that meet the definition of participating securities. The two-class method determines net income (loss) per common share for each class of common stock and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two-class method requires income available to common stockholders for the period to be allocated between common stock and participating securities based upon their respective rights to receive dividends as if all income for the period had been distributed. The Company’s redeemable convertible preferred stock contractually entitles the holders of such shares to participate in dividends but does not contractually require the holders of such shares to participate in the Company’s losses. For periods in which the Company reports net losses, diluted net loss per share is the same as basic net loss per share because potentially dilutive common shares are not assumed to have been issued if their effect is anti-dilutive. Recently Adopted Accounting Pronouncements The Company adopted ASU No. 2016-09, Compensation—Stock Compensation (Topic 718) beginning January 1, 2018. The Company has elected to continue to estimate expected forfeitures as awards are granted. Additionally, the Company will prospectively present excess tax benefits as an operating activity on the consolidated statement of cash flows. The Company recognized the previously unrecognized excess tax benefits using the modified retrospective transition method, which did not result in a cumulative-effect adjustment to the opening balance of accumulated deficit in 2018 given the Company’s valuation allowance position. Without the valuation allowance, the Company’s deferred tax assets would have increased by $3.4 million . The Company adopted ASU 2016-15, Statement of Cash Flows (Topic 230): Clarifying the Classification of Certain Cash Receipts and Cash Payments beginning January 1, 2018 using a retrospective approach. This standard applies to the Company’s reporting requirements in the recording of debt prepayment and debt extinguishment and has been reflected in the consolidated financial statements. Recently Issued Accounting Pronouncements In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350) : Simplifying the Test for Goodwill Impairment , which eliminates the requirement to calculate the i

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions 2018 Acquisitions In August 2018, the Company acquired Picatic e-Ticket Inc. (Picatic), a Canadian ticketing company. The Company acquired Picatic primarily to bolster its engineering staff and enhance its ticketing solutions. The acquisition of Picatic has been accounted for as a business combination . The acquisition date fair value of the consideration transferred was $2.9 million , which consisted of $1.3 million in cash and 81 thousand shares of the Company’s common stock. Acquisition costs directly related to the Picatic transaction were $0.3 million and are included in general and administrative expenses in the consolidated statements of operations for the year ended December 31, 2018 . The total purchase price of the Picatic acquisition was allocated to the assets acquired and liabilities assumed based on their fair value as of the acquisition date. The excess of the purchase price over the net assets acquired was recorded as goodwill. The goodwill recorded in connection with the Picatic acquisition is not deductible for tax purposes and is attributable to the assembled workforce and synergies from the future growth and strategic advantages in the ticketing industry. In April 2018, the Company acquired Ticketea S.L. (Ticketea), a leading Spanish ticketing provider. The Company acquired Ticketea in order to enhance its ticketing solutions and expand in the Spanish market. The acquisition of Ticketea has been accounted for as a business combination . The acquisition date fair value of the consideration transferred was $11.4 million , which consisted of $3.6 million in cash and 0.7 million shares of the Company’s common stock. Of the 0.7 million shares, 0.1 million shares are being held in escrow for adjustments related to working capital requirements and breaches of representations, warranties and covenants. These escrowed shares will be released approximately 18 months from the acquisition date, net of any adjustments. Acquisition costs directly related to the Ticketea transaction were $0.5 million and are included in general and administrative expenses in the consolidated statement of operations for the year ended December 31, 2018 . The total purchase price of the Ticketea acquisition was allocated to the assets acquired and liabilities assumed based on their fair value as of the acquisition date. The excess of the purchase price over the net assets acquired was recorded as goodwill. The goodwill recorded in connection with the Ticketea acquisition is not deductible for tax purposes and is attributable to the assembled workforce and synergies from the future growth and strategic advantages in the ticketing industry. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the respective acquisition dates (in thousands): Picatic Ticketea Total Cash $ 160 $ 17,852 $ 18,012 Funds and accounts receivable 10 1,058 1,068 Creator advances — 532 532 Prepaid expenses and other current assets 87 127 214 Property and equipment — 42 42 Other noncurrent assets — 28 28 Accounts payable, creators — (19,671 ) (19,671 ) Other current liabilities (121 ) (628 ) (749 ) Intangible assets 507 3,094 3,601 Goodwill 2,219 8,937 11,156 Total purchase price $ 2,862 $ 11,371 $ 14,233 The following table sets forth the components of identifiable intangible assets acquired (in thousands) and their estimated useful lives as of the date of acquisition (in years): Picatic Estimated Ticketea Estimated Customer relationships $ 507 2.5 $ 2,475 5.0 Developed technology — 619 1.0 Total acquired intangible assets $ 507 $ 3,094 The amount of net revenue from the Picatic and Ticketea acquisitions included in the consolidated statements of operations for the year ended December 31, 2018 was $3.7 million . 2017 Acquisitions In September 2017, the Company acquired 100% of the outstanding equity of Ticketfly, LLC (Ticketfly), a San Francisco based subsidiary of a publicly-held company. The Company acquired Ticketfly in order to expand the Company’s solutions for music-related events. The acquisition of Ticketfly has been accounted for as a business combination . The acquisition date fair value of the consideration transferred was $201.1 million , which consisted of $151.1 million in cash and $50.0 million in Convertible Promissory Notes (Promissory Note), which were paid and issued, respectively, at the closing of the transaction. The Promissory Note had a five year maturity from the date of issuance and bore interest at a rate of 6.5% per annum. Acquisition costs related to the Ticketfly transaction were $0.5 million and are included in general and administrative expenses in the consolidated statements of operations for the year ended December 31, 2017. In March 2018, the Company reached an agreement with the seller of Ticketfly to repay the Promissory Note. The face value of $50.0 million was settled in full for $34.7 million which represented $33.0 million of principal and $1.7 million of accrued interest. The Company recognized a gain of $17.0 million resulting from the extinguishment of the Promissory Note in the consolidated statements of operations for the year ended December 31, 2018 . As discussed in Note 10, the Company recorded a net loss on debt extinguishment of $0.2 million for the year ended December 31, 2018 . In January 2017, the Company acquired 100% of the outstanding equity of TSTM Group Limited (ticketscript), a privately-held Dutch ticketing company with operations throughout Europe. The Company acquired ticketscript in order to enhance its ticketing solutions. The acquisition of ticketscript has been accounted for as a business combination . The acquisition date fair value of the consideration transferred was $33.4 million , which consisted of $7.7 million in cash, $7.5 million in promissory notes, 2.7 million shares of the Company’s common stock and options to purchase 0.3 million shares of Eventbrite common stock. These promissory notes were allowed to be prepaid at any time and the Company repaid these promissory notes in full, including accrued interest, in August 2017. Acquisition costs related to the ticketscript transaction were $1.2 million and are included in general and administrative expenses in the consolidated statements of operations. The Company retained certain former ticketscript employees under Eventbrite employment contracts and issued options to purchase an aggregate of 0.3 million shares of common stock in connection with those employment contracts. These options vest over time and compensation expense will be recorded over the associated service period. The total purchase prices of the Ticketfly and ticketscript acquisitions were allocated to the assets acquired and liabilities assumed based on their fair value as of the acquisition date. The excess of the purchase price over the net assets acquired was recorded as goodwill. The goodwill recorded in connection with the Ticketfly acquisition is deductible for tax purposes, while the goodwill recorded in connection with ticketscript is not. Goodwill is attributable to the assembled workforce and synergies from the future growth and strategic advantages in the ticketing industry. The following table summarizes the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates (in thousands): Ticketfly ticketscript Total Cash and restricted cash $ 23,339 $ 3,492 $ 26,831 Funds and accounts receivable 4,263 4,208 8,471 Creator advances 8,567 — 8,567 Prepaid expenses and other current assets 1,213 242 1,455 Property and equipment 2,619 425 3,044 Other noncurrent assets 15 238 253 Accounts payable, creators (29,909 ) (7,950 ) (37,859 ) Other current liabilities (2,138 ) (836 ) (2,974 ) Accrued taxes (6,179 ) (1,799 ) (7,978 ) Deferred tax liabilities — (2,401 ) (2,401 ) Intangible assets 76,300 11,800 88,100 Goodwill 123,011 26,030 149,041 Total purchase price $ 201,101 $ 33,449 $ 234,550 The following table sets forth the components of identifiable intangible assets acquired (in thousands) and their estimated useful lives as of the date of acquisition (in years): Ticketfly Estimated useful life ticketscript Estimated useful life Customer relationships $ 60,500 8.0 $ 10,600 5.0 Developed technology 14,500 1.3 1,100 1.0 Trademark 1,300 1.3 100 1.0 Total acquired intangible assets $ 76,300 $ 11,800 The following unaudited pro forma information presents the combined results of operations as if the Ticketfly acquisition had been completed on January 1, 2016, the beginning of the comparable prior annual reporting period. The pro forma results include the adjustments for amortization associated with the acquired intangible assets, interest expense on new debt, stock-based compensation and the inclusion of $0.5 million of non-recurring acquisition costs. The pro forma results do not reflect any cost saving synergies from operating efficiencies of the effect of the incremental costs incurred in integrating the companies. Accordingly, these pro forma results are presented for informational purpose only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisition had occurred at the beginning of the period presented, nor are they indicative of future results of operations (in thousands): Year Ended December 31, 2017 Net revenue $ 235,096 Net loss (199,222 ) Pro forma information for the Ticketea, Picatic and ticketscript acquisitions is not presented as it is not material.

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets, Net	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets, Net	Goodwill and Acquired Intangible Assets, Net The changes in the carrying amounts of goodwill was as follows (in thousands): January 1, 2017 $ 9,725 Additions from acquisitions 149,041 At December 31, 2017 158,766 Additions from acquisitions 11,023 Measurement period and other adjustments 771 At December 31, 2018 $ 170,560 Acquired intangible assets consisted of the following as of the dates indicated (in thousands): December 31, 2017 Cost Accumulated Net Book Weighted- Developed technology $ 18,477 $ 6,679 $ 11,798 1.0 Customer relationships 71,502 4,743 66,759 7.2 Tradenames 1,600 616 984 1.0 Acquired intangible assets, net $ 91,579 $ 12,038 $ 79,541 December 31, 2018 Cost Accumulated Net Book Weighted- Developed technology $ 19,096 $ 18,628 $ 468 0.8 Customer relationships 74,484 14,979 59,505 6.2 Tradenames 1,600 1,600 — 0.0 Acquired intangible assets, net $ 95,180 $ 35,207 $ 59,973 The Company recorded amortization expense related to acquired intangible assets as follows (in thousands): Year Ended December 31, 2018 2017 2016 Cost of net revenue $ 11,834 $ 5,083 $ 470 General and administrative 11,334 5,160 157 Total amortization of acquired intangible assets $ 23,168 $ 10,243 $ 627 As of December 31, 2018 , the total expected future amortization expense of acquired intangible assets by year is as follows (in thousands): 2019 $ 10,825 2020 10,443 2021 10,197 2022 8,202 Thereafter 20,306 Acquired intangible assets, net $ 59,973

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Accounts Receivable, Net	Accounts Receivable, Net Accounts receivable, net is comprised of invoiced amounts to customers who use FPP for payment processing as well as other invoiced amounts. The following table summarizes the Company’s accounts receivable balance (in thousands): December 31, 2018 2017 2016 Accounts receivable, customers $ 5,651 $ 4,682 $ 3,081 Allowance for doubtful accounts (1,582 ) (1,797 ) (1,099 ) Accounts receivable, net $ 4,069 $ 2,885 $ 1,982

Creator Signing Fees, Net

Creator Signing Fees, Net	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Creator Signing Fees, Net	Creator Signing Fees, Net Creator signing fees are additional incentives paid by the Company to secure exclusive ticketing and payment processing rights with certain creators. As of December 31, 2018 , these payments are being amortized over a weighted-average remaining contract life of 3.3 years on a straight-line basis. Amortization of creator signing fees is recorded as a reduction of revenue in the consolidated statements of operations and totaled $7.1 million , $4.3 million and $2.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. The following table summarizes the activity in creator signing fees (in thousands): December 31, 2018 2017 Balance, beginning of period $ 10,421 $ 6,906 Creator signing fees paid 15,973 8,552 Amortization of creator signing fees (7,086 ) (4,314 ) Write-offs and other adjustments (2,303 ) (723 ) Balance, end of period $ 17,005 $ 10,421 Creator signing fees, net $ 7,324 $ 4,235 Creator signing fees, noncurrent 9,681 6,186

Creator Advances, Net

Creator Advances, Net	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Creator Advances, Net	Creator Advances, Net Creator advances provide the creator with funds in advance of the event and are subsequently recovered by withholding amounts due to the Company from the sale of tickets for the event until the creator payment has been fully recovered. The following table summarizes the activity in creator advances for the periods indicated (in thousands): December 31, 2018 2017 Balance, beginning of period $ 20,076 $ 7,583 Acquired with Ticketfly transaction — 8,567 Acquired with Ticketea transaction 532 — Creator advances paid 21,466 14,701 Creator advances recouped (16,158 ) (8,681 ) Write-offs and other adjustments (2,774 ) (2,094 ) Balance, end of period $ 23,142 $ 20,076 Creator advances, net $ 21,255 $ 17,641 Creator advances, noncurrent 1,887 2,435

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consisted of the following as of the dates indicated (in thousands): December 31, 2018 2017 Building and improvements $ 33,277 $ 33,277 Capitalized internal-use software development costs 35,201 27,392 Furniture and fixtures 3,557 3,206 Computers and computer equipment 11,676 9,716 Leasehold improvements 5,084 2,950 88,795 76,541 Less: Accumulated depreciation and amortization (44,576 ) (34,049 ) Property, plant and equipment, net $ 44,219 $ 42,492 Depreciation expense, excluding the amortization of capitalized internal-use software development costs, totaled $5.2 million , $4.1 million and $2.6 million for the years ended December 31, 2018 , 2017 , and 2016 respectively. The Company recorded the following amounts related to capitalized internal-use software development costs during the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Internal-use software development costs capitalized during the period $ 7,809 $ 6,725 $ 6,050 Amortization of capitalized internal-use software 6,240 5,102 4,458 Impairments of capitalized internal-use software — 88 490 Stock-based compensation expense included in capitalized internal-use software development costs was $0.6 million for each of the years ended December 31, 2018 , 2017 and 2016 .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases The Company leases office space under various noncancelable operating leases that expire at various dates through 2028. Rent expense from operating leases totaled $3.0 million , $2.1 million and $1.5 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. The Company also recognized sublease income of $3.6 million , $3.1 million and $3.2 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. Build-to-Suit Lease In December 2013, the Company executed a lease for 97,624 square feet of office space in San Francisco, California. The initial lease term is seven years with an option to renew for an additional three years , and the leased space represents two floors in a seven-floor building. The lease provided for a $6.4 million tenant improvement reimbursement allowance, which the Company utilized in 2014. In order for the facility to meet the Company’s operating specifications, both the landlord and the Company made structural changes as part of the improvement of the building, and as a result, the Company has concluded that it is the deemed partial owner of the building (for accounting purposes only) during the construction period. Accordingly, at lease inception, the Company recorded an asset of $22.3 million , representing its estimate of the fair market value of the leased space, and a corresponding lease financing obligation on the consolidated balance sheets. Upon completion of construction, the Company evaluated the derecognition of the asset and liability as a sale-leaseback transaction. The Company concluded it did not meet the provisions needed for sale-leaseback accounting, and thus the lease is being accounted for as a financing obligation. Lease payments are allocated to (1) a reduction of the principal financing obligation; (2) imputed interest expense; and (3) land lease expense (which is considered an operating lease) representing an imputed cost to lease the underlying land of the facility. In addition, the underlying building asset is being depreciated over the building’s estimated useful life of 30 years . At the conclusion of the lease term, the Company will derecognize both the net book values of the asset and financing obligation. Land lease expense was $0.9 million for each of the years ended December 31, 2018 , 2017 and 2016 . Interest expense related to the Company’s build-to-suit lease was $3.4 million , $3.5 million and $3.5 million for each of the years ended December 31, 2018 , 2017 and 2016 , respectively. As of December 31, 2018 , the future minimum lease payments and sublease rental payments under noncancelable leases are as follows (in thousands): Build-to-Suit Operating Sublease Total 2019 $ 5,604 $ 2,514 $ (4,003 ) $ 4,115 2020 5,772 2,360 (4,003 ) 4,129 2021 1,942 1,870 (1,167 ) 2,645 2022 — 1,678 — 1,678 2023 — 1,483 — 1,483 Thereafter — 3,770 — 3,770 Total minimum payments (income) 13,318 13,675 (9,173 ) 17,820 Less: Amount representing interest and taxes (7,564 ) — — (7,564 ) Total $ 5,754 $ 13,675 $ (9,173 ) $ 10,256 In May 2018, the Company entered into a ten -year operating lease for its office space in Cork, Ireland. The lease expires in 2028. Monthly rent payments, which are included in the table above, are due beginning in January 2019 and total $0.4 million per year. Letters of Credit The Company has issued letters of credit under lease and other agreements, which have been collateralized with cash. This cash is classified as noncurrent restricted cash on the consolidated balance sheets based on the term of the underlying agreements. As of December 31, 2018 , the Company had an outstanding letter of credit for $1.0 million related to its leased office space in San Francisco, California. In connection with the Ticketfly acquisition, the Company acquired a lease for which there was a letter of credit for $0.8 million . This letter of credit was terminated and the related restricted cash became unrestricted in the year ended December 31, 2018 as the underlying lease was terminated. Creator Signing Fees and Creator Advances Creator signing fees and creator advances represent contractual amounts paid in advance to customers pursuant to event ticketing and payment processing agreements. Certain of the Company’s contracts include terms where future payments to creators are committed to as part of the overall ticketing arrangement. The following table presents, by year, the future creator payments committed to under contract but not yet paid as of December 31, 2018 (in thousands): 2019 $ 8,328 2020 3,578 2021 386 2022 19 2023 and thereafter — $ 12,311 Litigation and Loss Contingencies The Company accrues estimates for resolution of legal and other contingencies when losses are probable and estimable. From time to time, the Company may become a party to litigation and subject to claims incident to the ordinary course of business, including intellectual property claims, labor and employment claims, and threatened claims, breach of contract claims, tax and other matters. The Company currently has no material pending litigation. The Company is currently under audit in certain domestic jurisdictions with regard to indirect tax matters. The Company establishes reserves for indirect tax matters when it determines that the likelihood of a loss is probable, and the loss is reasonably estimable. Accordingly, the Company has established a reserve for the potential settlement of issues related to sales and other indirect taxes in the amount of $ 19.2 million and $28.9 million as of December 31, 2018 and 2017, respectively. These amounts, which represent management’s best estimates of its potential liability, include potential interest and penalties of $ 1.2 million and $ 3.5 million as of December 31, 2018 and 2017, respectively. In June 2018, the Company publicly announced that a criminal was able to penetrate the Ticketfly website and steal certain consumer data, including names, email addresses, shipping addresses, billing addresses and phone numbers. For a short time, the Company disabled the Ticketfly platform to contain the risk of the cyber incident, which disabled ticket sales through Ticketfly during that period. Because of this incident, the Company has incurred costs related to responding to and remediating this incident and has suffered a loss of revenue for the period during which the Ticketfly platform was disabled. During the year ended December 31, 2018, the Company recorded an amount of $7.0 million for costs associated with this incident, of which $6.7 million was recorded as a reduction to net revenue and $0.3 million was recorded as an operating expense. This amount represents the Company’s best estimate of the total amount of creator accommodations to be made as a result of the incident. The Company also recorded $6.6 million related to insurance proceeds to be received from the Ticketfly incident as a reduction in general and administrative expenses in the year ended December 31, 2018 . Such proceeds are a partial reimbursement for accommodations to creators which are recorded as contra revenue. As of December 31, 2018, the Company had a remaining liability balance of $0.3 million related to future accommodation payments and a $0.6 million receivable for insurance proceeds. The Company does not believe that any ultimate liability resulting from any of these matters will have a material adverse effect on its business, consolidated financial position, results of operations or liquidity. However, the outcome of these matters is inherently uncertain. Therefore, if one or more of these matters were resolved against the Company for amounts in excess of management’s expectations, the Company’s financial statements, including in a particular reporting period in which any such outcome becomes probable and estimable, could be materially adversely affected. Indemnifications In the ordinary course of business, the Company enters into contractual arrangements under which the Company agrees to provide indemnification of varying scope and terms to business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements, intellectual property infringement claims made by third parties, and other liabilities relating to or arising from the Company’s online ticketing platform or the Company’s acts or omissions. In these circumstances, payment may be conditional on the other party making a claim pursuant to the procedures specified in the particular contract. Further, the Company’s obligations under these agreements may be limited in terms of time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments. In addition, the Company has indemnification agreements with its directors and executive officers that require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The terms of such obligations vary.

Term Loans and Debt

Term Loans and Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Term Loans and Debt	Term Loans and Debt Term loans consisted of the following at the dates indicated (in thousands): December 31, 2018 2017 Outstanding principal balance and accrued interest $ 73,594 $ 29,704 Less: Unamortized discount and debt issuance costs (872 ) (3,035 ) Total term loans $ 72,722 $ 26,669 Current portion of term loans $ 5,635 $ — Term loans 67,087 26,669 The Company entered into a loan and security agreement with, and issued warrants to purchase shares of redeemable convertible preferred stock to Western Technology Investments (WTI) in June 2017 (First WTI Loan Facility), which provided for a secured credit facility of up to $60.0 million of term debt. The First WTI Loan Facility contained customary events of default. In September 2017, the Company borrowed $30.0 million as a term loan under the facility with a maturity date of February 2022 which bore interest at 11.5% annually (effective interest rate of 15.9% ). Monthly payments of interest were due for the first 24 months and equal monthly installments of principal and interest were due for 30 months thereafter. The loan could be prepaid at any time for an amount equal to the outstanding balance plus accrued interest, plus an amount equal to all scheduled but unpaid payments of interest that would have accrued and been payable through the maturity date. In March 2018, the Company borrowed an additional $30.0 million under the First WTI Loan Facility with a maturity date of September 2022, which bore interest at 11.75% annually (effective interest rate of 14.8% ). Monthly payments of interest were due for the first 24 months and equal monthly installments of principal and interest were due for 30 months thereafter. In May 2018, the Company entered into a second loan and security agreement with WTI (Second WTI Loan Facility, and together with the First WTI Loan Facility, the WTI Loan Facilities) and issued additional warrants to purchase shares of Series G redeemable convertible preferred stock. The secured credit facility provided up to $15.0 million of term debt, which the Company borrowed in full as a term loan under the facility in May 2018. This debt bore interest at 12.0% annually (effective interest rate of 14.7% ) and had a maturity date of November 2022. Monthly payments of interest were due for the first 24 months and equal monthly installments of principal and interest were due for 30 months thereafter. The WTI Loan Facilities were collateralized by substantially all of the Company's assets and intellectual property rights. The Second WTI Loan Facility included a contingent prepayment feature under which if the Company consummated a qualified public offering within the first 24 months of the term loan and the Company prepaid the term loan in conjunction with the qualified public offering, the Company would be required to prepay the outstanding contractual balance plus accrued interest within fifteen days of the consummation of a qualified public offering plus an additional amount equal to 50% of all interest that would have been incurred through the end of first 24 months of the loan. In connection with the Second WTI Loan Facility, the Company modified the terms of the First WTI Loan Facility so that the $30.0 million borrowed in March 2018 under the First WTI Loan Facility would be subject to the same contingent prepayment feature in the event of a qualified public offering that is included in the Second WTI Loan Facility. The Company determined that these contingent prepayment features under the WTI term loans are embedded derivative assets, requiring bifurcation and separate accounting. These embedded derivatives initially had a fair value of $2.1 million as determined in May 2018 and immediately prior to the Company's repayment of the WTI debt (discussed below), the fair value of the embedded derivatives was determined to be $4.2 million . During the year ended December 31, 2018, the Company recorded the $2.1 million change in fair value of the term loan embedded derivatives in other income (expense), net on the consolidated statements of operations. In September 2018, five days after the completion of the IPO, the Company exercised its prepayment option and fully repaid all amounts outstanding under the WTI Loan Facilities. The Company made a total cash payment of $81.6 million , consisting of $74.2 million of contractual principal and $7.4 million in prepayment penalties. The carrying value of the WTI Loan Facilities at the time of retirement was $68.7 million . This is less than the contractual principal paid to retire the debt due to (i) the fair value of the redeemable convertible preferred stock warrants that were issued in connection with the WTI Loan Facilities, which was bifurcated and accounted for as a discount to the face value of the WTI debt; and (ii) the fair value of the term loan embedded derivative which was bifurcated and accounted for as a premium to the face value of the WTI debt. In connection with the retirement of the WTI Loan Facilities, the Company recorded a loss on debt extinguishment of $17.2 million . Refer to Note 3 for discussion of the Company's gain on debt extinguishment recorded in connection with the retirement of the Promissory Note, resulting in a total net loss on debt extinguishment of $0.2 million for the year ended December 31, 2018. As of December 31, 2018 , there are no amounts outstanding under the WTI Loan Facilities and all underlying agreements have been terminated. In September 2018, the Company entered into a senior secured credit facility with a syndicate of banks consisting of $75.0 million aggregate principal amount of term loans (the New Term Loans) and a $75.0 million revolving credit facility (the New Revolving Credit Facility, and together with the New Term Loans, the New Credit Facilities). The New Term Loans were fully funded in September 2018 and the Company received cash proceeds of $73.6 million , net of arrangement fees of $1.1 million and upfront fees of $0.3 million . The Company has made no draw on the New Revolving Credit Facility as of December 31, 2018 . The New Term Loans amortize at a rate of 7.5% per annum for the first two years of the New Credit Facilities, 10.0% per annum for the third and fourth years and the first three quarters of the fifth year of the New Credit Facilities, with the balance due at maturity. The New Term Loans and the New Revolving Credit Facility are each expected to mature on the fifth anniversary of the effectiveness of the New Credit Facilities. The New Revolving Credit Facility has a commitment fee, which currently accrues at 0.40% on the daily unused amount of the aggregate revolving commitments of the lenders. All outstanding amounts under the New Credit Facilities bear interest, at the Company's options, at (i) a reserve adjusted LIBO Rate plus a margin between 2.25% and 2.75% or (ii) a base rate plus a margin between 1.25% and 1.75% , in each case determined on a quarterly basis based on the Company's consolidated total leverage ratio. The current annual interest rate for the New Term Loans is 4.88% as of December 31, 2018. The New Credit Facilities contain customary conditions to borrowing, events of default, and covenants. Financial covenants include maintaining a (i) maximum consolidated total leverage ratio; (ii) minimum consolidated interest coverage ratio; and (iii) minimum liquidity ratio. The Company was in compliance with all debt covenants as of December 31, 2018. As of December 31, 2018 , the contractual principal payments for the New Term Loans for the next five years are as follows (in thousands): 2019 $ 5,625 2020 6,563 2021 7,500 2022 7,500 2023 46,406 Total $ 73,594

Redeemable Convertible Preferre

Redeemable Convertible Preferred Stock Warrants	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Redeemable Convertible Preferred Stock Warrants	Redeemable Convertible Preferred Stock Warrants In connection with the First WTI Loan Facility and the Second WTI Loan Facility discussed in Note 10, the Company issued warrants to WTI to purchase shares of our Series G redeemable convertible preferred stock. The preferred stock warrants became exercisable into 411,991 shares of Series G redeemable convertible preferred stock when the First WTI Loan Facility was executed in June 2017. In September 2017, the redeemable convertible preferred stock warrants became exercisable into an additional 205,995 shares of Series G redeemable convertible preferred stock when the Company borrowed $30.0 million under the First WTI Loan Facility. In March 2018, as a result of the Company borrowing the remaining $30.0 million under the First WTI Loan Facility, the Series G redeemable convertible preferred stock warrants became exercisable into an additional 205,995 shares of Series G redeemable convertible preferred stock. In May 2018, the Company issued additional warrants which were exercisable into 109,288 shares of Series G redeemable convertible preferred stock. The exercise price of all of the Series G redeemable convertible preferred stock warrants was $16.3836 per share and the redeemable convertible preferred stock warrants had an expiration date ten years from the date of issuance. In September 2018, in connection with our IPO, the redeemable convertible preferred stock warrants were automatically exercised into shares of Class B common stock and the related liability was reclassified to additional paid-in capital. Refer to Note 2 for discussion of the significant inputs used to determine the fair value of the redeemable convertible preferred stock warrants. The following table represents the changes in the liability relating to the redeemable convertible preferred stock warrants (in thousands): Balance as of January 1, 2017 $ — Issuances 5,071 Change in fair value 2,200 Balance as of December 31, 2017 7,271 Issuances 4,603 Change in fair value 9,591 Automatic conversion in connection with initial public offering (21,465 ) Balance as of December 31, 2018 $ —

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Redeemable Convertible Preferred Stock Immediately prior to the closing of the Company's IPO, 41,628,207 shares of outstanding redeemable convertible preferred stock converted into 42,188,624 shares of Class B common stock (including additional shares issuable upon conversion of our Series G redeemable convertible preferred stock based on the IPO price of $23.00 per share). Further, outstanding warrants to purchase 933,269 shares of our Series G redeemable convertible preferred stock automatically exercised into 997,193 shares of Class B common stock based on the IPO price of $23.00 per share. Common Stock 2004 and 2010 Stock Option Plans In 2004, the board of directors and shareholders of the Company authorized and ratified the 2004 Stock Plan (2004 Plan), as amended. The 2004 Plan allows for the issuance of incentive stock options (ISOs), non-statutory stock options (NSOs) and stock purchase rights. The 2004 Plan states the maximum aggregate number of shares that may be subject to options or stock purchase rights and sold under the plan is 6,000,000 shares. In 2010, the board of directors and shareholders of the Company authorized and ratified the 2010 Stock Plan (2010 Plan), as amended. The 2010 Plan allows for the issuance of ISOs, NSOs and stock purchase rights. The 2010 Plan states the maximum aggregate number of shares that may be subject to options or stock purchase rights and sold under the plan is 30,663,761 shares. 2018 Stock Option and Incentive plan In August 2018, the 2018 Stock Option and Incentive Plan (2018 Plan) was adopted by the board of directors and approved by the shareholders and became effective in connection with the IPO. The 2018 Plan replaces the 2010 Plan as the board of directors has determined not to make additional awards under the 2010 Plan. The 2010 Plan will continue to govern outstanding equity awards granted thereunder. We initially reserved 7.7 million shares of Class A common stock for the issuance of awards under the 2018 Plan and 7.2 million shares of Class A common stock are reserved as of December 31, 2018. Under the 2018 Plan, the Company’s board of directors has authorized two classes of common stock, Class A and Class B. Holders of Class A common stock are entitled to one vote per share and holders of Class B common stock are entitled to ten votes per share. The Company’s common stock has no preferences or privileges and is not redeemable. Holders of Class A and Class B common stock are entitled to dividends, if and when declared, by the Company’s board of directors. The 2018 Plan allows for the granting of options, stock appreciation rights, restricted stock and RSUs, unrestricted stock awards, dividend equivalent rights and cash-based awards. As of December 31, 2018 , there were 22,012,597 options issued and outstanding and 10,867,313 shares available for issuance under the 2004 Plan, 2010 Plan and 2018 Plan (collectively, the Plans). Beginning January 1, 2019, and each January 1 thereafter, the number of shares of stock reserved and available for issuance under the 2018 Plan will cumulatively increase by five percent of the number of shares of Class A and Class B common stock outstanding on the immediately preceding December 31, or a lesser number of shares as approved by the board of directors. Stock options granted typically vest over a four -year period from the date of grant. Options awarded under the Plans may be granted at an exercise price per share not less than the fair value at the date of grant and are exercisable up to ten years. Stock option activity under the Plans is as follows: Outstanding Weighted- Weighted- Aggregate Balance as of December 31, 2016 13,669,181 $ 4.60 5.9 $ 26,710 Granted 7,332,168 7.06 Exercised (1,376,872 ) 1.24 7,600 Cancelled (923,210 ) 6.14 Balance as of December 31, 2017 18,701,267 5.73 7.3 29,728 Granted 6,824,057 12.68 Exercised (1,727,899 ) 4.69 16,816 Cancelled (1,784,828 ) 7.19 Balance as of December 31, 2018 22,012,597 7.85 7.1 439,382 Vested and exercisable as of December 31, 2017 10,731,138 4.72 5.5 28,112 Vested and expected to vest as of December 31, 2017 17,781,271 5.65 6.8 29,978 Vested and exercisable as of December 31, 2018 12,462,693 5.75 5.6 274,883 Vested and expected to vest as of December 31, 2018 20,926,797 7.69 7.0 421,047 2018 Employee Stock Purchase plan In August 2018, the board of directors adopted, and stockholders approved, the 2018 Employee Stock Purchase Plan (“ESPP”). A total of 1,534,500 shares of the Company’s Class A common stock have been initially authorized for issuance under the 2018 ESPP. Subject to any plan limitations, the 2018 ESPP allows eligible employees to contribute, through payroll deductions, up to 15% of their earnings for the purchase of the Company’s Class A common stock at a discounted price per share. Except for the initial offering period, the ESPP provides for separate six-month offering periods. The initial offering period will run from September 20, 2018 through May 31, 2019. Unless otherwise determined by the board of directors, the Company’s Class A common stock will be purchased for the accounts of employees participating in the ESPP at a price per share that is the lesser of (1) 85% of the fair market value of the Company’s Class A common stock on the first trading day of the offering period, which for the initial offering period is the price at which shares of the Company’s Class A common stock were first sold to the public, or (2) 85% of the fair market value of the Company’s Class A common stock on the last trading day of the offering period. During the year ended December 31, 2018, no shares of Class A common stock were purchased under the 2018 ESPP. The total expense related to the 2018 ESPP for year ended December 31, 2018 was $0.4 million . Beginning January 1, 2019 and each January 1 thereafter, the number of shares of Class A common stock reserved and available for issuance under the ESPP will be cumulatively increased by the lesser of (1) 1,534,500 shares of Class A common stock, (2) one percent of the number of shares of Class B common stock of the Company outstanding on the immediately preceding December 31 or (3) a lesser number of shares of Class A common stock as determined by the board of directors. Common Stock Subject to Repurchase The 2010 Plan and the Company’s stock option agreement allow for the early exercise of stock options for certain individuals, as determined by the board of directors. Common stock purchased pursuant to an early exercise of stock options is not deemed to be outstanding for accounting purposes until those shares vest. The consideration received for an exercise of an option is considered to be a deposit of the exercise price and the related dollar amount is recorded as a liability. Upon termination of service, the Company may, at their discretion, repurchase unvested shares acquired through early exercise of stock options at a price equal to the price per share paid upon the exercise of such options. The Company includes unvested shares subject to repurchase in the number of shares of common stock outstanding. At December 31, 2018 and December 31, 2017 , outstanding common stock included 55,537 and 103,133 shares, respectively, subject to repurchase related to stock options early exercised and unvested. The Company had a liability of $0.4 million and $0.8 million as of December 31, 2018 and 2017, respectively, related to early exercises of stock options. The liability is reclassified into stockholders’ equity as the awards vest. Stock-based Compensation Expense All stock-based awards to employees and members of the Company’s board of directors are measured based on the grant date fair value of the awards and recognized in the consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (the vesting period of the award). The Company estimates the fair value of stock options granted using the Black-Scholes option pricing model and records stock-based compensation expense for service-based equity awards using the straight-line attribution method. The following range of assumptions were used to estimate the fair value of stock options granted to employees: Year Ended December 31, 2018 2017 2016 Expected dividend yield — — — Expected volatility 43.5 - 48.2% 40.7 - 57.1% 57.6 - 62.8% Risk-free interest rate 2.96 - 3.09% 1.92 - 2.1% 1.14 - 1.93% Expected term (years) 5.28 - 6.08 5.02 - 6.08 6.02 - 6.08 The weighted-average fair value of stock options granted was $8.16 , $ 3.25 and $4.06 for the year ended December 31, 2018 , 2017 and 2016 , respectively. As of December 31, 2018 and 2017 , the total unrecognized stock-based compensation related to unvested options outstanding was $51.3 million and $23.7 million , respectively, to be recognized over a weighted-average period of 2.73 years and 2.68 years , respectively. The following range of assumptions were used to estimate the purchase rights granted under the 2018 ESPP on the first day of the offering period: Year Ended December 31, 2018 Expected dividend yield — Expected volatility 48.52% Risk-free interest rate 2.37% Expected term (years) 0.69 Restricted Stock Units In 2011, the Company granted 802,900 shares of restricted stock units (RSUs) to one of its executive officers. The RSUs would fully vest upon the occurrence of a qualifying event, defined as a change of control or initial public offering of the Company under the Securities Act of 1933, as amended, within six years of the grant date. There is no time or service condition. On November 3, 2017, the Restricted Stock Unit Agreement was amended to modify the expiration date of November 9, 2017 to December 31, 2017. These RSUs expired on December 31, 2017 and on January 1, 2018, the Company granted RSUs with identical terms and conditions to the same executive officer with an expiration date of December 31, 2024. The Company completed its IPO in September 2018 and satisfied the performance condition. The Company recognized $6.9 million of stock-based compensation expense, based on the fair value of the award when it was granted, which is included in general and administrative expenses for the year ended December 31, 2018. In May 2018, the Company granted a total of 230,000 shares of RSUs. These RSUs have both a service and performance condition. The service condition is satisfied by continued employment with the Company and these shares will lapse over a period of four years. The performance condition is the occurrence of a qualifying event, defined as a change of control or initial public offering of the Company under the Securities Act of 1933, as amended, within 10 years of the grant date. The performance condition has been satisfied due to the IPO taking place in September 2018 and the Company began recognizing expense for these awards. As of December 31, 2018 , the Company has recognized $ 0.4 million of stock-based compensation expense related to these RSUs. Restricted stock activity for the year ended December 31, 2018 is presented as follows: Outstanding RSUs and RSAs Weighted-average grant date fair value per share Weighted- Aggregate Balance at December 31, 2017 802,900 $ 8.65 Vested (805,893 ) Awarded 686,072 16.09 Cancelled (8,799 ) 31.79 Balance at December 31, 2018 674,280 24.75 1.9 $ 18,752 Vested and expected to vest as of December 31, 2018 532,623 24.80 1.7 14,812 The Company recognized $8.7 million of stock-based compensation expense related to RSUs during the year ended December 31, 2018, and as of that date, the total unrecognized stock-based compensation related to RSUs outstanding was $12.3 million and will be recognized over a weighted-average period of 3.56 years . Sales of the Company’s Stock In May 2018, employees and former employees of the Company sold an aggregate of 1.3 million shares of the Company’s common stock to entities affiliated with an existing investor at a purchase price of $13.12 per share, for an aggregate purchase price of $17.2 million . The purchase price was in excess of the fair value of such shares. As a result, during the year ended December 31, 2018 , the Company recorded the excess of the purchase price above fair value of $2.2 million as compensation expense.

Net Loss Per Share

Net Loss Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share The Company calculates basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. The Company considered all series of redeemable convertible preferred stock to have been participating securities as the holders were entitled to receive non-cumulative dividends on a pari passu basis in the event that a dividend was paid on common stock. Under the two-class method, the net loss attributable to common stockholders is not allocated to the redeemable convertible preferred stock as the holders of redeemable convertible preferred stock do not have a contractual obligation to share in losses. Under the two-class method, basic net loss per share attributable to common stockholders is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share attributable to common stockholders is computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period. For purposes of this calculation, redeemable convertible preferred stock, stock options to purchase common stock, early exercised stock options, and warrants to purchase redeemable convertible preferred stock and common stock are considered common shares equivalents, but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is anti-dilutive. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive. The rights, including the liquidation and dividend rights, of the holders of Class A and Class B common stock are identical, except with respect to voting. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share attributed to common stockholders will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): Year Ended December 31, 2018 2017 2016 Net loss $ (64,078 ) $ (38,547 ) $ (40,392 ) Weighted-average shares used in computing net loss per share, basic and diluted 37,540 19,500 16,291 Net loss per share, basic and diluted $ (1.71 ) $ (1.98 ) $ (2.48 ) The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect (in thousands): December 31, 2018 2017 2016 Redeemable convertible preferred stock — 41,628 33,446 Stock-options to purchase common stock 22,013 18,701 13,709 Redeemable convertible preferred stock warrants — 618 — Restricted stock units 686 803 803 Early exercised options 56 115 151 Total 22,755 61,865 48,109

Income Taxes Income Taxes

Income Taxes Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Loss before the provision for (benefit from) income taxes consisted of the following for the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Domestic $ (50,133 ) $ (31,681 ) $ (37,901 ) International (12,795 ) (6,879 ) (2,360 ) Total $ (62,928 ) $ (38,560 ) $ (40,261 ) The components of the Company's income tax provision (benefit) were as follows for the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Current tax expense Federal $ 234 $ — $ — State (10 ) 109 19 Foreign 823 278 170 Total current tax expense 1,047 387 189 Deferred tax expense (benefit) Federal 317 99 15 State 153 55 1 Foreign (367 ) (554 ) (74 ) Total deferred tax expense (benefit) 103 (400 ) (58 ) Total income tax provision (benefit) $ 1,150 $ (13 ) $ 131 The reconciliation of the Federal statutory income tax provision to the Company’s effective income tax provision is as follows for the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Federal tax benefit at statutory rate $ (13,298 ) $ (13,147 ) $ (13,733 ) State tax (10 ) 2,009 20 Foreign rate differential 1,315 2,513 1,125 Non-deductible permanent items 4,129 1,142 693 Stock-based compensation (1,178 ) 1,950 2,184 Tax credits (922 ) (1,702 ) — Change in valuation allowance 11,114 (14,653 ) 9,842 Tax Act-revaluation of deferred taxes — 21,875 — Total $ 1,150 $ (13 ) $ 131 On December 22, 2017, the Tax Act was enacted into law in the United States. The Tax Act significantly revises U.S. corporate income tax law by, among other things, lowering U.S. corporate income tax rates from 35% to 21%, implementing a territorial tax system, and imposing a one-time transition tax on deemed repatriated earnings of non-U.S. subsidiaries. The U.S. tax law changes will not have a significant impact on the Company’s tax expense in the short-term due to the Company’s large net operating loss and tax credit carryovers and associated valuation allowance. The Tax Act’s new international rules, including Global Intangible Low-Taxed Income (GILTI), Foreign Derived Intangible Income (FDII), and Base Erosion Anti-Avoidance Tax (BEAT) are effective beginning in 2018. For 2018, the Company has included the effects of the Tax Act in its financial statements and concluded the impact was not material. Regarding the new GILTI tax rules, the Company is required to make an accounting policy election to either treat taxes due on future GILTI inclusions in U.S. taxable income as a current period expense when incurred or reflect such portion of the future GILTI inclusions in U.S. taxable income that relate to existing basis differences in the Company's current measurement of deferred taxes. The Company has made a policy election to treat GILTI taxes as a current period expense. Pursuant to SEC Staff Accounting Bulletin (SAB) 118 (regarding the application of ASC 740, Income Taxes (ASC 740) associated with the enactment of the Tax Act), the Company believes its accounting under ASC 740 for the provisions of the Tax Act is now complete. The Company’s deferred tax assets and liabilities as of the dates indicated were as follows (in thousands): Year Ended December 31, 2018 2017 Deferred tax assets: Net operating losses $ 50,154 $ 39,970 Accrual and reserves 7,725 7,845 Tax credit carry-forward 8,503 6,683 Stock-based compensation 5,944 3,642 Depreciation and amortization 4,735 2,593 Total deferred tax assets 77,061 60,733 Valuation allowance (75,436 ) (58,748 ) Net deferred tax assets 1,625 1,985 Deferred tax liabilities: Depreciation and amortization (3,665 ) (3,925 ) Net deferred taxes $ (2,040 ) $ (1,940 ) The Company regularly assesses the realizability of its deferred tax assets and establishes a valuation allowance if it is more-likely-than-not that some portion of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Due to the Company’s history of net operating losses, the Company believes it is more likely than not that the vast majority of its federal, state, and certain foreign deferred tax assets will not be realized as of December 31, 2018 and December 31, 2017. The total valuation allowance recorded as of December 31, 2018, 2017 and 2016 was $75.4 million , $58.7 million and $59.8 million , respectively. The activity in the Company's deferred tax asset valuation allowance for the periods indicated was as follows (in thousands): Year Ended December 31, 2018 2017 2016 Balance, beginning of period $ 58,748 $ 59,806 $ 48,390 Charged to costs and expenses 13,243 — 11,416 Charged to other accounts 3,445 — — Deductions — (1,058 ) — Balance, end of period $ 75,436 $ 58,748 $ 59,806 As of December 31, 2018 and 2017, the Company has net operating loss carryforwards for federal income tax purposes of $140.6 million and $135.9 million , respectively, available to reduce future taxable income. The federal net operating loss carryforwards will begin to expire, if not utilized, in 2025. In addition, the Company has $49.6 million and $46.0 million of net operating loss carryforwards available to reduce future taxable income for California state income tax purposes for year ended December 31, 2018 and 2017, respectively. The state net operating loss carryforwards will begin to expire, if not utilized, in 2023. The federal and state net operating loss carryforwards are subject to various annual limitations under Section 382 of the Internal Revenue Code and similar state provisions. As of December 31, 2018, the Company had Federal and California Research and Development Credits of $7.8 million and $6.6 million , respectively. The Federal Research and Development Credits will begin to expire, if not utilized, in 2031. The California Research and Development Credits do not expire as it has an indefinite life. As of December 31, 2018 and 2017, the Company had California EZ Hiring Tax Credits of $2.2 million . The California Hiring Tax Credits will begin to expire, if not utilized, in 2019. As of December 31, 2018, 2017 and 2016, the Company had unrecognized tax benefits of $7.2 million , $5.5 million and zero , respectively, which would not affect the effective tax rate because of the Company's valuation allowance position. A reconciliation of the unrecognized tax benefit for the periods indicated is as follows (in thousands): Balance as of December 31, 2016 $ — Gross amount of increases in unrecognized tax benefits for tax positions taken in current year 1,526 Gross amount of increases in unrecognized tax benefits for tax positions taken in prior period 3,970 Balance as of December 31, 2017 5,496 Gross amount of increases in unrecognized tax benefits for tax positions taken in current year 1,744 Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior period — Balance as of December 31, 2018 $ 7,240 The Company classifies uncertain tax positions as non-current income tax liabilities unless expected to be paid within one year or otherwise directly related to an existing deferred tax asset, in which case the uncertain tax position is recorded net of the asset on the consolidated balance sheet. As of December 31, 2018, $7.2 million of the Company’s gross unrecognized tax benefits were recorded as a reduction of the related deferred tax assets. The Company’s policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of its provision for income taxes. The amount of interest and penalties accrued as of December 31, 2017 and 2018 was zero. The Company does not anticipate that its total unrecognized tax benefits will significantly change due to settlement of examination or the expiration of statute of limitations during the next 12 months. The Company files income tax returns in the U.S. federal jurisdiction as well as many U.S. states and certain foreign jurisdictions. Material jurisdictions where the Company is subject to potential examination include the United States, United Kingdom and Netherlands. The Company is subject to examination in these jurisdictions for all years since 2006. Fiscal years outside the normal statute of limitation remain open to audit due to tax attributes generated in the early years which have been carried forward and may be audited in subsequent years when utilized. The Company is not currently under examination for income taxes in any jurisdiction.

Geographic Information

Geographic Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Geographic Information	Geographic Information The following table presents the Company's total net revenue by geography based on the currency of the underlying transaction (in thousands): Year Ended December 31, 2018 2017 2016 United States $ 211,705 $ 141,118 $ 97,454 International 79,906 60,479 36,045 Total net revenue $ 291,611 $ 201,597 $ 133,499 No individual country included in the International line above represents more than 10% of the total consolidated net revenue for any of the periods presented. Substantially all of the Company's long-lived assets are located in the United States.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated
Use of Estimates	In order to conform with U.S. GAAP, the Company is required to make certain estimates, judgments and assumptions when preparing its consolidated financial statements. These estimates, judgments and assumptions affect the reported assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reported periods. These estimates include, but are not limited to, the recoverability of creator signing fees and creator advances, the capitalization and estimated useful life of internal-use software, certain assumptions used in the valuation of equity awards, assumptions used in determining the fair value of the redeemable convertible preferred stock warrant liability prior to the IPO, fair value of the term loan derivative liability, assumptions used in determining the fair value of business combinations, the allowance for doubtful accounts, indirect tax reserves and contra-revenue amounts related to fraudulent events, customer disputed transactions and refunds. The Company evaluates these estimates on an ongoing basis. Actual results could differ from those estimates and such differences could be material to the Company’s consolidated financial statements.
Comprehensive Loss	For all periods presented, comprehensive loss equaled net loss. Therefore, the consolidated statements of comprehensive loss have been omitted from the consolidated financial statements.
Segment Information	The Company’s Chief Executive Officer (CEO) and Chief Financial Officer (CFO) make up the chief operating decision maker function. This function reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating the Company’s financial performance. Additionally, there are no segment managers or other individuals that are held accountable for results below the consolidated level. Accordingly, the Company has determined that it operates as a single reportable and operating segment.
Revenue Recognition and Cost of Revenue	Revenue primarily consists of service fees and payment-processing fees (Eventbrite fees) recognized at the time a ticket for an event is sold and processed. The Company’s customers are event creators who are selling tickets for events using the Company’s platform. The creator has the choice of whether to use Eventbrite Payment Processing (EPP) or to use a third-party payment processor, referred to as Facilitated Payment Processing (FPP). Under the EPP option, the Company is the merchant of record and is responsible for processing the transaction and collecting the face value of the ticket and all associated fees at the time the ticket is sold. The Company is also responsible for remitting these amounts collected, less the Company’s fees, to the creators. Under the FPP option, Eventbrite is not responsible for processing the transaction or collecting the face value of the ticket and associated fees. In this case, the Company invoices the creator for all of the Company’s fees. The determination of whether the Company acts as a principal or an agent in a transaction is based on an evaluation of whether the Company has the substantial risks and rewards of ownership under the terms of an arrangement. The Company determined the creator is the primary obligor in a ticketing transaction as the creator is responsible for providing the event for which a ticket is sold and is the party responsible for providing a refund if the event is canceled. The Company’s service provides a platform for the creator and event attendee to transact and to facilitate payment processing of that transaction. The amount that the Company earns for this service is fixed. For the payment processing service, the Company determined that it is the primary obligor because it is acting as the principal in providing the service and has latitude in setting the price of the service. Based on management’s assessment, the Company records revenue on a net basis related to its ticketing service and on a gross basis related to its payment processing service. The Company’s revenue is derived from its service fees and payment processing fees and is recognized as tickets for an event are sold and processed since the Company believes that is when all the following conditions are met: • There is persuasive evidence of an arrangement; • The service has been provided to the creator; • The collection of the fees is reasonably assured; and • The amount of fees to be paid is fixed or determinable. Revenue is presented net of indirect taxes, value-added taxes, creator royalties and reserves for customer refunds, payment chargebacks and estimated uncollectible amounts. If an event is cancelled by a creator, then any obligations to provide refunds to event attendees are the responsibility of that creator. If a creator is unwilling or unable to fulfill their refund obligations, the Company may, at its discretion, provide attendee refunds. Revenue is also presented net of the amortization of creator signing fees. The benefit the Company receives by securing exclusive ticketing and payment processing rights with certain creators from these fees is inseparable from the customer relationship with the creator and accordingly these fees are recorded as a reduction of revenue. Cost of revenue consists primarily of payment processing fees, platform and website hosting fees and operational costs, amortization of acquired developed technology, amortization of capitalized internal-use software development costs, field operations costs and allocated customer support costs.
Cash, Cash Equivalents and Restricted Cash	Cash and cash equivalents includes bank deposits and money market funds held with financial institutions. Cash and cash equivalents balances include the face value of tickets sold on behalf of creators and their share of service charges, which amounts are to be remitted to the creators. Such balances were $217.4 million and $179.5 million as of December 31, 2018 and 2017 , respectively. Although creator cash is legally unrestricted, the Company does not utilize creator cash for its own financing or investing activities as the amounts are payable to creators on a regular basis. These amounts due to creators are included in accounts payable, creators on the consolidated balance sheets. The Company also considers all highly liquid investments, including money market funds with an original maturity of three months or less at the date of purchase, to be cash equivalents. The Company has issued letters of credit under lease agreements which have been collateralized with cash. This cash is classified as noncurrent restricted cash on the consolidated balance sheets based on the term of the underlying lease.
Funds Receivable	Funds receivable represents cash-in-transit from third-party payment processors that is received by the Company within approximately five business days from the date of the underlying ticketing transaction. The funds receivable balances include the face value of tickets sold on behalf of creators and their share of service charges, which amounts are to be remitted to the creators.
Accounts Receivable, Net	Accounts receivable, net is comprised of invoiced amounts to creators who use a third-party facilitated payment processor (FPP). For customer accounts receivable balances related to FPP, the Company records accounts receivable at the invoiced amount, net of a reserve to provide for potentially uncollectible amounts. In evaluating the Company’s ability to collect outstanding receivable balances, the Company considers various factors including the age of the balance, the creditworthiness of the customer and the customer’s current financial condition. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified.
Property, Plant and Equipment, Net	Property, plant and equipment, including assets acquired through capital leases, are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of assets. Maintenance and repair costs are charged to expense as incurred. The estimated useful lives of the Company’s property, plant and equipment are as follows: Estimated Useful Life Building and improvements 30 years Furniture and fixtures 3-5 years Computers and computer equipment 1-2 years Computer software 2-3 years Capitalized internal-use software development costs 2 years Leasehold improvements Shorter of estimated useful life or remaining lease term
Fair Value Measurements	The Company measures its financial assets and liabilities at fair value at each reporting date using a fair value hierarchy that requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 – Other inputs that are directly or indirectly observable in the marketplace. Level 3 – Unobservable inputs that are supported by little or no market activity. The Company’s money market funds, funds receivable, accounts receivable, accounts payable, other current liabilities and debt approximate their fair value. All of these financial assets and liabilities are Level 1, except for debt, which is Level 2. There are no other Level 1 or Level 2 assets or liabilities recorded at December 31, 2018 and 2017 . The Company measures the redeemable convertible preferred stock warrant liability (as discussed in Note 11) and term loan derivative asset (as discussed in Note 10) at fair value on a recurring basis and determined these are Level 3 financial assets and liabilities, respectively, in the fair value hierarchy. The fair value of the redeemable convertible preferred stock warrants was estimated using a hybrid between a probability-weighted expected return method (PWERM) and option pricing model (OPM), estimating the probability weighted value across multiple scenarios, while using an OPM to estimate the allocation of value within one or more of these scenarios. Under a PWERM, the value of the Company’s various equity securities was estimated based upon an analysis of future values for the Company assuming various future outcomes, including two IPO scenarios and two scenarios contemplating the continued operation of the Company as a privately held enterprise. Guideline public company multiples were used to value the Company under the IPO scenarios. The discounted cash flow method was used to value the Company under the staying private scenarios. Share value for each class of security was based upon the probability-weighted present value of expected future investment returns, considering each of these possible future outcomes, as well as the rights of each share class. The significant unobservable inputs into the valuation model used to estimate the fair value of the redeemable convertible preferred stock warrants include the timing of potential events (IPO) and their probability of occurring, the selection of guideline public company multiples, a discount for the lack of marketability of the preferred and common stock, the projected future cash flows, and the discount rate used to calculate the present-value of the estimated equity value allocated to each share class. The significant unobservable inputs into the valuation model used to estimate the fair value of the term loan derivative asset include the timing of potential events (primarily the IPO), probability of exercise and the discount rate used to calculate the present value of discounted cash flows. Generally, changes in the fair value of the underlying redeemable convertible preferred stock would result in a directionally similar impact to the fair value of the redeemable convertible preferred stock warrant liability.
Leases	The Company leases office space and certain computer equipment under noncancelable lease agreements which are accounted for as operating leases. Rent expense is recorded on a straight-line basis over the lease term. If a lease provides for fixed escalations of the minimum rental payments, the difference between the straight-line rent charged to expense and the amount payable under the lease is recognized as deferred rent. The Company considers the nature of renovations and the Company’s involvement during the construction period for leased office space to determine if it should be considered the owner of the construction project during the construction period. If the Company determines that it is the owner of the construction project, it is required to capitalize the fair value of the building as well as the construction costs incurred on its consolidated balance sheet along with a corresponding liability (build-to-suit accounting). Upon occupancy for build-to-suit leases, the Company assesses whether the circumstances qualify for sales recognition under the sale-leaseback accounting guidance. If the lease meets the sale-leaseback criteria, the Company will remove the asset and related financial obligation from the consolidated balance sheet and treat the building lease as an operating lease. If upon completion of construction, the project does not meet the sale-leaseback criteria, the leased property will continue to be treated as a build-to-suit lease asset and financing obligation for financial reporting purposes.
Internal-Use Software Development Costs	The Company capitalizes certain costs associated with website and application development and software developed or obtained for internal use. Costs incurred in the preliminary stages of development are expensed as incurred. Once software has reached the end of the preliminary project stage, internal and external costs, if direct and incremental, are capitalized until the software is substantially complete and ready for its intended use, including stock-based compensation and other employee benefit costs. Capitalization ceases upon completion of all substantial testing. The Company also capitalizes costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Capitalized costs are included in property and equipment, net in the consolidated balance sheet. Capitalized internal-use software and website development costs are amortized on a straight-line basis over their estimated useful life, which is two years. Amortization expense is recorded in cost of revenue within the consolidated statements of operations. Maintenance and training costs are charged to expense as incurred and included in operating expenses.
Business Combinations	The Company allocates the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Significant estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired users, acquired technology, trade names from a market participant perspective, useful lives and discount rates. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, which is one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings.
Goodwill	Goodwill Goodwill represents the excess of the aggregate fair value of the consideration transferred in a business combination over the fair value of the assets acquired, net of liabilities assumed. Goodwill is not amortized but the Company evaluates goodwill impairment of its single reporting unit annually on the first day of the fourth quarter, or more frequently if events or changes in circumstances indicate the goodwill may be impaired. Events or changes in circumstances which could trigger an impairment review include significant changes in the manner of the Company’s use of the acquired assets or the strategy for the Company’s overall business, significant negative industry or economic trends, significant underperformance relative to historical or projected future results of operations, a significant adverse change in the business climate, an adverse action or assessment by a regulator, unanticipated competition or a loss of key personnel. The Company has the option to 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 the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if an entity concludes otherwise, then it is required to perform the first of a two-step impairment test. The first step involves comparing the estimated fair value of the reporting unit with its respective 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. If, however, the fair value of the reporting unit is less than book value, then a second step is required that compares the carrying amount of the goodwill with its implied fair value. The estimate of implied fair value of goodwill may require valuations of certain internally-generated and unrecognized intangible and tangible net assets. If the carrying amount of goodwill exceeds the implied fair value of the goodwill, an impairment loss is recognized in an amount equal to the excess.
Acquired Intangible Assets, Net	Acquired Intangible Assets, Net Acquired intangible assets, net consists of identifiable intangible assets such as developed technology, customer relationships, and trade names resulting from the Company’s acquisitions. Acquired intangible assets are recorded at fair value on the date of acquisition and amortized over their estimated economic lives following the pattern in which the economic benefits of the assets will be consumed, determined to be straight-line. Acquired intangible assets are presented net of accumulated amortization in the consolidated balance sheet. The Company evaluates the recoverability of its intangible assets for potential impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of these assets is measured by a comparison of the carrying amounts to the future undiscounted cash flows the assets are expected to generate. If such review indicates that the carrying amount of intangible assets is not recoverable, the carrying amount of such assets is reduced to the fair value.
Creator Signing Fees, Net and Deferred Offering Costs	Deferred offering costs, which consist of direct incremental legal, consulting, banking and accounting fees relating to anticipated equity offerings, are capitalized and offset against proceeds upon the consummation of the offerings within stockholders’ equity. Creator signing fees, net represent contractual amounts paid to creators pursuant to event ticketing and payment processing agreements. Creator signing fees are additional incentives paid by the Company to secure exclusive ticketing and payment processing rights with certain creators. These payments are amortized over the life of the contract to which they relate on a straight-line basis. Creator signing fees are presented net of reserves and allowances for potentially unrecoverable amounts on the consolidated balance sheets. Amortization of creator signing fees is recorded as a reduction of revenue in the consolidated statements of operations.
Creator Advances, Net	Creator advances, net represent contractual amounts paid to creators pursuant to event ticketing and payment processing agreements. Creator advances provide the creator with funds in advance of the event and are subsequently recovered by withholding amounts due to the Company from the sale of tickets until the creator advance has been fully recovered. Creator advances are presented net of reserves and allowances for potentially unrecoverable amounts on the consolidated balance sheets.
Impairment of Long-Lived Assets	The carrying amounts of long-lived assets, including property and equipment, capitalized internal-use software, creator signing fees, creator advances and acquisition-related intangible assets, are periodically reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable or that the useful life is shorter than originally estimated. Recoverability of assets to be held and used is measured by comparing the carrying amount of an asset to future undiscounted net cash flows the asset is expected to generate over its remaining life. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. If the useful life is shorter than originally estimated, the Company amortizes the remaining carrying value over the revised shorter useful life.
Accounts Payable, Creators	Accounts payable, creators consists of unremitted ticket sale proceeds, net of Eventbrite service fees and applicable taxes. Amounts are remitted to creators within five business days subsequent to the completion of the related event. In certain situations, at the request of the creator, the Company may remit ticket sale proceeds in advance of the related event.
Advertising	Advertising costs are charged to expense as incurred. The costs of developing advertising creative and trade show expenses are initially deferred and charged to expense in the period in which the advertising is displayed or the period the trade show occurs.
Stock-Based Compensation Expense	Stock-based compensation expense to employees is measured based on the grant-date fair value of the awards and recognized in the consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (the vesting period of the award). The Company estimates the fair value of stock options granted using the Black-Scholes option pricing model. The Company measures the fair value of RSUs based on the fair value of the underlying shares on the date of grant. Compensation expense is recognized over the vesting period of the applicable award using the straight-line method. The Company estimates forfeitures in order to calculate the stock-based compensation expense. Compensation expense for nonemployee stock options is calculated using the Black-Scholes option pricing model and is recorded as the options vest. Options subject to vesting are revalued periodically over the service period, which is the same as the vesting period.
Income Taxes	The Company records income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the consolidated financial statements or tax returns. Deferred tax assets and liabilities are measured using enacted tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized. The Company recognizes tax benefits from uncertain tax positions 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. Although the Company believes it has adequately provided for its uncertain tax positions, the Company can provide no assurance that the final tax outcome of these matters will not be materially different. The Company adjusts these allowances when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on the Company’s consolidated financial statements.
Foreign Currency Remeasurement	The functional currency of the Company’s international subsidiaries is the U.S. dollar. Accordingly, monetary balance sheet accounts are remeasured using exchange rates in effect at the balance sheet dates and non-monetary items are remeasured at historical exchange rates. Revenue and expenses are remeasured at the average exchange rates for the period. Foreign currency remeasurement and transaction gains and losses are included in other income (expense), net in the consolidated statements of operations.
Concentrations of Risk	Financial instruments potentially exposing the Company to concentrations of credit risk consist primarily of cash, funds receivable, accounts receivable, payments to creators and creator advance payouts. The Company holds its cash with high-credit-quality financial institutions; however, the Company maintains balances in excess of the FDIC insurance limits. The Company does not require their customers to provide collateral to support accounts receivable and maintains an allowance for accounts receivable balances that are doubtful of collection.
Redeemable Convertible Preferred Stock Warrants	Freestanding warrants to purchase shares of redeemable convertible preferred stock are classified as liabilities on the consolidated balance sheets at their estimated fair value because the underlying shares of redeemable convertible preferred stock are contingently redeemable and, therefore, may obligate the Company to transfer assets at some point in the future. Such warrants are recorded at fair value upon issuance and remeasured to fair value at each reporting period through the consolidated statements of operations. The Company adjusts the redeemable convertible preferred stock warrant liability for changes in estimated fair value until the earlier of the exercise or expiration or the completion of a sale of the Company or an IPO. Upon the completion of the Company's IPO in September 2018, all of the Company's outstanding warrants to purchase shares of redeemable convertible preferred stock were automatically exercised into shares of the Company’s Class B common stock.
Net Loss Per Share	The Company follows the two-class method when computing net loss per common share when shares are issued that meet the definition of participating securities. The two-class method determines net income (loss) per common share for each class of common stock and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two-class method requires income available to common stockholders for the period to be allocated between common stock and participating securities based upon their respective rights to receive dividends as if all income for the period had been distributed. The Company’s redeemable convertible preferred stock contractually entitles the holders of such shares to participate in dividends but does not contractually require the holders of such shares to participate in the Company’s losses. For periods in which the Company reports net losses, diluted net loss per share is the same as basic net loss per share because potentially dilutive common shares are not assumed to have been issued if their effect is anti-dilutive.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements	The Company adopted ASU No. 2016-09, Compensation—Stock Compensation (Topic 718) beginning January 1, 2018. The Company has elected to continue to estimate expected forfeitures as awards are granted. Additionally, the Company will prospectively present excess tax benefits as an operating activity on the consolidated statement of cash flows. The Company recognized the previously unrecognized excess tax benefits using the modified retrospective transition method, which did not result in a cumulative-effect adjustment to the opening balance of accumulated deficit in 2018 given the Company’s valuation allowance position. Without the valuation allowance, the Company’s deferred tax assets would have increased by $3.4 million . The Company adopted ASU 2016-15, Statement of Cash Flows (Topic 230): Clarifying the Classification of Certain Cash Receipts and Cash Payments beginning January 1, 2018 using a retrospective approach. This standard applies to the Company’s reporting requirements in the recording of debt prepayment and debt extinguishment and has been reflected in the consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350) : Simplifying the Test for Goodwill Impairment , which eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. This standard is effective for public business entities for the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. All other entities should adopt this update for the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2021. Early adoption is permitted. This standard will apply to the Company’s reporting requirements in performing goodwill impairment testing and the Company plans to adopt this standard January 1, 2019. The Company does not anticipate the adoption of this standard will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business , which clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. This standard is effective for public business entities for annual periods beginning after December 15, 2017, including interim periods within those periods. For all other entities, this standard is effective for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. The impact to the Company’s consolidated financial statements will depend on the facts and circumstances of any specific future transactions. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) which requires lessees to put most leases on their balance sheets but recognize expenses on their income statement and eliminates the real estate-specific provisions for all entities. The guidance is effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. For all other entities, the amendments to the standard are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The Company intends to adopt this standard beginning January 1, 2020 and is currently evaluating the effect that implementation of this standard will have on its consolidated financial statements upon adoption. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and Other Assets and Deferred Costs—Contracts with Customers (Subtopic 340-40) , which will supersede nearly all existing revenue recognition guidance. The core principle behind this standard is that an entity should recognize revenue to depict the transfer of promised goods and services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for delivering those goods and services. To achieve this core principle, the ASU provides a model, which involves a five-step process that includes identifying the contract with the customer, identifying the performance obligations in the contract, determining the transaction price, allocating the transaction prices to the performance obligations in the contract, and recognizing revenue when (or as) the entity satisfies the performance obligations. The standard also provides guidance on the recognition of costs related to obtaining customer contracts. This standard permits adoption either by using a full retrospective approach, in which all comparative periods are presented in accordance with the new standard, or a modified retrospective approach with the cumulative effect of initially applying the new standard recognized at the date of initial application and providing certain additional disclosures. For public business entities, this standard is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. For all other entities, this standard is effective for annual reporting periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early application is permitted for annual periods beginning after December 15, 2016. The Company has elected to adopt this standard as of January 1, 2019 using the full retrospective approach and does not expect the adoption of this standard to have a material impact on its consolidated financial statements. As an emerging growth company (EGC), the Jump-start Our Business Start-ups Act (JOBS Act), allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to other public companies.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Reconciliation of Cash and Restricted Cash	The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands): December 31, 2018 2017 2016 Cash and cash equivalents $ 437,892 $ 188,986 $ 139,538 Restricted cash 1,508 3,235 4,000 Total cash, cash equivalents and restricted cash $ 439,400 $ 192,221 $ 143,538
Reconciliation of Cash and Restricted Cash	The following table provides a reconciliation of cash and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows (in thousands): December 31, 2018 2017 2016 Cash and cash equivalents $ 437,892 $ 188,986 $ 139,538 Restricted cash 1,508 3,235 4,000 Total cash, cash equivalents and restricted cash $ 439,400 $ 192,221 $ 143,538
Estimated Useful Lives of Property and Equipment	The estimated useful lives of the Company’s property, plant and equipment are as follows: Estimated Useful Life Building and improvements 30 years Furniture and fixtures 3-5 years Computers and computer equipment 1-2 years Computer software 2-3 years Capitalized internal-use software development costs 2 years Leasehold improvements Shorter of estimated useful life or remaining lease term Property, plant and equipment, net consisted of the following as of the dates indicated (in thousands): December 31, 2018 2017 Building and improvements $ 33,277 $ 33,277 Capitalized internal-use software development costs 35,201 27,392 Furniture and fixtures 3,557 3,206 Computers and computer equipment 11,676 9,716 Leasehold improvements 5,084 2,950 88,795 76,541 Less: Accumulated depreciation and amortization (44,576 ) (34,049 ) Property, plant and equipment, net $ 44,219 $ 42,492

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Summary of the Estimated Fair Values of Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the respective acquisition dates (in thousands): Picatic Ticketea Total Cash $ 160 $ 17,852 $ 18,012 Funds and accounts receivable 10 1,058 1,068 Creator advances — 532 532 Prepaid expenses and other current assets 87 127 214 Property and equipment — 42 42 Other noncurrent assets — 28 28 Accounts payable, creators — (19,671 ) (19,671 ) Other current liabilities (121 ) (628 ) (749 ) Intangible assets 507 3,094 3,601 Goodwill 2,219 8,937 11,156 Total purchase price $ 2,862 $ 11,371 $ 14,233 The following table summarizes the fair values of the assets acquired and liabilities assumed as of the respective acquisition dates (in thousands): Ticketfly ticketscript Total Cash and restricted cash $ 23,339 $ 3,492 $ 26,831 Funds and accounts receivable 4,263 4,208 8,471 Creator advances 8,567 — 8,567 Prepaid expenses and other current assets 1,213 242 1,455 Property and equipment 2,619 425 3,044 Other noncurrent assets 15 238 253 Accounts payable, creators (29,909 ) (7,950 ) (37,859 ) Other current liabilities (2,138 ) (836 ) (2,974 ) Accrued taxes (6,179 ) (1,799 ) (7,978 ) Deferred tax liabilities — (2,401 ) (2,401 ) Intangible assets 76,300 11,800 88,100 Goodwill 123,011 26,030 149,041 Total purchase price $ 201,101 $ 33,449 $ 234,550
Finite-Lived Intangible Assets Acquired as Part of Business Combination	The following table sets forth the components of identifiable intangible assets acquired (in thousands) and their estimated useful lives as of the date of acquisition (in years): Picatic Estimated Ticketea Estimated Customer relationships $ 507 2.5 $ 2,475 5.0 Developed technology — 619 1.0 Total acquired intangible assets $ 507 $ 3,094 The following table sets forth the components of identifiable intangible assets acquired (in thousands) and their estimated useful lives as of the date of acquisition (in years): Ticketfly Estimated useful life ticketscript Estimated useful life Customer relationships $ 60,500 8.0 $ 10,600 5.0 Developed technology 14,500 1.3 1,100 1.0 Trademark 1,300 1.3 100 1.0 Total acquired intangible assets $ 76,300 $ 11,800
Pro Forma Information	The following unaudited pro forma information presents the combined results of operations as if the Ticketfly acquisition had been completed on January 1, 2016, the beginning of the comparable prior annual reporting period. The pro forma results include the adjustments for amortization associated with the acquired intangible assets, interest expense on new debt, stock-based compensation and the inclusion of $0.5 million of non-recurring acquisition costs. The pro forma results do not reflect any cost saving synergies from operating efficiencies of the effect of the incremental costs incurred in integrating the companies. Accordingly, these pro forma results are presented for informational purpose only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisition had occurred at the beginning of the period presented, nor are they indicative of future results of operations (in thousands): Year Ended December 31, 2017 Net revenue $ 235,096 Net loss (199,222 )

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the Carrying Amounts of Goodwill	The changes in the carrying amounts of goodwill was as follows (in thousands): January 1, 2017 $ 9,725 Additions from acquisitions 149,041 At December 31, 2017 158,766 Additions from acquisitions 11,023 Measurement period and other adjustments 771 At December 31, 2018 $ 170,560
Acquired Intangible Assets	Acquired intangible assets consisted of the following as of the dates indicated (in thousands): December 31, 2017 Cost Accumulated Net Book Weighted- Developed technology $ 18,477 $ 6,679 $ 11,798 1.0 Customer relationships 71,502 4,743 66,759 7.2 Tradenames 1,600 616 984 1.0 Acquired intangible assets, net $ 91,579 $ 12,038 $ 79,541 December 31, 2018 Cost Accumulated Net Book Weighted- Developed technology $ 19,096 $ 18,628 $ 468 0.8 Customer relationships 74,484 14,979 59,505 6.2 Tradenames 1,600 1,600 — 0.0 Acquired intangible assets, net $ 95,180 $ 35,207 $ 59,973
Amortization Expense Related to Acquired Intangible Assets	The Company recorded amortization expense related to acquired intangible assets as follows (in thousands): Year Ended December 31, 2018 2017 2016 Cost of net revenue $ 11,834 $ 5,083 $ 470 General and administrative 11,334 5,160 157 Total amortization of acquired intangible assets $ 23,168 $ 10,243 $ 627
Total Expected Future Amortization Expense for Acquired Intangible Assets	As of December 31, 2018 , the total expected future amortization expense of acquired intangible assets by year is as follows (in thousands): 2019 $ 10,825 2020 10,443 2021 10,197 2022 8,202 Thereafter 20,306 Acquired intangible assets, net $ 59,973

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Summary of Accounts Receivable	The following table summarizes the Company’s accounts receivable balance (in thousands): December 31, 2018 2017 2016 Accounts receivable, customers $ 5,651 $ 4,682 $ 3,081 Allowance for doubtful accounts (1,582 ) (1,797 ) (1,099 ) Accounts receivable, net $ 4,069 $ 2,885 $ 1,982 The following table summarizes the activity in creator advances for the periods indicated (in thousands): December 31, 2018 2017 Balance, beginning of period $ 20,076 $ 7,583 Acquired with Ticketfly transaction — 8,567 Acquired with Ticketea transaction 532 — Creator advances paid 21,466 14,701 Creator advances recouped (16,158 ) (8,681 ) Write-offs and other adjustments (2,774 ) (2,094 ) Balance, end of period $ 23,142 $ 20,076 Creator advances, net $ 21,255 $ 17,641 Creator advances, noncurrent 1,887 2,435

Creator Signing Fees, Net (Tabl

Creator Signing Fees, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Creator Signing Fees, Net	The following table summarizes the activity in creator signing fees (in thousands): December 31, 2018 2017 Balance, beginning of period $ 10,421 $ 6,906 Creator signing fees paid 15,973 8,552 Amortization of creator signing fees (7,086 ) (4,314 ) Write-offs and other adjustments (2,303 ) (723 ) Balance, end of period $ 17,005 $ 10,421 Creator signing fees, net $ 7,324 $ 4,235 Creator signing fees, noncurrent 9,681 6,186

Creator Advances, Net (Tables)

Creator Advances, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Summary of Activity in Creator Advances	The following table summarizes the Company’s accounts receivable balance (in thousands): December 31, 2018 2017 2016 Accounts receivable, customers $ 5,651 $ 4,682 $ 3,081 Allowance for doubtful accounts (1,582 ) (1,797 ) (1,099 ) Accounts receivable, net $ 4,069 $ 2,885 $ 1,982 The following table summarizes the activity in creator advances for the periods indicated (in thousands): December 31, 2018 2017 Balance, beginning of period $ 20,076 $ 7,583 Acquired with Ticketfly transaction — 8,567 Acquired with Ticketea transaction 532 — Creator advances paid 21,466 14,701 Creator advances recouped (16,158 ) (8,681 ) Write-offs and other adjustments (2,774 ) (2,094 ) Balance, end of period $ 23,142 $ 20,076 Creator advances, net $ 21,255 $ 17,641 Creator advances, noncurrent 1,887 2,435

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	The estimated useful lives of the Company’s property, plant and equipment are as follows: Estimated Useful Life Building and improvements 30 years Furniture and fixtures 3-5 years Computers and computer equipment 1-2 years Computer software 2-3 years Capitalized internal-use software development costs 2 years Leasehold improvements Shorter of estimated useful life or remaining lease term Property, plant and equipment, net consisted of the following as of the dates indicated (in thousands): December 31, 2018 2017 Building and improvements $ 33,277 $ 33,277 Capitalized internal-use software development costs 35,201 27,392 Furniture and fixtures 3,557 3,206 Computers and computer equipment 11,676 9,716 Leasehold improvements 5,084 2,950 88,795 76,541 Less: Accumulated depreciation and amortization (44,576 ) (34,049 ) Property, plant and equipment, net $ 44,219 $ 42,492
Capitalized Internal-Use Software Development Costs	The Company recorded the following amounts related to capitalized internal-use software development costs during the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Internal-use software development costs capitalized during the period $ 7,809 $ 6,725 $ 6,050 Amortization of capitalized internal-use software 6,240 5,102 4,458 Impairments of capitalized internal-use software — 88 490

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments and Sublease Rental Payments under Noncancelable Capital Leases	As of December 31, 2018 , the future minimum lease payments and sublease rental payments under noncancelable leases are as follows (in thousands): Build-to-Suit Operating Sublease Total 2019 $ 5,604 $ 2,514 $ (4,003 ) $ 4,115 2020 5,772 2,360 (4,003 ) 4,129 2021 1,942 1,870 (1,167 ) 2,645 2022 — 1,678 — 1,678 2023 — 1,483 — 1,483 Thereafter — 3,770 — 3,770 Total minimum payments (income) 13,318 13,675 (9,173 ) 17,820 Less: Amount representing interest and taxes (7,564 ) — — (7,564 ) Total $ 5,754 $ 13,675 $ (9,173 ) $ 10,256
Future Minimum Lease Payments and Sublease Rental Payments under Noncancelable Operating Leases	As of December 31, 2018 , the future minimum lease payments and sublease rental payments under noncancelable leases are as follows (in thousands): Build-to-Suit Operating Sublease Total 2019 $ 5,604 $ 2,514 $ (4,003 ) $ 4,115 2020 5,772 2,360 (4,003 ) 4,129 2021 1,942 1,870 (1,167 ) 2,645 2022 — 1,678 — 1,678 2023 — 1,483 — 1,483 Thereafter — 3,770 — 3,770 Total minimum payments (income) 13,318 13,675 (9,173 ) 17,820 Less: Amount representing interest and taxes (7,564 ) — — (7,564 ) Total $ 5,754 $ 13,675 $ (9,173 ) $ 10,256
Future Creator Payments Committed to under Contract but Not Yet Paid	The following table presents, by year, the future creator payments committed to under contract but not yet paid as of December 31, 2018 (in thousands): 2019 $ 8,328 2020 3,578 2021 386 2022 19 2023 and thereafter — $ 12,311

Term Loans and Debt (Tables)

Term Loans and Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Term Loans	Term loans consisted of the following at the dates indicated (in thousands): December 31, 2018 2017 Outstanding principal balance and accrued interest $ 73,594 $ 29,704 Less: Unamortized discount and debt issuance costs (872 ) (3,035 ) Total term loans $ 72,722 $ 26,669 Current portion of term loans $ 5,635 $ — Term loans 67,087 26,669
Contractual Principal Payments for the Next Five Years	As of December 31, 2018 , the contractual principal payments for the New Term Loans for the next five years are as follows (in thousands): 2019 $ 5,625 2020 6,563 2021 7,500 2022 7,500 2023 46,406 Total $ 73,594

Redeemable Convertible Prefer_2

Redeemable Convertible Preferred Stock Warrants (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Changes in the Liability Relating to Redeemable Convertible Preferred Stock Warrants	The following table represents the changes in the liability relating to the redeemable convertible preferred stock warrants (in thousands): Balance as of January 1, 2017 $ — Issuances 5,071 Change in fair value 2,200 Balance as of December 31, 2017 7,271 Issuances 4,603 Change in fair value 9,591 Automatic conversion in connection with initial public offering (21,465 ) Balance as of December 31, 2018 $ —

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of stock option activity	Stock option activity under the Plans is as follows: Outstanding Weighted- Weighted- Aggregate Balance as of December 31, 2016 13,669,181 $ 4.60 5.9 $ 26,710 Granted 7,332,168 7.06 Exercised (1,376,872 ) 1.24 7,600 Cancelled (923,210 ) 6.14 Balance as of December 31, 2017 18,701,267 5.73 7.3 29,728 Granted 6,824,057 12.68 Exercised (1,727,899 ) 4.69 16,816 Cancelled (1,784,828 ) 7.19 Balance as of December 31, 2018 22,012,597 7.85 7.1 439,382 Vested and exercisable as of December 31, 2017 10,731,138 4.72 5.5 28,112 Vested and expected to vest as of December 31, 2017 17,781,271 5.65 6.8 29,978 Vested and exercisable as of December 31, 2018 12,462,693 5.75 5.6 274,883 Vested and expected to vest as of December 31, 2018 20,926,797 7.69 7.0 421,047
Schedule of assumptions used to estimate fair value of stock options	The following range of assumptions were used to estimate the fair value of stock options granted to employees: Year Ended December 31, 2018 2017 2016 Expected dividend yield — — — Expected volatility 43.5 - 48.2% 40.7 - 57.1% 57.6 - 62.8% Risk-free interest rate 2.96 - 3.09% 1.92 - 2.1% 1.14 - 1.93% Expected term (years) 5.28 - 6.08 5.02 - 6.08 6.02 - 6.08
Schedule of assumptions used to estimate purchase rights under the ESPP	The following range of assumptions were used to estimate the purchase rights granted under the 2018 ESPP on the first day of the offering period: Year Ended December 31, 2018 Expected dividend yield — Expected volatility 48.52% Risk-free interest rate 2.37% Expected term (years) 0.69
Schedule of nonvested restricted stock unit	Restricted stock activity for the year ended December 31, 2018 is presented as follows: Outstanding RSUs and RSAs Weighted-average grant date fair value per share Weighted- Aggregate Balance at December 31, 2017 802,900 $ 8.65 Vested (805,893 ) Awarded 686,072 16.09 Cancelled (8,799 ) 31.79 Balance at December 31, 2018 674,280 24.75 1.9 $ 18,752 Vested and expected to vest as of December 31, 2018 532,623 24.80 1.7 14,812

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): Year Ended December 31, 2018 2017 2016 Net loss $ (64,078 ) $ (38,547 ) $ (40,392 ) Weighted-average shares used in computing net loss per share, basic and diluted 37,540 19,500 16,291 Net loss per share, basic and diluted $ (1.71 ) $ (1.98 ) $ (2.48 )
Potentially Dilutive Securities Excluded from the Computation of Diluted Net Loss Per Share	The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect (in thousands): December 31, 2018 2017 2016 Redeemable convertible preferred stock — 41,628 33,446 Stock-options to purchase common stock 22,013 18,701 13,709 Redeemable convertible preferred stock warrants — 618 — Restricted stock units 686 803 803 Early exercised options 56 115 151 Total 22,755 61,865 48,109

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Loss before Income Tax	Loss before the provision for (benefit from) income taxes consisted of the following for the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Domestic $ (50,133 ) $ (31,681 ) $ (37,901 ) International (12,795 ) (6,879 ) (2,360 ) Total $ (62,928 ) $ (38,560 ) $ (40,261 )
Schedule of Components of Income Tax Provision (Benefit)	The components of the Company's income tax provision (benefit) were as follows for the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Current tax expense Federal $ 234 $ — $ — State (10 ) 109 19 Foreign 823 278 170 Total current tax expense 1,047 387 189 Deferred tax expense (benefit) Federal 317 99 15 State 153 55 1 Foreign (367 ) (554 ) (74 ) Total deferred tax expense (benefit) 103 (400 ) (58 ) Total income tax provision (benefit) $ 1,150 $ (13 ) $ 131
Reconciliation of the Statutory to Effective Tax Provision	The reconciliation of the Federal statutory income tax provision to the Company’s effective income tax provision is as follows for the periods indicated (in thousands): Year Ended December 31, 2018 2017 2016 Federal tax benefit at statutory rate $ (13,298 ) $ (13,147 ) $ (13,733 ) State tax (10 ) 2,009 20 Foreign rate differential 1,315 2,513 1,125 Non-deductible permanent items 4,129 1,142 693 Stock-based compensation (1,178 ) 1,950 2,184 Tax credits (922 ) (1,702 ) — Change in valuation allowance 11,114 (14,653 ) 9,842 Tax Act-revaluation of deferred taxes — 21,875 — Total $ 1,150 $ (13 ) $ 131
Schedule of Deferred Tax Assets and Liabilities	The Company’s deferred tax assets and liabilities as of the dates indicated were as follows (in thousands): Year Ended December 31, 2018 2017 Deferred tax assets: Net operating losses $ 50,154 $ 39,970 Accrual and reserves 7,725 7,845 Tax credit carry-forward 8,503 6,683 Stock-based compensation 5,944 3,642 Depreciation and amortization 4,735 2,593 Total deferred tax assets 77,061 60,733 Valuation allowance (75,436 ) (58,748 ) Net deferred tax assets 1,625 1,985 Deferred tax liabilities: Depreciation and amortization (3,665 ) (3,925 ) Net deferred taxes $ (2,040 ) $ (1,940 )
Deferred Tax Asset Valuation Allowance Activity	The activity in the Company's deferred tax asset valuation allowance for the periods indicated was as follows (in thousands): Year Ended December 31, 2018 2017 2016 Balance, beginning of period $ 58,748 $ 59,806 $ 48,390 Charged to costs and expenses 13,243 — 11,416 Charged to other accounts 3,445 — — Deductions — (1,058 ) — Balance, end of period $ 75,436 $ 58,748 $ 59,806
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the unrecognized tax benefit for the periods indicated is as follows (in thousands): Balance as of December 31, 2016 $ — Gross amount of increases in unrecognized tax benefits for tax positions taken in current year 1,526 Gross amount of increases in unrecognized tax benefits for tax positions taken in prior period 3,970 Balance as of December 31, 2017 5,496 Gross amount of increases in unrecognized tax benefits for tax positions taken in current year 1,744 Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior period — Balance as of December 31, 2018 $ 7,240

Geographic Information (Tables)

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Net Revenue By Geography	The following table presents the Company's total net revenue by geography based on the currency of the underlying transaction (in thousands): Year Ended December 31, 2018 2017 2016 United States $ 211,705 $ 141,118 $ 97,454 International 79,906 60,479 36,045 Total net revenue $ 291,611 $ 201,597 $ 133,499

Organization (Details)

Organization (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Aggregate net proceeds		$ 245,985
Offering costs		$ 5,450
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)	41,628,207
Series G Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)	933,269
Conversion of Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)		(41,628,207)
IPO
Class of Stock [Line Items]
Offering price (in dollars per share)	$ 23
Aggregate net proceeds	$ 246,000
Offering costs	$ 5,500
Class A Common Stock | IPO
Class of Stock [Line Items]
Shares issued in initial public offering (in shares)	11,500,000
Offering price (in dollars per share)	$ 23
Class A Common Stock | Over-Allotment Option
Class of Stock [Line Items]
Shares issued in initial public offering (in shares)	1,500,000
Class B Common Stock | Common Stock | Conversion of Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)	42,188,624	42,188,624
Class B Common Stock | Common Stock | Conversion of Warrants
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)	997,193	997,193

Significant Accounting Polici_4

Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2018USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments | segment	1
Number of operating segments | segment	1
Cash and cash equivalents	$ 437,892,000	$ 188,986,000	$ 139,538,000
Funds receivable	58,697,000	51,639,000
Goodwill impairment charges	$ 0	0
Accounts payable, unremitted ticket sale proceeds, net of fees and taxes	5 days
Advertising expense	$ 1,600,000	1,900,000	2,100,000
Deferred offering costs	5,500,000
Foreign currency remeasurement gain (loss)	(6,500,000)	3,100,000	$ (2,000,000)
Deferred tax assets	77,061,000	60,733,000
ASU 2016-09
Significant Accounting Policies [Line Items]
Deferred tax assets				$ 3,400,000
Tickets Sold on Behalf of Creators
Significant Accounting Policies [Line Items]
Funds receivable	54,800,000	48,500,000
Creator Cash
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 217,400,000	$ 179,500,000
Capitalized internal-use software development costs
Significant Accounting Policies [Line Items]
Estimated useful life	2 years

Significant Accounting Polici_5

Significant Accounting Policies - Reconciliation of Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Cash and cash equivalents	$ 437,892	$ 188,986	$ 139,538
Restricted cash	1,508	3,235	4,000
Total cash, cash equivalents and restricted cash	$ 439,400	$ 192,221	$ 143,538	$ 148,587

Significant Accounting Polici_6

Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
Building and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computers and computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	1 year
Computers and computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years

Acquisitions - 2018 Acquisition

Acquisitions - 2018 Acquisitions, Narrative (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended		12 Months Ended
	Aug. 31, 2018	Apr. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Revenue of acquiree since acquisition date			$ 3.7
Picatic e-Tickets
Business Acquisition [Line Items]
Consideration transferred	$ 2.9
Payments to acquire businesses	$ 1.3
Shares issued as consideration (in shares)	81
Acquisition costs			0.3
Ticketea S.L.
Business Acquisition [Line Items]
Consideration transferred		$ 11.4
Payments to acquire businesses		$ 3.6
Shares issued as consideration (in shares)		700
Acquisition costs			$ 0.5
Number of shares held in escrow (in shares)		100
Escrow period		18 months

Acquisitions - 2018 Acquisiti_2

Acquisitions - 2018 Acquisitions Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Aug. 31, 2018	Apr. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash		$ 18,012
Funds and accounts receivable		1,068
Creator advances		532
Prepaid expenses and other current assets		214
Property and equipment		42
Other noncurrent assets		28
Accounts payable, creators		(19,671)
Other current liabilities		(749)
Intangible assets		3,601
Goodwill	$ 170,560	11,156		$ 158,766	$ 9,725
Total purchase price		14,233
Picatic e-Tickets
Business Acquisition [Line Items]
Cash		160
Funds and accounts receivable		10
Creator advances		0
Prepaid expenses and other current assets		87
Property and equipment		0
Other noncurrent assets		0
Accounts payable, creators		0
Other current liabilities		(121)
Intangible assets		507
Goodwill		2,219
Total purchase price		$ 2,862
Ticketea S.L.
Business Acquisition [Line Items]
Cash			$ 17,852
Funds and accounts receivable			1,058
Creator advances			532
Prepaid expenses and other current assets			127
Property and equipment			42
Other noncurrent assets			28
Accounts payable, creators			(19,671)
Other current liabilities			(628)
Intangible assets			3,094
Goodwill			8,937
Total purchase price			$ 11,371

Acquisitions - 2018 Acquired In

Acquisitions - 2018 Acquired Intangible Assets (Details) - USD ($) $ in Thousands	1 Months Ended
	Aug. 31, 2018	Apr. 30, 2018
Picatic e-Tickets
Business Acquisition [Line Items]
Acquired intangible assets	$ 507
Ticketea S.L.
Business Acquisition [Line Items]
Acquired intangible assets		$ 3,094
Customer relationships | Picatic e-Tickets
Business Acquisition [Line Items]
Acquired intangible assets	$ 507
Weighted-average remaining useful life	2 years 6 months
Customer relationships | Ticketea S.L.
Business Acquisition [Line Items]
Acquired intangible assets		$ 2,475
Weighted-average remaining useful life		5 years
Developed technology | Picatic e-Tickets
Business Acquisition [Line Items]
Acquired intangible assets	$ 0
Developed technology | Ticketea S.L.
Business Acquisition [Line Items]
Acquired intangible assets		$ 619
Weighted-average remaining useful life		1 year

Acquisitions - 2017 Acquisition

Acquisitions - 2017 Acquisitions, Narrative (Details) - USD ($) $ in Thousands, shares in Millions	1 Months Ended				12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jan. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Repayment of long-term debt					$ 111,071	$ 7,788	$ 0
Loss on debt extinguishment					(178)	0	0
Revenue of acquiree since acquisition date					3,700
Net loss					$ 64,078	$ 38,547	$ 40,392
Convertible Notes Payable | Promissory Note
Business Acquisition [Line Items]
Term of debt instrument			5 years
Annual interest rate			6.50%
Aggregate principal amount		$ 50,000
Repayment of long-term debt		34,700
Repayments of principal		33,000
Payments of interest		1,700
Loss on debt extinguishment		$ 17,000
TSTM Group Limited
Business Acquisition [Line Items]
Percentage of interests acquired				100.00%
Consideration transferred				$ 33,400
Payments to acquire businesses				7,700
Consideration transferred liabilities incurred				$ 7,500
Shares issued as consideration (in shares)				2.7
Number of options issued as consideration (in shares)				0.3
Acquisition costs				$ 1,200
Ticketfly, LLC
Business Acquisition [Line Items]
Percentage of interests acquired			100.00%
Consideration transferred			$ 201,100
Payments to acquire businesses			151,100
Consideration transferred liabilities incurred			50,000
Acquisition costs			$ 500
Ticketfly, LLC | Non-Recurring Acquisition Costs
Business Acquisition [Line Items]
Net loss	$ 500

Acquisitions - 2017 Acquisiti_2

Acquisitions - 2017 Acquisition Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Aug. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jan. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Funds and accounts receivable		$ 1,068
Creator advances		532
Prepaid expenses and other current assets		214
Property and equipment		42
Other noncurrent assets		28
Accounts payable, creators		(19,671)
Other current liabilities		(749)
Intangible assets		3,601
Goodwill	$ 170,560	11,156	$ 158,766			$ 9,725
Total purchase price		$ 14,233
Total
Business Acquisition [Line Items]
Cash and restricted cash			26,831
Funds and accounts receivable			8,471
Creator advances			8,567
Prepaid expenses and other current assets			1,455
Property and equipment			3,044
Other noncurrent assets			253
Accounts payable, creators			(37,859)
Other current liabilities			(2,974)
Accrued taxes			(7,978)
Deferred tax liabilities			(2,401)
Intangible assets			88,100
Goodwill			149,041
Total purchase price			$ 234,550
Ticketfly, LLC
Business Acquisition [Line Items]
Cash and restricted cash				$ 23,339
Funds and accounts receivable				4,263
Creator advances				8,567
Prepaid expenses and other current assets				1,213
Property and equipment				2,619
Other noncurrent assets				15
Accounts payable, creators				(29,909)
Other current liabilities				(2,138)
Accrued taxes				(6,179)
Deferred tax liabilities				0
Intangible assets				76,300
Goodwill				123,011
Total purchase price				$ 201,101
TSTM Group Limited
Business Acquisition [Line Items]
Cash and restricted cash					$ 3,492
Funds and accounts receivable					4,208
Creator advances					0
Prepaid expenses and other current assets					242
Property and equipment					425
Other noncurrent assets					238
Accounts payable, creators					(7,950)
Other current liabilities					(836)
Accrued taxes					(1,799)
Deferred tax liabilities					(2,401)
Intangible assets					11,800
Goodwill					26,030
Total purchase price					$ 33,449

Acquisitions - 2017 Acquired In

Acquisitions - 2017 Acquired Intangible Assets (Details) - USD ($) $ in Thousands	1 Months Ended
	Sep. 30, 2017	Jan. 31, 2017
Ticketfly
Business Acquisition [Line Items]
Acquired intangible assets	$ 76,300
ticketscript
Business Acquisition [Line Items]
Acquired intangible assets		$ 11,800
Customer relationships | Ticketfly
Business Acquisition [Line Items]
Acquired intangible assets	$ 60,500
Weighted-average remaining useful life	8 years
Customer relationships | ticketscript
Business Acquisition [Line Items]
Acquired intangible assets		$ 10,600
Weighted-average remaining useful life		5 years
Developed technology | Ticketfly
Business Acquisition [Line Items]
Acquired intangible assets	$ 14,500
Weighted-average remaining useful life	1 year 4 months
Developed technology | ticketscript
Business Acquisition [Line Items]
Acquired intangible assets		$ 1,100
Weighted-average remaining useful life		1 year
Trademark | Ticketfly
Business Acquisition [Line Items]
Acquired intangible assets	$ 1,300
Weighted-average remaining useful life	1 year 4 months
Trademark | ticketscript
Business Acquisition [Line Items]
Acquired intangible assets		$ 100
Weighted-average remaining useful life		1 year

Acquisitions - Pro Forma Inform

Acquisitions - Pro Forma Information (Details) - Ticketfly $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Net revenue	$ 235,096
Net loss	$ (199,222)

Goodwill and Acquired Intangi_3

Goodwill and Acquired Intangible Assets, Net - Changes in the Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance	$ 158,766	$ 9,725
Additions from acquisitions	11,023	149,041
Measurement period and other adjustments	771
Balance	$ 170,560	$ 158,766

Goodwill and Acquired Intangi_4

Goodwill and Acquired Intangible Assets, Net - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired intangible assets, net:
Cost	$ 95,180	$ 91,579
Accumulated amortization	35,207	12,038
Acquired intangible assets, net	59,973	79,541
Developed technology
Acquired intangible assets, net:
Cost	19,096	18,477
Accumulated amortization	18,628	6,679
Acquired intangible assets, net	$ 468	$ 11,798
Weighted- average remaining useful life	287 days	1 year
Customer relationships
Acquired intangible assets, net:
Cost	$ 74,484	$ 71,502
Accumulated amortization	14,979	4,743
Acquired intangible assets, net	$ 59,505	$ 66,759
Weighted- average remaining useful life	2249 days	7 years 2 months 12 days
Tradenames
Acquired intangible assets, net:
Cost	$ 1,600	$ 1,600
Accumulated amortization	1,600	616
Acquired intangible assets, net	$ 0	$ 984
Weighted- average remaining useful life	0 years	1 year

Goodwill and Acquired Intangi_5

Goodwill and Acquired Intangible Assets, Net - Amortization Expense Related to Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 23,168	$ 10,243	$ 627
Cost of net revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	11,834	5,083	470
General and administrative
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 11,334	$ 5,160	$ 157

Goodwill and Acquired Intangi_6

Goodwill and Acquired Intangible Assets, Net - Total Expected Future Amortization Expense for Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2,019	$ 10,825
2,020	10,443
2,021	10,197
2,022	8,202
Thereafter	20,306
Acquired intangible assets, net	$ 59,973	$ 79,541

Accounts Receivable, Net (Detai

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Accounts receivable, customers	$ 5,651	$ 4,682	$ 3,081
Allowance for doubtful accounts	(1,582)	(1,797)	(1,099)
Accounts receivable, net	$ 4,069	$ 2,885	$ 1,982

Creator Signing Fees, Net (Deta

Creator Signing Fees, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer [Abstract]
Creator signing fees, amortization period	3 years 3 months 20 days
Activity in creator signing fees:
Balance, beginning of period	$ 10,421	$ 6,906
Creator signing fees paid	15,973	8,552
Amortization of creator signing fees	(7,086)	(4,314)	$ (2,737)
Write-offs and other adjustments	(2,303)	(723)
Balance, end of period	17,005	10,421	$ 6,906
Creator signing fees, net	7,324	4,235
Creator signing fees, noncurrent	$ 9,681	$ 6,186

Creator Advances, Net (Details)

Creator Advances, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Activity In Notes, Loans And Financing Receivable [Roll Forward]
Balance, beginning of period	$ 20,076	$ 7,583
Creator advances paid	21,466	14,701
Creator advances recouped	(16,158)	(8,681)
Write-offs and other adjustments	(2,774)	(2,094)
Balance, end of period	23,142	20,076
Creator advances, net	21,255	17,641
Creator advances, noncurrent	1,887	2,435
Ticketfly
Activity In Notes, Loans And Financing Receivable [Roll Forward]
Acquired with transaction	0	8,567
Ticketea
Activity In Notes, Loans And Financing Receivable [Roll Forward]
Acquired with transaction	$ 532	$ 0

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 88,795	$ 76,541
Less: Accumulated depreciation and amortization	(44,576)	(34,049)
Property, plant and equipment, net	44,219	42,492
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,277	33,277
Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,201	27,392
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,557	3,206
Computers and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,676	9,716
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,084	$ 2,950

Property, Plant and Equipment_4

Property, Plant and Equipment, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 5.2	$ 4.1	$ 2.6
Stock-based compensation costs included in capitalized internal-use software and website development costs capitalized	$ 0.6	$ 0.6	$ 0.6

Property, Plant and Equipment_5

Property, Plant and Equipment, Net - Capitalized Internal-Use Software Development Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Internal-use software development costs capitalized during the period	$ 7,809	$ 6,725	$ 6,050
Amortization of capitalized internal-use software	6,240	5,102	4,458
Impairments of capitalized internal-use software	$ 0	$ 88	$ 490

Commitments and Contingencies -

Commitments and Contingencies - Operating Leases and Build-to-Suit Lease (Details) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2013USD ($)ft²	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	May 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Rent expense from operating leases		$ 3	$ 2.1	$ 1.5
Sublease income		3.6	3.1	3.2
Area of office space (in square feet) | ft²	97,624
Capital Leased Assets [Line Items]
Initial built-to-suit lease term	7 years
Renewal term	3 years
Tenant improvement reimbursement allowance	$ 6.4
Capital lease asset	$ 22.3
Land lease expense		0.9	0.9	0.9
Interest expense related to build-to-suit lease		$ 3.4	$ 3.5	$ 3.5
Building
Capital Leased Assets [Line Items]
Estimated useful life		30 years
Property Subject To Operating Lease - Cork, Ireland
Capital Leased Assets [Line Items]
Operating lease term					10 years
Increase in annual operating lease obligations		$ 0.4

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments and Sublease Rental Payments under Noncancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Build-to-Suit Lease
2,019	$ 5,604
2,020	5,772
2,021	1,942
2,022	0
2,023	0
Thereafter	0
Total minimum payments (income)	13,318
Less: Amount representing interest and taxes	(7,564)
Total present value of minimum lease payments	5,754
Operating Leases
2,019	2,514
2,020	2,360
2,021	1,870
2,022	1,678
2,023	1,483
Thereafter	3,770
Total present value of minimum lease payments	13,675
Sublease Income
2,019	(4,003)
2,020	(4,003)
2,021	(1,167)
2,022	0
2,023	0
Thereafter	0
Total present value of minimum lease payments	(9,173)
Total
2,019	4,115
2,020	4,129
2,021	2,645
2,022	1,678
2,023	1,483
Thereafter	3,770
Total minimum payments (income)	17,820
Less: Amount representing interest and taxes	(7,564)
Total present value of minimum lease payments	$ 10,256

Commitments and Contingencies_3

Commitments and Contingencies - Letters of Credit (Details) $ in Millions	Dec. 31, 2018USD ($)
San Francisco Office Space Leases
Line of Credit Facility [Line Items]
Collateralizing letter of credit amount	$ 1
Collaterallizing Letter Of Credit | Ticketfly, LLC
Line of Credit Facility [Line Items]
Collateralizing letter of credit amount	$ 0.8

Commitments and Contingencies_4

Commitments and Contingencies - Future Creator Payments Committed to under Contract but Not Yet Paid (Details) - Future Creator Payments $ in Thousands	Dec. 31, 2018USD ($)
Other Commitments [Line Items]
2,019	$ 8,328
2,020	3,578
2,021	386
2,022	19
2023 and thereafter	0
Total	$ 12,311

Commitments and Contingencies_5

Commitments and Contingencies - Litigation and Loss Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss contingency accrual	$ 19.2	$ 28.9
Estimate of possible loss attributable to potential interest and penalties	1.2	$ 3.5
Potential costs associated with incident	7
Ticketfly Customer Data Breach
Loss Contingencies [Line Items]
Loss contingency accrual	0.3
Insurance proceeds	6.6
Receivable for insurance proceeds	0.6
Ticketfly Customer Data Breach | Contra Revenue
Loss Contingencies [Line Items]
Potential costs associated with incident	6.7
Ticketfly Customer Data Breach | Operating Expenses
Loss Contingencies [Line Items]
Potential costs associated with incident	$ 0.3

Term Loans and Debt - Term Loan

Term Loans and Debt - Term Loans (Details) - Line of Credit - Term Loan - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Outstanding principal balance and accrued interest	$ 73,594	$ 29,704
Less: Unamortized discount and debt issuance costs	(872)	(3,035)
Total term loan, net	72,722	26,669
Current portion of term loan	5,635	0
Term loans	$ 67,087	$ 26,669

Term Loans and Debt - Narrative

Term Loans and Debt - Narrative (Details) - USD ($)

1 Months Ended

12 Months Ended

Sep. 30, 2018

May 31, 2018

Mar. 31, 2018

Sep. 30, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Sep. 30, 2022

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2019

Jun. 30, 2017

Line of Credit Facility [Line Items]

Proceeds from term loans

$ 118,578,000

$ 30,000,000

$ 0

Fair value of embedded derivative asset

$ 2,100,000

4,200,000

Change in fair value of term loan embedded derivatives

2,119,000

0

0

Total cash repayment of long-term debt

111,071,000

7,788,000

0

Repayments of prepayment penalties and accrued interest

6,803,000

0

0

Loss on debt extinguishment

178,000

0

$ 0

Line of Credit | Term Loan

Line of Credit Facility [Line Items]

Long-term debt

72,722,000

$ 26,669,000

Line of Credit | Term Loan | Western Technology Investments Loan Facility

Line of Credit Facility [Line Items]

Total cash repayment of long-term debt

$ 81,600,000

Portion of cash repayment applied to long-term debt principal

74,200,000

Repayments of prepayment penalties and accrued interest

7,400,000

Long-term debt

68,700,000

0

Loss on debt extinguishment

17,200,000

$ 200,000

Line of Credit | Term Loan | First Western Technology Investments Loan Facility

Line of Credit Facility [Line Items]

Maximum borrowing capacity

$ 60,000,000

Line of Credit | Term Loan | First Loan Facility Due February 2022

Line of Credit Facility [Line Items]

Proceeds from term loans

$ 30,000,000

Annual interest rate

11.50%

Effective interest rate

15.90%

Period for which monthly payments of interest due

24 months

Period for which monthly payments of interest and principal due

30 months

Line of Credit | Term Loan | First Loan Facility Due September 2022

Line of Credit Facility [Line Items]

Proceeds from term loans

$ 30,000,000

Annual interest rate

11.75%

Effective interest rate

14.80%

Period for which monthly payments of interest due

24 months

Period for which monthly payments of interest and principal due

30 months

Line of Credit | Term Loan | Second Loan Facility

Line of Credit Facility [Line Items]

Maximum borrowing capacity

$ 15,000,000

Annual interest rate

12.00%

Effective interest rate

14.70%

Period for which monthly payments of interest due

24 months

Period for which monthly payments of interest and principal due

30 months

Prepayment covenant period to consummate IPO

24 months

Prepayment covenant period following consummation of IPO

15 days

Prepayment covenant percentage of interest incurred through the end of 24 months due

50.00%

Line of Credit | Term Loan | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Aggregate principal amount

75,000,000

Proceeds from issuance of debt

73,600,000

Payment of debt arrangement fees

1,100,000

Payment of debt upfront fees

300,000

Loan amortization rate

7.50%

Annual rate

4.88%

Line of Credit | Term Loan | Scenario, Forecast | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Loan amortization rate

10.00%

10.00%

10.00%

7.50%

Line of Credit | Revolving Credit Facility | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Maximum borrowing capacity

$ 75,000,000

Commitment fee rate

0.40%

Eurodollar | Line of Credit | Revolving Credit Facility | Minimum | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

2.25%

Eurodollar | Line of Credit | Revolving Credit Facility | Maximum | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

2.75%

Base Rate | Line of Credit | Revolving Credit Facility | Minimum | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

1.25%

Base Rate | Line of Credit | Revolving Credit Facility | Maximum | Senior Secured Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

1.75%

Term Loans and Debt - Contractu

Term Loans and Debt - Contractual Principal Payments for the Next Five Years (Details) - Term Loan - Senior Secured Credit Facility $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
2,019	$ 5,625
2,020	6,563
2,021	7,500
2,022	7,500
2,023	46,406
Total term loan, net	$ 73,594

Redeemable Convertible Prefer_3

Redeemable Convertible Preferred Stock Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Class of Warrant or Right [Line Items]
Proceeds from term loans				$ 118,578	$ 30,000	$ 0
Exercise price of Series G redeemable convertible preferred stock warrants (in dollars per share)	$ 16.3836
Expiration period	10 years
Line of Credit | Term Loan | First Loan Facility Due September 2022
Class of Warrant or Right [Line Items]
Proceeds from term loans		$ 30,000
Line of Credit | Term Loan | First Loan Facility Due February 2022
Class of Warrant or Right [Line Items]
Proceeds from term loans			$ 30,000
June 2017 Preferred Stock Warrants
Class of Warrant or Right [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)							411,991
September 2017 Preferred Stock Warrants
Class of Warrant or Right [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)			205,995
March 2018 Preferred Stock Warrants
Class of Warrant or Right [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)		205,995
May 2018 Preferred Stock Warrants
Class of Warrant or Right [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)	109,288

Redeemable Convertible Prefer_4

Redeemable Convertible Preferred Stock Warrants - Changes in the Liability Relating to Redeemable Convertible Preferred Stock Warrants (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in the liability relating to redeemable convertible preferred stock warrants:
Balance	$ 7,271	$ 0
Issuances	4,603	5,071	$ 0
Change in fair value	9,591	2,200	0
Automatic conversion in connection with initial public offering	(21,465)
Balance	$ 0	$ 7,271	$ 0

Stockholders' Equity - Redeemab

Stockholders' Equity - Redeemable Convertible Preferred Stock (Details) - $ / shares	1 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)	41,628,207
IPO
Class of Stock [Line Items]
Offering price (in dollars per share)	$ 23
Series G Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)	933,269
Conversion of Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)		(41,628,207)
Class B Common Stock | Conversion of Redeemable Convertible Preferred Stock | Common Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)	42,188,624	42,188,624
Class B Common Stock | Conversion of Warrants | Common Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)	997,193	997,193

Stockholders' Equity - Common S

Stockholders' Equity - Common Stock (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2018shares	Dec. 31, 2018USD ($)voteshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares	Dec. 31, 2010shares	Dec. 31, 2004shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued and outstanding (in shares)		22,012,597	18,701,267	13,669,181
Stock-based compensation expense | $		$ 30,231	$ 10,858	$ 8,531
2004 Plan, 2010 Plan and 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued and outstanding (in shares)		22,012,597
Number of shares available for grant (in shares)		10,867,313
2004 Plan, 2010 Plan and 2018 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Expiration period		10 years
2004 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)						6,000,000
2010 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)					30,663,761
2018 Stock Option and Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)	7,700,000	7,200,000
Number of votes per share | vote		1
2018 Stock Option and Incentive Plan | Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of votes per share | vote		10
2018 Employee Stock Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	1,534,500
Employee earnings contributed to ESPP (up to)	15.00%
Percent of fair market value at which employee's may purchase stock	85.00%
Shares purchased under the ESPP (in shares)		0
Stock-based compensation expense | $		$ 400
2018 Employee Stock Purchase Plan | Employee Stock | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase in shares reserved and available for issuance under the ESPP (in shares)		1,534,500
2018 Employee Stock Purchase Plan | Employee Stock | Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase in shares reserved and available for issuance under the ESPP		1.00%

Stockholders' Equity - Common_2

Stockholders' Equity - Common Stock Subject to Repurchase (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Common stock subject to repurchase related to stock options (in shares)	55,537	103,133
Liability related to early exercises of stock options	$ 0.4	$ 0.8

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Outstanding options
Balance (in shares)	18,701,267	13,669,181
Granted (in shares)	6,824,057	7,332,168
Exercised (in shares)	(1,727,899)	(1,376,872)
Cancelled (in shares)	(1,784,828)	(923,210)
Balance (in shares)	22,012,597	18,701,267	13,669,181
Vested and exercisable (in shares)	12,462,693	10,731,138
Vested and expected to vest (in shares)	20,926,797	17,781,271
Weighted- average exercise price
Balance (in dollars per share)	$ 5.73	$ 4.60
Granted (in dollars per share)	12.68	7.06
Exercised (in dollars per share)	4.69	1.24
Cancelled (in dollars per share)	7.19	6.14
Balance (in dollars per share)	7.85	5.73	$ 4.60
Vested and exercisable (in dollars per share)	5.75	4.72
Vested and expected to vest (in dollars per share)	$ 7.69	$ 5.65
Weighted- average remaining contractual term
Outstanding	7 years 26 days	7 years 3 months 18 days	5 years 11 months
Vested and exercisable	5 years 7 months 3 days	5 years 6 months
Vested and expected to vest	6 years 11 months 17 days	6 years 9 months 18 days
Aggregate intrinsic value
Outstanding	$ 439,382	$ 29,728	$ 26,710
Exercised	16,816	7,600
Vested and exercisable	274,883	28,112
Vested and expected to vest	$ 421,047	$ 29,978

Stockholders' Equity - Stock-ba

Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of stock options granted (in dollars per share)	$ 8.16	$ 3.25	$ 4.06
Compensation expense not yet recognized	$ 51.3	$ 23.7
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average recognition period for unrecognized stock-based compensation	2 years 8 months 22 days	2 years 8 months 5 days

Stockholders' Equity - Assumpti

Stockholders' Equity - Assumptions Used to Estimate Equity Awards (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	43.50%	40.70%	57.60%
Risk-free interest rate	2.96%	1.92%	1.14%
Expected term	5 years 3 months 11 days	5 years 7 days	6 years 7 days
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	48.20%	57.10%	62.80%
Risk-free interest rate	3.09%	2.10%	1.93%
Expected term	6 years 29 days	6 years 29 days	6 years 29 days
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%
Expected volatility	48.52%
Risk-free interest rate	2.37%
Expected term	8 months 9 days

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Units (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 30,231	$ 10,858	$ 8,531
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)		686,072
Stock-based compensation expense		$ 8,700
Total unrecognized stock-based compensation		$ 12,300
Weighted-average recognition period for unrecognized stock-based compensation		3 years 6 months 22 days
Restricted Stock Units | January 1, 2011 - December 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)					802,900
Vesting period		6 years
Stock-based compensation expense		$ 6,900
Restricted Stock Units | May 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	230,000
Stock-based compensation expense		$ 400
Service period	4 years

Stockholders' Equity - Restri_2

Stockholders' Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / sharesshares
Outstanding RSUs and RSAs
Balance (in shares)	802,900
Vested (in shares)	(805,893)
Awarded (in shares)	686,072
Cancelled (in shares)	(8,799)
Balance (in shares)	674,280
Vested and and expected to vest (in shares)	532,623
Weighted-average grant date fair value per share
Balance (in dollars per share) | $ / shares	$ 8.65
Awarded (in dollars per share) | $ / shares	16.09
Cancelled (in dollars per share) | $ / shares	31.79
Balance (in dollars per share) | $ / shares	24.75
Vested and expected to vest (in dollars per share) | $ / shares	$ 24.80
Weighted-average remaining contractual term
Balance	1 year 10 months 7 days
Vested and expected to vest	1 year 8 months 24 days
Aggregate intrinsic value
Balance | $	$ 18,752
Vested and expected to vest | $	$ 14,812

Stockholders' Equity - Sales of

Stockholders' Equity - Sales of the Company's Stock (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Excess of purchase price over fair value recognized as compensation expense		$ 30,231	$ 10,858	$ 8,531
Sale of the Company's Common Stock to Entities Affiliated with Existing Investor
Class of Stock [Line Items]
Common stock sold by employees and former employees (in shares)	1.3
Share price of stock sold by employees (in dollars per shares)	$ 13.12
Aggregate purchase price	$ 17,200
Stock Compensation Plan
Class of Stock [Line Items]
Excess of purchase price over fair value recognized as compensation expense	$ 2,200

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ (64,078)	$ (38,547)	$ (40,392)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	37,540	19,500	16,291
Net loss per share, basic and diluted (in dollars per share)	$ (1.71)	$ (1.98)	$ (2.48)

Net Loss Per Share - Potentiall

Net Loss Per Share - Potentially Dilutive Securities Excluded from the Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computation of diluted net loss per share (in shares)	22,755	61,865	48,109
Redeemable convertible preferred stock (on an if-converted basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computation of diluted net loss per share (in shares)	0	41,628	33,446
Stock-options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computation of diluted net loss per share (in shares)	22,013	18,701	13,709
Redeemable convertible preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computation of diluted net loss per share (in shares)	0	618	0
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computation of diluted net loss per share (in shares)	686	803	803
Early exercised options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computation of diluted net loss per share (in shares)	56	115	151

Income Taxes - Loss Before Inco

Income Taxes - Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic	$ (50,133)	$ (31,681)	$ (37,901)
International	(12,795)	(6,879)	(2,360)
Loss before provision for (benefit from) income taxes	$ (62,928)	$ (38,560)	$ (40,261)

Income Taxes - Components of In

Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense
Federal	$ 234	$ 0	$ 0
State	(10)	109	19
Foreign	823	278	170
Total current tax expense	1,047	387	189
Deferred tax expense (benefit)
Federal	317	99	15
State	153	55	1
Foreign	(367)	(554)	(74)
Total deferred tax expense (benefit)	103	(400)	(58)
Total income tax provision (benefit)	$ 1,150	$ (13)	$ 131

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Statutory Rate to Effective Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal tax benefit at statutory rate	$ (13,298)	$ (13,147)	$ (13,733)
State tax	(10)	2,009	20
Foreign rate differential	1,315	2,513	1,125
Non-deductible permanent items	4,129	1,142	693
Stock-based compensation	(1,178)	1,950	2,184
Tax credits	(922)	(1,702)	0
Change in valuation allowance	11,114	(14,653)	9,842
Tax Act-revaluation of deferred taxes	0	21,875	0
Total income tax provision (benefit)	$ 1,150	$ (13)	$ 131

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating losses	$ 50,154	$ 39,970
Accrual and reserves	7,725	7,845
Tax credit carry-forward	8,503	6,683
Stock-based compensation	5,944	3,642
Depreciation and amortization	4,735	2,593
Total deferred tax assets	77,061	60,733
Valuation allowance	(75,436)	(58,748)	$ (59,806)	$ (48,390)
Net deferred tax assets	1,625	1,985
Deferred tax liabilities:
Depreciation and amortization	(3,665)	(3,925)
Net deferred taxes	$ 2,040	$ 1,940

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefit Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits	$ 5,496	$ 0
Gross amount of increases in unrecognized tax benefits for tax positions taken in current year	1,744	1,526
Gross amount of increases in unrecognized tax benefits for tax positions taken in prior period		3,970
Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior period	0
Unrecognized tax benefits	$ 7,240	$ 5,496

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred tax asset, valuation allowance	$ 75,436,000	$ 58,748,000	$ 59,806,000	$ 48,390,000
Unrecognized tax benefits	7,240,000	5,496,000	$ 0
Unrecognized tax benefits recorded as deferred tax asset reduction	7,200,000
Unrecognized tax benefits, income tax penalties and interest accrued	0	0
EZ Hiring Credit
Tax Credit Carryforward [Line Items]
Tax credit carryforward	2,200,000	2,200,000
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	140,600,000	135,900,000
Federal | Research and Development Credit
Tax Credit Carryforward [Line Items]
Tax credit carryforward	7,800,000
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	49,600,000	$ 46,000,000
State | Research and Development Credit
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 6,600,000

Income Taxes - Valuation Allowa

Income Taxes - Valuation Allowance Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance, Deferred Tax Asset [Roll Forward]
Balance, beginning of period	$ 58,748	$ 59,806	$ 48,390
Charged to costs and expenses	13,243	0	11,416
Charged to other accounts	3,445	0	0
Deductions	0	(1,058)	0
Balance, end of period	$ 75,436	$ 58,748	$ 59,806

Geographic Information (Details

Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 291,611	$ 201,597	$ 133,499
United States
Segment Reporting Information [Line Items]
Net revenue	211,705	141,118	97,454
International
Segment Reporting Information [Line Items]
Net revenue	$ 79,906	$ 60,479	$ 36,045