Eventbrite (EB) 10-Q 1 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 15, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Registrant Name	Eventbrite, Inc.
Entity Central Index Key	0001475115
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	false
Current Fiscal Year End Date	--12-31
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		36,241,811
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		44,414,919

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 533,363	$ 437,892
Funds receivable	54,395	58,697
Accounts receivable, net	5,174	4,069
Creator signing fees, net	8,068	7,324
Creator advances, net	24,124	21,255
Prepaid expenses and other current assets	15,768	16,467
Total current assets	640,892	545,704
Property, plant and equipment, net	45,024	44,219
Goodwill	170,560	170,560
Acquired intangible assets, net	57,174	59,973
Restricted cash	510	1,508
Creator signing fees, noncurrent	11,052	9,681
Creator advances, noncurrent	2,610	1,887
Other assets	3,183	3,352
Total assets	931,005	836,884
Current liabilities
Accounts payable, creators	353,389	272,201
Accounts payable, trade	1,783	1,028
Accrued compensation and benefits	7,157	5,586
Accrued taxes	6,697	8,028
Current portion of term loan	8,017	5,635
Other accrued liabilities	17,179	15,726
Total current liabilities	394,222	308,204
Build-to-suit lease financing obligation	28,225	28,510
Accrued taxes, noncurrent	15,544	15,691
Term loan	65,733	67,087
Other liabilities	2,368	2,170
Total liabilities	506,092	421,662
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.00001 par value; 100,000,000 shares authorized, no shares issued or outstanding as of March 31, 2019 and December 31, 2018	0	0
Common stock, $0.00001 par value; 1,100,000,000 shares authorized, 80,435,123 shares issued and outstanding as of March 31, 2019; 1,100,000,000 shares authorized, 78,546,874 shares issued and 78,358,394 shares outstanding as of December 31, 2018	0	0
Treasury stock, at cost; no shares as of March 31, 2019 and 188,480 shares as of December 31, 2018	0	(488)
Additional paid-in capital	738,206	718,405
Accumulated deficit	(313,293)	(302,695)
Total stockholders’ equity	424,913	415,222
Total liabilities and stockholders’ equity	$ 931,005	$ 836,884

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
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	1,100,000,000
Common stock, shares issued (in shares)	80,435,123	78,546,874
Common stock, shares outstanding (in shares)	80,435,123	78,358,394
Treasury stock (in shares)	0	188,480

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net revenue		$ 81,326,000	$ 74,526,000
Cost of net revenue	[1]	30,518,000	28,084,000
Gross profit		50,808,000	46,442,000
Operating expenses:
Product development	[1]	14,264,000	8,834,000
Sales, marketing and support	[1]	21,170,000	20,472,000
General and administrative	[1]	25,519,000	20,227,000
Total operating expenses	[1]	60,953,000	49,533,000
Loss from operations	[1]	(10,145,000)	(3,091,000)
Interest expense		(1,933,000)	(2,909,000)
Change in fair value of redeemable convertible preferred stock warrant liability		0	(1,321,000)
Gain on debt extinguishment		0	16,995,000
Other income (expense), net		2,180,000	(281,000)
Income (loss) before provision for income taxes		(9,898,000)	9,393,000
Income tax provision		100,000	370,000
Net income (loss)		(9,998,000)	9,023,000
Net income attributable to participating securities, basic		0	9,023,000
Net income attributable to participating securities, diluted		0	9,023,000
Net loss attributable to common stockholders, basic		(9,998,000)	0
Net loss attributable to common stockholders, diluted		$ (9,998,000)	$ 0
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)		$ (0.13)	$ 0
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted (in shares)		78,670	20,711
Cost of net revenue
Operating expenses:
Stock-based compensation expense		$ 244,000	$ 53,000
Product development
Operating expenses:
Stock-based compensation expense		2,038,000	601,000
Sales, marketing and support
Operating expenses:
Stock-based compensation expense		1,223,000	714,000
General and administrative
Operating expenses:
Stock-based compensation expense		$ 4,622,000	$ 1,492,000
[1]	(1) Includes stock-based compensation as follows: Three Months Ended March 31, 2019 2018Cost of net revenue$244 $53Product development2,038 601Sales, marketing and support1,223 714General and administrative4,622 1,492

Consolidated Statements of Rede

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Common StockClass A Common Stock	Common StockClass B Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit
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
Stockholders' equity, balance (in shares) at Dec. 31, 2017		0	20,773,441	188,480
Stockholders' equity, balance at Dec. 31, 2017	(155,814)	$ 0	$ 0	$ (488)	$ 83,291	$ (238,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			124,258
Issuance of common stock upon exercise of stock options	588				588
Vesting of early exercised stock options	92				92
Stock-based compensation	3,016				3,016
Net income (loss)	$ 9,023					9,023
Redeemable convertible preferred stock, balance (in shares) at Mar. 31, 2018	41,628,207
Redeemable convertible preferred stock, balance at Mar. 31, 2018	$ 334,018
Stockholders' equity, balance (in shares) at Mar. 31, 2018			20,897,699	(188,480)
Stockholders' equity, balance at Mar. 31, 2018	(143,095)			$ (488)	86,987	(229,594)
Stockholders' equity, balance (in shares) at Dec. 31, 2018		11,502,993	66,855,401	188,480
Stockholders' equity, balance at Dec. 31, 2018	$ 415,222	$ 0	$ 0	$ (488)	718,405	(302,695)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	2,034,313	1,785,106	249,207
Issuance of common stock upon exercise of stock options	$ 12,427				12,427
Issuance of restricted stock awards (in shares)		4,402
Issuance of common stock for settlement of RSUs (in shares)	62,263
Shares withheld related to net share settlement (in shares)	(24,249)
Shares withheld related to net share settlement	$ (560)				(560)
Conversion of common stock from Class B to Class A (in shares)	(21,095,075)	21,095,075
Conversion of common stock from Class B to Class A	$ 0
Retirement of treasury stock (in shares)				188,480
Retirement of treasury stock				$ 488	(488)
Vesting of early exercised stock options	92				92
Stock-based compensation	8,330				8,330
Net income (loss)	(9,998)					(9,998)
Stockholders' equity, balance (in shares) at Mar. 31, 2019		34,425,590	46,009,533	0
Stockholders' equity, balance at Mar. 31, 2019	$ 424,913	$ 0	$ 0	$ 0	$ 738,206	$ (313,293)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income (loss)	$ (9,998,000)	$ 9,023,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	6,137,000	8,202,000
Amortization of creator signing fees	2,393,000	1,364,000
Accretion of debt issuance costs	104,000	530,000
Gain on debt extinguishment	0	(16,995,000)
Change in fair value of redeemable convertible preferred stock warrant liability	0	1,321,000
Stock-based compensation	8,127,000	2,860,000
Impairment of creator advances and creator signing fees	463,000	378,000
Provision for bad debt and creator advances	580,000	619,000
Loss on disposal of equipment	22,000	1,000
Deferred income taxes	(174,000)	276,000
Changes in operating assets and liabilities:
Accounts receivable	(1,507,000)	(1,024,000)
Funds receivable	4,302,000	5,886,000
Creator signing fees	(4,621,000)	(3,651,000)
Creator advances	(4,120,000)	(2,547,000)
Prepaid expenses and other current assets	699,000	(1,328,000)
Other assets	117,000	94,000
Accounts payable, creators	81,188,000	72,191,000
Accounts payable, trade	285,000	1,008,000
Accrued compensation and benefits	1,571,000	(516,000)
Accrued taxes	(1,331,000)	1,497,000
Other accrued liabilities	3,617,000	4,644,000
Accrued taxes, noncurrent	27,000	2,493,000
Other liabilities	(1,147,000)	(20,000)
Net cash provided by operating activities	86,734,000	86,306,000
Cash flows from investing activities
Purchases of property and equipment	(1,285,000)	(653,000)
Capitalized internal-use software development costs	(2,105,000)	(2,339,000)
Net cash used in investing activities	(3,390,000)	(2,992,000)
Cash flows from financing activities
Proceeds from exercise of stock options	12,428,000	588,000
Taxes paid related to net share settlement of equity awards	(175,000)	0
Payments of debt issuance costs	(457,000)	0
Proceeds from term loans	0	30,000,000
Principal payments on debt obligations	0	(35,290,000)
Payments on capital lease obligations	(70,000)	(46,000)
Principal payments on lease financing obligation	(184,000)	(124,000)
Payments of deferred offering costs	(413,000)	0
Net cash provided by (used in) financing activities	11,129,000	(4,872,000)
Net increase in cash, cash equivalents and restricted cash	94,473,000	78,442,000
Cash, cash equivalents and restricted cash
Beginning of period	439,400,000	192,221,000
End of period	533,873,000	270,663,000
Supplemental cash flow data
Interest paid	10,000	1,936,000
Income taxes paid, net of refunds	184,000	43,000
Non-cash investing and financing activities
Vesting of early exercised stock options	92,000	92,000
Purchases of property and equipment, accrued but unpaid	572,000	34,000
Issuance of redeemable convertible preferred stock warrants in connection with loan facilities	0	2,713,000
Deferred offering costs, accrued but unpaid	$ 0	$ 57,000

Organization

Organization	3 Months Ended
	Mar. 31, 2019
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.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying interim condensed consolidated financial statements of the Company are unaudited. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and the applicable rules and regulations of the Securities and Exchange Commissions (SEC) for interim financial information. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The condensed consolidated balance sheet as of December 31, 2018 included herein was derived from the audited financial statements as of that date. The accompanying interim unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal and recurring nature considered necessary to state fairly the Company's consolidated financial position, results of operations and cash flows for the interim periods. All intercompany transactions and balances have been eliminated. The interim results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 or for any other future annual or interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with "Management's Discussion and Analysis of Financial Condition and Results of Operations," "Quantitative and Qualitative Disclosures About Market Risk" and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 (2018 Form 10-K). Prior Period Reclassification Beginning in the first quarter of 2019, the Company classified the amortization of acquired customer relationship intangible assets and certain other costs as sales, marketing and support expenses. Previously, these expenses were classified as general and administrative expenses. The Company has reclassified $2.9 million of expenses for the three months ended March 31, 2018 to make the presentation consistent with the current period. There was no change to total operating expenses, loss from operations, income before provision for income taxes or net income for the three months ended March 31, 2018 as a result of these reclassifications. 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 condensed 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, 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 Income (Loss) For all periods presented, comprehensive income (loss) equaled net income (loss). Therefore, the condensed consolidated statements of comprehensive income (loss) have been omitted from the interim unaudited condensed 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 public companies. Recently Adopted Accounting Pronouncements The Company adopted ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business beginning January 1, 2019. This standard 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. The adoption of this standard has had no material impact on the Company's interim condensed consolidated financial statements. In May 2014, and in subsequent updates, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and Other Assets and Deferred Costs—Contracts with Customers (Subtopic 340-40) (ASC Topic 606), which supersedes nearly all existing revenue recognition guidance. ASC Topic 606 establishes a five-step revenue recognition process in which an entity will recognize revenue when or as it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASC Topic 606 also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASC Topic 606 was effective for and adopted by the Company beginning January 1, 2019. The Company applied the modified retrospective approach to contracts which were not completed as of the adoption date. The adoption of ASC Topic 606 primarily had the following impact on the Company's financial statements: ▪ Beginning January 1, 2019, the Company recognizes revenue allocated to its customer service and account management performance obligations over time as the Company has a stand-ready obligation to provide these services to certain customers. The Company recorded a cumulative-effect adjustment to opening accumulated deficit as of January 1, 2019 of $0.6 million and a corresponding increase to contract liabilities, included within other accrued liabilities on the interim condensed consolidated balance sheet. ▪ The adoption of ASC Topic 606 had no material impact to the Company's net revenues recorded in the three months ended March 31, 2019. ▪ The accounting treatment of incremental costs of obtaining contracts under ASC Topic 606 had no material impact to the Company's interim unaudited condensed consolidated financial statements. ▪ The adoption of ASC Topic 606 had no impact to the Company's total net cash provided by or used in operating, investing or financing activities within the Company's interim condensed consolidated statement of cash flows for the three months ended March 31, 2019. Refer to Revenue Recognition below for additional discussion of the Company's revenue recognition policies under ASC Topic 606. Recently Issued Accounting Pronouncements Not Yet Adopted 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 the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. This standard will apply to the Company's reporting requirements in performing goodwill impairment testing, however, the Company does not anticipate the adoption of this standard will have a material impact on its consolidated financial statements. 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 the Company for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. 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. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include bank deposits held by 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 $302.6 million and $217.4 million as of March 31, 2019 and December 31, 2018 , 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 condensed consolidated balance sheets. The Company has issued letters of credit under lease agreements and other agreements which have been collateralized with cash. This cash is classified as restricted cash on the condensed consolidated balance sheets. The following table provides a reconciliation of cash and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same amounts shown in the condensed consolidated statements of cash flows (in thousands): March 31, 2019 December 31, 2018 Cash and cash equivalents $ 533,363 $ 437,892 Restricted cash 510 1,508 Total cash, cash equivalents and restricted cash $ 533,873 $ 439,400 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 $50.8 million and $54.8 million as of March 31, 2019 and December 31, 2018 , respectively. Revenue Recognition The Company determines revenue recognition through the following steps: i. Identification of the contract, or contracts, with a customer ii. Identification of the performance obligations in the contract iii. Determination of the transaction price iv. Allocation of the transaction price to the performance obligations in the contract v. Recognition of revenue when, or as, the Company satisfies a performance obligation The Company derives its revenues primarily from service fees and payment processing fees charged at the time a ticket for an event is sold. The Company also derives revenues from providing certain creators with account management services and customer support. The Company's customers are event creators who are selling tickets for events using the Company's platform. Tickets are sold by creators to attendees. Revenue is recognized when or as control of the promised goods or services is transferred to customers, in an amount that reflects the consideration the Company expects to receive in exchange for those goods or services. The Company allocates the transaction price by estimating a standalone selling price for each performance obligation using an expected cost plus a margin approach. For service fees and payment processing fees, revenue is recognized when the ticket is sold. For account management services and customer support, revenue is recognized over the period from the date of the sale of the ticket to the date of the event. The event 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 event creator. 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 Company evaluates whether it is appropriate to recognize revenue on a gross or net basis based upon its evaluation of whether the Company obtains control of the specified goods or services by considering if it is primarily responsible for fulfillment of the promise, has inventory risk, and has the latitude in establishing pricing and selecting suppliers, among other factors. The Company determined the event creator is the party responsible for fulfilling the promise to the attendee, as the creator is responsible for providing the event for which a ticket is sold, determines the price of the ticket and is 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 the Company's performance obligation is to facilitate and process that transaction and issue the ticket. The amount that the Company earns for its services is fixed. For the payment processing service, the Company determined that it is the principal in providing the service as the Company is responsible for fulfilling the promise to process the payment and has discretion and latitude in establishing the price of its 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. As a result, costs incurred for processing the transactions are included in cost of net revenues in the condensed consolidated statements of operations. 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 creator signing fees is inseparable from the customer relationship with the creator and accordingly these fees are recorded as a reduction of revenue. Significant Accounting Policies Other than as discussed above with respect to the Company's adoption of ASC Topic 606, there have been no material changes to the Company's significant accounting policies as described in the Company's 2018 Form 10-K.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurement 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 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 March 31, 2019 and December 31, 2018 . The Company measures the redeemable convertible preferred stock warrant liability at fair value on a recurring basis and determined this is a Level 3 financial liability in the fair value hierarchy. Refer to Note 10 for further discussion. 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 (primarily the 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. 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 between levels of the fair value hierarchy of its financial assets or liabilities measured at fair value during the year ended December 31, 2018 or the three months ended March 31, 2019.

Accounts Receivable, Net

Accounts Receivable, Net	3 Months Ended
	Mar. 31, 2019
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 balances as of the dates indicated (in thousands): March 31, 2019 December 31, 2018 Accounts receivable, customers $ 7,150 $ 5,651 Allowance for doubtful accounts (1,976 ) (1,582 ) Accounts receivable, net $ 5,174 $ 4,069

Creator Signing Fees, Net

Creator Signing Fees, Net	3 Months Ended
	Mar. 31, 2019
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. Amortization of creator signing fees is recorded as a reduction of revenue in the condensed consolidated statements of operations. As of March 31, 2019 , these payments are being amortized over a weighted-average remaining contract life of 3.4 years on a straight-line basis. Creator signing fees that are expected to be amortized within 12 months of the balance sheet date are classified as creator signing fees, net and the remainder is classified as noncurrent on the condensed consolidated balance sheets. The following table summarizes the activity in creator signing fees for the periods indicated (in thousands): Three Months Ended March 31, 2019 Year Ended December 31, 2018 Balance, beginning of period $ 17,005 $ 10,421 Creator signing fees paid 4,558 15,973 Amortization of creator signing fees (2,393 ) (7,086 ) Write-offs and other adjustments (50 ) (2,303 ) Balance, end of period $ 19,120 $ 17,005 Creator signing fees, net $ 8,068 $ 7,324 Creator signing fees, noncurrent 11,052 9,681

Creator Advances, Net

Creator Advances, Net	3 Months Ended
	Mar. 31, 2019
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. Creator advances that are expected to be recovered within 12 months of the balance sheet date are classified as creator advances, net and the remainder is classified as noncurrent on the condensed consolidated balance sheets. The following table summarizes the activity in creator advances for the periods indicated (in thousands): Three Months Ended March 31, 2019 Year Ended December 31, 2018 Balance, beginning of period $ 23,142 $ 20,076 Acquired with Ticketea transaction — 532 Creator advances paid 9,768 21,466 Creator advances recouped (5,749 ) (16,158 ) Write-offs and other adjustments (427 ) (2,774 ) Balance, end of period $ 26,734 $ 23,142 Creator advances, net $ 24,124 $ 21,255 Creator advances, noncurrent 2,610 1,887

Property, Plant and Equipment,

Property, Plant and Equipment, Net	3 Months Ended
	Mar. 31, 2019
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): March 31, 2019 December 31, 2018 Building and improvements $ 33,277 $ 33,277 Capitalized internal-use software development costs 37,509 35,201 Furniture and fixtures 4,742 3,557 Computers and computer equipment 11,806 11,676 Leasehold improvements 5,596 5,084 92,930 88,795 Less: Accumulated depreciation and amortization (47,906 ) (44,576 ) Property, plant and equipment, net $ 45,024 $ 44,219 The Company recorded the following amounts related to depreciation expense and capitalized internal-use software development costs during the periods indicated (in thousands): Three Months Ended 2019 2018 Depreciation expense $ 1,637 $ 1,142 Capitalized internal-use software development costs 2,308 2,495 Stock-based compensation costs included in capitalized internal-use software development costs 203 156 Amortization of capitalized internal-use software development costs 1,701 1,477

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets, Net	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets, Net	Goodwill and Acquired Intangible Assets, Net The carrying value of goodwill was $170.6 million as of December 31, 2018 and March 31, 2019. Acquired intangible assets, net consisted of the following as of the dates indicated (in thousands): March 31, 2019 Cost Accumulated Net Book Weighted- Developed technology $ 19,096 $ 18,857 $ 239 0.8 Customer relationships 74,484 17,549 56,935 5.9 Tradenames 1,600 1,600 — Acquired intangible assets, net $ 95,180 $ 38,006 $ 57,174 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 — Acquired intangible assets, net $ 95,180 $ 35,207 $ 59,973 The Company recorded amortization expense related to acquired intangible assets in the condensed consolidated statements of operations as follows for the periods indicated (in thousands): Three Months Ended 2019 2018 Cost of net revenue $ 229 $ 2,872 Sales, marketing and support 2,571 2,434 General and administrative — 275 Total amortization of acquired intangible assets $ 2,800 $ 5,581 As of March 31, 2019 , the total expected future amortization expense for acquired intangible assets is as follows (in thousands): Remainder of 2019 $ 8,026 2020 10,443 2021 10,197 2022 8,202 2023 7,709 Thereafter 12,597 Total $ 57,174

Redeemable Convertible Preferre

Redeemable Convertible Preferred Stock Warrants	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Redeemable Convertible Preferred Stock Warrants	Redeemable Convertible Preferred Stock Warrants In connection with the WTI Loan Facilities discussed in Note 9, the Company issued warrants to WTI to purchase shares of our Series G redeemable convertible preferred stock. The redeemable convertible 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, in connection with the execution of the Second WTI Loan Facility, 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 the Company's 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. The Company recorded a $1.3 million increase in the fair value of the redeemable convertible preferred stock warrant liability during the three months ended March 31, 2018. There was no activity during the three months ended March 31, 2019. Refer to Note 3 for discussion of the significant inputs used to determine the fair value of the redeemable convertible preferred stock warrant liability.

Term Loans and Debt

Term Loans and Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Term Loans and Debt	Term Loans and Promissory Note Term Loans 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. 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. As of December 31, 2018, there were no amounts outstanding under the WTI Loan Facilities and all underlying agreements had 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 New Term Loans amortize at a rate of 7.5% per annum for the first two years of the New Credit Facilities, 10% 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. The Company has made no draw on the New Revolving Credit Facility as of March 31, 2019. All outstanding amounts under the New Credit Facilities bear interest, at the Company's option, 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 5.11% as of March 31, 2019. 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. As of March 31, 2019, the Company was in compliance with all financial covenants. Term loans consisted of the following as of the dates indicated (in thousands): March 31, 2019 December 31, 2018 Outstanding principal balance $ 73,594 $ 73,584 Accrued but unpaid interest 986 10 Less: Unamortized discount and debt issuance costs (830 ) (872 ) Total term loan $ 73,750 $ 72,722 Current portion of term loan $ 8,017 $ 5,635 Term loan 65,733 67,087 As of March 31, 2019 , the contractual principal payments due for the New Term Loans for the next five years are as follows (in thousands): Remainder of 2019 $ 5,625 2020 5,156 2021 7,500 2022 7,500 2023 47,813 Total $ 73,594 Promissory Note 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. 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 condensed consolidated statements of operations for the three months ended March 31, 2018.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
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 $1.0 million and $0.6 million for the three months ended March 31, 2019 and 2018 , respectively. The Company also recognized sublease income of $1.0 million and $0.7 million during the three months ended March 31, 2019 and 2018 , 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 building asset and lease financing obligation. Land lease expense was $0.2 million for each of the three months ended March 31, 2019 and 2018 . Interest expense related to the Company's build-to-suit lease was $0.8 million and $0.9 million for the three months ended March 31, 2019 and 2018 , respectively. As of March 31, 2019 , the future minimum lease payments and sublease rental payments under noncancelable leases are as follows (in thousands): Capital Leases Build-to-Suit Operating Sublease Total Remainder of 2019 $ 190 $ 4,230 $ 2,839 $ (3,082 ) $ 4,177 2020 403 5,772 3,872 (4,205 ) 5,842 2021 — 1,943 3,444 (1,239 ) 4,148 2022 — — 3,164 — 3,164 2023 — — 2,818 — 2,818 Thereafter — — 4,367 — 4,367 Total minimum lease payments 593 11,945 20,504 (8,526 ) 24,516 Less: Amount representing interest and taxes — (6,723 ) — — (6,723 ) Total $ 593 $ 5,222 $ 20,504 $ (8,526 ) $ 17,793 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 condensed consolidated balance sheets based on the term of the underlying agreements. During the three months ended March 31, 2019 , the Company was released from a letter of credit for $1.0 million related to its leased office space in San Francisco, California. This amount was reclassified to cash and cash equivalents on the condensed consolidated balance sheets as of March 31, 2019. 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 March 31, 2019 (in thousands): Remainder of 2019 $ 7,411 2020 6,426 2021 931 2022 145 2023 74 Thereafter — Total $ 14,987 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. On April 15, 2019, a purported stockholder of the Company filed a class action complaint against the Company, certain officers and members of the Company's board of directors and the underwriters for the Company's IPO. Among other things, the Complaint alleges that defendants misrepresented and/or omitted material information in the Company's IPO registration statement in violation of the Securities Act. The Complaint alleges that the Company and certain officers misrepresented and/or omitted material information in the Company's earnings release and Form 10-Q for the third quarter of 2018. The Complaint seeks compensatory damages, costs and expenses, including attorneys' and expert fees, and other relief. The Company believes that the Complaint is without merit and the Company intends to vigorously defend the action. The Company cannot predict the outcome of or estimate the possible loss or range of loss from the Complaint and therefore no amounts have been accrued for the contingency. The Company currently has no other 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 $17.6 million and $19.2 million as of March 31, 2019 and December 31, 2018, respectively. These amounts, which represent management's best estimates of its potential liability, include potential interest and penalties of $0.8 million and $1.2 million as of March 31, 2019 and December 31, 2018, respectively. 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.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Shareholders' Equity	Stockholders' Equity 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 Option 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 29,963,761 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 Company's 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. In January 2019, the board of directors of the Company approved an additional 3,917,919 shares of Class A common stock to be added to the 2018 Plan, resulting in 11,590,519 shares of Class A common stock reserved for future issuance as of March 31, 2019. The Company has 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 units (RSUs), unrestricted stock awards, dividend equivalent rights and cash-based awards. As of March 31, 2019, there were 19,879,817 cumulative options issued and outstanding and 14,250,977 cumulative shares available for issuance under the 2004 Plan, 2010 Plan and 2018 Plan (collectively, the Plans). Stock options 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 for up to 10 years from the date of grant. Stock option activity under the Plans was as follows for the periods indicated: Outstanding Weighted- Weighted- Aggregate (thousands) Balance as of December 31, 2018 22,012,597 $ 7.85 7.1 $ 439,382 Granted 109,307 31.88 Exercised (2,034,313 ) 6.11 32,468 Cancelled (207,774 ) 9.39 Balance as of March 31, 2019 19,879,817 8.14 6.9 220,792 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 Vested and exercisable as of March 31, 2019 11,477,302 6.01 5.5 151,021 Vested and expected to vest as of March 31, 2019 18,988,789 8.00 6.7 213,636 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 were initially authorized for issuance under the ESPP. Subject to any plan limitations, the 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 Company's 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. The Company recorded $0.3 million of expense during the three months ended March 31, 2019 related to the ESPP. 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. In January 2019, the board of directors approved an additional 783,583 of Class A common stock for a total of 2,318,083 reserved for issuance under the ESPP. Common Stock Subject to Repurchase The Plans and the Company's stock option agreement allow for the early exercise of stock options for certain individuals, as determined by the Company's 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 March 31, 2019 and December 31, 2018 , outstanding common stock included 43,638 and 55,537 shares, respectively, subject to repurchase related to unvested stock options that have been early exercised. The Company has a liability of $0.3 million and $0.4 million as of March 31, 2019 and December 31, 2018 , 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 as expense 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 during the periods indicated: Three Months Ended 2019 2018 Expected dividend yield — — Expected volatility 49.7% 48.3% Risk-free interest rate 2.58% 2.25 - 2.38% Expected term (years) 6.08 6.08 The weighted-average fair value of stock options granted was $16.01 and $ 4.21 for the three months ended March 31, 2019 and 2018, respectively. As of March 31, 2019 and December 31, 2018 , the total unrecognized stock-based compensation related to unvested options outstanding was $47.4 million and $51.3 million , respectively, to be recognized over a weighted-average period of 2.55 years and 2.73 years , respectively. Restricted Stock Units RSU activity under the Plans was as follows for the periods indicated: Outstanding RSUs Weighted-average grant date fair value per share Weighted-average remaining contractual term (years) Aggregate intrinsic value (thousands) Balance as of December 31, 2018 670,606 $ 24.71 1.9 $ 18,650 Net shares settled upon vesting (39,923 ) Awarded 673,725 30.55 Cancelled (19,061 ) 31.89 Balance as of March 31, 2019 1,285,347 28.05 1.9 24,212 Vested and expected to vest as of March 31, 2019 1,016,856 27.73 1.7 19,493 The Company recognized $2.3 million of stock-based compensation expense related to RSUs during the three months ended March 31, 2019, and as of that date, the total unrecognized stock-based compensation related to RSUs outstanding was $25.8 million , to be recognized over a weighted-average period of 3.58 years . The Company recognized no expense related to RSUs during the three months ended March 31, 2018.

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share Basic net loss per share 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 is computed by giving effect to all potentially dilutive securities outstanding for the period. In periods of net loss, basic net loss per share and diluted net loss per share are equal as including the potentially dilutive securities has an anti-dilutive effect. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): Three Months Ended 2019 2018 Net income (loss) $ (9,998 ) $ 9,023 Net income attributable to participating securities — 9,023 Net loss attributable to common stockholders $ (9,998 ) $ — Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 78,670 20,711 Net loss per share attributable to common stockholders, basic and diluted $ (0.13 ) $ — The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders because including them would have had an anti-dilutive effect (in thousands): Three Months Ended March 31, 2019 2018 Redeemable convertible preferred stock (on an if-converted basis) — 41,628 Options to purchase common stock 19,880 18,690 Redeemable convertible preferred stock warrants — 824 Restricted stock units 1,285 803 Early exercised stock options 44 91 Total 21,209 62,036

Income Taxes Income Taxes

Income Taxes Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded income tax expense of $0.1 million for the three months ended March 31, 2019 compared to $0.4 million for the three months ended March 31, 2018. The decrease was attributable to the changes in the Company's taxable earnings mix. The differences in the tax provision for the periods presented and the U.S. federal statutory rate is primarily due to foreign taxes in profitable jurisdictions and the recording of a full valuation allowance on our net deferred tax assets and certain foreign losses which benefit from rates lower than the U.S. federal statutory rate. The Company applies the discrete method provided in ASC 740 to calculate its interim tax provision.

Geographic Information

Geographic Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Geographic Information	Geographic Information The Company operates as a single reportable and operating segment. The following table presents the Company's total net revenue by geography based on the currency of the underlying transaction for the periods indicated (in thousands): Three Months Ended 2019 2018 United States $ 59,780 $ 55,815 International 21,546 18,711 Total net revenue $ 81,326 $ 74,526 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.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	The accompanying interim condensed consolidated financial statements of the Company are unaudited. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and the applicable rules and regulations of the Securities and Exchange Commissions (SEC) for interim financial information. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The condensed consolidated balance sheet as of December 31, 2018 included herein was derived from the audited financial statements as of that date. The accompanying interim unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal and recurring nature considered necessary to state fairly the Company's consolidated financial position, results of operations and cash flows for the interim periods. All intercompany transactions and balances have been eliminated. The interim results for the three months ended March 31, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 or for any other future annual or interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with "Management's Discussion and Analysis of Financial Condition and Results of Operations," "Quantitative and Qualitative Disclosures About Market Risk" and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 (2018 Form 10-K).
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 condensed 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, 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 Income (Loss)	For all periods presented, comprehensive income (loss) equaled net income (loss). Therefore, the condensed consolidated statements of comprehensive income (loss) have been omitted from the interim unaudited condensed 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 public companies.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements	The Company adopted ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business beginning January 1, 2019. This standard 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. The adoption of this standard has had no material impact on the Company's interim condensed consolidated financial statements. In May 2014, and in subsequent updates, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) and Other Assets and Deferred Costs—Contracts with Customers (Subtopic 340-40) (ASC Topic 606), which supersedes nearly all existing revenue recognition guidance. ASC Topic 606 establishes a five-step revenue recognition process in which an entity will recognize revenue when or as it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASC Topic 606 also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASC Topic 606 was effective for and adopted by the Company beginning January 1, 2019. The Company applied the modified retrospective approach to contracts which were not completed as of the adoption date. The adoption of ASC Topic 606 primarily had the following impact on the Company's financial statements: ▪ Beginning January 1, 2019, the Company recognizes revenue allocated to its customer service and account management performance obligations over time as the Company has a stand-ready obligation to provide these services to certain customers. The Company recorded a cumulative-effect adjustment to opening accumulated deficit as of January 1, 2019 of $0.6 million and a corresponding increase to contract liabilities, included within other accrued liabilities on the interim condensed consolidated balance sheet. ▪ The adoption of ASC Topic 606 had no material impact to the Company's net revenues recorded in the three months ended March 31, 2019. ▪ The accounting treatment of incremental costs of obtaining contracts under ASC Topic 606 had no material impact to the Company's interim unaudited condensed consolidated financial statements. ▪ The adoption of ASC Topic 606 had no impact to the Company's total net cash provided by or used in operating, investing or financing activities within the Company's interim condensed consolidated statement of cash flows for the three months ended March 31, 2019. Refer to Revenue Recognition below for additional discussion of the Company's revenue recognition policies under ASC Topic 606. 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 the annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. This standard will apply to the Company's reporting requirements in performing goodwill impairment testing, however, the Company does not anticipate the adoption of this standard will have a material impact on its consolidated financial statements. 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 the Company for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. 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.
Cash, Cash Equivalents and Restricted Cash	Cash and cash equivalents include bank deposits held by 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 $302.6 million and $217.4 million as of March 31, 2019 and December 31, 2018 , 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 condensed consolidated balance sheets. The Company has issued letters of credit under lease agreements and other agreements which have been collateralized with cash. This cash is classified as restricted cash on the condensed consolidated balance sheets.
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.
Revenue Recognition	The Company determines revenue recognition through the following steps: i. Identification of the contract, or contracts, with a customer ii. Identification of the performance obligations in the contract iii. Determination of the transaction price iv. Allocation of the transaction price to the performance obligations in the contract v. Recognition of revenue when, or as, the Company satisfies a performance obligation The Company derives its revenues primarily from service fees and payment processing fees charged at the time a ticket for an event is sold. The Company also derives revenues from providing certain creators with account management services and customer support. The Company's customers are event creators who are selling tickets for events using the Company's platform. Tickets are sold by creators to attendees. Revenue is recognized when or as control of the promised goods or services is transferred to customers, in an amount that reflects the consideration the Company expects to receive in exchange for those goods or services. The Company allocates the transaction price by estimating a standalone selling price for each performance obligation using an expected cost plus a margin approach. For service fees and payment processing fees, revenue is recognized when the ticket is sold. For account management services and customer support, revenue is recognized over the period from the date of the sale of the ticket to the date of the event. The event 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 event creator. 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 Company evaluates whether it is appropriate to recognize revenue on a gross or net basis based upon its evaluation of whether the Company obtains control of the specified goods or services by considering if it is primarily responsible for fulfillment of the promise, has inventory risk, and has the latitude in establishing pricing and selecting suppliers, among other factors. The Company determined the event creator is the party responsible for fulfilling the promise to the attendee, as the creator is responsible for providing the event for which a ticket is sold, determines the price of the ticket and is 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 the Company's performance obligation is to facilitate and process that transaction and issue the ticket. The amount that the Company earns for its services is fixed. For the payment processing service, the Company determined that it is the principal in providing the service as the Company is responsible for fulfilling the promise to process the payment and has discretion and latitude in establishing the price of its 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. As a result, costs incurred for processing the transactions are included in cost of net revenues in the condensed consolidated statements of operations. 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 creator signing fees is inseparable from the customer relationship with the creator and accordingly these fees are recorded as a reduction of revenue.
Fair Value Measurement	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 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 March 31, 2019 and December 31, 2018 . The Company measures the redeemable convertible preferred stock warrant liability at fair value on a recurring basis and determined this is a Level 3 financial liability in the fair value hierarchy. Refer to Note 10 for further discussion. 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 (primarily the 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. 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.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Reconciliation of Cash and Restricted Cash	The following table provides a reconciliation of cash and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same amounts shown in the condensed consolidated statements of cash flows (in thousands): March 31, 2019 December 31, 2018 Cash and cash equivalents $ 533,363 $ 437,892 Restricted cash 510 1,508 Total cash, cash equivalents and restricted cash $ 533,873 $ 439,400
Reconciliation of Cash and Restricted Cash	The following table provides a reconciliation of cash and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same amounts shown in the condensed consolidated statements of cash flows (in thousands): March 31, 2019 December 31, 2018 Cash and cash equivalents $ 533,363 $ 437,892 Restricted cash 510 1,508 Total cash, cash equivalents and restricted cash $ 533,873 $ 439,400

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Summary of Accounts Receivable	The following table summarizes the Company's accounts receivable balances as of the dates indicated (in thousands): March 31, 2019 December 31, 2018 Accounts receivable, customers $ 7,150 $ 5,651 Allowance for doubtful accounts (1,976 ) (1,582 ) Accounts receivable, net $ 5,174 $ 4,069 The following table summarizes the activity in creator advances for the periods indicated (in thousands): Three Months Ended March 31, 2019 Year Ended December 31, 2018 Balance, beginning of period $ 23,142 $ 20,076 Acquired with Ticketea transaction — 532 Creator advances paid 9,768 21,466 Creator advances recouped (5,749 ) (16,158 ) Write-offs and other adjustments (427 ) (2,774 ) Balance, end of period $ 26,734 $ 23,142 Creator advances, net $ 24,124 $ 21,255 Creator advances, noncurrent 2,610 1,887

Creator Signing Fees, Net (Tabl

Creator Signing Fees, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Schedule of Creator Signing Fees, Net	The following table summarizes the activity in creator signing fees for the periods indicated (in thousands): Three Months Ended March 31, 2019 Year Ended December 31, 2018 Balance, beginning of period $ 17,005 $ 10,421 Creator signing fees paid 4,558 15,973 Amortization of creator signing fees (2,393 ) (7,086 ) Write-offs and other adjustments (50 ) (2,303 ) Balance, end of period $ 19,120 $ 17,005 Creator signing fees, net $ 8,068 $ 7,324 Creator signing fees, noncurrent 11,052 9,681

Creator Advances, Net (Tables)

Creator Advances, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Summary of Activity in Creator Advances	The following table summarizes the Company's accounts receivable balances as of the dates indicated (in thousands): March 31, 2019 December 31, 2018 Accounts receivable, customers $ 7,150 $ 5,651 Allowance for doubtful accounts (1,976 ) (1,582 ) Accounts receivable, net $ 5,174 $ 4,069 The following table summarizes the activity in creator advances for the periods indicated (in thousands): Three Months Ended March 31, 2019 Year Ended December 31, 2018 Balance, beginning of period $ 23,142 $ 20,076 Acquired with Ticketea transaction — 532 Creator advances paid 9,768 21,466 Creator advances recouped (5,749 ) (16,158 ) Write-offs and other adjustments (427 ) (2,774 ) Balance, end of period $ 26,734 $ 23,142 Creator advances, net $ 24,124 $ 21,255 Creator advances, noncurrent 2,610 1,887

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	Property, plant and equipment, net consisted of the following as of the dates indicated (in thousands): March 31, 2019 December 31, 2018 Building and improvements $ 33,277 $ 33,277 Capitalized internal-use software development costs 37,509 35,201 Furniture and fixtures 4,742 3,557 Computers and computer equipment 11,806 11,676 Leasehold improvements 5,596 5,084 92,930 88,795 Less: Accumulated depreciation and amortization (47,906 ) (44,576 ) Property, plant and equipment, net $ 45,024 $ 44,219
Capitalized Internal-Use Software Development Costs	The Company recorded the following amounts related to depreciation expense and capitalized internal-use software development costs during the periods indicated (in thousands): Three Months Ended 2019 2018 Depreciation expense $ 1,637 $ 1,142 Capitalized internal-use software development costs 2,308 2,495 Stock-based compensation costs included in capitalized internal-use software development costs 203 156 Amortization of capitalized internal-use software development costs 1,701 1,477

Goodwill and Acquired Intangi_2

Goodwill and Acquired Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired Intangible Assets	Acquired intangible assets, net consisted of the following as of the dates indicated (in thousands): March 31, 2019 Cost Accumulated Net Book Weighted- Developed technology $ 19,096 $ 18,857 $ 239 0.8 Customer relationships 74,484 17,549 56,935 5.9 Tradenames 1,600 1,600 — Acquired intangible assets, net $ 95,180 $ 38,006 $ 57,174 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 — 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 in the condensed consolidated statements of operations as follows for the periods indicated (in thousands): Three Months Ended 2019 2018 Cost of net revenue $ 229 $ 2,872 Sales, marketing and support 2,571 2,434 General and administrative — 275 Total amortization of acquired intangible assets $ 2,800 $ 5,581
Total Expected Future Amortization Expense for Acquired Intangible Assets	As of March 31, 2019 , the total expected future amortization expense for acquired intangible assets is as follows (in thousands): Remainder of 2019 $ 8,026 2020 10,443 2021 10,197 2022 8,202 2023 7,709 Thereafter 12,597 Total $ 57,174

Term Loans and Debt (Tables)

Term Loans and Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Term Loans	Term loans consisted of the following as of the dates indicated (in thousands): March 31, 2019 December 31, 2018 Outstanding principal balance $ 73,594 $ 73,584 Accrued but unpaid interest 986 10 Less: Unamortized discount and debt issuance costs (830 ) (872 ) Total term loan $ 73,750 $ 72,722 Current portion of term loan $ 8,017 $ 5,635 Term loan 65,733 67,087
Contractual Principal Payments for the Next Five Years	As of March 31, 2019 , the contractual principal payments due for the New Term Loans for the next five years are as follows (in thousands): Remainder of 2019 $ 5,625 2020 5,156 2021 7,500 2022 7,500 2023 47,813 Total $ 73,594

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments and Sublease Rental Payments under Noncancelable Capital Leases	As of March 31, 2019 , the future minimum lease payments and sublease rental payments under noncancelable leases are as follows (in thousands): Capital Leases Build-to-Suit Operating Sublease Total Remainder of 2019 $ 190 $ 4,230 $ 2,839 $ (3,082 ) $ 4,177 2020 403 5,772 3,872 (4,205 ) 5,842 2021 — 1,943 3,444 (1,239 ) 4,148 2022 — — 3,164 — 3,164 2023 — — 2,818 — 2,818 Thereafter — — 4,367 — 4,367 Total minimum lease payments 593 11,945 20,504 (8,526 ) 24,516 Less: Amount representing interest and taxes — (6,723 ) — — (6,723 ) Total $ 593 $ 5,222 $ 20,504 $ (8,526 ) $ 17,793
Future Minimum Lease Payments and Sublease Rental Payments under Noncancelable Operating Leases	As of March 31, 2019 , the future minimum lease payments and sublease rental payments under noncancelable leases are as follows (in thousands): Capital Leases Build-to-Suit Operating Sublease Total Remainder of 2019 $ 190 $ 4,230 $ 2,839 $ (3,082 ) $ 4,177 2020 403 5,772 3,872 (4,205 ) 5,842 2021 — 1,943 3,444 (1,239 ) 4,148 2022 — — 3,164 — 3,164 2023 — — 2,818 — 2,818 Thereafter — — 4,367 — 4,367 Total minimum lease payments 593 11,945 20,504 (8,526 ) 24,516 Less: Amount representing interest and taxes — (6,723 ) — — (6,723 ) Total $ 593 $ 5,222 $ 20,504 $ (8,526 ) $ 17,793
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 March 31, 2019 (in thousands): Remainder of 2019 $ 7,411 2020 6,426 2021 931 2022 145 2023 74 Thereafter — Total $ 14,987

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of stock option activity	Stock option activity under the Plans was as follows for the periods indicated: Outstanding Weighted- Weighted- Aggregate (thousands) Balance as of December 31, 2018 22,012,597 $ 7.85 7.1 $ 439,382 Granted 109,307 31.88 Exercised (2,034,313 ) 6.11 32,468 Cancelled (207,774 ) 9.39 Balance as of March 31, 2019 19,879,817 8.14 6.9 220,792 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 Vested and exercisable as of March 31, 2019 11,477,302 6.01 5.5 151,021 Vested and expected to vest as of March 31, 2019 18,988,789 8.00 6.7 213,636
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 during the periods indicated: Three Months Ended 2019 2018 Expected dividend yield — — Expected volatility 49.7% 48.3% Risk-free interest rate 2.58% 2.25 - 2.38% Expected term (years) 6.08 6.08
Schedule of nonvested restricted stock unit	RSU activity under the Plans was as follows for the periods indicated: Outstanding RSUs Weighted-average grant date fair value per share Weighted-average remaining contractual term (years) Aggregate intrinsic value (thousands) Balance as of December 31, 2018 670,606 $ 24.71 1.9 $ 18,650 Net shares settled upon vesting (39,923 ) Awarded 673,725 30.55 Cancelled (19,061 ) 31.89 Balance as of March 31, 2019 1,285,347 28.05 1.9 24,212 Vested and expected to vest as of March 31, 2019 1,016,856 27.73 1.7 19,493

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
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): Three Months Ended 2019 2018 Net income (loss) $ (9,998 ) $ 9,023 Net income attributable to participating securities — 9,023 Net loss attributable to common stockholders $ (9,998 ) $ — Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 78,670 20,711 Net loss per share attributable to common stockholders, basic and diluted $ (0.13 ) $ —
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 attributable to common stockholders because including them would have had an anti-dilutive effect (in thousands): Three Months Ended March 31, 2019 2018 Redeemable convertible preferred stock (on an if-converted basis) — 41,628 Options to purchase common stock 19,880 18,690 Redeemable convertible preferred stock warrants — 824 Restricted stock units 1,285 803 Early exercised stock options 44 91 Total 21,209 62,036

Geographic Information (Tables)

Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2019
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 for the periods indicated (in thousands): Three Months Ended 2019 2018 United States $ 59,780 $ 55,815 International 21,546 18,711 Total net revenue $ 81,326 $ 74,526

Organization (Details)

Organization (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Sep. 30, 2018	Mar. 31, 2019
Class of Stock [Line Items]
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 (in shares)		(21,095,075)
Series G Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Outstanding warrants to purchase Series G redeemable preferred stock (in shares)	933,269
IPO
Class of Stock [Line Items]
Offering price (in dollars per share)	$ 23
Aggregate net proceeds	$ 246
Offering costs	$ 5.5
Class A Common Stock | Common Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock in connection with initial public offering (in shares)		21,095,075
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
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

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Cost of sales, marketing and support expenses	[1]	$ 21,170	$ 20,472
General and administrative expenses	[1]	25,519	20,227
Cumulative effect adjustment upon adoption of ASU 2014-09				$ (600)
Cash and restricted cash		$ 533,873	$ 270,663		$ 439,400	$ 192,221
Accounts payable, unremitted ticket sale proceeds, net of fees and taxes		5 days
Funds receivable		$ 54,395			58,697
Tickets Sold on Behalf of Creators
Significant Accounting Policies [Line Items]
Funds receivable		50,800			54,800
Creator Cash
Significant Accounting Policies [Line Items]
Cash and restricted cash		302,600			$ 217,400
Accumulated Deficit
Significant Accounting Policies [Line Items]
Cumulative effect adjustment upon adoption of ASU 2014-09				(600)
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Significant Accounting Policies [Line Items]
Contract liabilities				600
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Accumulated Deficit
Significant Accounting Policies [Line Items]
Cumulative effect adjustment upon adoption of ASU 2014-09				$ (600)
Prior Period Reclassification
Significant Accounting Policies [Line Items]
Cost of sales, marketing and support expenses		2,900
General and administrative expenses		$ (2,900)
[1]	(1) Includes stock-based compensation as follows: Three Months Ended March 31, 2019 2018Cost of net revenue$244 $53Product development2,038 601Sales, marketing and support1,223 714General and administrative4,622 1,492

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Reconciliation of Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 533,363	$ 437,892
Restricted cash	510	1,508
Total cash, cash equivalents and restricted cash	$ 533,873	$ 439,400	$ 270,663	$ 192,221

Accounts Receivable, Net (Detai

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable, customers	$ 7,150	$ 5,651
Allowance for doubtful accounts	(1,976)	(1,582)
Accounts receivable, net	$ 5,174	$ 4,069

Creator Signing Fees, Net (Deta

Creator Signing Fees, Net (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Creator signing fees, amortization period	3 years 5 months 2 days
Activity in creator signing fees:
Balance, beginning of period	$ 17,005	$ 10,421	$ 10,421
Creator signing fees paid	4,558		15,973
Amortization of creator signing fees	(2,393)	$ (1,364)	(7,086)
Write-offs and other adjustments	(50)		(2,303)
Balance, end of period	19,120		17,005
Creator signing fees, net	8,068		7,324
Creator signing fees, noncurrent	$ 11,052		$ 9,681

Creator Advances, Net (Details)

Creator Advances, Net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Activity In Notes, Loans And Financing Receivable [Roll Forward]
Balance, beginning of period	$ 26,734	$ 23,142	$ 26,734	$ 23,142	$ 20,076
Acquired with Ticketea transaction	0	532
Creator advances paid	9,768	21,466
Creator advances recouped	(5,749)	(16,158)
Creator advances paid	(427)	(2,774)
Balance, end of period	$ 26,734	$ 23,142
Creator advances, net			24,124	21,255
Creator advances, noncurrent			$ 2,610	$ 1,887

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 92,930	$ 88,795
Less: Accumulated depreciation and amortization	(47,906)	(44,576)
Property, plant and equipment, net	45,024	44,219
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	37,509	35,201
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,742	3,557
Computers and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,806	11,676
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,596	$ 5,084

Property, Plant and Equipment_4

Property, Plant and Equipment, Net - Capitalized Internal-Use Software Development Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 1,637	$ 1,142
Capitalized internal-use software development costs	2,308	2,495
Stock-based compensation costs included in capitalized internal-use software development costs	203	156
Amortization of capitalized internal-use software development costs	$ 1,701	$ 1,477

Goodwill and Acquired Intangi_3

Goodwill and Acquired Intangible Assets, Net - Narrative (Details) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying value of goodwill	$ 170,560	$ 170,560

Goodwill and Acquired Intangi_4

Goodwill and Acquired Intangible Assets, Net - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Acquired intangible assets, net:
Cost	$ 95,180	$ 95,180
Accumulated Amortization	38,006	35,207
Total	57,174	59,973
Developed technology
Acquired intangible assets, net:
Cost	19,096	19,096
Accumulated Amortization	18,857	18,628
Total	$ 239	$ 468
Weighted- average remaining useful life (years)	9 months 25 days	287 days
Customer relationships
Acquired intangible assets, net:
Cost	$ 74,484	$ 74,484
Accumulated Amortization	17,549	14,979
Total	$ 56,935	$ 59,505
Weighted- average remaining useful life (years)	5 years 10 months 25 days	2249 days
Tradenames
Acquired intangible assets, net:
Cost	$ 1,600	$ 1,600
Accumulated Amortization	1,600	1,600
Total	$ 0	$ 0

Goodwill and Acquired Intangi_5

Goodwill and Acquired Intangible Assets, Net - Amortization Expense Related to Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 2,800	$ 5,581
Cost of net revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	229	2,872
Sales, marketing and support
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	2,571	2,434
General and administrative
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 0	$ 275

Goodwill and Acquired Intangi_6

Goodwill and Acquired Intangible Assets, Net - Total Expected Future Amortization Expense for Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
The remainder of 2019	$ 8,026
2020	10,443
2021	10,197
2022	8,202
2023	7,709
Thereafter	12,597
Total	$ 57,174	$ 59,973

Redeemable Convertible Prefer_2

Redeemable Convertible Preferred Stock Warrants (Details) - USD ($)	1 Months Ended			3 Months Ended
	May 31, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2017
Class of Warrant or Right [Line Items]
Proceeds from term loans				$ 0	$ 30,000,000
Exercise price of Series G redeemable convertible preferred stock warrants (in dollars per share)	$ 16.3836
Expiration period	10 years
Change in fair value of redeemable convertible preferred stock warrant liability				$ 0	$ 1,321,000
Line of Credit | Term Loan | First Loan Facility Due September 2022
Class of Warrant or Right [Line Items]
Proceeds from term loans		$ 30,000,000
Line of Credit | Term Loan | First Loan Facility Due February 2022
Class of Warrant or Right [Line Items]
Proceeds from term loans			$ 30,000,000
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			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

Term Loans and Debt - Narrative

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

1 Months Ended

3 Months Ended

Sep. 30, 2018

May 31, 2018

Mar. 31, 2018

Sep. 30, 2017

Mar. 31, 2019

Mar. 31, 2018

Sep. 30, 2022

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2019

Dec. 31, 2018

Jun. 30, 2017

Line of Credit Facility [Line Items]

Proceeds from term loans

$ 0

$ 30,000,000

Long-term debt

73,750,000

$ 72,722,000

Gain (loss) on extinguishment of debt

$ 0

$ 16,995,000

Ticketfly, LLC

Line of Credit Facility [Line Items]

Percentage of interests acquired

100.00%

Consideration transferred

$ 201,100,000

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

Line of Credit Facility [Line Items]

Long-term debt

$ 0

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%

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%

11.75%

Effective interest rate

14.80%

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 | Seecond WTI 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

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

5.11%

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

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%

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

Line of Credit Facility [Line Items]

Basis spread on variable rate

2.25%

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

Line of Credit Facility [Line Items]

Basis spread on variable rate

2.75%

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

Line of Credit Facility [Line Items]

Basis spread on variable rate

1.25%

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

Line of Credit Facility [Line Items]

Basis spread on variable rate

1.75%

Convertible Notes Payable | Promissory Note

Line of Credit Facility [Line Items]

Annual interest rate

6.50%

Payments to acquire businesses

$ 151,100,000

Consideration transferred liabilities incurred

$ 50,000,000

Notes Payable | Promissory Note

Line of Credit Facility [Line Items]

Aggregate principal amount

$ 50,000,000

$ 50,000,000

Amount of debt settled

34,700,000

Amount of debt settled representing principal

33,000,000

Amount of debt settled representing accrued interest

1,700,000

Gain (loss) on extinguishment of debt

$ 17,000,000

Term Loans and Debt - Term Loan

Term Loans and Debt - Term Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Outstanding principal balance	$ 73,594	$ 73,584
Accrued but unpaid interest	986	10
Less: Unamortized discount and debt issuance costs	(830)	(872)
Total term loan, net	73,750	72,722
Current portion of term loan	8,017	5,635
Term loan	$ 65,733	$ 67,087

Term Loans and Debt - Contractu

Term Loans and Debt - Contractual Principal Payments for the Next Five Years (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total term loan, net	$ 73,594	$ 73,584
Senior Secured Credit Facility | Line of Credit | Term Loan
Debt Instrument [Line Items]
Remainder of 2019	5,625
2020	5,156
2021	7,500
2022	7,500
2023	47,813
Total term loan, net	$ 73,594

Commitments and Contingencies -

Commitments and Contingencies - Operating Leases and Build-to-Suit Lease (Details) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2013USD ($)ft²	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)
Capital Leased Assets [Line Items]
Rent expense from operating leases		$ 1	$ 0.6
Sublease income		1	0.7
Area of office space (in square feet) | ft²	97,624
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		0.2	0.2
Interest expense related to build-to-suit lease		$ 0.8	$ 0.9
Building
Capital Leased Assets [Line Items]
Estimated useful life		30 years

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments and Sublease Rental Payments under Noncancelable Operating Leases (Details) $ in Thousands	Mar. 31, 2019USD ($)
Capital Leases
Remainder of 2019	$ 190
2020	403
2021	0
2022	0
2023	0
Thereafter	0
Total minimum lease payments	593
Total	593
Build-to-Suit Lease
Remainder of 2019	4,230
2020	5,772
2021	1,943
2022	0
2023	0
Thereafter	0
Total minimum lease payments	11,945
Less: Amount representing interest and taxes	(6,723)
Total	5,222
Operating Leases
Remainder of 2019	2,839
2020	3,872
2021	3,444
2022	3,164
2023	2,818
Thereafter	4,367
Total	20,504
Sublease Income
Remainder of 2019	(3,082)
2020	(4,205)
2021	(1,239)
2022	0
2023	0
Thereafter	0
Total	(8,526)
Total
Remainder of 2019	4,177
2020	5,842
2021	4,148
2022	3,164
2023	2,818
Thereafter	4,367
Total minimum lease payments	24,516
Total	$ 17,793

Commitments and Contingencies_3

Commitments and Contingencies - Letters of Credit (Details) $ in Millions	Mar. 31, 2019USD ($)
San Francisco Office Space Leases
Line of Credit Facility [Line Items]
Collateralizing letter of credit amount	$ 1

Commitments and Contingencies_4

Commitments and Contingencies - Future Creator Payments Committed to under Contract but Not Yet Paid (Details) - Future Creator Payments $ in Thousands	Mar. 31, 2019USD ($)
Other Commitments [Line Items]
Remainder of 2019	$ 7,411
2020	6,426
2021	931
2022	145
2023	74
Thereafter	0
Total	$ 14,987

Commitments and Contingencies_5

Commitments and Contingencies - Litigation and Loss Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual	$ 17.6	$ 19.2
Estimate of possible loss attributable to potential interest and penalties	$ 0.8	$ 1.2

Stockholders' Equity - Common S

Stockholders' Equity - Common Stock (Details) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2019shares	Aug. 31, 2018shares	Mar. 31, 2019USD ($)voteshares	Dec. 31, 2018shares	Jan. 01, 2019shares	Dec. 31, 2010shares	Dec. 31, 2004shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued and outstanding (in shares)			19,879,817	22,012,597
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of votes per share | vote			1
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of votes per share | vote			10
2004 Plan, 2010 Plan and 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued and outstanding (in shares)			19,879,817
Number of shares available for grant (in shares)			14,250,977
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)						29,963,761
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)			11,590,519
Additional shares of stock added to plan (in shares)	3,917,919
2018 Employee Stock Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution to ESPP		15.00%
Purchase price of common stock under ESPP as a percent of fair market value		85.00%
Stock-based compensation expense | $			$ 0.3
2018 Employee Stock Purchase Plan | Employee Stock | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)					2,318,083
Additional shares of stock added to plan (in shares)	783,583
Cumulative annual increase in shares available for issuance (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]
Cumulative annual increase in shares available for issuance				1.00%

Stockholders' Equity - Common_2

Stockholders' Equity - Common Stock Subject to Repurchase (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Common stock subject to repurchase related to stock options (in shares)	43,638	55,537
Liability related to early exercises of stock options	$ 0.3	$ 0.4

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Outstanding options
Balance (in shares)	22,012,597
Granted (in shares)	109,307
Exercised (in shares)	(2,034,313)
Cancelled (in shares)	(207,774)
Balance (in shares)	19,879,817	22,012,597
Vested and exercisable (in shares)	11,477,302	12,462,693
Vested and expected to vest (in shares)	18,988,789	20,926,797
Weighted- average exercise price
Balance (in dollars per share)	$ 7.85
Granted (in dollars per share)	31.88
Exercised (in dollars per share)	6.11
Cancelled (in dollars per share)	9.39
Balance (in dollars per share)	8.14	$ 7.85
Vested and exercisable (in dollars per share)	6.01	5.75
Vested and expected to vest (in dollars per share)	$ 8	$ 7.69
Weighted- average remaining contractual term
Outstanding	6 years 10 months 26 days	7 years 26 days
Vested and exercisable	5 years 5 months 20 days	5 years 7 months 3 days
Vested and expected to vest	6 years 8 months 22 days	6 years 11 months 17 days
Aggregate intrinsic value
Outstanding	$ 220,792	$ 439,382
Exercised	32,468
Vested and exercisable	151,021	274,883
Vested and expected to vest	$ 213,636	$ 421,047

Stockholders' Equity - Stock-ba

Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of stock options granted (in dollars per share)	$ 16.01	$ 4.21
Compensation expense not yet recognized	$ 47.4		$ 51.3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average recognition period for unrecognized stock-based compensation	2 years 6 months 20 days		2 years 8 months 22 days

Stockholders' Equity - Assumpti

Stockholders' Equity - Assumptions Used to Estimate the Fair Value of Stock Options (Details) - Stock Options	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Expected volatility	49.70%	48.30%
Risk-free interest rate		2.58%
Risk-free interest rate, minimum		2.25%
Risk-free interest rate, maximum		2.38%
Expected term	6 years 30 days	6 years 29 days

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Outstanding RSUs
Balance at December 31, 2018 (in shares)	670,606
Vested (in shares)	(39,923)
Awarded (in shares)	673,725
Cancelled (in shares)	(19,061)
Balance at March 31, 2019 (in shares)	1,285,347	670,606
Vested and expected to vest (in shares)	1,016,856
Weighted-average grant date fair value per share
Balance at December 31, 2018 (in dollars per share)	$ 24.71
Awarded (in dollars per share)	30.55
Cancelled (in dollars per share)	31.89
Balance at March 31, 2019 (in dollars per share)	28.05	$ 24.71
Vested and expected to vest (in dollars per share)	$ 27.73
Weighted-average remaining contractual term
Balance	1 year 10 months 18 days	1 year 10 months 7 days
Vested and expected to vest	1 year 8 months 28 days
Aggregate intrinsic value
Balance	$ 24,212	$ 18,650
Vested and expected to vest	$ 19,493

Stockholders' Equity - Restri_2

Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,300,000	$ 0
Compensation expense not yet recognized	$ 25,800,000
Weighted-average recognition period for unrecognized stock-based compensation	3 years 6 months 29 days

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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ (9,998)	$ 9,023
Net income attributable to participating securities, basic	0	9,023
Net income attributable to participating securities, diluted	0	9,023
Net loss attributable to common stockholders, basic	(9,998)	0
Net loss attributable to common stockholders, diluted	$ (9,998)	$ 0
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	78,670	20,711
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.13)	$ 0

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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
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)	21,209	62,036
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
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)	19,880	18,690
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	824
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)	1,285	803
Early exercised stock 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)	44	91

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 100	$ 370

Geographic Information - Net Re

Geographic Information - Net Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 81,326	$ 74,526
United States
Segment Reporting Information [Line Items]
Net revenue	59,780	55,815
International
Segment Reporting Information [Line Items]
Net revenue	$ 21,546	$ 18,711

Geographic Information - Narrat

Geographic Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2019segment
Segment Reporting [Abstract]
Number of reportable segments	1
Number of operating segments	1