Tableau Software 10-Q 31 Jul 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 29, 2019
Entity Information [Line Items]
Entity Registrant Name	TABLEAU SOFTWARE, INC.
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2019
Entity File Number	001-35925
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-0945740
Entity Address, Address Line One	1621 North 34th Street
Entity Address, City or Town	Seattle
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98103
City Area Code	206
Local Phone Number	633-3400
Title of 12(b) Security	Class A Common Stock, par value $0.0001
Trading Symbol	DATA
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001303652
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Class A common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		77,093,957
Class B common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		10,368,607

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 553,538	$ 653,022
Short-term investments	491,039	369,355
Accounts receivable, net of allowance for doubtful accounts of $1,889 and $1,608	217,454	236,063
Prepaid expenses and other current assets	187,027	155,012
Income taxes receivable	2,175	2,268
Total current assets	1,451,233	1,415,720
Long-term investments	24,548	26,278
Property and equipment, net	106,016	94,537
Operating lease right-of-use assets	221,606	0
Goodwill	45,430	42,530
Deferred income taxes	4,866	4,733
Other long-term assets	57,916	50,927
Total assets	1,911,615	1,634,725
Current liabilities
Accounts payable	5,214	6,652
Accrued compensation and employee-related benefits	87,991	105,155
Other accrued liabilities	80,676	55,896
Income taxes payable	494	2,982
Deferred revenue	373,001	377,892
Total current liabilities	547,376	548,577
Deferred revenue	21,522	16,306
Operating lease liabilities	257,982	0
Other long-term liabilities	10,286	56,257
Total liabilities	837,166	621,140
Commitments and contingencies (Note 11)
Stockholders' equity
Additional paid-in capital	1,525,144	1,340,628
Accumulated other comprehensive loss	(10,711)	(11,458)
Accumulated deficit	(439,993)	(315,593)
Total stockholders' equity	1,074,449	1,013,585
Total liabilities and stockholders' equity	1,911,615	1,634,725
Preferred Stock
Stockholders' equity
Preferred stock, $0.0001 par value, 10,000,000 shares authorized; none issued	0	0
Class B common stock
Stockholders' equity
Common stock	1	1
Class A common stock
Stockholders' equity
Common stock	$ 8	$ 7

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets Balance Sheet Parenthetical - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 1,889	$ 1,608
Preferred Stock, Par Value (in usd per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Class B common stock
Common Stock, Par Value (in usd per share)	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	75,000,000	75,000,000
Common Stock, Shares Issued	10,368,607	11,042,131
Common Stock, Shares Outstanding	10,368,607	11,042,131
Class A common stock
Common Stock, Par Value (in usd per share)	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	750,000,000	750,000,000
Common Stock, Shares Issued	77,004,113	73,314,823
Common Stock, Shares Outstanding	77,004,113	73,314,823

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Total revenues		$ 322,104	$ 282,289	$ 604,564	$ 528,496
Cost of revenues
Total cost of revenues	[1]	39,846	35,225	79,275	67,650
Gross profit		282,258	247,064	525,289	460,846
Operating expenses
Sales and marketing	[1]	166,668	144,150	329,010	282,556
Research and development	[1]	112,099	94,033	224,243	187,538
General and administrative	[1]	43,326	29,846	105,051	62,096
Total operating expenses		322,093	268,029	658,304	532,190
Operating loss		(39,835)	(20,965)	(133,015)	(71,344)
Other income, net		7,481	6,866	12,667	8,328
Loss before income tax expense (benefit)		(32,354)	(14,099)	(120,348)	(63,016)
Income tax expense (benefit)		3,164	(2,033)	4,052	(4,478)
Net loss		$ (35,518)	$ (12,066)	$ (124,400)	$ (58,538)
Net loss per share:
Basic		$ (0.41)	$ (0.15)	$ (1.45)	$ (0.72)
Diluted		$ (0.41)	$ (0.15)	$ (1.45)	$ (0.72)
Weighted average shares used to compute net loss per share:
Basic		86,711	82,247	86,076	81,647
Diluted		86,711	82,247	86,076	81,647
License
Revenues
Total revenues		$ 146,748	$ 137,848	$ 264,300	$ 246,641
Cost of revenues
Total cost of revenues		5,322	4,626	10,949	8,580
Maintenance and services
Revenues
Total revenues		175,356	144,441	340,264	281,855
Cost of revenues
Total cost of revenues		$ 34,524	$ 30,599	$ 68,326	$ 59,070
[1]	Includes stock-based compensation expense as follows: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands) Cost of revenues $ 4,050 $ 3,299 $ 7,902 $ 6,286 Sales and marketing 24,006 22,150 46,999 42,165 Research and development 32,907 26,837 64,548 51,994 General and administrative 8,124 6,026 15,257 13,630

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations Parenthetical - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cost of revenues
Stock-based Compensation Expense	$ 4,050	$ 3,299	$ 7,902	$ 6,286
Sales and marketing
Stock-based Compensation Expense	24,006	22,150	46,999	42,165
Research and development
Stock-based Compensation Expense	32,907	26,837	64,548	51,994
General and administrative
Stock-based Compensation Expense	$ 8,124	$ 6,026	$ 15,257	$ 13,630

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Loss Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (35,518)	$ (12,066)	$ (124,400)	$ (58,538)
Other comprehensive income (loss), net of tax:
Foreign currency translation	(2,344)	(1,314)	(580)	(728)
Net unrealized gain (loss) on available-for-sale securities	619	74	1,327	(775)
Comprehensive loss	$ (37,243)	$ (13,306)	$ (123,653)	$ (60,041)

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock (Class A and B)	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balances (in shares) at Dec. 31, 2017		80,462,345
Balances at Dec. 31, 2017	$ 753,623	$ 8	$ 1,168,563	$ (11,991)	$ (402,957)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)		1,438,949
Issuance of common stock	$ 2,492	$ 0	2,492
Repurchases of common stock (in shares)	(366,160)
Repurchase of common stock	$ (30,007)		(30,007)
Stock-based compensation expense	64,411		64,411
Other comprehensive loss, net	(263)			(263)
Net loss	(46,472)				(46,472)
Balances (in shares) at Mar. 31, 2018		81,535,134
Balances at Mar. 31, 2018	909,873	$ 8	1,205,459	(10,571)	(285,023)
Balances (in shares) at Dec. 31, 2017		80,462,345
Balances at Dec. 31, 2017	$ 753,623	$ 8	1,168,563	(11,991)	(402,957)
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock (in shares)	(679,081)
Repurchase of common stock	$ (60,000)
Net loss	(58,538)
Balances (in shares) at Jun. 30, 2018		82,940,338
Balances at Jun. 30, 2018	947,962	$ 8	1,256,854	(11,811)	(297,089)
Balances (in shares) at Mar. 31, 2018		81,535,134
Balances at Mar. 31, 2018	909,873	$ 8	1,205,459	(10,571)	(285,023)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)		1,718,125
Issuance of common stock	$ 23,089	$ 0	23,089
Repurchases of common stock (in shares)	(312,921)
Repurchase of common stock	$ (30,006)		(30,006)
Stock-based compensation expense	58,312		58,312
Other comprehensive loss, net	(1,240)			(1,240)
Net loss	(12,066)				(12,066)
Balances (in shares) at Jun. 30, 2018		82,940,338
Balances at Jun. 30, 2018	947,962	$ 8	1,256,854	(11,811)	(297,089)
Balances (in shares) at Dec. 31, 2018		84,356,954
Balances at Dec. 31, 2018	1,013,585	$ 8	1,340,628	(11,458)	(315,593)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)		1,646,055
Issuance of common stock	$ 6,287	$ 1	6,286
Repurchases of common stock (in shares)	(34,986)
Repurchase of common stock	$ (4,326)		(4,326)
Stock-based compensation expense	$ 65,619		65,619
Donation of Class A common stock (in shares)	209,384
Donation of Class A common stock	$ 24,230		24,230
Other comprehensive loss, net	2,472			2,472
Net loss	(88,882)				(88,882)
Balances (in shares) at Mar. 31, 2019		86,177,407
Balances at Mar. 31, 2019	1,018,985	$ 9	1,432,437	(8,986)	(404,475)
Balances (in shares) at Dec. 31, 2018		84,356,954
Balances at Dec. 31, 2018	$ 1,013,585	$ 8	1,340,628	(11,458)	(315,593)
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock (in shares)	(34,986)
Repurchase of common stock	$ (4,300)
Net loss	(124,400)
Balances (in shares) at Jun. 30, 2019		87,372,720
Balances at Jun. 30, 2019	1,074,449	$ 9	1,525,144	(10,711)	(439,993)
Balances (in shares) at Mar. 31, 2019		86,177,407
Balances at Mar. 31, 2019	1,018,985	$ 9	1,432,437	(8,986)	(404,475)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (in shares)		1,195,313
Issuance of common stock	23,620		23,620
Stock-based compensation expense	69,087		69,087
Other comprehensive loss, net	(1,725)			(1,725)
Net loss	(35,518)				(35,518)
Balances (in shares) at Jun. 30, 2019		87,372,720
Balances at Jun. 30, 2019	$ 1,074,449	$ 9	$ 1,525,144	$ (10,711)	$ (439,993)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net loss	$ (124,400)	$ (58,538)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	29,544	19,050
Amortization (accretion) on investments, net	(1,693)	137
Stock-based compensation expense	134,706	114,075
Donation of Class A common stock	24,230	0
Deferred income taxes	(997)	(3,965)
Changes in operating assets and liabilities
Accounts receivable, net	18,263	31,490
Prepaid expenses and other assets	(39,225)	(44,925)
Income taxes receivable	120	(125)
Deferred revenue	689	(3,893)
Accounts payable and accrued liabilities	(17,123)	8,663
Income taxes payable	(2,461)	(2,713)
Net cash provided by operating activities	21,653	59,256
Investing activities
Purchases of property and equipment	(25,463)	(11,076)
Business combinations, net of cash acquired	(4,500)	(10,947)
Purchases of investments	(406,160)	(156,591)
Maturities of investments	289,375	139,685
Sales of investments	0	99
Net cash used in investing activities	(146,748)	(38,830)
Financing activities
Proceeds from issuance of common stock	29,906	25,581
Repurchases of common stock	(4,326)	(60,013)
Net cash provided by (used in) financing activities	25,580	(34,432)
Effect of exchange rate changes on cash and cash equivalents	31	(2,781)
Net decrease in cash and cash equivalents	(99,484)	(16,787)
Cash and cash equivalents
Beginning of period	653,022	627,878
End of period	553,538	611,091
Non-cash activities
Accrued purchases of property and equipment	$ 7,651	$ 2,513

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Tableau Software, Inc., a Delaware corporation, and its wholly-owned subsidiaries (the "Company," "we," "us" or "our") are headquartered in Seattle, Washington. Our software products put the power of data into the hands of everyday people, allowing a broad population of business users to engage with their data, ask questions, solve problems and create value. Based on innovative core technologies originally developed at Stanford University, our products dramatically reduce the complexity, inflexibility and expense associated with traditional business intelligence applications. We currently offer five key products: Tableau Desktop, a self-service, powerful analytics product for anyone with data; Tableau Server, a business intelligence platform for organizations; Tableau Online, a hosted software-as-a-service ("SaaS") version of Tableau Server; Tableau Prep, a data preparation product for combining, shaping and cleaning data; and Tableau Public, a free cloud-based platform for analyzing and sharing public data. Proposed Transaction with Salesforce On June 9, 2019 , the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with salesforce.com, inc. ("Salesforce") and Sausalito Acquisition Corp. ("Purchaser"), a wholly-owned subsidiary of Salesforce. Pursuant to the terms of the Merger Agreement, on July 3, 2019 Purchaser commenced an exchange offer (the "Offer") to purchase each issued and outstanding share of Class A common stock and Class B common stock of the Company (together, the "Common Stock") for 1.103 shares of Salesforce common stock (the "Offer Consideration"). Promptly following the completion of the Offer, upon the terms and subject to the conditions of the Merger Agreement, Purchaser will merge with and into the Company (the "Merger"), with the Company continuing as the surviving corporation and as a wholly-owned subsidiary of Salesforce. The Merger Agreement contemplates that the Merger will be effected pursuant to Section 251(h) of the Delaware General Corporation Law, which permits completion of the Merger without a vote of the holders of Common Stock upon the acquisition by Purchaser of a majority of the aggregate voting power of Common Stock. At the effective time of the Merger (the "Effective Time"), each share of Common Stock, other than the shares accepted for payment in the Offer and certain shares held by the Company, Salesforce or their respective subsidiaries, will be cancelled and converted into the right to receive the Offer Consideration. Holders of Common Stock will receive cash in lieu of fractional shares . As a result of the Merger, the Company will cease to be a publicly traded company. The Offer and the Merger are currently expected to close in the third quarter of Salesforce's 2020 fiscal year, ending October 31, 2019, subject to the satisfaction of customary closing conditions, including among others the tender by Company stockholders of shares of Common Stock representing a majority of the aggregate voting power of Common Stock. The Merger Agreement contains certain termination rights for the Company and Salesforce and further provides that a termination fee of $552 million will be payable by the Company to Salesforce upon termination of the Merger Agreement under certain circumstances, including in the circumstance where the Company terminates to accept and enter into a definitive agreement in respect of a superior proposal . For additional information related to the Merger Agreement, refer to the Solicitation/Recommendation Statement on Schedule 14D-9 filed by the Company and the Registration Statement on Form S-4 filed by Salesforce, each filed with the Securities and Exchange Commission ("SEC") on July 3, 2019, together with the exhibits and annexes thereto and as amended or supplemented from time to time.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial information has been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet data as of December 31, 2018 was derived from audited financial statements but does not include all disclosures required by GAAP. The condensed consolidated financial information should be read in conjunction with the consolidated financial statements and notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC on February 22, 2019 . In the opinion of management, the unaudited condensed consolidated financial statements and accompanying notes include all normal recurring adjustments necessary for a fair presentation of the results for the interim periods presented. Interim results are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 . All intercompany accounts and transactions have been eliminated in consolidation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates include but are not limited to: the collectability of our receivables; the evaluation of our contract assets for impairment; the useful lives of our long-lived assets; the benefit period for deferred commissions; the valuation of investments and the determination of other-than-temporary impairments; the discount rates used in measuring our operating lease liabilities; and the reported amounts of accrued liabilities. For revenue, we make estimates and assumptions related to the standalone selling prices of our products and services and the nature and timing of the delivery of performance obligations from our contracts with customers. We also use estimates in stock-based compensation, income taxes and business combinations. Actual results could differ from those estimates. Risks and Uncertainties Inherent in our business are various risks and uncertainties, including our limited history of operating our business at its current scale and development of advanced technologies in a rapidly changing industry. These risks include our ability to manage our growth, to attract new customers, to expand sales to existing customers and to attract, integrate and retain qualified personnel, as well as other risks and uncertainties. In the event that we do not successfully implement our business plan, certain assets may not be recoverable, certain liabilities may not be paid and investments in our capital stock may not be recoverable. Our success depends upon the acceptance of our technology, development of sales and distribution channels and our ability to generate significant revenues from the sale of our technology. Segments We follow the authoritative literature that establishes annual and interim reporting standards for operating segments and related disclosures about products and services, geographic regions and major customers. We operate our business as one operating segment. Our chief operating decision makers are our Chief Executive Officer and Chief Financial Officer, who review financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources. Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments, accounts receivable and contract assets. Our cash and cash equivalents and investments are held and managed by recognized financial institutions that follow our investment policy. Our investment portfolio consists of investment-grade securities diversified among security types, industries and issuers. Our policy limits the amount of credit exposure to any one security issue or issuer. We extend credit to customers based upon an evaluation of the customer's financial condition. As of June 30, 2019 and December 31, 2018 , no individual customer accounted for 10% or more of total accounts receivable or 10% or more of our total contract assets. For the three and six months ended 2019 and 2018 , no individual customer accounted for 10% or more of our total revenues. Leases - Accounting Standards Codification 842 Leases arise from contracts which convey the right to control the use of identified property or equipment for a period of time in exchange for consideration. Our leasing arrangements are primarily for office space we use to conduct our operations. We determine whether contracts include a lease at the inception date, which is generally upon contract signing, considering factors such as whether the contract includes an asset which is physically distinct, which party obtains substantially all of the capacity and economic benefit of the asset, and which party directs how, and for what purpose, the asset is used during the contract period. Our leases commence when the lessor makes the asset available for our use. At commencement we record a lease liability at the present value of future lease payments, net of any future lease incentives to be received. Many of our lease agreements include cancellable future periods subject to termination or extension options. We do not include cancellable lease periods in our future lease payments unless we are reasonably certain to continue to utilize the asset for those periods. We calculate the present value of future lease payments at commencement using a discount rate which we estimate as the collateralized borrowing rate we would incur on our future lease payments over a similar term. At commencement we also record a corresponding right-of-use asset, which is calculated based on the amount of the lease liability, adjusted for any advance lease payments paid, initial direct costs incurred or lease incentives received prior to commencement. Right-of-use assets are subject to evaluation for impairment or disposal on a basis consistent with other long-lived assets. Leases are classified at commencement as either operating or finance leases. As of June 30, 2019 , all of our leases are classified as operating leases. Rent expense for operating leases is recognized on the straight-line method over the term of the agreement beginning on the lease commencement date. In accounting for leases, we utilize certain practical expedients and policy elections available under the lease accounting standard. For example, we do not record right-of-use assets or lease liabilities for leases with terms of 12 months or less. For contracts containing real estate leases, we combine lease and non-lease components. The primary impact of this policy election is that we include in our calculation of lease liabilities any fixed and noncancelable future payments due under the contract for items such as parking, common area maintenance, utilities and other costs. Lease-related costs which are variable rather than fixed are expensed in the period incurred. Assumptions, judgments and estimates impacting the carrying value of our right-of-use assets and liabilities include evaluating whether an arrangement contains a lease, determining whether the lease term should include any cancellable future periods, estimating the discount rate used to calculate our lease liabilities, estimating the fair value and useful life of the leased asset for the purpose of classifying the lease as an operating or finance lease, evaluating whether a lease contract amendment represents a new lease agreement or a modification to the existing lease and evaluating our right-of-use assets for impairment. We also account for all subleases from the perspective of a lessor. We evaluate the duration of subleases based on the reasonable certainty of any sublessor termination and extension options, as well as the lease term for the underlying asset. As of June 30, 2019 , all of our subleases are classified as operating leases. For subleases classified as operating leases, we record sublease income as a reduction of operating expense on the straight-line method over the lease term. Our accounting policy under the previous lease standard, Accounting Standards Codification ("ASC") 840, is included in our Annual Report on Form 10-K for the year ended December 31, 2018, which was filed with the SEC on February 22, 2019. Recently Adopted Accounting Pronouncements We adopted the new lease accounting standard, ASC 842, on January 1, 2019 using the modified retrospective transition method, and recorded a balance sheet adjustment on the date of adoption. The new lease standard requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet for operating leases, and also requires additional quantitative and qualitative disclosures to enable users of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. In adopting ASC 842, we utilized certain practical expedients available under the standard. These practical expedients include waiving reassessment of conclusions reached under the previous lease standard as to whether contracts contain leases, how to classify leases identified and how to account for initial direct costs incurred. We also utilized the practical expedient to use hindsight as of the date of adoption to determine the terms of our leases and to evaluate our right-of-use assets for impairment. We recorded the following adjustments to our consolidated balance sheet on the date of adoption: December 31, 2018 January 1, 2019 As Reported Adjustment Recorded Adjusted Balance (in thousands) Prepaid expenses and other current assets $ 155,012 $ (378 ) $ 154,634 Operating lease right-of-use assets — 210,914 210,914 Other long-term assets 50,927 (28 ) 50,899 Other accrued liabilities 55,896 14,500 70,396 Operating lease liabilities — 242,916 242,916 Other long-term liabilities 56,257 (46,908 ) 9,349 See Note 5 of the accompanying notes to the condensed consolidated financial statements for additional information regarding our operating leases. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued Accounting Standards Update ("ASU") 2016-13, related to credit losses. The new guidance replaces the existing incurred loss impairment model with an expected credit loss model and requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. ASU 2016-13 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. We will adopt this standard in the first quarter of 2020. We are currently evaluating the impact that this standard will have on our consolidated financial statements.

Short-Term and Long-Term Invest

Short-Term and Long-Term Investments	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Short-term and Long-term Investments	Short-Term and Long-Term Investments The following tables present our short-term and long-term investments in available-for-sale securities based on remaining contractual years to maturity: June 30, 2019 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments Commercial paper $ 33,234 $ — $ — $ 33,234 U.S. treasury securities 328,308 376 (29 ) 328,655 U.S. agency securities 22,720 9 (3 ) 22,726 Corporate bonds 106,298 136 (10 ) 106,424 Total short-term investments 490,560 521 (42 ) 491,039 Long-term investments Corporate bonds 24,424 124 — 24,548 Total long-term investments 24,424 124 — 24,548 Total short-term and long-term investments $ 514,984 $ 645 $ (42 ) $ 515,587 December 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments Commercial paper $ 7,949 $ — $ — $ 7,949 U.S. treasury securities 206,486 24 (457 ) 206,053 U.S. agency securities 18,576 — (61 ) 18,515 Corporate bonds 137,119 — (281 ) 136,838 Total short-term investments 370,130 24 (799 ) 369,355 Long-term investments U.S. treasury securities 13,352 5 (50 ) 13,307 Corporate bonds 13,025 2 (56 ) 12,971 Total long-term investments 26,377 7 (106 ) 26,278 Total short-term and long-term investments $ 396,507 $ 31 $ (905 ) $ 395,633 The following tables present the fair values and the gross unrealized losses related to our investments in available-for-sale securities that were in an unrealized loss position as of June 30, 2019 and December 31, 2018 , summarized by the length of time that the investments have been in a continuous unrealized loss position: June 30, 2019 Less Than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (in thousands) Short-term investments U.S. treasury securities $ — $ — $ 39,900 $ (29 ) $ 39,900 $ (29 ) U.S. agency securities — — 3,572 (3 ) 3,572 (3 ) Corporate bonds 4,995 (2 ) 9,263 (8 ) 14,258 (10 ) Total short-term investments 4,995 (2 ) 52,735 (40 ) 57,730 (42 ) As of June 30, 2019 , no investments classified as long-term investments were in an unrealized loss position. December 31, 2018 Less Than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (in thousands) Short-term investments U.S. treasury securities $ 89,320 $ (143 ) $ 79,472 $ (314 ) $ 168,792 $ (457 ) U.S. agency securities — — 18,515 (61 ) 18,515 (61 ) Corporate bonds 91,455 (131 ) 45,383 (150 ) 136,838 (281 ) Total short-term investments 180,775 (274 ) 143,370 (525 ) 324,145 (799 ) Long-term investments U.S. treasury securities 9,855 (50 ) — — 9,855 (50 ) Corporate bonds 11,389 (56 ) — — 11,389 (56 ) Total long-term investments 21,244 (106 ) — — 21,244 (106 ) Total short-term and long-term investments $ 202,019 $ (380 ) $ 143,370 $ (525 ) $ 345,389 $ (905 ) The unrealized losses on investments as of June 30, 2019 were primarily caused by increases in interest rates from the date such investments were purchased. None of the unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence as of June 30, 2019

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We categorize assets and liabilities recorded at fair value based upon the level of judgment associated with inputs used to measure their fair value. The levels of the fair value hierarchy are as follows: • Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs are quoted prices for similar assets and liabilities in active markets or quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. • Level 3—Inputs are unobservable inputs based on our own assumptions and valuation techniques used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. We value our investments using quoted prices for identical instruments in active markets when available. If we are unable to obtain quoted prices for identical instruments in active markets, we value our investments using quoted market prices for comparable instruments. To date, all of our investments can be valued using one of these two methodologies. The following tables present the fair value of our financial assets using the fair value hierarchy: June 30, 2019 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents Money market funds $ 458,260 $ — $ — $ 458,260 Commercial paper — 11,986 — 11,986 U.S. treasury securities — 8,041 — 8,041 U.S. agency securities — 2,497 — 2,497 Short-term investments Commercial paper — 33,234 — 33,234 U.S. treasury securities — 328,655 — 328,655 U.S. agency securities — 22,726 — 22,726 Corporate bonds — 106,424 — 106,424 Long-term investments Corporate bonds — 24,548 — 24,548 Total $ 458,260 $ 538,111 $ — $ 996,371 December 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents Money market funds $ 610,732 $ — $ — $ 610,732 Corporate bonds — 3,009 — 3,009 Short-term investments Commercial paper — 7,949 — 7,949 U.S. treasury securities — 206,053 — 206,053 U.S. agency securities — 18,515 — 18,515 Corporate bonds — 136,838 — 136,838 Long-term investments U.S. treasury securities — 13,307 — 13,307 Corporate bonds — 12,971 — 12,971 Total $ 610,732 $ 398,642 $ — $ 1,009,374 We did not have any investments in prime money market funds as of June 30, 2019 or December 31, 2018 . We did not have any material financial assets or liabilities measured using Level 3 inputs as of June 30, 2019 or December 31, 2018 .

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases Our leasing arrangements are primarily for office space we use to conduct our operations. We have subleased some office space for all or part of the associated head lease. The following table presents our future lease payments for long-term operating leases, net of expected sublease income, as of June 30, 2019 : Period Operating Lease Commitments Expected Sublease Receipts Net Future Operating Lease Commitments (in thousands) Remainder of 2019 $ 7,658 $ (4,980 ) $ 2,678 2020 44,059 (7,806 ) 36,253 2021 48,683 (1,208 ) 47,475 2022 48,016 (625 ) 47,391 2023 48,975 (128 ) 48,847 Thereafter 156,062 — 156,062 Total $ 353,453 $ (14,747 ) $ 338,706 Less: Imputed interest (79,778 ) Total operating lease liabilities $ 273,675 Cash paid for operating lease liabilities for the six months ended June 30, 2019 was $22.8 million . We recorded $25.2 million in non-cash increases to our operating lease right-of-use assets and operating lease liabilities as a result of leases that commenced or were modified during the six months ended June 30, 2019 . As of June 30, 2019 , we had signed leases for additional office space that had not yet commenced. Future noncancellable lease payments associated with these agreements total $12.9 million , payable over lease terms ranging from 13 months to seven years . The following table presents supplemental balance sheet information related to leases as of June 30, 2019 : June 30, 2019 (dollars in thousands) Other accrued liabilities $ 15,693 Operating lease liabilities 257,982 Total operating lease liabilities $ 273,675 Weighted average remaining lease term (in years) 7.8 Weighted average discount rate 6.1 % The components of our lease expense for the six months ended June 30, 2019 were as follows: Six Months Ended (in thousands) Operating lease costs $ 23,166 Variable lease costs 7,333 Short-term lease costs 3,538 Sublease income (4,710 ) Total lease cost, net $ 29,327 Under ASC 840, the previous lease standard, total rent expense under operating leases, net of sublease income, was approximately $17.1 million for the six months ended June 30, 2018 .

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock Our certificate of incorporation, as amended and restated, authorizes us to issue 75,000,000 shares of Class B common stock, at $0.0001 par value per share, and 750,000,000 shares of Class A common stock, at $0.0001 par value per share. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each holder of Class B common stock is entitled to ten votes per share and each holder of Class A common stock is entitled to one vote per share. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder and are automatically converted upon sale or transfer to Class A common stock, subject to certain limited exceptions. At its discretion, the board of directors may declare dividends on shares of common stock, subject to the rights of our preferred stockholders, if any. Upon liquidation or dissolution, holders of common stock will receive distributions only after preferred stock preferences have been satisfied. Preferred Stock Our certificate of incorporation, as amended and restated, authorizes us to issue 10,000,000 shares of preferred stock at $0.0001 par value per share. Our board of directors has the authority to provide for the issuance of all the shares in one or more series. At its discretion, our board of directors may designate the voting rights and preferences of the preferred stock. As of June 30, 2019 and December 31, 2018 , no shares of preferred stock were outstanding. Donation to Tableau Foundation On January 3, 2019, we donated 209,384 shares of our Class A common stock to Tableau Foundation, a donor-advised charitable fund. We recorded a charge of $24.2 million to general and administrative expense based on the closing price of our Class A common stock as reported on the New York Stock Exchange on the date of donation. Stock Repurchase Program On November 1, 2016, we announced that our board of directors approved a stock repurchase program, under which we were authorized to repurchase up to $200 million of our outstanding Class A common stock. On April 26, 2018, our board of directors authorized us to repurchase up to an additional $300 million of our outstanding Class A common stock under our previously announced stock repurchase program. The repurchase program has no expiration date and may be modified, suspended or discontinued at any time. Repurchases under the program may be made from time to time on the open market at prevailing market prices, in privately negotiated transactions, in transactions structured through investment banking institutions or a combination of the foregoing, in compliance with Rule 10b-18 under the Securities Exchange Act of 1934, as amended. During the six months ended June 30, 2019 , we repurchased 34,986 shares of our outstanding Class A common stock at an average price of $123.64 per share for $4.3 million . During the six months ended June 30, 2018 , we repurchased 679,081 shares of our outstanding Class A common stock at an average price of $88.37 per share for $60.0 million . All repurchases were made in open market transactions using cash on hand, and all of the shares repurchased were retired. As of June 30, 2019 , we were authorized to repurchase a remaining $275.7 million of our Class A common stock under our repurchase program.

Business Combination

Business Combination	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Business Combination	Business Combination Empirical Systems, Inc. On June 7, 2018, we acquired all issued and outstanding stock of Empirical Systems, Inc., a privately-held Delaware corporation, for $11.0 million in cash. Empirical Systems, Inc. was a startup specializing in automated statistical analysis. As a result of this acquisition, we acquired all of the assets and assumed all of the liabilities of Empirical Systems, Inc., and we accounted for this transaction as a business combination. Pro forma results of operations for this acquisition have not been presented as the effects were not material to our financial results. The following table summarizes the purchase price allocation based on the estimated fair value of the net assets acquired: June 7, 2018 (in thousands) Cash $ 53 Technology asset 3,500 Goodwill 7,447 Net assets acquired $ 11,000 The technology asset acquired in this business combination is being amortized on the straight-line method over a period of five years . Goodwill generated from this business combination was primarily attributable to expected synergies between the technology asset acquired and our key products. None of the goodwill recognized with this transaction was deductible for U.S. income tax purposes. Certain employees hired in conjunction with the acquisition of Empirical Systems, Inc. received RSUs that are subject to service conditions as well as the completion of certain technology milestones. We account for these awards as a post-business combination expense.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Timing may differ between the satisfaction of performance obligations and the invoicing and collection of amounts related to our contracts with customers. We record assets for amounts related to performance obligations that are satisfied but not yet billed and/or collected. These assets are recorded as contract assets rather than receivables when receipt of the consideration is conditional on something other than the passage of time. Liabilities are recorded for amounts that are collected in advance of the satisfaction of performance obligations. These liabilities are classified as current and non-current deferred revenue. Contract Assets and Contract Liabilities The following table presents the activity impacting our contract assets during the six months ended June 30, 2019 : Contract Assets (in thousands) Balance at December 31, 2018 $ 105,593 Contract assets transferred to receivables (41,640 ) Additions to contract assets 66,798 Balance at June 30, 2019 $ 130,751 Contract assets are included in prepaid expenses and other current assets. There were no material impairments of contract assets during the six months ended June 30, 2019 . The following table presents the activity impacting our deferred revenue balances during the six months ended June 30, 2019 : Deferred Revenue (in thousands) Balance at December 31, 2018 $ 394,198 Deferred revenue recognized (251,413 ) Additional amounts deferred 251,738 Balance at June 30, 2019 $ 394,523 Assets Recognized from the Costs to Obtain our Contracts with Customers We recognize an asset for the incremental costs of obtaining a contract with a customer if we expect the benefit of those costs to be longer than one year . We amortize these deferred costs proportionate with related revenues over the benefit period, currently estimated to be four years . The following table presents the activity impacting our deferred contract costs during the six months ended June 30, 2019 : Deferred Contract Costs (in thousands) Balance at December 31, 2018 $ 51,401 Additional contract costs deferred 19,414 Amortization of deferred contract costs (9,512 ) Balance at June 30, 2019 $ 61,303 As of June 30, 2019 , $21.4 million of our deferred contract costs are expected to be amortized within the next 12 months and therefore are included in prepaid expenses and other current assets. The remaining amount of our deferred contract costs are included in other long-term assets. There were no material impairments of assets related to deferred contract costs during the six months ended June 30, 2019 . There were no assets recognized related to our costs to fulfill contracts during the six months ended June 30, 2019 as these costs were not material. Remaining Performance Obligations Our contracts with customers include amounts allocated to performance obligations that will be satisfied at a later date. As of June 30, 2019 , amounts allocated to these additional contractual obligations are $276.6 million , of which we expect to recognize $234.1 million as revenue over the next 24 months with the remaining amount thereafter. These amounts represent additional performance obligations that are not yet recorded in our consolidated balance sheet.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Our 2004 Equity Incentive Plan (the "2004 Plan") authorized the granting of options to purchase shares of our Class B common stock, RSUs and other stock-based awards to our employees, consultants, officers and directors. Our 2013 Equity Incentive Plan, as amended, (the "2013 Plan" and, together with the 2004 Plan, the "Plans"), which is the successor to our 2004 Plan, authorizes the granting of options to purchase shares of our Class A common stock, RSUs and other stock-based awards to our employees, consultants, officers and directors. Options granted under the Plans may be incentive or nonstatutory stock options. Incentive stock options may only be granted to employees. The term of each option is stated in the award agreement but shall be no more than ten years from the date of grant. The board of directors determines the period over which options and RSUs become vested. Currently, the vesting period for our options and RSUs is typically four years . Our 2013 Employee Stock Purchase Plan ("2013 ESPP") allows eligible employees to purchase shares of our Class A common stock, at a discount, through payroll deductions of up to 15% of their eligible compensation, subject to plan limitations. The 2013 ESPP currently includes purchase periods approximately six months in duration starting on the first trading date on or after June 1 st and December 1 st of each year. Participants are able to purchase shares of our common stock at 85% of the lower of its fair market value on (i) the first day of the purchase period or on (ii) the purchase date, which is the last day of the purchase period. A summary of the option activity during the six months ended June 30, 2019 follows: Options Outstanding Shares Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (in years) (in thousands) Balances at December 31, 2018 1,919,383 $ 10.44 Options exercised (1,004,153 ) 7.69 Balances at June 30, 2019 915,230 $ 13.47 3.17 $ 139,621 Vested and expected to vest at June 30, 2019 915,230 $ 13.47 3.17 $ 139,621 Exercisable at June 30, 2019 891,792 $ 12.38 3.07 $ 137,016 The intrinsic value is the difference between the fair value of our Class A common stock as of June 30, 2019 and the exercise price of each of the respective stock options. A summary of the RSU activity, including RSU awards subject to technology milestones, during the six months ended June 30, 2019 follows: Number of Shares Underlying Outstanding RSUs Weighted Average Grant-Date Fair Value per RSU Non-Vested outstanding at December 31, 2018 7,194,454 $ 77.66 RSUs granted 2,160,857 127.34 RSUs vested (1,605,125 ) 73.84 RSUs forfeited (433,155 ) 80.42 Non-Vested outstanding at June 30, 2019 7,317,031 $ 93.01 Additionally during the six months ended June 30, 2019 , we granted RSU awards subject to performance conditions other than technology milestones, under which certain executives and key employees may earn up to 70,879 RSUs. Vesting of these awards is dependent upon achievement of specified revenue goals. An RSU award entitles the holder to receive shares of our Class A common stock as the award vests, which is generally based on length of service. Our non-vested RSUs do not have nonforfeitable rights to dividends or dividend equivalents. Stock-based compensation expense is recognized using the straight-line method over the requisite service period. We account for forfeitures as they occur. For RSU awards subject to technology milestones or other performance conditions, we recognize compensation cost over the estimated requisite service period if we believe it is probable that the associated technology milestones or other performance conditions will be met. If our assessment of the probability of the technology milestones or other performance conditions being met changes, we recognize the impact of the change in estimate in the period of the change. As of June 30, 2019 , total unrecognized compensation expense related to stock options and non-vested RSUs, including RSU awards subject to technology milestones or other performance conditions, was $625.0 million , which is expected to be recognized over a weighted average period of 3.0 years . The summary of shares available for issuance of equity-based awards (including stock options, RSUs, including RSU awards subject to technology milestones or other performance conditions, and shares issuable under our 2013 ESPP) during the six months ended June 30, 2019 follows: Shares Available for Grant 2013 Plan 2013 ESPP Balances at December 31, 2018 7,687,965 3,979,544 Authorized 4,217,847 843,569 Granted (2,231,736 ) (232,090 ) Forfeited 433,155 — Balances at June 30, 2019 10,107,231 4,591,023

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The income tax provision for interim periods is generally determined using an estimate of our annual effective tax rate, excluding jurisdictions for which no benefit can be recognized due to valuation allowance, and adjusted for discrete items, if any, in the relevant period. However, given current and expected operating activities during the year, estimating a reliable annual effective tax rate has become increasingly difficult. Even small changes in forecasted results can produce significant changes to our annual effective tax rate. Therefore, we have determined that the actual year to date effective tax rate is the best estimate for the reporting period ended June 30, 2019 . We will continue to utilize this methodology until reliable estimates of the annual effective tax rate can be made. Our effective tax rate is impacted by, and differs from the federal statutory rate primarily due to, the full valuation allowance on our U.S. federal and state deferred tax assets, the effect of income or losses incurred in foreign jurisdictions where the statutory tax rate differs from the federal statutory rate and non-deductible stock-based compensation. We recognized income tax expense of $3.2 million and $4.1 million for the three and six months ended June 30, 2019 , respectively, compared to an income tax benefit of $2.0 million and $4.5 million for the three and six months ended June 30, 2018 , respectively. Our effective tax rate was (9.8)% and (3.4)% for the three and six months ended June 30, 2019 , respectively, compared to 14.4% and 7.1% for the three and six months ended June 30, 2018 , respectively. The year-over-year change in the effective tax rates for the three and six month periods is primarily attributable to increased losses incurred in foreign jurisdictions where related tax benefits are not available. We periodically evaluate the realizability of our net deferred tax assets based on all available evidence, both positive and negative such as historic results, future reversals of existing deferred tax liabilities, projected future taxable income, as well as prudent and feasible tax-planning strategies. Generally, more weight is given to objectively verifiable evidence, such as the cumulative loss in recent years. As of June 30, 2019 , we maintain a full valuation allowance on our U.S. federal and state deferred tax assets.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contractual Commitments Our non-lease contractual commitments are associated with agreements that are enforceable and legally binding and that specify all significant terms, including fixed or minimum services to be used, fixed, minimum or variable price provisions and the approximate timing of the transaction. Obligations under contracts that we can cancel without a significant penalty are not included. There have been no material changes to our non-lease contractual commitments compared to those discussed in Note 11 of our Annual Report on Form 10-K for the year ended December 31, 2018 . Legal Proceedings Securities Litigation. On July 28, 2017, and August 2, 2017, respectively, two substantially similar securities class action complaints were filed against the Company and two of its current and former executive officers. The first complaint was filed in the U.S. District for the Southern District of New York (the "Scheufele Action"). The second complaint was filed in the U.S. District Court for the Western District of Washington (the "Abarrientos Action"). On October 17, 2017, the Abarrientos Action was voluntarily dismissed. On October 18, 2017, the Court appointed a lead plaintiff and lead counsel in the Scheufele Action. On December 8, 2017, lead plaintiff filed an amended complaint, which alleged that between February 5, 2015 and February 4, 2016, the Company and certain of its executive officers violated Sections 10(b) and 20(a) of the Exchange Act and SEC Rule 10b-5 promulgated thereunder, in connection with statements regarding the Company's business and operations by allegedly failing to disclose that product launches and software upgrades by competitors were negatively impacting the Company's competitive position and profitability. The amended complaint sought unspecified damages, interest, attorneys' fees and other costs. Defendants filed a motion to dismiss the amended complaint on January 12, 2018. On February 2, 2018, lead plaintiff filed a second amended complaint (the "SAC"), which contains substantially similar allegations as the amended complaint, and adds as defendants two of the Company's current and former executive officers and directors. Defendants filed a motion to dismiss the SAC on March 13, 2018. On February 8, 2019, the court denied Defendants' motion to dismiss the SAC. Defendants filed an answer to the SAC on March 1, 2019, and subsequently amended their answer on April 18, 2019. The court entered a scheduling order on May 29, 2019, but did not set a trial date. On July 10 and 11, 2019, respectively, three civil actions were filed against Tableau and each of the current members of Tableau's board of directors asserting claims under Sections 14(e), 14(d), and 20(a) of the Securities Exchange Act of 1934 challenging the adequacy of certain public disclosures made by Tableau concerning the Company's proposed transaction with Salesforce.com. Specifically, on July 10, 2019, Shiva Stein, a purported stockholder of Tableau, commenced an action in the United States District Court for the District of Delaware (the "Stein Action"). That same day, Marcy Curtis, a purported stockholder of Tableau, commenced a putative class action in the United States District Court for the District of Delaware (the "Curtis Action"). And, on July 11, 2019, Cathy O'Brien, a purported stockholder of Tableau, commenced an action in the United States District Court for the Southern District of New York (the "O'Brien Action"). The plaintiffs seek, among other things, an injunction preventing consummation of the proposed transaction with Salesforce, rescission of the proposed transaction or rescissory damages in the event it is consummated, an accounting by the defendants for all damages caused to the plaintiffs, and the award of attorneys' fees and expenses. Defendants have not answered the complaints in the Stein, Curtis, or O'Brien Actions. Derivative Litigation. On August 7, 2018, a shareholder derivative action was filed in the United States District Court for the District of Delaware, allegedly on behalf of and for the benefit of the Company, against certain of our current and former directors and officers. The Company was named as a nominal defendant. The derivative action arises out of many of the factual allegations at issue in the above-referenced securities litigation, and generally alleges that the individual defendants breached fiduciary duties owed to the Company. The complaint seeks unspecified damages and equitable relief, attorneys' fees, costs and expenses. The case is currently stayed. We believe the lawsuits are without merit and intend to vigorously defend. We are not in a position to assess whether any loss or adverse effect on our financial condition is probable or remote or to estimate the range of potential loss, if any. In the ordinary course of business, we are also involved in various legal proceedings and claims related to intellectual property rights, commercial disputes, employment and wage and hour laws, alleged securities laws violations or other investor claims and other matters. We evaluate these claims and lawsuits with respect to their potential merits, our potential defenses and counter claims, and the expected effect on us of defending the claims and potential adverse result. We make a provision for a liability relating to a claim when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. When we make such provisions, they are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter. We recognize legal expenses as incurred. Management does not expect these proceedings or lawsuits to have a material impact on the liquidity, results of operations, or financial condition of the Company; however, litigation is inherently uncertain and the actual losses incurred in the event that our legal proceedings were to result in unfavorable outcomes could have a material adverse effect on our business and financial performance.

Segments and Information about

Segments and Information about Revenues by Geographic Region	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segments and Information about Revenues by Geographic Area	Segments and Information about Revenues by Geographic Area The following table presents our revenues by geographic region of end users who purchased products or services for the periods presented below: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands) United States and Canada $ 224,772 $ 196,992 $ 421,674 $ 364,791 International 97,332 85,297 182,890 163,705 Total revenues $ 322,104 $ 282,289 $ 604,564 $ 528,496 For the three and six months ended June 30, 2019 and 2018 , no individual country other than the United States represented 10% or more of our total revenues.

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss per Share The following table presents the computation of basic and diluted net loss per share for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands, except per share amounts) Net loss per share - basic and diluted Net loss $ (35,518 ) $ (12,066 ) $ (124,400 ) $ (58,538 ) Weighted average shares outstanding used to compute basic and diluted net loss per share 86,711 82,247 86,076 81,647 Net loss per share - basic and diluted $ (0.41 ) $ (0.15 ) $ (1.45 ) $ (0.72 ) The following table presents shares which were excluded from the computation of diluted net loss per share for the periods presented as their effect would have been antidilutive: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands) Shares subject to outstanding common stock awards 8,425 10,078 8,425 10,078

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial information has been prepared in accordance with generally accepted accounting principles in the United States ("GAAP") and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet data as of December 31, 2018 was derived from audited financial statements but does not include all disclosures required by GAAP. The condensed consolidated financial information should be read in conjunction with the consolidated financial statements and notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC on February 22, 2019 . In the opinion of management, the unaudited condensed consolidated financial statements and accompanying notes include all normal recurring adjustments necessary for a fair presentation of the results for the interim periods presented. Interim results are not necessarily indicative of the results that may be expected for the year ending December 31, 2019 . All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates include but are not limited to: the collectability of our receivables; the evaluation of our contract assets for impairment; the useful lives of our long-lived assets; the benefit period for deferred commissions; the valuation of investments and the determination of other-than-temporary impairments; the discount rates used in measuring our operating lease liabilities; and the reported amounts of accrued liabilities. For revenue, we make estimates and assumptions related to the standalone selling prices of our products and services and the nature and timing of the delivery of performance obligations from our contracts with customers. We also use estimates in stock-based compensation, income taxes and business combinations. Actual results could differ from those estimates.
Risk And Uncertainties	Risks and Uncertainties Inherent in our business are various risks and uncertainties, including our limited history of operating our business at its current scale and development of advanced technologies in a rapidly changing industry. These risks include our ability to manage our growth, to attract new customers, to expand sales to existing customers and to attract, integrate and retain qualified personnel, as well as other risks and uncertainties. In the event that we do not successfully implement our business plan, certain assets may not be recoverable, certain liabilities may not be paid and investments in our capital stock may not be recoverable. Our success depends upon the acceptance of our technology, development of sales and distribution channels and our ability to generate significant revenues from the sale of our technology.
Segments	Segments We follow the authoritative literature that establishes annual and interim reporting standards for operating segments and related disclosures about products and services, geographic regions and major customers. We operate our business as one operating segment. Our chief operating decision makers are our Chief Executive Officer and Chief Financial Officer, who review financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments, accounts receivable and contract assets. Our cash and cash equivalents and investments are held and managed by recognized financial institutions that follow our investment policy. Our investment portfolio consists of investment-grade securities diversified among security types, industries and issuers. Our policy limits the amount of credit exposure to any one security issue or issuer. We extend credit to customers based upon an evaluation of the customer's financial condition. As of June 30, 2019 and December 31, 2018 , no individual customer accounted for 10% or more of total accounts receivable or 10% or more of our total contract assets. For the three and six months ended 2019 and 2018 , no individual customer accounted for 10% or more of our total revenues.
Leases	Leases - Accounting Standards Codification 842 Leases arise from contracts which convey the right to control the use of identified property or equipment for a period of time in exchange for consideration. Our leasing arrangements are primarily for office space we use to conduct our operations. We determine whether contracts include a lease at the inception date, which is generally upon contract signing, considering factors such as whether the contract includes an asset which is physically distinct, which party obtains substantially all of the capacity and economic benefit of the asset, and which party directs how, and for what purpose, the asset is used during the contract period. Our leases commence when the lessor makes the asset available for our use. At commencement we record a lease liability at the present value of future lease payments, net of any future lease incentives to be received. Many of our lease agreements include cancellable future periods subject to termination or extension options. We do not include cancellable lease periods in our future lease payments unless we are reasonably certain to continue to utilize the asset for those periods. We calculate the present value of future lease payments at commencement using a discount rate which we estimate as the collateralized borrowing rate we would incur on our future lease payments over a similar term. At commencement we also record a corresponding right-of-use asset, which is calculated based on the amount of the lease liability, adjusted for any advance lease payments paid, initial direct costs incurred or lease incentives received prior to commencement. Right-of-use assets are subject to evaluation for impairment or disposal on a basis consistent with other long-lived assets. Leases are classified at commencement as either operating or finance leases. As of June 30, 2019 , all of our leases are classified as operating leases. Rent expense for operating leases is recognized on the straight-line method over the term of the agreement beginning on the lease commencement date. In accounting for leases, we utilize certain practical expedients and policy elections available under the lease accounting standard. For example, we do not record right-of-use assets or lease liabilities for leases with terms of 12 months or less. For contracts containing real estate leases, we combine lease and non-lease components. The primary impact of this policy election is that we include in our calculation of lease liabilities any fixed and noncancelable future payments due under the contract for items such as parking, common area maintenance, utilities and other costs. Lease-related costs which are variable rather than fixed are expensed in the period incurred. Assumptions, judgments and estimates impacting the carrying value of our right-of-use assets and liabilities include evaluating whether an arrangement contains a lease, determining whether the lease term should include any cancellable future periods, estimating the discount rate used to calculate our lease liabilities, estimating the fair value and useful life of the leased asset for the purpose of classifying the lease as an operating or finance lease, evaluating whether a lease contract amendment represents a new lease agreement or a modification to the existing lease and evaluating our right-of-use assets for impairment. We also account for all subleases from the perspective of a lessor. We evaluate the duration of subleases based on the reasonable certainty of any sublessor termination and extension options, as well as the lease term for the underlying asset. As of June 30, 2019 , all of our subleases are classified as operating leases. For subleases classified as operating leases, we record sublease income as a reduction of operating expense on the straight-line method over the lease term. Our accounting policy under the previous lease standard, Accounting Standards Codification ("ASC") 840, is included in our Annual Report on Form 10-K for the year ended December 31, 2018, which was filed with the SEC on February 22, 2019.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements We adopted the new lease accounting standard, ASC 842, on January 1, 2019 using the modified retrospective transition method, and recorded a balance sheet adjustment on the date of adoption. The new lease standard requires lessees to recognize right-of-use assets and lease liabilities on the balance sheet for operating leases, and also requires additional quantitative and qualitative disclosures to enable users of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. In adopting ASC 842, we utilized certain practical expedients available under the standard. These practical expedients include waiving reassessment of conclusions reached under the previous lease standard as to whether contracts contain leases, how to classify leases identified and how to account for initial direct costs incurred. We also utilized the practical expedient to use hindsight as of the date of adoption to determine the terms of our leases and to evaluate our right-of-use assets for impairment. We recorded the following adjustments to our consolidated balance sheet on the date of adoption: December 31, 2018 January 1, 2019 As Reported Adjustment Recorded Adjusted Balance (in thousands) Prepaid expenses and other current assets $ 155,012 $ (378 ) $ 154,634 Operating lease right-of-use assets — 210,914 210,914 Other long-term assets 50,927 (28 ) 50,899 Other accrued liabilities 55,896 14,500 70,396 Operating lease liabilities — 242,916 242,916 Other long-term liabilities 56,257 (46,908 ) 9,349 See Note 5 of the accompanying notes to the condensed consolidated financial statements for additional information regarding our operating leases. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued Accounting Standards Update ("ASU") 2016-13, related to credit losses. The new guidance replaces the existing incurred loss impairment model with an expected credit loss model and requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. ASU 2016-13 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. We will adopt this standard in the first quarter of 2020. We are currently evaluating the impact that this standard will have on our consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Effect Of New Accounting Principle In Period Of Adoption (Tables)	6 Months Ended
	Jun. 30, 2019
Adjustments Related To Adoption of New Lease Standard [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	We recorded the following adjustments to our consolidated balance sheet on the date of adoption: December 31, 2018 January 1, 2019 As Reported Adjustment Recorded Adjusted Balance (in thousands) Prepaid expenses and other current assets $ 155,012 $ (378 ) $ 154,634 Operating lease right-of-use assets — 210,914 210,914 Other long-term assets 50,927 (28 ) 50,899 Other accrued liabilities 55,896 14,500 70,396 Operating lease liabilities — 242,916 242,916 Other long-term liabilities 56,257 (46,908 ) 9,349

Short-Term and Long-Term Inve_2

Short-Term and Long-Term Investments (Tables)	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Short-term and Long-term Investments	The following tables present our short-term and long-term investments in available-for-sale securities based on remaining contractual years to maturity: June 30, 2019 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments Commercial paper $ 33,234 $ — $ — $ 33,234 U.S. treasury securities 328,308 376 (29 ) 328,655 U.S. agency securities 22,720 9 (3 ) 22,726 Corporate bonds 106,298 136 (10 ) 106,424 Total short-term investments 490,560 521 (42 ) 491,039 Long-term investments Corporate bonds 24,424 124 — 24,548 Total long-term investments 24,424 124 — 24,548 Total short-term and long-term investments $ 514,984 $ 645 $ (42 ) $ 515,587 December 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments Commercial paper $ 7,949 $ — $ — $ 7,949 U.S. treasury securities 206,486 24 (457 ) 206,053 U.S. agency securities 18,576 — (61 ) 18,515 Corporate bonds 137,119 — (281 ) 136,838 Total short-term investments 370,130 24 (799 ) 369,355 Long-term investments U.S. treasury securities 13,352 5 (50 ) 13,307 Corporate bonds 13,025 2 (56 ) 12,971 Total long-term investments 26,377 7 (106 ) 26,278 Total short-term and long-term investments $ 396,507 $ 31 $ (905 ) $ 395,633
Investments, Continuous Unrealized Loss Position, Fair Value	The following tables present the fair values and the gross unrealized losses related to our investments in available-for-sale securities that were in an unrealized loss position as of June 30, 2019 and December 31, 2018 , summarized by the length of time that the investments have been in a continuous unrealized loss position: June 30, 2019 Less Than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (in thousands) Short-term investments U.S. treasury securities $ — $ — $ 39,900 $ (29 ) $ 39,900 $ (29 ) U.S. agency securities — — 3,572 (3 ) 3,572 (3 ) Corporate bonds 4,995 (2 ) 9,263 (8 ) 14,258 (10 ) Total short-term investments 4,995 (2 ) 52,735 (40 ) 57,730 (42 ) As of June 30, 2019 , no investments classified as long-term investments were in an unrealized loss position. December 31, 2018 Less Than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses (in thousands) Short-term investments U.S. treasury securities $ 89,320 $ (143 ) $ 79,472 $ (314 ) $ 168,792 $ (457 ) U.S. agency securities — — 18,515 (61 ) 18,515 (61 ) Corporate bonds 91,455 (131 ) 45,383 (150 ) 136,838 (281 ) Total short-term investments 180,775 (274 ) 143,370 (525 ) 324,145 (799 ) Long-term investments U.S. treasury securities 9,855 (50 ) — — 9,855 (50 ) Corporate bonds 11,389 (56 ) — — 11,389 (56 ) Total long-term investments 21,244 (106 ) — — 21,244 (106 ) Total short-term and long-term investments $ 202,019 $ (380 ) $ 143,370 $ (525 ) $ 345,389 $ (905 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	The following tables present the fair value of our financial assets using the fair value hierarchy: June 30, 2019 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents Money market funds $ 458,260 $ — $ — $ 458,260 Commercial paper — 11,986 — 11,986 U.S. treasury securities — 8,041 — 8,041 U.S. agency securities — 2,497 — 2,497 Short-term investments Commercial paper — 33,234 — 33,234 U.S. treasury securities — 328,655 — 328,655 U.S. agency securities — 22,726 — 22,726 Corporate bonds — 106,424 — 106,424 Long-term investments Corporate bonds — 24,548 — 24,548 Total $ 458,260 $ 538,111 $ — $ 996,371 December 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Cash equivalents Money market funds $ 610,732 $ — $ — $ 610,732 Corporate bonds — 3,009 — 3,009 Short-term investments Commercial paper — 7,949 — 7,949 U.S. treasury securities — 206,053 — 206,053 U.S. agency securities — 18,515 — 18,515 Corporate bonds — 136,838 — 136,838 Long-term investments U.S. treasury securities — 13,307 — 13,307 Corporate bonds — 12,971 — 12,971 Total $ 610,732 $ 398,642 $ — $ 1,009,374

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lessor, Operating Lease, Payments to be Received, Maturity	The following table presents our future lease payments for long-term operating leases, net of expected sublease income, as of June 30, 2019 : Period Operating Lease Commitments Expected Sublease Receipts Net Future Operating Lease Commitments (in thousands) Remainder of 2019 $ 7,658 $ (4,980 ) $ 2,678 2020 44,059 (7,806 ) 36,253 2021 48,683 (1,208 ) 47,475 2022 48,016 (625 ) 47,391 2023 48,975 (128 ) 48,847 Thereafter 156,062 — 156,062 Total $ 353,453 $ (14,747 ) $ 338,706 Less: Imputed interest (79,778 ) Total operating lease liabilities $ 273,675
Future Lease Payments for Long-Term Operating Leases	The following table presents our future lease payments for long-term operating leases, net of expected sublease income, as of June 30, 2019 : Period Operating Lease Commitments Expected Sublease Receipts Net Future Operating Lease Commitments (in thousands) Remainder of 2019 $ 7,658 $ (4,980 ) $ 2,678 2020 44,059 (7,806 ) 36,253 2021 48,683 (1,208 ) 47,475 2022 48,016 (625 ) 47,391 2023 48,975 (128 ) 48,847 Thereafter 156,062 — 156,062 Total $ 353,453 $ (14,747 ) $ 338,706 Less: Imputed interest (79,778 ) Total operating lease liabilities $ 273,675
Supplemental Balance Sheet Information - Operating Leases	The following table presents supplemental balance sheet information related to leases as of June 30, 2019 : June 30, 2019 (dollars in thousands) Other accrued liabilities $ 15,693 Operating lease liabilities 257,982 Total operating lease liabilities $ 273,675 Weighted average remaining lease term (in years) 7.8 Weighted average discount rate 6.1 %
Components of Lease Expense	The components of our lease expense for the six months ended June 30, 2019 were as follows: Six Months Ended (in thousands) Operating lease costs $ 23,166 Variable lease costs 7,333 Short-term lease costs 3,538 Sublease income (4,710 ) Total lease cost, net $ 29,327

Business Combination Business C

Business Combination Business Combination (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Purchase Price Allocation	The following table summarizes the purchase price allocation based on the estimated fair value of the net assets acquired: June 7, 2018 (in thousands) Cash $ 53 Technology asset 3,500 Goodwill 7,447 Net assets acquired $ 11,000

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Deferred Contract Costs	The following table presents the activity impacting our deferred contract costs during the six months ended June 30, 2019 : Deferred Contract Costs (in thousands) Balance at December 31, 2018 $ 51,401 Additional contract costs deferred 19,414 Amortization of deferred contract costs (9,512 ) Balance at June 30, 2019 $ 61,303
Contract with Customer, Asset and Liability	The following table presents the activity impacting our contract assets during the six months ended June 30, 2019 : Contract Assets (in thousands) Balance at December 31, 2018 $ 105,593 Contract assets transferred to receivables (41,640 ) Additions to contract assets 66,798 Balance at June 30, 2019 $ 130,751 Contract assets are included in prepaid expenses and other current assets. There were no material impairments of contract assets during the six months ended June 30, 2019 . The following table presents the activity impacting our deferred revenue balances during the six months ended June 30, 2019 : Deferred Revenue (in thousands) Balance at December 31, 2018 $ 394,198 Deferred revenue recognized (251,413 ) Additional amounts deferred 251,738 Balance at June 30, 2019 $ 394,523

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity	A summary of the option activity during the six months ended June 30, 2019 follows: Options Outstanding Shares Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (in years) (in thousands) Balances at December 31, 2018 1,919,383 $ 10.44 Options exercised (1,004,153 ) 7.69 Balances at June 30, 2019 915,230 $ 13.47 3.17 $ 139,621 Vested and expected to vest at June 30, 2019 915,230 $ 13.47 3.17 $ 139,621 Exercisable at June 30, 2019 891,792 $ 12.38 3.07 $ 137,016
Summary of RSU Activity	A summary of the RSU activity, including RSU awards subject to technology milestones, during the six months ended June 30, 2019 follows: Number of Shares Underlying Outstanding RSUs Weighted Average Grant-Date Fair Value per RSU Non-Vested outstanding at December 31, 2018 7,194,454 $ 77.66 RSUs granted 2,160,857 127.34 RSUs vested (1,605,125 ) 73.84 RSUs forfeited (433,155 ) 80.42 Non-Vested outstanding at June 30, 2019 7,317,031 $ 93.01
Summary of Shares Available for Grant	The summary of shares available for issuance of equity-based awards (including stock options, RSUs, including RSU awards subject to technology milestones or other performance conditions, and shares issuable under our 2013 ESPP) during the six months ended June 30, 2019 follows: Shares Available for Grant 2013 Plan 2013 ESPP Balances at December 31, 2018 7,687,965 3,979,544 Authorized 4,217,847 843,569 Granted (2,231,736 ) (232,090 ) Forfeited 433,155 — Balances at June 30, 2019 10,107,231 4,591,023

Segments and Information abou_2

Segments and Information about Revenues by Geographic Region (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Reconciliation of Revenue by Geographic Area	The following table presents our revenues by geographic region of end users who purchased products or services for the periods presented below: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands) United States and Canada $ 224,772 $ 196,992 $ 421,674 $ 364,791 International 97,332 85,297 182,890 163,705 Total revenues $ 322,104 $ 282,289 $ 604,564 $ 528,496

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Schedule of Net Loss Per Share, Basic and Diluted	The following table presents the computation of basic and diluted net loss per share for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands, except per share amounts) Net loss per share - basic and diluted Net loss $ (35,518 ) $ (12,066 ) $ (124,400 ) $ (58,538 ) Weighted average shares outstanding used to compute basic and diluted net loss per share 86,711 82,247 86,076 81,647 Net loss per share - basic and diluted $ (0.41 ) $ (0.15 ) $ (1.45 ) $ (0.72 )
Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share	The following table presents shares which were excluded from the computation of diluted net loss per share for the periods presented as their effect would have been antidilutive: Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 (in thousands) Shares subject to outstanding common stock awards 8,425 10,078 8,425 10,078

Description of Business Narrati

Description of Business Narrative (Details) $ in Millions	Jul. 03, 2019	Jun. 30, 2019USD ($)product
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of key products | product		5
Subsequent Event [Line Items]
Potential termination fee | $		$ 552
Subsequent Event [Member]
Subsequent Event [Line Items]
Conversion ratio	1.103

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)segment	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Accounting Policies [Abstract]
Number of Operating Segments | segment	1
New Accounting Pronouncements or Change in Accounting Principle
Prepaid expenses and other current assets	$ 187,027	$ 154,634	$ 155,012
Operating lease right-of-use assets	221,606	210,914	0
Other long-term assets	57,916	50,899	50,927
Other accrued liabilities	80,676	70,396	55,896
Operating lease liabilities	257,982	242,916	0
Other long-term liabilities	$ 10,286	9,349	$ 56,257
Prepaid expenses and other current assets | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		(378)
Operating lease right-of-use assets | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		210,914
Other long-term assets | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		(28)
Other accrued liabilities | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		14,500
Operating lease liabilities | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		242,916
Other long-term liabilities | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (46,908)

Short-Term and Long-Term Inve_3

Short-Term and Long-Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Short-Term and Long-Term Investments
Amortized Cost	$ 514,984	$ 396,507
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	645	31
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(42)	(905)
Fair Value	515,587	395,633
Short-term investments
Schedule of Short-Term and Long-Term Investments
Amortized Cost	490,560	370,130
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	521	24
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(42)	(799)
Fair Value, short-term	491,039	369,355
Short-term investments | Commercial Paper, Not Included with Cash and Cash Equivalents
Schedule of Short-Term and Long-Term Investments
Amortized Cost	33,234	7,949
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Fair Value, short-term	33,234	7,949
Short-term investments | U.S. treasury securities
Schedule of Short-Term and Long-Term Investments
Amortized Cost	328,308	206,486
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	376	24
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(29)	(457)
Fair Value, short-term	328,655	206,053
Short-term investments | U.S. agency securities
Schedule of Short-Term and Long-Term Investments
Amortized Cost	22,720	18,576
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3)	(61)
Fair Value, short-term	22,726	18,515
Short-term investments | Corporate bonds
Schedule of Short-Term and Long-Term Investments
Amortized Cost	106,298	137,119
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	136	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(10)	(281)
Fair Value, short-term	106,424	136,838
Long-term investments
Schedule of Short-Term and Long-Term Investments
Amortized Cost	24,424	26,377
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	124	7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(106)
Fair Value, long-term	24,548	26,278
Long-term investments | U.S. treasury securities
Schedule of Short-Term and Long-Term Investments
Amortized Cost		13,352
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(50)
Fair Value, long-term		13,307
Long-term investments | Corporate bonds
Schedule of Short-Term and Long-Term Investments
Amortized Cost	24,424	13,025
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	124	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(56)
Fair Value, long-term	$ 24,548	$ 12,971

Short-Term and Long-Term Inve_4

Short-Term and Long-Term Investments Schedule of Investments in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 202,019
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(380)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		143,370
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(525)
Debt Securities, Available-for-sale, Unrealized Loss Position		345,389
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(905)
Short-term investments
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,995	180,775
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2)	(274)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	52,735	143,370
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(40)	(525)
Debt Securities, Available-for-sale, Unrealized Loss Position	57,730	324,145
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(42)	(799)
Short-term investments | U.S. treasury securities
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	89,320
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(143)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	39,900	79,472
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(29)	(314)
Debt Securities, Available-for-sale, Unrealized Loss Position	39,900	168,792
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(29)	(457)
Short-term investments | U.S. agency securities
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,572	18,515
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3)	(61)
Debt Securities, Available-for-sale, Unrealized Loss Position	3,572	18,515
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(3)	(61)
Short-term investments | Corporate bonds
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4,995	91,455
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2)	(131)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,263	45,383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(8)	(150)
Debt Securities, Available-for-sale, Unrealized Loss Position	14,258	136,838
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (10)	(281)
Long-term investments
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		21,244
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(106)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Available-for-sale, Unrealized Loss Position		21,244
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(106)
Long-term investments | U.S. treasury securities
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		9,855
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(50)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Available-for-sale, Unrealized Loss Position		9,855
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(50)
Long-term investments | Corporate bonds
Schedule of Short-Term and Long-Term Investments
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		11,389
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(56)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Available-for-sale, Unrealized Loss Position		11,389
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ (56)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	$ 996,371	$ 1,009,374
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	458,260	610,732
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	538,111	398,642
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	0	0
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	458,260	610,732
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	458,260	610,732
Commercial Paper, Not Included with Cash and Cash Equivalents | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	33,234	7,949
Commercial Paper, Not Included with Cash and Cash Equivalents | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	33,234	7,949
U.S. treasury securities | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	8,041
U.S. treasury securities | Cash Equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	8,041
U.S. treasury securities | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	328,655	206,053
U.S. treasury securities | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	328,655	206,053
U.S. treasury securities | Long-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value		13,307
U.S. treasury securities | Long-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value		13,307
U.S. agency securities | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	2,497
U.S. agency securities | Cash Equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	2,497
U.S. agency securities | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	22,726	18,515
U.S. agency securities | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	22,726	18,515
Corporate bonds | Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	11,986	3,009
Corporate bonds | Cash Equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	11,986	3,009
Corporate bonds | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	106,424	136,838
Corporate bonds | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	106,424	136,838
Corporate bonds | Long-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	24,548	12,971
Corporate bonds | Long-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments Fair Value	$ 24,548	$ 12,971

Leases Maturity of Leases (Deta

Leases Maturity of Leases (Details) $ in Thousands	Jun. 30, 2019USD ($)
Operating Lease Liabilities, Payments, Due, Rolling Maturity [Abstract]
Operating Lease Commitments, Remainder of 2019	$ 7,658
Operating Lease Commitments, 2020	44,059
Operating Lease Commitments, 2021	48,683
Operating Lease Commitments, 2022	48,016
Operating Lease Commitments, 2023	48,975
Operating lease Commitments, Thereafter	156,062
Operating Lease Commitments, Undiscounted Total	353,453
Less: Imputed interest	(79,778)
Total operating lease liabilities	273,675
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Expected Sublease Receipts, Remainder of 2019	(4,980)
Expected Sublease Receipts, 2020	(7,806)
Expected Sublease Receipts, 2021	(1,208)
Expected Sublease Receipts, 2022	(625)
Expected Sublease Receipts, 2023	(128)
Expected Sublease Receipts, Thereafter	0
Expected Sublease Receipts, Total	(14,747)
Operating Lease Liabilities, Payments Due [Abstract]
Net Future Operating Lease Commitments, Remainder of 2019	2,678
Net Future Operating Lease Commitments, 2020	36,253
Net Future Operating Lease Commitments, 2021	47,475
Net Future Operating Lease Commitments, 2022	47,391
Net Future Operating Lease Commitments, 2023	48,847
Net Future Operating Lease Commitments, Thereafter	156,062
Net Future Operating Lease Commitments, Total	$ 338,706

Leases Supplemental Cash Flow I

Leases Supplemental Cash Flow Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Abstract]
Cash paid for operating lease liabilities	$ 22.8
Non-cash increases to our operating lease right-of-use assets and operating lease liabilities as a result of leases that commenced or were modified	$ 25.2

Leases Entered Into But Not Yet

Leases Entered Into But Not Yet Commenced (Details) $ in Millions	Jun. 30, 2019USD ($)
Operating Leases
Operating Leases Signed Not Yet Commenced, Value	$ 12.9
Minimum [Member]
Operating Leases
Operating Leases SIgned Not Yet Commenced, Term	13 months
Maximum
Operating Leases
Operating Leases SIgned Not Yet Commenced, Term	7 years

Leases Supplemental Balance She

Leases Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Other accrued liabilities	$ 15,693
Operating lease liabilities	257,982	$ 242,916	$ 0
Total operating lease liabilities	$ 273,675
Weighted average remaining lease term (in years)	7 years 9 months 18 days
Weighted average discount rate	6.10%

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease costs	$ 23,166
Variable lease costs	7,333
Short-term lease costs	3,538
Sublease Income	(4,710)
Total lease cost, net	$ 29,327
Operating Leases, Rent Expense under ASC 840		$ 17,100

Stockholders' Equity (Details)

Stockholders' Equity (Details)	3 Months Ended			6 Months Ended
	Mar. 31, 2019USD ($)shares	Jun. 30, 2018USD ($)shares	Mar. 31, 2018USD ($)shares	Jun. 30, 2019USD ($)voting_right$ / sharesshares	Jun. 30, 2018USD ($)$ / sharesshares	Dec. 31, 2018$ / sharesshares	Apr. 26, 2018USD ($)	Nov. 01, 2016USD ($)
Class of Stock
Preferred Stock, Shares outstanding				0		0
Preferred Stock, Shares Authorized				10,000,000		10,000,000
Preferred Stock, Par Value (in usd per share) | $ / shares				$ 0.0001		$ 0.0001
Stock Issued During Period, Shares, Shares Donated				209,384
Stock Issued During Period, Value, Shares Donated | $				$ 24,200,000
Stock Repurchase Program, Authorized Amount | $								$ 200,000,000
Stock Repurchase Program, Increase to Authorized Amount | $							$ 300,000,000
Stock Repurchased and Retired During Period, Shares	34,986	312,921	366,160	34,986	679,081
Stock Repurchased, Average Cost Per Share | $ / shares				$ 123.64	$ 88.37
Stock Repurchased and Retired During Period, Value | $	$ 4,326,000	$ 30,006,000	$ 30,007,000	$ 4,300,000	$ 60,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $				$ 275,700,000
Class B common stock
Class of Stock
Common Stock, Shares Authorized				75,000,000		75,000,000
Common Stock, Par Value (in usd per share) | $ / shares				$ 0.0001		$ 0.0001
Common Stock, Voting Right | voting_right				10,000
Class A common stock
Class of Stock
Common Stock, Shares Authorized				750,000,000		750,000,000
Common Stock, Par Value (in usd per share) | $ / shares				$ 0.0001		$ 0.0001
Common Stock, Voting Right | voting_right				1

Business Combination (Details)

Business Combination (Details) - USD ($) $ in Thousands	Jun. 07, 2018	Jun. 30, 2019	Dec. 31, 2018
Business Acquisition
Technology asset amortization period	5 years
Goodwill		$ 45,430	$ 42,530
Empirical Systems
Business Acquisition
Payments to Acquire Businesses, Gross	$ 11,000
Cash	53
Technology asset	3,500
Goodwill	7,447
Net assets acquired	$ 11,000

Revenue (Details)

Revenue (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Threshold for Asset Recognition From Costs of Obtaining a Contract	1 year
Amortization period, deferred commissions	4 years
Deferred Contract Costs, Current	$ 21.4

Revenue (Contract Assets) (Deta

Revenue (Contract Assets) (Details) - Contract Assets $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Contract Asset Rollforward
Balance at December 31, 2018	$ 105,593
Contract assets transferred to receivables	(41,640)
Additions to contract assets	66,798
Balance at March 31, 2019	$ 130,751

Revenue (Deferred Revenue) (Det

Revenue (Deferred Revenue) (Details) - Deferred Revenue $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Deferred Revenue Rollforward
Balance at December 31, 2018	$ 394,198
Deferred revenue recognized	(251,413)
Additional amounts deferred	251,738
Balance at June 30, 2019	$ 394,523

Revenue (Deferred Contract Cost

Revenue (Deferred Contract Costs) (Details) - Deferred Commissions $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Deferred Contract Costs
Balance at December 31, 2018	$ 51,401
Additional contract costs deferred	19,414
Amortization of deferred contract costs	(9,512)
Balance at June 30, 2019	$ 61,303

Revenue (Performance Obligation

Revenue (Performance Obligations) (Details) $ in Millions	Jun. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, Remaining Performance Obligation, Amount	$ 276.6
Recognized Over Next 24 Months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, Remaining Performance Obligation, Amount	$ 234.1

Stock-Based Compensation (Detai

Stock-Based Compensation (Details - Narrative) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Option expiration period (in years)	10 years
Vesting period (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation expense	$ 625
Recognition period (in years)	3 years
2013 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payroll Deduction, Percent	15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Purchase Period	6 months
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%

Stock-Based Compensation (Det_2

Stock-Based Compensation (Details - Options) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares
Shares
Options Outstanding, Shares, Beginning of Period | shares	1,919,383
Options Outstanding, Shares, Options Exercised | shares	(1,004,153)
Options Outstanding, Shares, End of Period | shares	915,230
Options Outstanding, Shares, Vested and Expected to Vest | shares	915,230
Options Outstanding, Shares, Exercisable | shares	891,792
Weighted Average Exercise Price per Share
Options Outstanding, Weighted Average Exercise Price, Beginning of Period, USD per Share | $ / shares	$ 10.44
Options Outstanding, Weighted Average Exercise Price, Options Exercised, USD per Share | $ / shares	7.69
Options Outstanding, Weighted Average Exercise Price, End of Period, USD per Share | $ / shares	13.47
Options Outstanding, Weighted Average Exercise Price Per Share, Vested and Expected to Vest, USD per Share | $ / shares	13.47
Options Outstanding, Weighted Average Exercise Price Per Share, Exercisable, USD per Share | $ / shares	$ 12.38
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Outstanding, Weighted Average Remaining Contractual Term, End of Period (in years)	3 years 2 months 1 day
Options Outstanding, Weighted Average Remaining Contractual Term, Vested and Expected to Vest (in years)	3 years 2 months 1 day
Options Outstanding, Weighted Average Remaining Contractual Term, Exercisable (in years)	3 years 25 days
Options Outstanding, Aggregate Intrinsic Value, End of Period | $	$ 139,621
Options Outstanding, Aggregate Intrinsic Value, Vested and Expected to Vest | $	139,621
Options Outstanding, Aggregate Intrinsic Value, Exercisable | $	$ 137,016

Stock Based Compensation (Detai

Stock Based Compensation (Details - RSUs)	6 Months Ended
	Jun. 30, 2019$ / sharesshares
RSUs
Number of Shares Underlying Outstanding RSUs
RSU Shares Outstanding, Beginning of Period	7,194,454
RSUs granted, Shares	2,160,857
RSUs vested, Shares	(1,605,125)
RSUs forfeited, Shares	(433,155)
RSU Shares Outstanding, End of Period	7,317,031
Weighted Average Grant-Date Fair Value per RSU
Weighted Average Fair Value, Beginning of Period, USD per Share | $ / shares	$ 77.66
Weighted Average Fair Value, RSUs Granted, USD per Share | $ / shares	127.34
Weighted Average Fair Value, RSUs Vested, USD per Share | $ / shares	73.84
Weighted Average Fair Value, RSUs Forfeited, USD per Share | $ / shares	80.42
Weighted Average Fair Value, End of Period, USD per Share | $ / shares	$ 93.01
Maximum | Performance Shares Subject to Performance Conditions Other Than Technology Milestones
Number of Shares Underlying Outstanding RSUs
RSUs granted, Shares	70,879

Stock-Based Compensation (Det_3

Stock-Based Compensation (Details - Shares Available)	6 Months Ended
	Jun. 30, 2019shares
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards, Outstanding [Roll Forward]
Equity Based Awards, Beginning of Period, Shares	7,687,965
Authorized, Shares	4,217,847
Granted, Shares	(2,231,736)
Forfeited, Shares	433,155
Equity Based Awards, End of Period, Shares	10,107,231
2013 ESPP | Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards, Outstanding [Roll Forward]
Equity Based Awards, Beginning of Period, Shares	3,979,544
Authorized, Shares	843,569
Granted, Shares	(232,090)
Forfeited, Shares	0
Equity Based Awards, End of Period, Shares	4,591,023

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 3,164	$ (2,033)	$ 4,052	$ (4,478)
Effective tax rate	(9.80%)	14.40%	(3.40%)	7.10%

Segments and Information abou_3

Segments and Information about Revenues by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information
Total revenues	$ 322,104	$ 282,289	$ 604,564	$ 528,496
United States and Canada
Segment Reporting Information
Total revenues	224,772	196,992	421,674	364,791
International
Segment Reporting Information
Total revenues	$ 97,332	$ 85,297	$ 182,890	$ 163,705

Net Income (Loss) Per Share (De

Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss per share - basic and diluted
Net loss	$ (35,518)	$ (88,882)	$ (12,066)	$ (46,472)	$ (124,400)	$ (58,538)
Weighted average shares outstanding used to compute basic and diluted net loss per share	86,711		82,247		86,076	81,647
Net loss per share - basic and diluted (in usd per share)	$ (0.41)		$ (0.15)		$ (1.45)	$ (0.72)
Antidilutive shares excluded from computation of diluted net loss	8,425		10,078		8,425	10,078

Uncategorized Items - a10qq2201

Label	Element	Value
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 166,089,000
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	164,406,000
Accounting Standards Update 2014-09 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 1,683,000