Tableau Software 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Statement - shares	3 Months Ended
	Mar. 31, 2018	May 02, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Entity Registrant Name	TABLEAU SOFTWARE INC
Entity Central Index Key	1,303,652
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		67,911,962
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		13,631,046

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current liabilities
Accounts payable	$ 2,817	$ 4,448
Accrued compensation and employee-related benefits	81,268	96,390
Other accrued liabilities	41,935	37,722
Income taxes payable	4,467	4,743
Deferred revenue	314,698	419,426
Total current liabilities	445,185	562,729
Deferred revenue	21,687	28,058
Other long-term liabilities	53,911	54,385
Total liabilities	520,783	645,172
Commitments and contingencies (Note 9)
Stockholders' equity
Preferred stock, $0.0001 par value, 10,000,000 shares authorized; none issued	0	0
Additional paid-in capital	1,205,459	1,168,563
Accumulated other comprehensive loss	(10,571)	(11,991)
Accumulated deficit	(285,023)	(402,957)
Total stockholders' equity	909,873	753,623
Total liabilities and stockholders' equity	1,430,656	1,398,795
Current assets
Cash and cash equivalents	623,994	627,878
Short-term investments	241,652	226,787
Accounts receivable, net of allowance for doubtful accounts of $972 and $1,003	132,611	203,366
Prepaid expenses and other current assets	(98,461)	(30,514)
Income taxes receivable	883	673
Total current assets	1,097,601	1,089,218
Long-term investments	157,497	148,364
Property and equipment, net	101,121	106,753
Goodwill	35,083	35,083
Deferred income taxes	4,215	5,287
Other long-term assets	35,139	14,090
Total assets	1,430,656	1,398,795
Common stock	8	8
Class B common stock
Current assets
Common stock	1	1
Class A common stock
Current assets
Common stock	$ 7	$ 7

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets Balance Sheet Parenthetical - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 972	$ 1,003
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	13,631,046	14,492,846
Common Stock, Shares Outstanding	13,631,046	14,492,846
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	67,904,088	65,969,499
Common Stock, Shares Outstanding	67,904,088	65,969,499

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
License	$ 108,793	$ 97,244
Maintenance and services	137,414	102,662
Total revenues	246,207	199,906
Cost of revenues
License	3,954	3,267
Maintenance and services	28,471	23,388
Total cost of revenues	32,425	26,655
Gross profit	213,782	173,251
Operating expenses
Sales and marketing	138,406	118,018
Research and development	93,505	84,302
General and administrative	32,250	24,445
Total operating expenses	264,161	226,765
Operating loss	(50,379)	(53,514)
Other income, net	1,462	1,225
Loss before income tax expense (benefit)	(48,917)	(52,289)
Income tax expense (benefit)	(2,445)	2,358
Net loss	$ (46,472)	$ (54,647)
Net loss per share:
Basic	$ (0.57)	$ (0.71)
Diluted	$ (0.57)	$ (0.71)
Weighted average shares used to compute net loss per share:
Basic (shares)	81,039	77,416
Diluted (shares)	81,039	77,416

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Operations Parenthetical - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cost of revenues
Stock-based Compensation Expense	$ 2,987	$ 2,577
Sales and marketing
Stock-based Compensation Expense	20,015	18,092
Research and development
Stock-based Compensation Expense	25,157	23,515
General and administrative
Stock-based Compensation Expense	$ 7,604	$ 5,011

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Loss Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (46,472)	$ (54,647)
Other comprehensive income (loss), net of tax:
Foreign currency translation	586	(824)
Net unrealized loss on available-for-sale securities	(849)	0
Comprehensive loss	$ (46,735)	$ (55,471)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net loss	$ (46,472)	$ (54,647)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	9,647	13,435
Amortization of premiums on investments, net	118	0
Stock-based compensation expense	55,763	49,195
Deferred income taxes	(4,226)	128
Changes in operating assets and liabilities
Accounts receivable, net	73,012	76,878
Prepaid expenses and other assets	(22,891)	11,270
Income taxes receivable	(194)	6
Deferred revenue	(7,507)	4,008
Accounts payable and accrued liabilities	(4,279)	(16,620)
Income taxes payable	(356)	842
Net cash provided by operating activities	52,615	84,495
Investing activities
Purchases of property and equipment	(5,251)	(23,238)
Purchases of investments	(102,450)	0
Maturities of investments	77,385	0
Sales of investments	99	0
Net cash used in investing activities	(30,217)	(23,238)
Financing activities
Proceeds from issuance of common stock	2,492	4,309
Repurchases of common stock	(30,007)	(20,008)
Net cash used in financing activities	(27,515)	(15,699)
Effect of exchange rate changes on cash and cash equivalents	1,233	374
Net increase (decrease) in cash and cash equivalents	(3,884)	45,932
Cash and cash equivalents
Beginning of period	627,878	908,717
End of period	623,994	954,649
Non-cash activities
Accrued purchases of property and equipment	$ 4,192	$ 8,039

Description of Business

Description of Business	3 Months Ended
	Mar. 31, 2018
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 four 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; and Tableau Public, a free cloud-based platform for analyzing and sharing public data.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
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 Securities and Exchange Commission ("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, 2017 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, 2017 filed with the SEC on February 26, 2018 . In the opinion of management, the accompanying unaudited condensed consolidated financial information includes all normal recurring adjustments necessary for a fair statement of the Company's financial position, results of operations, comprehensive loss and cash flows for the interim periods, but is not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . All intercompany accounts and transactions have been eliminated in consolidation. We adopted the new revenue recognition accounting standard Accounting Standards Codification (“ASC”) 606 effective January 1, 2018 on a modified retrospective basis (see Recently Adopted Accounting Pronouncements ). Financial results for reporting periods during 2018 are presented in compliance with the new revenue recognition standard. Historical financial results for reporting periods prior to 2018 are presented in conformity with amounts previously disclosed under the prior revenue recognition standard ASC 605. These financial statements include additional information regarding the impacts from the adoption of the new revenue recognition standard on our financial results for the three months ended March 31, 2018 . This includes the presentation of financial results during 2018 under ASC 605 for comparison to the prior year. 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 useful lives of our property and equipment and other lease-related assets, liabilities and costs; the benefit period for deferred commissions; the valuation of investments and the determination of other-than-temporary impairments; 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 and our ability to attract new customers and expand sales to existing customers, 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 established annual and interim reporting standards for an enterprise's operating segments and related disclosures about its 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 Interim Chief Financial Officer, who review financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources. Revenue Recognition - ASC 606 We generate revenues primarily in the form of software license fees and related maintenance and services fees. Software license revenues include fees from the sales of perpetual, term and subscription licenses. Maintenance and services revenues primarily consist of fees for maintenance services (including support and unspecified upgrades and enhancements when and if they are available), training and professional services. We recognize revenues related to our contracts with customers based on the following criteria: • the contract contains reasonable evidence of approval and both parties' commitment to perform their respective obligations; • the contract includes identifiable rights to goods and services to be transferred and payment terms related to the transfer of those goods and services; • the contract has commercial substance; and • collection of substantially all of the consideration we are entitled to under the contract is probable. We identify performance obligations in our contracts with customers, which may include software licenses and/or related maintenance and services. We determine the transaction price based on the amount we expect to be entitled to in exchange for transferring the promised goods or services to the customer. We allocate the transaction price in the contract to each distinct performance obligation in an amount that depicts the relative amount of consideration we expect to receive in exchange for satisfying each performance obligation. Revenue is recognized when performance obligations are satisfied. Our contract payment terms are typically net 30 days . We assess collectability based on a number of factors including collection history and creditworthiness of the customer, and we may mitigate exposures to credit risk by requiring payments in advance. If we determine that collectability related to a contract is not probable, we may not record revenue until collectability becomes probable at a later date. Our revenues are recorded based on the transaction price excluding amounts collected on behalf of third parties such as sales taxes, which are collected on behalf of and remitted to governmental authorities. Nature of Products and Services Our on-premises software licenses are sold both perpetually and through term-based license agreements. These licensing arrangements provide customers with the same product functionality and differ mainly in the duration over which the customer benefits from the software. We deliver our software licenses electronically. Electronic delivery occurs when we provide the customer with access to the software and license key via a secure portal. Revenue from on-premises software licenses is generally recognized upfront at the point in time when the software is made available to the customer. When purchasing an on-premises software license, a customer typically bundles with a maintenance services agreement and may also purchase training and/or professional services. Maintenance services agreements consist of fees for providing software updates on a when and if available basis and for providing technical support for software products for a specified term. We believe that our when and if available software updates and technical support each have the same pattern of transfer to the customer and are substantially the same. Therefore, we consider these to be a single distinct performance obligation. Revenues allocated to maintenance services are recognized ratably as the services are provided. Revenues related to training services are billed on a fixed fee basis and are recognized as the services are delivered. Payments received in advance of services performed are deferred and recognized when the related services are performed. Revenues related to professional services are billed on a time and materials basis and are recognized as the services are performed. We also provide cloud-based subscriptions, which allow customers to access our software during a contractual period without taking possession of the software. We recognize revenue related to these cloud-based subscriptions ratably over the life of the subscription agreement beginning when the customer first has access to the software. Revenues from our cloud-based subscriptions are included in license revenues. Judgments and Estimates Our contracts with customers often include promises to transfer multiple products and services. Determining whether products and services are considered distinct performance obligations that should be accounted for separately from one another sometimes requires judgment. Judgment is required to determine standalone selling prices (“SSP”) for each distinct performance obligation. We typically have more than one SSP for each of our products and services based on customer stratification, which is based on the size of the customer, their geographic region and market segment. We use other comparable software license sales to determine SSPs for perpetual software licenses. For our cloud-based subscriptions and for maintenance services, training and professional services, SSPs are generally observable using standalone sales and/or renewals. Our on-premises term-based software licenses generally do not have directly observable inputs for determining SSP. Therefore, we determine SSP using other observable inputs including customer buying patterns, renewal rates, cumulative spend comparisons and other industry data. We evaluate contracts that include options to purchase additional goods or services to determine whether or not the options give rise to a separate performance obligation that is material. If we determine the options are material, the revenue allocated to such options is not recognized until the option is exercised or the option expires. Our revenue recognition accounting policy for ASC 605 is included in our Annual Report on Form 10-K for the year ended December 31, 2017, which was filed with the SEC on February 26, 2018. We applied the revenue recognition accounting policy for ASC 605 to our disclosures in Note 6, which include amounts presented for 2018. There were no changes to the ASC 605 policy during the first quarter of 2018. Assets Recognized from the Costs to Obtain a Contract with a Customer 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 have determined that certain costs related to our sales incentive programs meet the requirements to be capitalized and deferred. Assets recorded are included in other current assets and other long-term assets. We amortize these deferred costs proportionate with related revenues over four years, which is generally longer than the term of the initial contract because of anticipated renewals as sales commissions for renewals are not commensurate with sales commissions related to our initial contracts. Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash and cash equivalents, investments and accounts receivable. Our investment portfolio consists of investment-grade securities diversified among security types, industries and issuers. Our cash and cash equivalents and investments are held and managed by recognized financial institutions that follow our investment policy. 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 March 31, 2018 and December 31, 2017 , no individual customer accounted for 10% or more of total accounts receivable. For the three months ended March 31, 2018 and 2017 , no individual customer represented 10% or more of our total revenues. Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09 related to revenue recognition and later issued additional ASUs including ASU 2016-08, ASU 2016-10, ASU 2016-12, ASU 2016-20 and ASU 2017-14, all of which clarified certain aspects of ASU 2014-09, and together with ASU 2014-09, which we refer to collectively as the new revenue recognition standard. The new revenue recognition standard changed the way we recognize revenue, including the identification of contractual performance obligations and the allocation of transaction price, to depict the transfer of promised goods or services to customers at the amount that reflects the consideration to which we expect to be entitled in exchange for those goods or services. We adopted the new revenue recognition standard in the first quarter of 2018 on a modified retrospective basis and applied the new revenue recognition standard only to contracts that were not completed contracts prior to January 1, 2018. Upon adoption, we recorded an adjustment of $146.8 million to our accumulated deficit. The adjustment was offset by a $105.9 million reduction to deferred revenue, which was primarily related to on-premises term licenses, and the addition of a $40.9 million contract asset. The new revenue recognition standard materially impacts the timing of revenue recognition related to our on-premises term license agreements. Prior to our adoption of the new revenue recognition standard, we historically recognized revenue related to on-premises term license agreements ratably over the term of the licensing agreement. Under the new revenue recognition standard, revenue allocable to the license portion of the arrangement is recognized upon delivery of the license. Maintenance revenue related to on-premises term license agreements continue to be recognized ratably over the term of the licensing agreement. Under the new revenue recognition standard, we allocate total transaction price to performance obligations based on estimated standalone selling prices, which impacts the timing of revenue recognition depending on when each performance obligation is recognized. These impacts to the timing of revenue recognition also affect our deferred revenue balances. The new revenue recognition standard requires the capitalization of certain incremental costs of obtaining a contract, which impacts the period in which we record our sales commissions expense. Prior to our adoption of the new revenue recognition standard, we recognized sales commissions expense as incurred. Under the new revenue recognition standard, we are required to recognize these expenses over the period of benefit associated with these costs. This results in a deferral of sales commissions expense each period. Upon adoption, we reduced our accumulated deficit by $25.5 million and recognized an offsetting asset for deferred sales commissions related to contracts that were not completed contracts prior to January 1, 2018. For further discussion regarding the impacts of adopting the new revenue recognition standard, see Note 6. In October 2016, the FASB issued ASU 2016-16 related to the accounting for income tax effects on intra-entity asset transfers of assets other than inventory. The new guidance requires reporting entities to recognize tax expense from the sale of assets when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in consolidation. We adopted the new standard in the first quarter of 2018 on a modified retrospective basis. The adoption resulted in the recognition of a U.S. deferred tax asset, which was fully offset by a corresponding increase to the valuation allowance on our U.S. federal and state deferred income tax assets, and therefore did not have a material impact on our consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU 2016-02 related to lease accounting. The new guidance will require lessees to recognize right-of-use assets and lease liabilities on the balance sheet for operating leases that do not meet the definition of a short-term lease. ASU 2016-02 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2018 and requires modified retrospective transition. Under the new standard we anticipate that our current real estate leases will continue to be classified as operating leases and a significant amount of our currently outstanding operating lease commitments will be recorded to the balance sheet as right-of-use assets with corresponding lease liabilities. Our evaluation of the new standard will extend into future periods and we will update our disclosures, including the expected impacts of the new standard, as we progress towards the required adoption date. In June 2016, the FASB issued 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. Early adoption is permitted. 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	3 Months Ended
	Mar. 31, 2018
Schedule of Available-for-sale Securities
Short-term and Long-term Investments Disclosure	Short-Term and Long-Term Investments The following tables represent our short-term and long-term investments in available-for-sale securities as of March 31, 2018 and December 31, 2017 , based on contractual years to maturity: March 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments U.S. treasury securities $ 158,727 $ — $ (255 ) $ 158,472 U.S. agency securities 21,407 — (94 ) 21,313 Corporate bonds 62,058 — (191 ) 61,867 Total short-term investments 242,192 — (540 ) 241,652 Long-term investments U.S. treasury securities 99,562 — (502 ) 99,060 U.S. agency securities 8,576 — (71 ) 8,505 Corporate bonds 50,332 — (400 ) 49,932 Total long-term investments 158,470 — (973 ) 157,497 Total short-term and long-term investments $ 400,662 $ — $ (1,513 ) $ 399,149 December 31, 2017 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments Commercial paper $ 9,970 $ — $ — $ 9,970 U.S. treasury securities 160,206 — (121 ) 160,085 U.S. agency securities 9,917 — (24 ) 9,893 Corporate bonds 46,901 3 (65 ) 46,839 Total short-term investments 226,994 3 (210 ) 226,787 Long-term investments U.S. treasury securities 79,371 — (202 ) 79,169 U.S. agency securities 18,570 — (102 ) 18,468 Corporate bonds 50,880 — (153 ) 50,727 Total long-term investments 148,821 — (457 ) 148,364 Total short-term and long-term investments $ 375,815 $ 3 $ (667 ) $ 375,151 As of March 31, 2018 and December 31, 2017 , there were no investments that had been in a net loss position for 12 months or greater. The unrealized losses on investments as of March 31, 2018 were primarily caused by increases in interest rates. None of the unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence as of March 31, 2018 .

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
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 as of March 31, 2018 and December 31, 2017 : March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Cash and cash equivalents Money market funds $ 553,667 $ — $ — $ 553,667 Short-term investments U.S. treasury securities — 158,472 — 158,472 U.S. agency securities — 21,313 — 21,313 Corporate bonds — 61,867 — 61,867 Long-term investments U.S. treasury securities — 99,060 — 99,060 U.S. agency securities — 8,505 — 8,505 Corporate bonds — 49,932 — 49,932 Total $ 553,667 $ 399,149 $ — $ 952,816 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Cash and cash equivalents Money market funds $ 582,835 $ — $ — $ 582,835 Commercial paper — 8,984 — 8,984 Short-term investments Commercial paper — 9,970 — 9,970 U.S. treasury securities — 160,085 — 160,085 U.S. agency securities — 9,893 — 9,893 Corporate bonds — 46,839 — 46,839 Long-term investments U.S. treasury securities — 79,169 — 79,169 U.S. agency securities — 18,468 — 18,468 Corporate bonds — 50,727 — 50,727 Total $ 582,835 $ 384,135 $ — $ 966,970 We did not have any investments in prime money market funds as of March 31, 2018 . We had no financial assets or liabilities measured using Level 3 inputs as of March 31, 2018 and December 31, 2017 .

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
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 March 31, 2018 and December 31, 2017 , no shares of preferred stock were outstanding. 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. 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. During the three months ended March 31, 2018 , we repurchased 366,160 shares of our outstanding Class A common stock at an average price of $81.95 per share for $30.0 million . During the three months ended March 31, 2017 , we repurchased 383,411 shares of our outstanding Class A common stock at an average price of $52.18 per share for $20.0 million . All repurchases were made in open market transactions using cash on hand, and all of the shares repurchased were retired. As of March 31, 2018 , we were authorized to repurchase a remaining $70.0 million of our Class A common stock under our repurchase program. On April 26, 2018, our board of directors authorized us to repurchase up to an additional $300 million of our Class A common stock under our previously announced stock repurchase program. Including the additional $300 million , we are authorized to repurchase up to a remaining $370.0 million of our Class A common stock under the existing stock repurchase program. As of March 31, 2018 , we had repurchased and retired 2,077,105 shares of our Class A common stock, under the existing stock repurchase program, for a total purchase price of $130.0 million .

Revenue Revenue

Revenue Revenue	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue We adopted the new revenue recognition accounting standard ASC 606 effective January 1, 2018 on a modified retrospective basis and applied the new standard only to contracts that were not completed contracts prior to January 1, 2018. See Note 2 for a description of our ASC 606 revenue recognition accounting policy. Financial results for reporting periods during 2018 are presented in compliance with the new revenue recognition standard. Historical financial results for reporting periods prior to 2018 have not been retroactively restated and are presented in conformity with amounts previously disclosed under ASC 605. This note includes additional information regarding the impacts from the adoption of the new revenue recognition standard on our financial results for the three months ended March 31, 2018 . This includes the presentation of financial results during 2018 under ASC 605 for comparison to the prior year. Our revenue recognition accounting policy for ASC 605 is included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017, which was filed with the SEC on February 26, 2018. There were no changes to our ASC 605 policy during the first quarter of 2018. Condensed Consolidated Balance Sheets (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated balance sheets as of March 31, 2018 : March 31, 2018 December 31, 2017 As Reported (ASC 606) Impacts from Adoption Without Adoption (ASC 605) As Reported (ASC 605) (in thousands) Assets Current assets Cash and cash equivalents $ 623,994 $ — $ 623,994 $ 627,878 Short-term investments 241,652 — 241,652 226,787 Accounts receivable, net 132,611 — 132,611 203,366 Prepaid expenses and other current assets 98,461 (68,249 ) 30,212 30,514 Income taxes receivable 883 — 883 673 Total current assets 1,097,601 (68,249 ) 1,029,352 1,089,218 Long-term investments 157,497 — 157,497 148,364 Property and equipment, net 101,121 — 101,121 106,753 Goodwill 35,083 — 35,083 35,083 Deferred income taxes 4,215 1,589 5,804 5,287 Other long-term assets 35,139 (21,264 ) 13,875 14,090 Total assets $ 1,430,656 $ (87,924 ) $ 1,342,732 $ 1,398,795 Liabilities and stockholders' equity Current liabilities Accounts payable $ 2,817 $ — $ 2,817 $ 4,448 Accrued compensation and employee-related benefits 81,268 — 81,268 96,390 Other accrued liabilities 41,935 — 41,935 37,722 Income taxes payable 4,467 1,826 6,293 4,743 Deferred revenue 314,698 104,407 419,105 419,426 Total current liabilities 445,185 106,233 551,418 562,729 Deferred revenue 21,687 5,521 27,208 28,058 Other long-term liabilities 53,911 (746 ) 53,165 54,385 Total liabilities 520,783 111,008 631,791 645,172 Stockholders' equity Common stock 8 — 8 8 Additional paid-in capital 1,205,459 — 1,205,459 1,168,563 Accumulated other comprehensive loss (10,571 ) (1,972 ) (12,543 ) (11,991 ) Accumulated deficit (285,023 ) (196,960 ) (481,983 ) (402,957 ) Total stockholders' equity 909,873 (198,932 ) 710,941 753,623 Total liabilities and stockholders' equity $ 1,430,656 $ (87,924 ) $ 1,342,732 $ 1,398,795 Condensed Consolidated Statements of Operations (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of operations for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Revenues License $ 108,793 $ (3,127 ) $ 105,666 $ 97,244 Maintenance and services 137,414 (19,036 ) 118,378 102,662 Total revenues 246,207 (22,163 ) 224,044 199,906 Cost of revenues License 3,954 (52 ) 3,902 3,267 Maintenance and services 28,471 61 28,532 23,388 Total cost of revenues 32,425 9 32,434 26,655 Gross profit 213,782 (22,172 ) 191,610 173,251 Operating expenses Sales and marketing 138,406 4,607 143,013 118,018 Research and development 93,505 — 93,505 84,302 General and administrative 32,250 — 32,250 24,445 Total operating expenses 264,161 4,607 268,768 226,765 Operating loss (50,379 ) (26,779 ) (77,158 ) (53,514 ) Other income, net 1,462 (38 ) 1,424 1,225 Loss before income tax expense (benefit) (48,917 ) (26,817 ) (75,734 ) (52,289 ) Income tax expense (benefit) (2,445 ) 5,737 3,292 2,358 Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of comprehensive loss for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Other comprehensive income (loss), net of tax: Foreign currency translation 586 (289 ) 297 (824 ) Net unrealized loss on available-for-sale securities (849 ) — (849 ) — Comprehensive loss $ (46,735 ) $ (32,843 ) $ (79,578 ) $ (55,471 ) Condensed Consolidated Statements of Cash Flows (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of cash flows for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Operating activities Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Adjustments to reconcile net loss to net cash provided by operating activities Depreciation and amortization expense 9,647 — 9,647 13,435 Amortization of premiums on investments, net 118 — 118 — Stock-based compensation expense 55,763 — 55,763 49,195 Deferred income taxes (4,226 ) 3,869 (357 ) 128 Changes in operating assets and liabilities Accounts receivable, net 73,012 — 73,012 76,878 Prepaid expenses and other assets (22,891 ) 23,230 339 11,270 Income taxes receivable (194 ) — (194 ) 6 Deferred revenue (7,507 ) 3,521 (3,986 ) 4,008 Accounts payable and accrued liabilities (4,279 ) — (4,279 ) (16,620 ) Income taxes payable (356 ) 1,825 1,469 842 Net cash provided by operating activities 52,615 (109 ) 52,506 84,495 Investing activities Purchases of property and equipment (5,251 ) — (5,251 ) (23,238 ) Purchases of investments (102,450 ) — (102,450 ) — Maturities of investments 77,385 — 77,385 — Sales of investments 99 — 99 — Net cash used in investing activities (30,217 ) — (30,217 ) (23,238 ) Financing activities Proceeds from issuance of common stock 2,492 — 2,492 4,309 Repurchases of common stock (30,007 ) — (30,007 ) (20,008 ) Net cash used in financing activities (27,515 ) — (27,515 ) (15,699 ) Effect of exchange rate changes on cash and cash equivalents 1,233 109 1,342 374 Net increase (decrease) in cash and cash equivalents (3,884 ) — (3,884 ) 45,932 Cash and cash equivalents Beginning of period 627,878 — 627,878 908,717 End of period $ 623,994 $ — $ 623,994 $ 954,649 Disclosures Related to our Contracts with Customers 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 A summary of the activity impacting our contract assets during the three months ended March 31, 2018 is presented below: Contract Assets (in thousands) Balances at December 31, 2017 $ — Adoption of ASC 606 40,854 Contract assets transferred to receivables (1,315 ) Additions to contract assets 21,127 Balances at March 31, 2018 $ 60,666 As of March 31, 2018 , our contract assets are expected to be transferred to receivables within the next 12 months and therefore are included in other current assets. There were no impairments of contract assets during the three months ended March 31, 2018 . A summary of the activity impacting our deferred revenue balances during the three months ended March 31, 2018 is presented below: Deferred Revenue (in thousands) Balances at December 31, 2017 $ 447,484 Adoption of ASC 606 (105,933 ) Deferred revenue recognized (120,820 ) Additional amounts deferred 115,654 Balances at March 31, 2018 $ 336,385 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 four years. A summary of the activity impacting our deferred contract costs during the three months ended March 31, 2018 is presented below: Deferred Contract Costs (in thousands) Balances at December 31, 2017 $ — Adoption of ASC 606 25,489 Additional contract costs deferred 6,736 Amortization of deferred contract costs (2,048 ) Balances at March 31, 2018 $ 30,177 As of March 31, 2018 , $8.9 million of our deferred contract costs are expected to be amortized within the next 12 months and therefore are included in other current assets. The remaining amount of our deferred contract costs are included in other long-term assets. There were no impairments of assets related to deferred contract costs during the three months ended March 31, 2018 . There were no assets recognized related to the costs to fulfill contracts during the three months ended March 31, 2018 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. These amounts include additional performance obligations that are not yet recorded in the consolidated balance sheets. As of March 31, 2018 , amounts allocated to these additional contractual obligations are $114.5 million , of which we expect to recognize $93.1 million as revenue over the next 24 months with the remaining amount thereafter.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-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, restricted stock units ("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 three months ended March 31, 2018 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, 2017 3,017,113 $ 10.13 Options exercised (216,308 ) 11.52 Balances at March 31, 2018 2,800,805 $ 10.03 4.09 $ 198,276 Vested and expected to vest at March 31, 2018 2,800,805 $ 10.03 4.09 $ 198,276 Exercisable at March 31, 2018 2,753,930 $ 9.26 4.01 $ 197,059 The intrinsic value is the difference between the current fair value of the stock and the exercise price of the stock option. A summary of the RSU activity during the three months ended March 31, 2018 follows: Number of Shares Underlying Outstanding RSUs Weighted-Average Grant-Date Fair Value per RSU Non-Vested outstanding at December 31, 2017 7,178,015 $ 62.79 RSUs granted 2,376,440 83.32 RSUs vested (1,222,641 ) 65.24 RSUs forfeited (238,327 ) 63.38 Non-Vested outstanding at March 31, 2018 8,093,487 $ 68.43 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. For awards subject to technology milestones, we recognize compensation cost over the estimated requisite service period if we believe it is probable that the associated technology milestone will be met. If our assessment of the probability of the technology milestone being met changes, we recognize the impact of the change in estimate in the period of the change. Stock-based compensation expense is amortized using the straight-line method over the requisite service period. We account for forfeitures as they occur. As of March 31, 2018 , total unrecognized compensation expense related to stock options and non-vested RSUs was $519.1 million , which is expected to be recognized over a weighted average period of 2.9 years . The summary of shares available for issuance of equity-based awards (including stock options, RSUs and shares issuable under our 2013 ESPP) during the three months ended March 31, 2018 follows: Shares Available for Grant 2013 Plan 2013 ESPP Balances at December 31, 2017 7,207,291 3,666,392 Authorized 4,023,117 804,623 Granted (2,376,440 ) — Forfeited 238,327 — Balances at March 31, 2018 9,092,295 4,471,015

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
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. The impact of adjustments to our effective tax rate for discrete items and non-deductible expenses is greater in periods close to break-even. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment. 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 an income tax benefit of $2.4 million under ASC 606 for the three months ended March 31, 2018 compared to an income tax expense of $2.4 million for three months ended March 31, 2017 . Our effective tax rate was 5.0% and (4.5)% for the three months ended March 31, 2018 and 2017 , respectively. The difference in the effective tax rates between the three month periods is primarily attributable to additional income as a result of our adoption of ASC 606 combined with a year to date tax benefit in foreign jurisdictions, which was increased by the recognition of excess tax benefits of stock-based compensation during the period. We recognized an income tax expense of $3.3 million under ASC 605 for the three months ended March 31, 2018 compared to an income tax expense of $2.4 million for the three months ended March 31, 2017 . Our effective tax rate was (4.3)% and (4.5)% for the three months ended March 31, 2018 and 2017 , respectively. The difference in the effective tax rates between the three month periods was related to an increase in taxes in foreign jurisdictions, offset by an income tax benefit from the recognition of excess tax benefits of stock-based compensation during the three months ended March 31, 2018 . The difference in effective tax rates between ASC 606 and ASC 605 is primarily attributable to the differences in the amount of revenue recognized under ASC 606 as compared to ASC 605. As a result of adopting ASC 606 in the first quarter of 2018, we recognized an immaterial amount of net deferred tax liabilities, which reduced our opening adjustment to stockholders' equity. During the first quarter of 2018, we also adopted ASU 2016-16 and recognized a U.S. deferred tax asset, which was fully offset by a corresponding increase to the valuation allowance on our U.S. federal and state deferred income tax assets. 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 March 31, 2018 , we maintain a full valuation allowance on our U.S. federal and state deferred tax assets. On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the "Act") was signed with an effective date of January 1, 2018. The Act, which significantly revised U.S. tax law, included many important changes. On the same day, Staff Accounting Bulletin No. 118 ("SAB 118") was issued to assist in addressing uncertainty in applying GAAP to the accounting and reporting of tax reform changes related to the Act. We considered these changes, including all available guidance, in determining our income tax provision for the period ending December 31, 2017. As of March 31, 2018, we have not yet completed our analysis of historical foreign earnings as well as potential correlative adjustments. As we complete the analysis, any subsequent adjustment to these amounts may be recorded to current income tax expense in that period. We expect to complete our analysis within the measurement period in accordance with SAB 118. No adjustments to the provisional amount have been made. On July 27, 2015, the U.S. Tax Court issued an opinion related to litigation in Altera Corp v. Commissioner . This litigation relates to the treatment of stock-based compensation expense in an intercompany cost sharing arrangement with one of Altera's foreign subsidiaries. In its opinion, the U.S. Tax Court invalidated the portion of the Treasury regulations requiring the inclusion of stock-based compensation expense in such intercompany cost-sharing arrangements. On February 19, 2016, the IRS appealed the U.S. Tax Court's decision. As the final resolution of this litigation remains uncertain, we have not recorded potentially favorable benefits related to the current or prior periods. We will continue to monitor developments related to this case and the potential impact of those developments on our current and future financial statements.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Lease Commitments and Expected Sublease Receipts As of March 31, 2018 , our principal obligations consisted of obligations outstanding under non-cancellable operating leases that expire at various dates through 2029. The following table represents our non-cancellable minimum lease payments, net of future expected sublease payments to be received under non-cancellable subleases, remaining as of March 31, 2018 (in thousands): Period Ending Operating Lease Commitments Expected Sublease Receipts Net Remainder of 2018 $ 33,177 $ (6,793 ) $ 26,384 2019 41,480 (10,606 ) 30,874 2020 43,138 (7,113 ) 36,025 2021 43,603 (1,180 ) 42,423 2022 43,216 (597 ) 42,619 Thereafter 176,759 (121 ) 176,638 Total $ 381,373 $ (26,410 ) $ 354,963 Contractual Commitments Our 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 in our contractual commitments compared to those discussed in Note 10 in our Annual Report on Form 10-K for the year ended December 31, 2017 . Legal Proceedings We are subject to certain routine legal proceedings, as well as demands and claims that arise in the normal course of our business. We make a provision for a liability relating to legal matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed and adjusted to reflect the impacts of negotiations, estimated settlements, legal rulings, advice of legal counsel and other information and events pertaining to a particular matter. We are not aware of any pending legal proceedings that we believe, individually or in the aggregate, would be expected to have a material adverse effect on our business, operating results, or financial condition. We may, in the future, be party to litigation arising in the ordinary course of business, including claims that we allegedly infringe upon third party intellectual property rights. Such claims, even if not meritorious, could result in the expenditure of significant financial and management resources.

Segments and Information about

Segments and Information about Revenues by Geographic Region	3 Months Ended
	Mar. 31, 2018
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 March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (dollars in thousands) United States and Canada $ 167,799 $ (13,356 ) $ 154,443 $ 141,496 International 78,408 (8,807 ) 69,601 58,410 Total revenues $ 246,207 $ (22,163 ) $ 224,044 $ 199,906 For the three months ended March 31, 2018 and 2017 , no individual country other than the United States represented 10% or more of our total revenues. Revenues from Canada represented less than 5% of our total revenues.

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2018
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 months ended March 31, 2018 and 2017 and includes additional information regarding the impacts from the adoption of the new revenue recognition standard for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands, except per share amounts) Net loss per share - basic and diluted Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Weighted average shares outstanding used to compute basic and diluted net loss per share 81,039 81,039 77,416 Net loss per share - basic and diluted $ (0.57 ) $ (0.98 ) $ (0.71 ) The following shares 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 March 31, 2018 2017 (in thousands) Shares subject to outstanding common stock awards 11,193 12,658

Summary of Significant Accoun19

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Revenue Recognition	Revenue Recognition - ASC 606 We generate revenues primarily in the form of software license fees and related maintenance and services fees. Software license revenues include fees from the sales of perpetual, term and subscription licenses. Maintenance and services revenues primarily consist of fees for maintenance services (including support and unspecified upgrades and enhancements when and if they are available), training and professional services. We recognize revenues related to our contracts with customers based on the following criteria: • the contract contains reasonable evidence of approval and both parties' commitment to perform their respective obligations; • the contract includes identifiable rights to goods and services to be transferred and payment terms related to the transfer of those goods and services; • the contract has commercial substance; and • collection of substantially all of the consideration we are entitled to under the contract is probable. We identify performance obligations in our contracts with customers, which may include software licenses and/or related maintenance and services. We determine the transaction price based on the amount we expect to be entitled to in exchange for transferring the promised goods or services to the customer. We allocate the transaction price in the contract to each distinct performance obligation in an amount that depicts the relative amount of consideration we expect to receive in exchange for satisfying each performance obligation. Revenue is recognized when performance obligations are satisfied. Our contract payment terms are typically net 30 days . We assess collectability based on a number of factors including collection history and creditworthiness of the customer, and we may mitigate exposures to credit risk by requiring payments in advance. If we determine that collectability related to a contract is not probable, we may not record revenue until collectability becomes probable at a later date. Our revenues are recorded based on the transaction price excluding amounts collected on behalf of third parties such as sales taxes, which are collected on behalf of and remitted to governmental authorities. Nature of Products and Services Our on-premises software licenses are sold both perpetually and through term-based license agreements. These licensing arrangements provide customers with the same product functionality and differ mainly in the duration over which the customer benefits from the software. We deliver our software licenses electronically. Electronic delivery occurs when we provide the customer with access to the software and license key via a secure portal. Revenue from on-premises software licenses is generally recognized upfront at the point in time when the software is made available to the customer. When purchasing an on-premises software license, a customer typically bundles with a maintenance services agreement and may also purchase training and/or professional services. Maintenance services agreements consist of fees for providing software updates on a when and if available basis and for providing technical support for software products for a specified term. We believe that our when and if available software updates and technical support each have the same pattern of transfer to the customer and are substantially the same. Therefore, we consider these to be a single distinct performance obligation. Revenues allocated to maintenance services are recognized ratably as the services are provided. Revenues related to training services are billed on a fixed fee basis and are recognized as the services are delivered. Payments received in advance of services performed are deferred and recognized when the related services are performed. Revenues related to professional services are billed on a time and materials basis and are recognized as the services are performed. We also provide cloud-based subscriptions, which allow customers to access our software during a contractual period without taking possession of the software. We recognize revenue related to these cloud-based subscriptions ratably over the life of the subscription agreement beginning when the customer first has access to the software. Revenues from our cloud-based subscriptions are included in license revenues. Judgments and Estimates Our contracts with customers often include promises to transfer multiple products and services. Determining whether products and services are considered distinct performance obligations that should be accounted for separately from one another sometimes requires judgment. Judgment is required to determine standalone selling prices (“SSP”) for each distinct performance obligation. We typically have more than one SSP for each of our products and services based on customer stratification, which is based on the size of the customer, their geographic region and market segment. We use other comparable software license sales to determine SSPs for perpetual software licenses. For our cloud-based subscriptions and for maintenance services, training and professional services, SSPs are generally observable using standalone sales and/or renewals. Our on-premises term-based software licenses generally do not have directly observable inputs for determining SSP. Therefore, we determine SSP using other observable inputs including customer buying patterns, renewal rates, cumulative spend comparisons and other industry data. We evaluate contracts that include options to purchase additional goods or services to determine whether or not the options give rise to a separate performance obligation that is material. If we determine the options are material, the revenue allocated to such options is not recognized until the option is exercised or the option expires. Our revenue recognition accounting policy for ASC 605 is included in our Annual Report on Form 10-K for the year ended December 31, 2017, which was filed with the SEC on February 26, 2018. We applied the revenue recognition accounting policy for ASC 605 to our disclosures in Note 6, which include amounts presented for 2018. There were no changes to the ASC 605 policy during the first quarter of 2018.
Deferred Commissions	Assets Recognized from the Costs to Obtain a Contract with a Customer 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 have determined that certain costs related to our sales incentive programs meet the requirements to be capitalized and deferred. Assets recorded are included in other current assets and other long-term assets. We amortize these deferred costs proportionate with related revenues over four years, which is generally longer than the term of the initial contract because of anticipated renewals as sales commissions for renewals are not commensurate with sales commissions related to our initial contracts.
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 Securities and Exchange Commission ("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, 2017 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, 2017 filed with the SEC on February 26, 2018 . In the opinion of management, the accompanying unaudited condensed consolidated financial information includes all normal recurring adjustments necessary for a fair statement of the Company's financial position, results of operations, comprehensive loss and cash flows for the interim periods, but is not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . 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 useful lives of our property and equipment and other lease-related assets, liabilities and costs; the benefit period for deferred commissions; the valuation of investments and the determination of other-than-temporary impairments; 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 and our ability to attract new customers and expand sales to existing customers, 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 established annual and interim reporting standards for an enterprise's operating segments and related disclosures about its 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 Interim 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 and accounts receivable. Our investment portfolio consists of investment-grade securities diversified among security types, industries and issuers. Our cash and cash equivalents and investments are held and managed by recognized financial institutions that follow our investment policy. 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 March 31, 2018 and December 31, 2017 , no individual customer accounted for 10% or more of total accounts receivable. For the three months ended March 31, 2018 and 2017 , no individual customer represented 10% or more of our total revenues.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09 related to revenue recognition and later issued additional ASUs including ASU 2016-08, ASU 2016-10, ASU 2016-12, ASU 2016-20 and ASU 2017-14, all of which clarified certain aspects of ASU 2014-09, and together with ASU 2014-09, which we refer to collectively as the new revenue recognition standard. The new revenue recognition standard changed the way we recognize revenue, including the identification of contractual performance obligations and the allocation of transaction price, to depict the transfer of promised goods or services to customers at the amount that reflects the consideration to which we expect to be entitled in exchange for those goods or services. We adopted the new revenue recognition standard in the first quarter of 2018 on a modified retrospective basis and applied the new revenue recognition standard only to contracts that were not completed contracts prior to January 1, 2018. Upon adoption, we recorded an adjustment of $146.8 million to our accumulated deficit. The adjustment was offset by a $105.9 million reduction to deferred revenue, which was primarily related to on-premises term licenses, and the addition of a $40.9 million contract asset. The new revenue recognition standard materially impacts the timing of revenue recognition related to our on-premises term license agreements. Prior to our adoption of the new revenue recognition standard, we historically recognized revenue related to on-premises term license agreements ratably over the term of the licensing agreement. Under the new revenue recognition standard, revenue allocable to the license portion of the arrangement is recognized upon delivery of the license. Maintenance revenue related to on-premises term license agreements continue to be recognized ratably over the term of the licensing agreement. Under the new revenue recognition standard, we allocate total transaction price to performance obligations based on estimated standalone selling prices, which impacts the timing of revenue recognition depending on when each performance obligation is recognized. These impacts to the timing of revenue recognition also affect our deferred revenue balances. The new revenue recognition standard requires the capitalization of certain incremental costs of obtaining a contract, which impacts the period in which we record our sales commissions expense. Prior to our adoption of the new revenue recognition standard, we recognized sales commissions expense as incurred. Under the new revenue recognition standard, we are required to recognize these expenses over the period of benefit associated with these costs. This results in a deferral of sales commissions expense each period. Upon adoption, we reduced our accumulated deficit by $25.5 million and recognized an offsetting asset for deferred sales commissions related to contracts that were not completed contracts prior to January 1, 2018. For further discussion regarding the impacts of adopting the new revenue recognition standard, see Note 6. In October 2016, the FASB issued ASU 2016-16 related to the accounting for income tax effects on intra-entity asset transfers of assets other than inventory. The new guidance requires reporting entities to recognize tax expense from the sale of assets when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in consolidation. We adopted the new standard in the first quarter of 2018 on a modified retrospective basis. The adoption resulted in the recognition of a U.S. deferred tax asset, which was fully offset by a corresponding increase to the valuation allowance on our U.S. federal and state deferred income tax assets, and therefore did not have a material impact on our consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU 2016-02 related to lease accounting. The new guidance will require lessees to recognize right-of-use assets and lease liabilities on the balance sheet for operating leases that do not meet the definition of a short-term lease. ASU 2016-02 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2018 and requires modified retrospective transition. Under the new standard we anticipate that our current real estate leases will continue to be classified as operating leases and a significant amount of our currently outstanding operating lease commitments will be recorded to the balance sheet as right-of-use assets with corresponding lease liabilities. Our evaluation of the new standard will extend into future periods and we will update our disclosures, including the expected impacts of the new standard, as we progress towards the required adoption date. In June 2016, the FASB issued 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. Early adoption is permitted. We are currently evaluating the impact that this standard will have on our consolidated financial statements.

Short-Term and Long-Term Inve20

Short-Term and Long-Term Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Short-term and Long-term Investments	The following tables represent our short-term and long-term investments in available-for-sale securities as of March 31, 2018 and December 31, 2017 , based on contractual years to maturity: March 31, 2018 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments U.S. treasury securities $ 158,727 $ — $ (255 ) $ 158,472 U.S. agency securities 21,407 — (94 ) 21,313 Corporate bonds 62,058 — (191 ) 61,867 Total short-term investments 242,192 — (540 ) 241,652 Long-term investments U.S. treasury securities 99,562 — (502 ) 99,060 U.S. agency securities 8,576 — (71 ) 8,505 Corporate bonds 50,332 — (400 ) 49,932 Total long-term investments 158,470 — (973 ) 157,497 Total short-term and long-term investments $ 400,662 $ — $ (1,513 ) $ 399,149 December 31, 2017 Amortized Cost Unrealized Gains Unrealized Losses Fair Value (in thousands) Short-term investments Commercial paper $ 9,970 $ — $ — $ 9,970 U.S. treasury securities 160,206 — (121 ) 160,085 U.S. agency securities 9,917 — (24 ) 9,893 Corporate bonds 46,901 3 (65 ) 46,839 Total short-term investments 226,994 3 (210 ) 226,787 Long-term investments U.S. treasury securities 79,371 — (202 ) 79,169 U.S. agency securities 18,570 — (102 ) 18,468 Corporate bonds 50,880 — (153 ) 50,727 Total long-term investments 148,821 — (457 ) 148,364 Total short-term and long-term investments $ 375,815 $ 3 $ (667 ) $ 375,151

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets	The following tables present the fair value of our financial assets using the fair value hierarchy as of March 31, 2018 and December 31, 2017 : March 31, 2018 Level 1 Level 2 Level 3 Total (in thousands) Cash and cash equivalents Money market funds $ 553,667 $ — $ — $ 553,667 Short-term investments U.S. treasury securities — 158,472 — 158,472 U.S. agency securities — 21,313 — 21,313 Corporate bonds — 61,867 — 61,867 Long-term investments U.S. treasury securities — 99,060 — 99,060 U.S. agency securities — 8,505 — 8,505 Corporate bonds — 49,932 — 49,932 Total $ 553,667 $ 399,149 $ — $ 952,816 December 31, 2017 Level 1 Level 2 Level 3 Total (in thousands) Cash and cash equivalents Money market funds $ 582,835 $ — $ — $ 582,835 Commercial paper — 8,984 — 8,984 Short-term investments Commercial paper — 9,970 — 9,970 U.S. treasury securities — 160,085 — 160,085 U.S. agency securities — 9,893 — 9,893 Corporate bonds — 46,839 — 46,839 Long-term investments U.S. treasury securities — 79,169 — 79,169 U.S. agency securities — 18,468 — 18,468 Corporate bonds — 50,727 — 50,727 Total $ 582,835 $ 384,135 $ — $ 966,970

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated balance sheets as of March 31, 2018 : March 31, 2018 December 31, 2017 As Reported (ASC 606) Impacts from Adoption Without Adoption (ASC 605) As Reported (ASC 605) (in thousands) Assets Current assets Cash and cash equivalents $ 623,994 $ — $ 623,994 $ 627,878 Short-term investments 241,652 — 241,652 226,787 Accounts receivable, net 132,611 — 132,611 203,366 Prepaid expenses and other current assets 98,461 (68,249 ) 30,212 30,514 Income taxes receivable 883 — 883 673 Total current assets 1,097,601 (68,249 ) 1,029,352 1,089,218 Long-term investments 157,497 — 157,497 148,364 Property and equipment, net 101,121 — 101,121 106,753 Goodwill 35,083 — 35,083 35,083 Deferred income taxes 4,215 1,589 5,804 5,287 Other long-term assets 35,139 (21,264 ) 13,875 14,090 Total assets $ 1,430,656 $ (87,924 ) $ 1,342,732 $ 1,398,795 Liabilities and stockholders' equity Current liabilities Accounts payable $ 2,817 $ — $ 2,817 $ 4,448 Accrued compensation and employee-related benefits 81,268 — 81,268 96,390 Other accrued liabilities 41,935 — 41,935 37,722 Income taxes payable 4,467 1,826 6,293 4,743 Deferred revenue 314,698 104,407 419,105 419,426 Total current liabilities 445,185 106,233 551,418 562,729 Deferred revenue 21,687 5,521 27,208 28,058 Other long-term liabilities 53,911 (746 ) 53,165 54,385 Total liabilities 520,783 111,008 631,791 645,172 Stockholders' equity Common stock 8 — 8 8 Additional paid-in capital 1,205,459 — 1,205,459 1,168,563 Accumulated other comprehensive loss (10,571 ) (1,972 ) (12,543 ) (11,991 ) Accumulated deficit (285,023 ) (196,960 ) (481,983 ) (402,957 ) Total stockholders' equity 909,873 (198,932 ) 710,941 753,623 Total liabilities and stockholders' equity $ 1,430,656 $ (87,924 ) $ 1,342,732 $ 1,398,795 Condensed Consolidated Statements of Operations (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of operations for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Revenues License $ 108,793 $ (3,127 ) $ 105,666 $ 97,244 Maintenance and services 137,414 (19,036 ) 118,378 102,662 Total revenues 246,207 (22,163 ) 224,044 199,906 Cost of revenues License 3,954 (52 ) 3,902 3,267 Maintenance and services 28,471 61 28,532 23,388 Total cost of revenues 32,425 9 32,434 26,655 Gross profit 213,782 (22,172 ) 191,610 173,251 Operating expenses Sales and marketing 138,406 4,607 143,013 118,018 Research and development 93,505 — 93,505 84,302 General and administrative 32,250 — 32,250 24,445 Total operating expenses 264,161 4,607 268,768 226,765 Operating loss (50,379 ) (26,779 ) (77,158 ) (53,514 ) Other income, net 1,462 (38 ) 1,424 1,225 Loss before income tax expense (benefit) (48,917 ) (26,817 ) (75,734 ) (52,289 ) Income tax expense (benefit) (2,445 ) 5,737 3,292 2,358 Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of comprehensive loss for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Other comprehensive income (loss), net of tax: Foreign currency translation 586 (289 ) 297 (824 ) Net unrealized loss on available-for-sale securities (849 ) — (849 ) — Comprehensive loss $ (46,735 ) $ (32,843 ) $ (79,578 ) $ (55,471 ) Condensed Consolidated Statements of Cash Flows (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of cash flows for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Operating activities Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Adjustments to reconcile net loss to net cash provided by operating activities Depreciation and amortization expense 9,647 — 9,647 13,435 Amortization of premiums on investments, net 118 — 118 — Stock-based compensation expense 55,763 — 55,763 49,195 Deferred income taxes (4,226 ) 3,869 (357 ) 128 Changes in operating assets and liabilities Accounts receivable, net 73,012 — 73,012 76,878 Prepaid expenses and other assets (22,891 ) 23,230 339 11,270 Income taxes receivable (194 ) — (194 ) 6 Deferred revenue (7,507 ) 3,521 (3,986 ) 4,008 Accounts payable and accrued liabilities (4,279 ) — (4,279 ) (16,620 ) Income taxes payable (356 ) 1,825 1,469 842 Net cash provided by operating activities 52,615 (109 ) 52,506 84,495 Investing activities Purchases of property and equipment (5,251 ) — (5,251 ) (23,238 ) Purchases of investments (102,450 ) — (102,450 ) — Maturities of investments 77,385 — 77,385 — Sales of investments 99 — 99 — Net cash used in investing activities (30,217 ) — (30,217 ) (23,238 ) Financing activities Proceeds from issuance of common stock 2,492 — 2,492 4,309 Repurchases of common stock (30,007 ) — (30,007 ) (20,008 ) Net cash used in financing activities (27,515 ) — (27,515 ) (15,699 ) Effect of exchange rate changes on cash and cash equivalents 1,233 109 1,342 374 Net increase (decrease) in cash and cash equivalents (3,884 ) — (3,884 ) 45,932 Cash and cash equivalents Beginning of period 627,878 — 627,878 908,717 End of period $ 623,994 $ — $ 623,994 $ 954,649 The following table presents the computation of basic and diluted net loss per share for the three months ended March 31, 2018 and 2017 and includes additional information regarding the impacts from the adoption of the new revenue recognition standard for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands, except per share amounts) Net loss per share - basic and diluted Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Weighted average shares outstanding used to compute basic and diluted net loss per share 81,039 81,039 77,416 Net loss per share - basic and diluted $ (0.57 ) $ (0.98 ) $ (0.71 )
Contract with Customer, Asset and Liability	A summary of the activity impacting our contract assets during the three months ended March 31, 2018 is presented below: Contract Assets (in thousands) Balances at December 31, 2017 $ — Adoption of ASC 606 40,854 Contract assets transferred to receivables (1,315 ) Additions to contract assets 21,127 Balances at March 31, 2018 $ 60,666 As of March 31, 2018 , our contract assets are expected to be transferred to receivables within the next 12 months and therefore are included in other current assets. There were no impairments of contract assets during the three months ended March 31, 2018 . A summary of the activity impacting our deferred revenue balances during the three months ended March 31, 2018 is presented below: Deferred Revenue (in thousands) Balances at December 31, 2017 $ 447,484 Adoption of ASC 606 (105,933 ) Deferred revenue recognized (120,820 ) Additional amounts deferred 115,654 Balances at March 31, 2018 $ 336,385 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 four years. A summary of the activity impacting our deferred contract costs during the three months ended March 31, 2018 is presented below: Deferred Contract Costs (in thousands) Balances at December 31, 2017 $ — Adoption of ASC 606 25,489 Additional contract costs deferred 6,736 Amortization of deferred contract costs (2,048 ) Balances at March 31, 2018 $ 30,177

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity	A summary of the option activity during the three months ended March 31, 2018 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, 2017 3,017,113 $ 10.13 Options exercised (216,308 ) 11.52 Balances at March 31, 2018 2,800,805 $ 10.03 4.09 $ 198,276 Vested and expected to vest at March 31, 2018 2,800,805 $ 10.03 4.09 $ 198,276 Exercisable at March 31, 2018 2,753,930 $ 9.26 4.01 $ 197,059
Summary of RSU Activity	A summary of the RSU activity during the three months ended March 31, 2018 follows: Number of Shares Underlying Outstanding RSUs Weighted-Average Grant-Date Fair Value per RSU Non-Vested outstanding at December 31, 2017 7,178,015 $ 62.79 RSUs granted 2,376,440 83.32 RSUs vested (1,222,641 ) 65.24 RSUs forfeited (238,327 ) 63.38 Non-Vested outstanding at March 31, 2018 8,093,487 $ 68.43
Summary of Shares Available for Grant	The summary of shares available for issuance of equity-based awards (including stock options, RSUs and shares issuable under our 2013 ESPP) during the three months ended March 31, 2018 follows: Shares Available for Grant 2013 Plan 2013 ESPP Balances at December 31, 2017 7,207,291 3,666,392 Authorized 4,023,117 804,623 Granted (2,376,440 ) — Forfeited 238,327 — Balances at March 31, 2018 9,092,295 4,471,015

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Rental Payments for Operating Leases, Net of Expected Sublease Receipts	The following table represents our non-cancellable minimum lease payments, net of future expected sublease payments to be received under non-cancellable subleases, remaining as of March 31, 2018 (in thousands): Period Ending Operating Lease Commitments Expected Sublease Receipts Net Remainder of 2018 $ 33,177 $ (6,793 ) $ 26,384 2019 41,480 (10,606 ) 30,874 2020 43,138 (7,113 ) 36,025 2021 43,603 (1,180 ) 42,423 2022 43,216 (597 ) 42,619 Thereafter 176,759 (121 ) 176,638 Total $ 381,373 $ (26,410 ) $ 354,963

Segments and Information abou25

Segments and Information about Revenues by Geographic Region (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	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 March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (dollars in thousands) United States and Canada $ 167,799 $ (13,356 ) $ 154,443 $ 141,496 International 78,408 (8,807 ) 69,601 58,410 Total revenues $ 246,207 $ (22,163 ) $ 224,044 $ 199,906

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated balance sheets as of March 31, 2018 : March 31, 2018 December 31, 2017 As Reported (ASC 606) Impacts from Adoption Without Adoption (ASC 605) As Reported (ASC 605) (in thousands) Assets Current assets Cash and cash equivalents $ 623,994 $ — $ 623,994 $ 627,878 Short-term investments 241,652 — 241,652 226,787 Accounts receivable, net 132,611 — 132,611 203,366 Prepaid expenses and other current assets 98,461 (68,249 ) 30,212 30,514 Income taxes receivable 883 — 883 673 Total current assets 1,097,601 (68,249 ) 1,029,352 1,089,218 Long-term investments 157,497 — 157,497 148,364 Property and equipment, net 101,121 — 101,121 106,753 Goodwill 35,083 — 35,083 35,083 Deferred income taxes 4,215 1,589 5,804 5,287 Other long-term assets 35,139 (21,264 ) 13,875 14,090 Total assets $ 1,430,656 $ (87,924 ) $ 1,342,732 $ 1,398,795 Liabilities and stockholders' equity Current liabilities Accounts payable $ 2,817 $ — $ 2,817 $ 4,448 Accrued compensation and employee-related benefits 81,268 — 81,268 96,390 Other accrued liabilities 41,935 — 41,935 37,722 Income taxes payable 4,467 1,826 6,293 4,743 Deferred revenue 314,698 104,407 419,105 419,426 Total current liabilities 445,185 106,233 551,418 562,729 Deferred revenue 21,687 5,521 27,208 28,058 Other long-term liabilities 53,911 (746 ) 53,165 54,385 Total liabilities 520,783 111,008 631,791 645,172 Stockholders' equity Common stock 8 — 8 8 Additional paid-in capital 1,205,459 — 1,205,459 1,168,563 Accumulated other comprehensive loss (10,571 ) (1,972 ) (12,543 ) (11,991 ) Accumulated deficit (285,023 ) (196,960 ) (481,983 ) (402,957 ) Total stockholders' equity 909,873 (198,932 ) 710,941 753,623 Total liabilities and stockholders' equity $ 1,430,656 $ (87,924 ) $ 1,342,732 $ 1,398,795 Condensed Consolidated Statements of Operations (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of operations for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Revenues License $ 108,793 $ (3,127 ) $ 105,666 $ 97,244 Maintenance and services 137,414 (19,036 ) 118,378 102,662 Total revenues 246,207 (22,163 ) 224,044 199,906 Cost of revenues License 3,954 (52 ) 3,902 3,267 Maintenance and services 28,471 61 28,532 23,388 Total cost of revenues 32,425 9 32,434 26,655 Gross profit 213,782 (22,172 ) 191,610 173,251 Operating expenses Sales and marketing 138,406 4,607 143,013 118,018 Research and development 93,505 — 93,505 84,302 General and administrative 32,250 — 32,250 24,445 Total operating expenses 264,161 4,607 268,768 226,765 Operating loss (50,379 ) (26,779 ) (77,158 ) (53,514 ) Other income, net 1,462 (38 ) 1,424 1,225 Loss before income tax expense (benefit) (48,917 ) (26,817 ) (75,734 ) (52,289 ) Income tax expense (benefit) (2,445 ) 5,737 3,292 2,358 Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of comprehensive loss for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Other comprehensive income (loss), net of tax: Foreign currency translation 586 (289 ) 297 (824 ) Net unrealized loss on available-for-sale securities (849 ) — (849 ) — Comprehensive loss $ (46,735 ) $ (32,843 ) $ (79,578 ) $ (55,471 ) Condensed Consolidated Statements of Cash Flows (Unaudited) - Reconciliation of the Impacts from the Adoption of the New Revenue Recognition Standard The following schedule summarizes the impacts from the adoption of the new revenue recognition standard on our condensed consolidated statement of cash flows for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands) Operating activities Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Adjustments to reconcile net loss to net cash provided by operating activities Depreciation and amortization expense 9,647 — 9,647 13,435 Amortization of premiums on investments, net 118 — 118 — Stock-based compensation expense 55,763 — 55,763 49,195 Deferred income taxes (4,226 ) 3,869 (357 ) 128 Changes in operating assets and liabilities Accounts receivable, net 73,012 — 73,012 76,878 Prepaid expenses and other assets (22,891 ) 23,230 339 11,270 Income taxes receivable (194 ) — (194 ) 6 Deferred revenue (7,507 ) 3,521 (3,986 ) 4,008 Accounts payable and accrued liabilities (4,279 ) — (4,279 ) (16,620 ) Income taxes payable (356 ) 1,825 1,469 842 Net cash provided by operating activities 52,615 (109 ) 52,506 84,495 Investing activities Purchases of property and equipment (5,251 ) — (5,251 ) (23,238 ) Purchases of investments (102,450 ) — (102,450 ) — Maturities of investments 77,385 — 77,385 — Sales of investments 99 — 99 — Net cash used in investing activities (30,217 ) — (30,217 ) (23,238 ) Financing activities Proceeds from issuance of common stock 2,492 — 2,492 4,309 Repurchases of common stock (30,007 ) — (30,007 ) (20,008 ) Net cash used in financing activities (27,515 ) — (27,515 ) (15,699 ) Effect of exchange rate changes on cash and cash equivalents 1,233 109 1,342 374 Net increase (decrease) in cash and cash equivalents (3,884 ) — (3,884 ) 45,932 Cash and cash equivalents Beginning of period 627,878 — 627,878 908,717 End of period $ 623,994 $ — $ 623,994 $ 954,649 The following table presents the computation of basic and diluted net loss per share for the three months ended March 31, 2018 and 2017 and includes additional information regarding the impacts from the adoption of the new revenue recognition standard for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 2017 As Reported Impacts from Adoption Without Adoption As Reported (in thousands, except per share amounts) Net loss per share - basic and diluted Net loss $ (46,472 ) $ (32,554 ) $ (79,026 ) $ (54,647 ) Weighted average shares outstanding used to compute basic and diluted net loss per share 81,039 81,039 77,416 Net loss per share - basic and diluted $ (0.57 ) $ (0.98 ) $ (0.71 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following shares 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 March 31, 2018 2017 (in thousands) Shares subject to outstanding common stock awards 11,193 12,658

Description of Business Narrati

Description of Business Narrative (Details)	Mar. 31, 2018product
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of key products	4

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018segment	Jan. 01, 2018USD ($)
Accounting Policies [Abstract]
Number of Operating Segments | segment	1
Terms of Payment due	30 days
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606		$ 25,500
Deferred Revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606		105,933
Contract Asset [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606		40,854
Stockholders' Equity | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASC 606		$ 146,800

Short-Term and Long-Term Inve29

Short-Term and Long-Term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities
Amortized Cost	$ 400,662	$ 375,815
Unrealized Gains	0	3
Unrealized Losses	(1,513)	(667)
Fair Value	399,149	375,151
Short-term investments
Schedule of Available-for-sale Securities
Amortized Cost	242,192	226,994
Unrealized Gains	0	3
Unrealized Losses	(540)	(210)
Fair Value	241,652	226,787
Short-term investments | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities
Amortized Cost		9,970
Unrealized Gains		0
Unrealized Losses		0
Fair Value		9,970
Short-term investments | U.S. treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	158,727	160,206
Unrealized Gains	0	0
Unrealized Losses	(255)	(121)
Fair Value	158,472	160,085
Short-term investments | U.S. agency securities
Schedule of Available-for-sale Securities
Amortized Cost	21,407	9,917
Unrealized Gains	0	0
Unrealized Losses	(94)	(24)
Fair Value	21,313	9,893
Short-term investments | Corporate bonds
Schedule of Available-for-sale Securities
Amortized Cost	62,058	46,901
Unrealized Gains	0	3
Unrealized Losses	(191)	(65)
Fair Value	61,867	46,839
Long-term investments
Schedule of Available-for-sale Securities
Amortized Cost	158,470	148,821
Unrealized Gains	0	0
Unrealized Losses	(973)	(457)
Fair Value	157,497	148,364
Long-term investments | U.S. treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	99,562	79,371
Unrealized Gains	0	0
Unrealized Losses	(502)	(202)
Fair Value	99,060	79,169
Long-term investments | U.S. agency securities
Schedule of Available-for-sale Securities
Amortized Cost	8,576	18,570
Unrealized Gains	0	0
Unrealized Losses	(71)	(102)
Fair Value	8,505	18,468
Long-term investments | Corporate bonds
Schedule of Available-for-sale Securities
Amortized Cost	50,332	50,880
Unrealized Gains	0	0
Unrealized Losses	(400)	(153)
Fair Value	$ 49,932	$ 50,727

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	$ 952,816	$ 966,970
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	553,667	582,835
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	399,149	384,135
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	0	0
Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	553,667	582,835
Cash and cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	553,667	582,835
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value		8,984
Commercial Paper [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value		8,984
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value		9,970
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value		9,970
U.S. treasury securities | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	158,472	160,085
U.S. treasury securities | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	158,472	160,085
U.S. treasury securities | Long-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	99,060	79,169
U.S. treasury securities | Long-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	99,060	79,169
U.S. agency securities | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	21,313	9,893
U.S. agency securities | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	21,313	9,893
U.S. agency securities | Long-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	8,505	18,468
U.S. agency securities | Long-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	8,505	18,468
Corporate bonds | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	61,867	46,839
Corporate bonds | Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	61,867	46,839
Corporate bonds | Long-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	49,932	50,727
Corporate bonds | Long-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments Fair Value	$ 49,932	$ 50,727

Stockholders' Equity (Details)

Stockholders' Equity (Details)	3 Months Ended
	Mar. 31, 2018USD ($)votes$ / sharesshares	Mar. 31, 2017USD ($)$ / sharesshares	Apr. 26, 2018USD ($)	Dec. 31, 2017$ / sharesshares	Nov. 01, 2016USD ($)
Class of Stock [Line Items]
Preferred Stock, Shares Authorized | shares	10,000,000			10,000,000
Preferred Stock, Par Value (in usd per share) | $ / shares	$ 0.0001			$ 0.0001
Stock Repurchase Program, Authorized Amount					$ 200,000,000
Stock Repurchased and Retired During Period, Shares | shares	366,160	383,411
Stock Repurchased, Average Cost Per Share | $ / shares	$ 81.95	$ 52.18
Stock Repurchased and Retired During Period, Value	$ 30,000,000	$ 20,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 70,000,000
Stock Repurchased And Retired, Shares | shares	2,077,105
Stock Repurchased And Retired, Value	$ 130,000,000
Class B common stock
Class of Stock [Line Items]
Common Stock, Shares Authorized | shares	75,000,000			75,000,000
Common Stock, Par Value (in usd per share) | $ / shares	$ 0.0001			$ 0.0001
Votes per Share Entitled to Share Holder | votes	10
Class A common stock
Class of Stock [Line Items]
Common Stock, Shares Authorized | shares	750,000,000			750,000,000
Common Stock, Par Value (in usd per share) | $ / shares	$ 0.0001			$ 0.0001
Votes per Share Entitled to Share Holder | votes	1
Subsequent Event [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 370,000,000
Stock Repurchase Program, Increase to Authorized Amount			$ 300,000,000

Revenue (Details)

Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Amortization period, deferred commissions	4 years
Deferred Costs, Current	$ 8.9

Revenue (Balance Sheet) (Detail

Revenue (Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents	$ 623,994	$ 627,878	$ 954,649	$ 908,717
Short-term investments	241,652	226,787
Accounts receivable, net of allowance for doubtful accounts of $972 and $1,003	132,611	203,366
Prepaid Expense and Other Assets, Current	98,461	30,514
Income taxes receivable	883	673
Assets, Current	1,097,601	1,089,218
Long-term investments	157,497	148,364
Property and equipment, net	101,121	106,753
Goodwill	35,083	35,083
Deferred income taxes	4,215	5,287
Other long-term assets	35,139	14,090
Assets	1,430,656	1,398,795
Accounts payable	2,817	4,448
Accrued compensation and employee-related benefits	81,268	96,390
Other accrued liabilities	41,935	37,722
Income taxes payable	4,467	4,743
Deferred revenue	314,698	419,426
Liabilities, Current	445,185	562,729
Deferred revenue	21,687	28,058
Other long-term liabilities	53,911	54,385
Liabilities	520,783	645,172
Common stock	8	8
Additional paid-in capital	1,205,459	1,168,563
Accumulated other comprehensive loss	(10,571)	(11,991)
Accumulated deficit	(285,023)	(402,957)
Stockholders' Equity Attributable to Parent	909,873	753,623
Liabilities and Equity	1,430,656	1,398,795
Impacts from Adoption | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents	0	0
Short-term investments	0
Accounts receivable, net of allowance for doubtful accounts of $972 and $1,003	0
Prepaid Expense and Other Assets, Current	(68,249)
Income taxes receivable	0
Assets, Current	(68,249)
Long-term investments	0
Property and equipment, net	0
Goodwill	0
Deferred income taxes	1,589
Other long-term assets	(21,264)
Assets	(87,924)
Accounts payable	0
Accrued compensation and employee-related benefits	0
Other accrued liabilities	0
Income taxes payable	1,826
Deferred revenue	104,407
Liabilities, Current	106,233
Deferred revenue	5,521
Other long-term liabilities	(746)
Liabilities	111,008
Common stock	0
Additional paid-in capital	0
Accumulated other comprehensive loss	(1,972)
Accumulated deficit	(196,960)
Stockholders' Equity Attributable to Parent	(198,932)
Liabilities and Equity	(87,924)
Without Adoption (ASC 605)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents	623,994	$ 627,878
Short-term investments	241,652
Accounts receivable, net of allowance for doubtful accounts of $972 and $1,003	132,611
Prepaid Expense and Other Assets, Current	30,212
Income taxes receivable	883
Assets, Current	1,029,352
Long-term investments	157,497
Property and equipment, net	101,121
Goodwill	35,083
Deferred income taxes	5,804
Other long-term assets	13,875
Assets	1,342,732
Accounts payable	2,817
Accrued compensation and employee-related benefits	81,268
Other accrued liabilities	41,935
Income taxes payable	6,293
Deferred revenue	419,105
Liabilities, Current	551,418
Deferred revenue	27,208
Other long-term liabilities	53,165
Liabilities	631,791
Common stock	8
Additional paid-in capital	1,205,459
Accumulated other comprehensive loss	(12,543)
Accumulated deficit	(481,983)
Stockholders' Equity Attributable to Parent	710,941
Liabilities and Equity	$ 1,342,732

Revenue (Income Statement) (Det

Revenue (Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
License	$ 108,793	$ 97,244
Maintenance and services	137,414	102,662
Revenues	246,207	199,906
License	3,954	3,267
Maintenance and services	28,471	23,388
Cost of Revenue	32,425	26,655
Gross Profit	213,782	173,251
Sales and marketing	138,406	118,018
Research and development	93,505	84,302
General and administrative	32,250	24,445
Operating Expenses	264,161	226,765
Operating Income (Loss)	(50,379)	(53,514)
Other income, net	1,462	1,225
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(48,917)	(52,289)
Income tax expense (benefit)	(2,445)	2,358
Net loss	(46,472)	$ (54,647)
Impacts from Adoption | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
License	(3,127)
Maintenance and services	(19,036)
Revenues	(22,163)
License	(52)
Maintenance and services	61
Cost of Revenue	9
Gross Profit	(22,172)
Sales and marketing	4,607
Research and development	0
General and administrative	0
Operating Expenses	4,607
Operating Income (Loss)	(26,779)
Other income, net	(38)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(26,817)
Income tax expense (benefit)	5,737
Net loss	(32,554)
Without Adoption (ASC 605)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
License	105,666
Maintenance and services	118,378
Revenues	224,044
License	3,902
Maintenance and services	28,532
Cost of Revenue	32,434
Gross Profit	191,610
Sales and marketing	143,013
Research and development	93,505
General and administrative	32,250
Operating Expenses	268,768
Operating Income (Loss)	(77,158)
Other income, net	1,424
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(75,734)
Income tax expense (benefit)	3,300
Net loss	$ (79,026)

Revenue (Comprehensive Income)

Revenue (Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	$ (46,472)	$ (54,647)
Foreign currency translation	586	(824)
Net unrealized loss on available-for-sale securities	(849)	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(46,735)	$ (55,471)
Impacts from Adoption | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(32,554)
Foreign currency translation	(289)
Net unrealized loss on available-for-sale securities	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(32,843)
Without Adoption (ASC 605)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(79,026)
Foreign currency translation	297
Net unrealized loss on available-for-sale securities	(849)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (79,578)

Revenue (Cash Flow) (Details)

Revenue (Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	$ (46,472)	$ (54,647)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	9,647	13,435
Accretion (Amortization) of Discounts and Premiums, Investments	(118)	0
Stock-based compensation expense	55,763	49,195
Deferred income taxes	(4,226)	128
Changes in operating assets and liabilities
Increase (Decrease) in Accounts Receivable	(73,012)	(76,878)
Increase (Decrease) in Prepaid Expense and Other Assets	22,891	(11,270)
Increase (Decrease) in Income Taxes Receivable	194	(6)
Deferred revenue	(7,507)	4,008
Accounts payable and accrued liabilities	(4,279)	(16,620)
Income taxes payable	(356)	842
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	52,615	84,495
Investing activities
Payments to Acquire Property, Plant, and Equipment	5,251	23,238
Payments to Acquire Available-for-sale Securities	102,450	0
Maturities of investments	77,385	0
Sales of investments	99	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(30,217)	(23,238)
Financing activities
Proceeds from issuance of common stock	2,492	4,309
Payments for Repurchase of Common Stock	30,007	20,008
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(27,515)	(15,699)
Effect of exchange rate changes on cash and cash equivalents	1,233	374
Cash, Period Increase (Decrease)	(3,884)	45,932
Cash and cash equivalents
Beginning of period	627,878	908,717
End of period	623,994	$ 954,649
Impacts from Adoption | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(32,554)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	0
Accretion (Amortization) of Discounts and Premiums, Investments	0
Stock-based compensation expense	0
Deferred income taxes	3,869
Changes in operating assets and liabilities
Increase (Decrease) in Accounts Receivable	0
Increase (Decrease) in Prepaid Expense and Other Assets	(23,230)
Increase (Decrease) in Income Taxes Receivable	0
Deferred revenue	3,521
Accounts payable and accrued liabilities	0
Income taxes payable	1,825
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(109)
Investing activities
Payments to Acquire Property, Plant, and Equipment	0
Payments to Acquire Available-for-sale Securities	0
Maturities of investments	0
Sales of investments	0
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	0
Financing activities
Proceeds from issuance of common stock	0
Payments for Repurchase of Common Stock	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	0
Effect of exchange rate changes on cash and cash equivalents	109
Cash, Period Increase (Decrease)	0
Cash and cash equivalents
Beginning of period	0
End of period	0
Without Adoption (ASC 605)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(79,026)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization expense	9,647
Accretion (Amortization) of Discounts and Premiums, Investments	(118)
Stock-based compensation expense	55,763
Deferred income taxes	(357)
Changes in operating assets and liabilities
Increase (Decrease) in Accounts Receivable	(73,012)
Increase (Decrease) in Prepaid Expense and Other Assets	(339)
Increase (Decrease) in Income Taxes Receivable	194
Deferred revenue	(3,986)
Accounts payable and accrued liabilities	(4,279)
Income taxes payable	1,469
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	52,506
Investing activities
Payments to Acquire Property, Plant, and Equipment	5,251
Payments to Acquire Available-for-sale Securities	102,450
Maturities of investments	77,385
Sales of investments	99
Net Cash Provided by (Used in) Investing Activities, Continuing Operations	(30,217)
Financing activities
Proceeds from issuance of common stock	2,492
Payments for Repurchase of Common Stock	30,007
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(27,515)
Effect of exchange rate changes on cash and cash equivalents	1,342
Cash, Period Increase (Decrease)	(3,884)
Cash and cash equivalents
Beginning of period	627,878
End of period	$ 623,994

Revenue (Contract Assets and Li

Revenue (Contract Assets and Liabilities) (Details) - Contract Asset [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018
Capitalized Contract Cost [Line Items]
Balances at December 31, 2017	$ 0
Adoption of ASC 606		$ (40,854)
Contract assets transferred to receivables	1,315
Additions to contract assets	21,127
Balances at March 31, 2018	$ 60,666

Revenue (Deferred Revenue) (Det

Revenue (Deferred Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018
Contract Asset [Member]
Capitalized Contract Cost [Line Items]
Adoption of ASC 606		$ (40,854)
Deferred Revenue [Member]
Capitalized Contract Cost [Line Items]
Balances at December 31, 2017	$ 447,484
Adoption of ASC 606		$ (105,933)
Deferred revenue recognized	(120,820)
Additional amounts deferred	115,654
Balances at March 31, 2018	$ 336,385

Revenue (Deferred Commissions)

Revenue (Deferred Commissions) (Details) - Deferred Commissions [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018
Capitalized Contract Cost [Line Items]
Balances at December 31, 2017	$ 0
Adoption of ASC 606		$ 25,489
Capitalized Contract Cost, Gross	6,736
Amortization of deferred contract costs	(2,048)
Balances at March 31, 2018	$ 30,177

Revenue (Performance Obligation

Revenue (Performance Obligations) (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 93.1
Total to be recognized [Domain]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 114.5

Stock-Based Compensation (Detai

Stock-Based Compensation (Details - Narrative) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
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 [Line Items]
Unrecognized compensation expense	$ 519.1
Recognition period (in years)	2 years 10 months 24 days
2013 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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 (Det42

Stock-Based Compensation (Details - Options) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)$ / sharesshares
Shares
Options Outstanding, Shares, Beginning of Period | shares	3,017,113
Options Outstanding, Shares, Options Exercised | shares	(216,308)
Options Outstanding, Shares, End of Period | shares	2,800,805
Options Outstanding, Shares, Vested and Expected to Vest | shares	2,800,805
Options Outstanding, Shares, Exercisable | shares	2,753,930
Weighted Average Exercise Price Per Share
Options Outstanding, Weighted Average Exercise Price, Beginning of Period, USD per Share | $ / shares	$ 10.13
Options Outstanding, Weighted Average Exercise Price, Options Exercised, USD per Share | $ / shares	11.52
Options Outstanding, Weighted Average Exercise Price, End of Period, USD per Share | $ / shares	10.03
Options Outstanding, Weighted Average Exercise Price Per Share, Vested and Expected to Vest, USD per Share | $ / shares	10.03
Options Outstanding, Weighted Average Exercise Price Per Share, Exercisable, USD per Share | $ / shares	$ 9.26
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)	4 years 1 month 2 days
Options Outstanding, Weighted Average Remaining Contractual Term, Vested and Expected to Vest (in years)	4 years 1 month 2 days
Options Outstanding, Weighted Average Remaining Contractual Term, Exercisable (in years)	4 years 3 days
Options Outstanding, Aggregate Intrinsic Value, End of Period | $	$ 198,276
Options Outstanding, Aggregate Intrinsic Value, Vested and Expected to Vest | $	198,276
Options Outstanding, Aggregate Intrinsic Value, Exercisable | $	$ 197,059

Stock Based Compensation (Detai

Stock Based Compensation (Details - RSUs) - RSUs	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Number of Shares Underlying Outstanding RSUs
RSU Shares Outstanding, Beginning of Period | shares	7,178,015
RSUs granted, Shares | shares	2,376,440
RSUs vested, Shares | shares	(1,222,641)
RSUs forfeited, Shares | shares	(238,327)
RSU Shares Outstanding, End of Period | shares	8,093,487
Weighted-Average Grant-Date Fair Value per RSU
Weighted Average Fair Value, Beginning of Period, USD per Share | $ / shares	$ 62.79
Weighted Average Fair Value, RSUs Granted, USD per Share | $ / shares	83.32
Weighted Average Fair Value, RSUs Vested, USD per Share | $ / shares	65.24
Weighted Average Fair Value, RSUs Forfeited, USD per Share | $ / shares	63.38
Weighted Average Fair Value, End of Period, USD per Share | $ / shares	$ 68.43

Stock-Based Compensation (Det44

Stock-Based Compensation (Details - Shares Available) - 2013 Plan	3 Months Ended
	Mar. 31, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards, Outstanding [Roll Forward]
Equity Based Awards, Beginning of Period, Shares	7,207,291
Authorized, Shares	4,023,117
Granted, Shares	(2,376,440)
Forfeited, Shares	238,327
Equity Based Awards, End of Period, Shares	9,092,295

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Expense Benefit [Line Items]
Effective tax rate	5.00%	(4.50%)
Income tax expense (benefit)	$ (2,445)	$ 2,358
Without Adoption (ASC 605)
Income Tax Expense Benefit [Line Items]
Effective tax rate	(4.30%)
Income tax expense (benefit)	$ 3,300

Commitments and Contingencies46

Commitments and Contingencies (Details) $ in Thousands	Mar. 31, 2018USD ($)
Operating Lease Commitments
Operating Lease Commitments, Remainder of 2017	$ 33,177
Operating Lease Commitments, 2018	41,480
Operating Lease Commitments, 2019	43,138
Operating Lease Commitments, 2020	43,603
Operating Lease Commitments, 2021	43,216
Operating Lease Commitments, Thereafter	176,759
Operating Lease Commitments, Total	381,373
Expected Sublease Receipts
Expected Sublease Receipts, Remainder of 2017	(6,793)
Expected Sublease Receipts, 2018	(10,606)
Expected Sublease Receipts, 2019	(7,113)
Expected Sublease Receipts, 2020	(1,180)
Expected Sublease Receipts, 2021	(597)
Expected Sublease Receipts, Thereafter	(121)
Expected Sublease Receipts, Total	(26,410)
Net
Net, Remainder of 2017	26,384
Net, 2018	30,874
Net, 2019	36,025
Net, 2020	42,423
Net, 2021	42,619
Net, Thereafter	176,638
Net, Total	$ 354,963

Segments and Information abou47

Segments and Information about Revenues by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 246,207	$ 199,906
United States and Canada
Segment Reporting Information [Line Items]
Revenues	167,799	141,496
International
Segment Reporting Information [Line Items]
Revenues	78,408	$ 58,410
Without Adoption (ASC 605)
Segment Reporting Information [Line Items]
Revenues	224,044
Without Adoption (ASC 605) | United States and Canada
Segment Reporting Information [Line Items]
Revenues	154,443
Without Adoption (ASC 605) | International
Segment Reporting Information [Line Items]
Revenues	69,601
Impacts from Adoption | Accounting Standards Update 2014-09 [Member]
Segment Reporting Information [Line Items]
Revenues	(22,163)
Impacts from Adoption | Accounting Standards Update 2014-09 [Member] | United States and Canada
Segment Reporting Information [Line Items]
Revenues	(13,356)
Impacts from Adoption | Accounting Standards Update 2014-09 [Member] | International
Segment Reporting Information [Line Items]
Revenues	$ (8,807)

Net Income (Loss) Per Share (De

Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net loss per share - basic and diluted
Net loss	$ (46,472)	$ (54,647)
Weighted average shares outstanding used to compute basic and diluted net loss per share	81,039	77,416
Net loss per share - basic and diluted (in usd per share)	$ (0.57)	$ (0.71)
Antidilutive shares excluded from computation of diluted net loss	11,193	12,658
Without Adoption (ASC 605)
Net loss per share - basic and diluted
Net loss	$ (79,026)
Weighted average shares outstanding used to compute basic and diluted net loss per share	81,039
Net loss per share - basic and diluted (in usd per share)	$ (0.98)