ServiceNow (NOW) 10-Q 3 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information shares in Millions	3 Months Ended
	Mar. 31, 2019shares
Document and Entity Information [Abstract]
Document Type	10-Q
Entity Registrant Name	SERVICENOW, INC.
Trading Symbol	NOW
Entity Central Index Key	0001373715
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding	184.7

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 639,722	$ 566,204
Short-term investments		1,022,391	931,718
Accounts receivable, net		422,559	574,810
Current portion of deferred commissions		144,629	139,890
Prepaid expenses and other current assets		145,185	132,071
Total current assets		2,374,486	2,344,693
Deferred commissions, less current portion		283,124	282,490
Long-term investments		674,633	581,856
Property and equipment, net	[1]	350,651	347,216
Operating lease right-of-use assets	[1]	393,561
Intangible assets, net		93,252	100,582
Goodwill		151,184	148,845
Other assets		78,004	73,458
Total assets		4,398,895	3,879,140
Current liabilities:
Accounts payable		38,668	30,733
Accrued expenses and other current liabilities	[1]	306,161	330,246
Current portion of deferred revenue		1,711,060	1,651,594
Current portion of operating lease liabilities	[1]	41,952
Total current liabilities		2,097,841	2,012,573
Deferred revenue, less current portion		36,722	38,597
Operating lease liabilities, less current portion	[1]	380,944
Convertible senior notes, net		669,875	661,707
Other long-term liabilities	[1]	18,562	55,064
Total liabilities		3,203,944	2,767,941
Stockholders’ equity:
Common stock		185	180
Additional paid-in capital		2,164,930	2,093,834
Accumulated other comprehensive income (loss)		10,323	(4,035)
Accumulated deficit	[1]	(980,487)	(978,780)
Total stockholders’ equity		1,194,951	1,111,199
Total liabilities and stockholders’ equity		$ 4,398,895	$ 3,879,140
[1]	We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our condensed consolidated financial statements in the year of adoption. See Note 2 for further details.

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues		$ 788,926	$ 589,222
Cost of revenues:
Total cost of revenues	[1]	186,252	143,473
Gross profit		602,674	445,749
Operating expenses:
Sales and marketing	[1]	361,409	283,701
Research and development	[1]	172,522	117,268
General and administrative	[1]	84,456	65,063
Total operating expenses	[1]	618,387	466,032
Loss from operations		(15,713)	(20,283)
Interest expense		(8,168)	(17,064)
Interest income and other income (expense), net		12,425	29,987
Loss before income taxes		(11,456)	(7,360)
Benefit from income taxes		(9,911)	(17,982)
Net income (loss)		$ (1,545)	$ 10,622
Net income (loss) per share - basic (in dollars per share)		$ (0.01)	$ 0.06
Net income (loss) per share - diluted (in dollars per share)		$ (0.01)	$ 0.06
Weighted-average shares used to compute net income (loss) per share - basic (in shares)		182,061,579	175,482,833
Weighted-average shares used to compute net income (loss) per share - diluted (in shares)		182,061,579	190,249,786
Other comprehensive income (loss):
Foreign currency translation adjustments		$ 9,635	$ (8,435)
Unrealized gain (loss) on investments, net of tax		4,723	(3,068)
Other comprehensive income (loss), net of tax		14,358	(11,503)
Comprehensive income (loss)		12,813	(881)
Subscription
Revenues:
Total revenues		739,986	543,325
Cost of revenues:
Total cost of revenues	[1]	126,589	95,398
Professional services and other
Revenues:
Total revenues		48,940	45,897
Cost of revenues:
Total cost of revenues	[1]	$ 59,663	$ 48,075
[1]	Includes stock-based compensation as follows: Three Months Ended March 31, 2019 2018 Cost of revenues: Subscription $ 16,022 $ 11,291 Professional services and other 9,931 7,561 Sales and marketing 62,130 52,082 Research and development 43,582 28,598 General and administrative 25,785 21,809

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stock-based compensation	$ 157,450	$ 121,341
Cost of revenues | Subscription
Stock-based compensation	16,022	11,291
Cost of revenues | Professional services and other
Stock-based compensation	9,931	7,561
Sales and marketing
Stock-based compensation	62,130	52,082
Research and development
Stock-based compensation	43,582	28,598
General and administrative
Stock-based compensation	$ 25,785	$ 21,809

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment for ASU adoption | Accounting Standards Update 2016-01	$ 0			$ 7,234	$ (7,234)
Cumulative effect adjustment for ASU adoption | Accounting Standards Update 2016-16	(746)			(746)
Beginning balance (in shares) at Dec. 31, 2017		174,275,864
Beginning balance at Dec. 31, 2017	$ 778,744	$ 174	$ 1,731,367	(958,564)	5,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee stock plans (in shares)	2,287,099	2,287,099
Common stock issued under employee stock plans	$ 52,661	$ 3	52,658
Taxes paid related to net share settlement of equity awards	(85,617)		(85,617)
Stock-based compensation	121,709		121,709
Stock Issued During Period, Value, Conversion of Convertible Securities	(45,217)		(45,217)
Benefit from exercise of 2018 Note Hedges	44,510		44,510
Other comprehensive income (loss), net	(11,503)				(11,503)
Net income (loss)	10,622			10,622
Beginning balance (in shares) at Mar. 31, 2018		176,562,963
Beginning balance at Mar. 31, 2018	865,163	$ 177	1,819,410	(941,454)	(12,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment for ASU adoption | Accounting Standards Update 2016-02	(162)			(162)
Beginning balance (in shares) at Dec. 31, 2018		180,175,355
Beginning balance at Dec. 31, 2018	$ 1,111,199	$ 180	2,093,834	(978,780)	(4,035)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee stock plans (in shares)	1,882,821	1,882,821
Common stock issued under employee stock plans	$ 53,102	$ 2	53,100
Taxes paid related to net share settlement of equity awards	(139,470)		(139,470)
Stock-based compensation	157,469		157,469
Settlement of 2018 Warrants (in shares)		2,680,993
Settlement of 2018 Warrants and 2018 Notes conversion feature	0	$ 3	(3)
Other comprehensive income (loss), net	14,358				14,358
Net income (loss)	(1,545)			(1,545)
Beginning balance (in shares) at Mar. 31, 2019		184,739,169
Beginning balance at Mar. 31, 2019	$ 1,194,951	$ 185	$ 2,164,930	$ (980,487)	$ 10,323

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (1,545)	$ 10,622
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	55,449	33,411
Amortization of deferred commissions	39,557	30,419
Amortization of debt discount and issuance costs	8,168	17,064	$ 17,064
Stock-based compensation	157,450	121,341
Deferred income taxes	(1,480)	(24,348)
Gain on marketable equity securities	0	(18,455)
Repayments of convertible senior notes attributable to debt discount	0	(8,660)
Other	724	(5,805)
Changes in operating assets and liabilities:
Accounts receivable	151,105	69,502
Deferred commissions	(46,599)	(42,475)
Prepaid expenses and other assets	(33,659)	(15,808)
Accounts payable	6,562	875
Deferred revenue	61,370	83,733
Accrued expenses and other liabilities	(36,254)	(1,336)
Net cash provided by operating activities	360,848	250,080
Cash flows from investing activities:
Purchases of property and equipment	(47,124)	(35,371)
Purchases of other intangibles	0	(7,850)
Purchases of investments	(438,498)	(376,130)
Purchases of strategic investments	(284)	0
Sales of investments	6,576	0
Maturities of investments	256,309	182,105
Realized gains on derivatives not designated as hedging instruments, net	22,148	0
Net cash used in investing activities	(200,873)	(237,246)
Cash flows from financing activities:
Repayments of convertible senior notes attributable to principal	0	(28,606)
Proceeds from employee stock plans	53,093	52,657
Taxes paid related to net share settlement of equity awards	(139,493)	(85,555)
Payments on financing obligations	0	(288)
Net cash used in financing activities	(86,400)	(61,792)
Foreign currency effect on cash, cash equivalents and restricted cash	1,079	6,491
Net increase (decrease) in cash, cash equivalents and restricted cash	74,654	(42,467)
Cash, cash equivalents and restricted cash at beginning of period	568,538	727,829	727,829
Cash, cash equivalents and restricted cash at end of period	643,192	685,362	568,538
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents				$ 639,722	$ 566,204	$ 682,854
Current portion of restricted cash included in prepaid expenses and other current assets				3,470		2,508
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	568,538	727,829	$ 568,538	$ 643,192	$ 568,538	$ 685,362
Non-cash investing and financing activities:
Settlement of 2018 Notes conversion feature	0	45,217
Benefit from exercise of 2018 Note Hedges	0	44,510
Property and equipment included in accounts payable and accrued expenses	$ 29,002	$ 24,288

Description of the Business

Description of the Business	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	Description of the Business ServiceNow, the company that makes work, work better for people, is a leading provider of enterprise cloud computing services that define, structure, manage and automate digital workflows for global enterprises. We deliver digital workflows that help our customers create great experiences and unlock productivity.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with the applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (GAAP) for complete financial statements due to the permitted exclusion of certain disclosures for interim reporting. In the opinion of management, all adjustments (consisting of normal recurring items) considered necessary under GAAP for fair statement of results for the interim periods presented have been included. The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019 or for other interim periods or future years. The condensed consolidated balance sheet as of December 31, 2018 is derived from audited financial statements; however, it does not include all of the information and footnotes required by GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2018 , which was filed with the SEC on February 27, 2019. Principles of Consolidation The condensed consolidated financial statements have been prepared in conformity with GAAP, and include our accounts and the accounts of our wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated upon consolidation. Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, as well as reported amounts of revenues and expenses during the reporting period. Such management estimates and assumptions include, but are not limited to, evaluating the terms and conditions included within our customer contracts as well as determining stand-alone selling price (SSP) for each distinct performance obligation included in customer contracts with multiple performance obligations, the period of benefit for deferred commissions, purchase price allocation for business combinations, stock-based compensation expenses, the useful life and recoverability of our property and equipment, goodwill and identifiable intangible assets, whether an arrangement is or contains a lease, the discount rate used for operating leases, fair value of convertible notes, income taxes, and legal contingencies. Actual results could differ from those estimates. Segments We define the term “chief operating decision maker” to be our Chief Executive Officer. Our chief operating decision maker allocates resources and assesses financial performance based upon discrete financial information at the consolidated level. Accordingly, we have determined that we operate as a single operating and reportable segment. Concentration of Credit Risk and Significant Customers Financial instruments potentially exposing us to credit risk consist primarily of cash, cash equivalents, derivative contracts, investments and accounts receivable. We hold cash at financial institutions that management believes are high credit, quality financial institutions and invest in securities with a minimum rating of BBB by Standard & Poor’s, Baa2 by Moody’s, or BBB by Fitch to minimize our credit risks. Our derivative contracts expose us to credit risk to the extent that the counterparties may be unable to meet the terms of the arrangement. We mitigate this credit risk by transacting with major financial institutions with high credit ratings and entering into master netting arrangements, which permit net settlement of transactions with the same counterparty. While the contract or notional amount is often used to express the volume of foreign currency derivative contracts, the amounts potentially subject to credit risk are generally limited to the amounts, if any, by which the counterparties’ obligations under the agreements exceed the obligations of the Company to the counterparties. We are not required to pledge, and are not entitled to receive, cash collateral related to these derivative instruments. We are also exposed to credit risk under the convertible note hedge transactions that may result from counterparties’ non-performance. Credit risk arising from accounts receivable is mitigated due to our large number of customers and their dispersion across various industries and geographies. As of March 31, 2019 , we had one customer that represented approximately 13% of our accounts receivable balance. As of December 31, 2018 , there were no customers that represented more than 10% of our accounts receivable balance. There were no customers that individually exceeded 10% of our total revenues in any of the periods presented. For purposes of assessing concentration of credit risk and significant customers, a group of customers under common control or customers that are affiliates of each other are regarded as a single customer. Updated Significant Accounting Policies Leases In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02, “Leases (Topic 842),” which requires lessees to generally recognize on the balance sheet operating and financing lease liabilities and corresponding right-of-use assets, and to recognize on the income statement the expenses in a manner similar to prior practice. We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our financial statements in the year of adoption. We also elected the package of transition expedients available for expired or existing contracts, which allowed us to carryforward our historical assessment of (1) whether contracts are or contain leases, (2) lease classification and (3) initial direct costs. We determine if an arrangement is or contains a lease at inception by evaluating various factors, including whether a vendor’s right to substitute an identified asset is substantive. Lease classification is determined at the lease commencement date, on which the leased assets are made available for our use. Operating leases are included in “Operating lease right-of-use assets”, “Current portion of operating lease liabilities”, and “Operating lease liabilities, less current portion” in our condensed consolidated balance sheets. We did not have any material financing leases in any of the periods presented. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The difference between the total right-of-use assets and total lease liabilities recorded as of January 1, 2019 is primarily due to the derecognition of deferred rent liabilities that were included in “Accrued expenses and other current liabilities” and “Other long-term liabilities”, respectively, in our condensed consolidated balance sheet as of December 31, 2018. Lease payments consist primarily of the fixed payments under the arrangement, less any lease incentives such as rent holidays. We use an estimate of our incremental borrowing rate (IBR) based on the information available at the lease commencement date in determining the present value of lease payments, unless the implicit rate is readily determinable. In determining the appropriate IBR, we consider information including, but not limited to, our credit rating, the lease term, and the currency in which the arrangement is denominated. For leases which commenced prior to our adoption of Topic 842, we used the IBR on January 1, 2019. Our lease terms may include the sole option for us to either renew or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. For our office facility leases, we elected to account for lease and non-lease components as a single lease component. For other arrangements, lease and non-lease components are generally accounted for separately. Additionally, we do not record leases on the balance sheet that, at the lease commencement date, have a lease term of 12 months or less. Derivative financial instruments and hedging activities We use derivative financial instruments to manage foreign currency risks. These derivative contracts consist of forward contracts entered into with various counterparties and are not designated as hedging instruments under applicable accounting guidance. As such, all changes in the fair value of these derivative contracts are recorded in “Interest income and other income (expense), net” on the condensed consolidated statements of comprehensive income (loss), and are intended to offset the foreign currency gains or losses associated with the underlying monetary assets and liabilities. Realized gains (losses) from settlement of the derivative assets and liabilities are classified as investing activities in the condensed consolidated statement of cash flows. Accounting Pronouncement Adopted in 2019 Leases As described in the “Leases” section above, we adopted Topic 842 using the modified retrospective method as of January 1, 2019 with an immaterial amount of cumulative effect adjustment recorded to our accumulated deficit as of January 1, 2019. As this standard was adopted on a modified prospective basis as of January 1, 2019, the adoption of this standard did not impact our previously reported financial statements for periods ended on or prior to December 31, 2018. Accounting Pronouncements Adopted in 2018 For details on our adoption of ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” ASU 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory” and other accounting standards adopted in 2018, refer to Note 2, Summary of Significant Accounting Policies, of the notes to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 , which was filed with the SEC on February 27, 2019. New Accounting Pronouncements Pending Adoption Cloud computing arrangements implementation costs In August 2018, the FASB issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new standard requires capitalized costs to be amortized on a straight-line basis generally over the term of the arrangement, and the financial statement presentation for these capitalized costs would be the same as that of the fees related to the hosting arrangements. This new standard is effective for our interim and annual periods beginning January 1, 2020 and earlier adoption is permitted. This standard could be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We will adopt this standard on a prospective basis as of January 1, 2020 and are evaluating the impact of our pending adoption of this standard on our condensed consolidated financial statements. Credit losses

Investments

Investments	3 Months Ended
	Mar. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Investments	Investments Marketable Debt Securities The following is a summary of our available-for-sale investment securities, excluding marketable equity securities and those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): March 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 137,523 $ 101 $ (6 ) $ 137,618 Corporate notes and bonds 1,405,920 2,955 (903 ) 1,407,972 Certificates of deposit 60,337 43 — 60,380 U.S. government and agency securities 91,162 49 (157 ) 91,054 Total available-for-sale securities $ 1,694,942 $ 3,148 $ (1,066 ) $ 1,697,024 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 108,061 $ — $ — $ 108,061 Corporate notes and bonds 1,233,589 343 (4,218 ) 1,229,714 Certificates of deposit 73,584 1 — 73,585 U.S. government and agency securities 102,549 23 (358 ) 102,214 Total available-for-sale securities $ 1,517,783 $ 367 $ (4,576 ) $ 1,513,574 As of March 31, 2019 , the contractual maturities of our investment securities, excluding securities classified within cash and cash equivalents on the condensed consolidated balance sheets, did not exceed 36 months . The fair values of available-for-sale investment securities, by remaining contractual maturity, are as follows (in thousands): March 31, 2019 Due within 1 year $ 1,022,391 Due in 1 year through 5 years 674,633 Total $ 1,697,024 The following table shows the fair values and the gross unrealized losses of these securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): March 31, 2019 Less than 12 Months 12 Months or Greater Total Fair Value Gross Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Commercial paper $ 35,844 $ (6 ) $ — $ — $ 35,844 $ (6 ) Corporate notes and bonds 255,199 (243 ) 296,220 (660 ) 551,419 (903 ) Certificates of deposit 2,050 — — — 2,050 — U.S. government and agency securities 3,389 — 50,156 (157 ) 53,545 (157 ) Total $ 296,482 $ (249 ) $ 346,376 $ (817 ) $ 642,858 $ (1,066 ) December 31, 2018 Less than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate notes and bonds $ 714,605 $ (2,603 ) $ 294,956 $ (1,615 ) $ 1,009,561 $ (4,218 ) Certificates of deposit 1,000 — — — 1,000 — U.S. government and agency securities 11,756 (5 ) 61,457 (353 ) 73,213 (358 ) Total $ 727,361 $ (2,608 ) $ 356,413 $ (1,968 ) $ 1,083,774 $ (4,576 ) As of March 31, 2019 , we had a total of 239 available-for-sale securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheet in an unrealized loss position. There were no impairments considered “other-than-temporary” as it is more likely than not we will hold the securities until maturity or a recovery of the cost basis. Marketable Equity Securities During the three months ended March 31, 2018 , we recognized $18.5 million of unrealized gains through net income that related to the changes in the fair value of these securities during the three months ended March 31, 2018 . As of each of March 31, 2019 and December 31, 2018 , we had no marketable equity securities on our condensed consolidated balance sheet. Strategic Investments As of March 31, 2019 and December 31, 2018 , the total amount of equity investments in privately-held companies included in other assets on our condensed consolidated balance sheets was $14.9 million and $14.6 million

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of March 31, 2019 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 330,113 $ — $ 330,113 Commercial paper — 67,733 67,733 Certificates of deposit — 15,351 15,351 Marketable securities: Commercial paper — 137,618 137,618 Corporate notes and bonds — 1,407,972 1,407,972 Certificates of deposit — 60,380 60,380 U.S. government and agency securities — 91,054 91,054 Total $ 330,113 $ 1,780,108 $ 2,110,221 The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of December 31, 2018 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 229,047 $ — $ 229,047 Commercial paper — 16,961 16,961 Certificates of deposit — 2,465 2,465 Marketable securities: Commercial paper — 108,061 108,061 Corporate notes and bonds — 1,229,714 1,229,714 Certificates of deposit — 73,585 73,585 U.S. government and agency securities — 102,214 102,214 Total $ 229,047 $ 1,533,000 $ 1,762,047 We determine the fair value of our security holdings based on pricing from our service providers and market prices from industry-standard independent data providers. Such market prices may be quoted prices in active markets for identical assets (Level 1 inputs) or pricing determined using inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs), such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill balances are presented below (in thousands): Carrying Amount Balance as of December 31, 2018 $ 148,845 Foreign currency translation adjustments 2,339 Balance as of March 31, 2019 $ 151,184 Intangible assets consist of the following (in thousands): March 31, December 31, 2019 2018 Developed technology $ 113,759 $ 114,395 Patents 57,180 57,180 Other 650 650 Total intangible assets 171,589 172,225 Less: accumulated amortization (78,337 ) (71,643 ) Net carrying amount $ 93,252 $ 100,582 Amortization expense for intangible assets for the three months ended March 31, 2019 and 2018 was approximately $7.0 million and $5.7 million , respectively. The following table presents the estimated future amortization expense related to intangible assets held at March 31, 2019 (in thousands): Years Ending December 31, Remainder of 2019 $ 21,861 2020 19,371 2021 17,336 2022 13,673 2023 7,764 Thereafter 13,247 Total future amortization expense $ 93,252

Property and Equipment

Property and Equipment	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment, net consists of the following (in thousands): March 31, December 31, 2019 2018 Computer equipment $ 532,371 $ 493,536 Computer software 61,270 58,303 Leasehold and other improvements 84,429 74,721 Furniture and fixtures 43,565 42,551 Building (1) — 6,551 Construction in progress (1) 3,527 10,167 725,162 685,829 Less: Accumulated depreciation (374,511 ) (338,613 ) Total property and equipment, net $ 350,651 $ 347,216 (1) We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and derecognized $10.6 million in building and construction in progress assets that we were previously deemed to own under the prior lease accounting standards. These assets are recognized under our operating lease right-of-use assets under Topic 842 as of March 31, 2019 . Construction in progress consists primarily of leasehold and other improvements and in-process software development costs. Depreciation expense for the three months ended March 31, 2019 and 2018 was $37.1 million and $27.7 million

Derivative Contracts

Derivative Contracts	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Contracts	Derivative Contracts As of March 31, 2019 and December 31, 2018 , we had derivative contracts with total notional values of $1.2 billion and $883.9 million , respectively, which are not designated as hedge instruments. Our foreign currency contracts are classified within Level 2 because the valuation inputs are based on quoted prices and market observable data of similar instruments in active markets, such as currency spot and forward rates. The fair values of these outstanding derivative contracts were as follows (in thousands): Condensed Consolidated Balance Sheet Location March 31, 2019 December 31, 2018 Derivative Assets: Foreign currency derivative contracts Prepaid expenses and other current assets $ 4,216 $ 22,831 Derivative Liabilities Foreign currency derivative contracts Accrued expenses and other current liabilities $ 3,279 $ 2,441

Deferred Revenue and Performanc

Deferred Revenue and Performance Obligations	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Performance Obligations	Deferred Revenue and Performance Obligations Revenues recognized during the three months ended March 31, 2019 from amounts included in deferred revenue as of December 31, 2018 were $569.9 million . Revenues recognized during the three months ended March 31, 2018 , from amounts included in deferred revenue as of December 31, 2017 were $479.2 million . Transaction Price Allocated to the Remaining Performance Obligations Transaction price allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes deferred revenue and non-cancelable amounts that will be invoiced and recognized as revenues in future periods. We apply the practical expedient in accordance with Topic 606 to exclude amounts related to professional services contracts that are on a time-and-material basis. Our professional services contracts typically have a remaining duration of one year or less. As of March 31, 2019 , the total remaining non-cancelable performance obligations under our contracts with customers was approximately $5.1 billion and we expect to recognize revenues on approximately 50% of these remaining performance obligations over the following 12 months

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	3 Months Ended
	Mar. 31, 2019
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands): March 31, 2019 December 31, 2018 Accrued payroll 143,431 158,006 Taxes payable 20,529 35,122 Other employee related liabilities 43,255 60,889 Other 98,946 76,229 Total accrued expenses and other current liabilities $ 306,161 $ 330,246

Convertible Senior Notes

Convertible Senior Notes	3 Months Ended
	Mar. 31, 2019
Convertible Notes Payable [Abstract]
Convertible Senior Notes	Convertible Senior Notes In May and June 2017, we issued an aggregate of $782.5 million of 0% convertible senior notes (the 2022 Notes), which are due June 1, 2022 (Maturity Date) unless earlier converted or repurchased in accordance with their terms. The 2022 Notes do not bear interest, and we cannot redeem the 2022 Notes prior to maturity. In November 2013 , we issued $575.0 million of 0% convertible senior notes (the 2018 Notes, and together with the 2022 Notes, the Notes), which were earlier converted prior to, or settled on November 1, 2018, in accordance with their terms. The 2022 Notes are unsecured obligations and do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by us or any of our subsidiaries. Upon conversion of the 2022 Notes, we may choose to pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock upon settlement. We settled the principal amount of our 2018 Notes with cash and currently intend to settle the principal amount of the 2022 Notes with cash. Convertible Date Initial Conversion Price per Share Initial Conversion Rate per $1,000 Par Value Initial Number of Shares 2022 Notes February 1, 2022 $ 134.75 7.42 shares 5,806,936 2018 Notes July 1, 2018 $ 73.88 13.54 shares 7,783,023 Conversion of the 2022 Notes prior to the Convertible Date . At any time prior to the close of business on the business day immediately preceding February 1, 2022 (Convertible Date), holders of the 2022 Notes may convert their Notes at their option, only if one of the following conditions are met: • during any calendar quarter (and only during such calendar quarter) if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the applicable conversion price on each applicable trading day (in each case, the Conversion Condition); or • during the five -business day period after any five -consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the applicable conversion rate on each such trading day; or • upon the occurrence of specified corporate events. Conversion of the 2022 Notes on or after the Convertible Date. On or after the Convertible Date, a holder may convert all or any portion of its Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the Maturity Date, regardless of the foregoing conditions, and such conversions will settle upon the Maturity Date. Upon settlement, we will pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election. The conversion price of the 2022 Notes will be subject to adjustment in some events. Holders of the 2022 Notes who convert their 2022 Notes in connection with certain corporate events that constitute a “make-whole fundamental change” are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a “fundamental change,” holders of the 2022 Notes may require us to purchase with cash all or a portion of the 2022 Notes upon the occurrence of a fundamental change, at a purchase price equal to 100% of the principal amount of the 2022 Notes plus any accrued and unpaid special interest, if any. In accounting for the issuance of the 2022 Notes and the related transaction costs, we separated the 2022 Notes into liability and equity components. The 2022 Notes consisted of the following (in thousands): March 31, 2019 December 31, 2018 Liability component: Principal: 2022 Notes $ 782,500 $ 782,500 Less: debt issuance cost and debt discount, net of amortization 2022 Notes (112,625 ) (120,793 ) Net carrying amount $ 669,875 $ 661,707 2022 Notes Equity component recorded at issuance: Note $ 162,039 Issuance cost (2,148 ) Net amount recorded in equity $ 159,891 The Conversion Condition for the 2022 Notes was met for the quarters ended June 30, 2018, September 30, 2018 and March 31, 2019. Therefore, our 2022 Notes became convertible at the holders’ option beginning on July 1, 2018 and continued to be convertible through June 30, 2019, with the exception of the quarter ended March 31, 2019 because the Conversion Condition for the 2022 Notes was not met for the quarter ended December 31, 2018. We have not received any conversion requests for our 2022 Notes. We consider the fair value of the 2022 Notes at March 31, 2019 to be a Level 2 measurement. The estimated fair value of the 2022 Notes at March 31, 2019 and December 31, 2018 based on the closing trading price per $100 of the Notes were as follows (in thousands): March 31, 2019 December 31, 2018 2022 Notes $ 1,444,847 $ 1,105,281 As of March 31, 2019 , the remaining life of the 2022 Notes is 38 months, and the 2018 Notes were no longer outstanding. The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended March 31, 2019 2018 Amortization of debt issuance cost 2022 Notes $ 394 $ 376 2018 Notes — 498 Amortization of debt discount 2022 Notes 7,774 7,402 2018 Notes — 8,788 Total $ 8,168 $ 17,064 Effective interest rate of the liability component 2022 Notes 4.75% 2018 Notes 6.50% Note Hedges To minimize the impact of potential economic dilution upon conversion of the Notes, we entered into convertible note hedge transactions (the 2022 Note Hedge and 2018 Note Hedge, respectively, and collectively, the Note Hedges) with certain investment banks, with respect to our common stock concurrently with the issuance of the 2022 Notes and 2018 Notes. The 2018 Note Hedge offset the dilution and cash payments in excess of the principal amount of the converted 2018 Notes and expired upon the maturity date of the 2018 Notes, which was November 1, 2018. Purchase Initial Shares Shares as of March 31, 2019 (in thousands) 2022 Note Hedge $ 128,017 5,806,936 5,806,936 2018 Note Hedge $ 135,815 7,783,023 — The 2022 Note Hedge covers shares of our common stock at a strike price per share that corresponds to the initial conversion price of the 2022 Notes, subject to adjustment, and are exercisable upon conversion of the 2022 Notes. If exercised, we may elect to receive cash, shares of our common stock, or a combination of cash and shares. The 2022 Note Hedge will expire upon the maturity of the 2022 Notes. The 2022 Note Hedge is intended to reduce the potential economic dilution upon conversion of the 2022 Notes in the event that the fair value per share of our common stock at the time of exercise is greater than the conversion price of the 2022 Notes. The 2022 Note Hedge is a separate transaction and is not part of the terms of the 2022 Notes. Holders of the 2022 Notes will not have any rights with respect to the 2022 Note Hedge. The 2022 Note Hedge does not impact earnings per share, as it was entered into to offset any dilution from the 2022 Notes. Warrants Proceeds Initial Shares Strike Price First Expiration Date Shares as of March 31, 2019 (in thousands) 2022 Warrants $ 54,071 5,806,936 $ 203.40 September 1, 2022 5,806,936 2018 Warrants $ 84,525 7,783,023 $ 107.46 February 1, 2019 2,853,811 Separately, we entered into warrant transactions with certain investment banks, whereby we sold warrants to acquire, subject to adjustment, the number of shares of our common stock shown in the table above (the 2022 Warrants and 2018 Warrants, respectively, and collectively, the Warrants). If the average market value per share of our common stock for the reporting period, as measured under the Warrants, exceeds the strike price of the respective Warrants, such Warrants would have a dilutive effect on our earnings per share to the extent we report net income. According to the terms of each of the Warrants, the Warrants will be automatically exercised over a 60 trading day period beginning on the first expiration date of the respective Warrants as set forth above. The Warrants are separate transactions and are not remeasured through earnings each reporting period. The Warrants are not part of the Notes or Note Hedges. As the remaining 2018 Warrants and the 2022 Warrants will be net share settled, the total number of shares of our common stock we will issue depends on the daily volume-weighted average stock prices over a 60 trading day period beginning on the first expiration date of the 2018 Warrants, which was February 1, 2019, and the first expiration date of the 2022 Warrants, which will be September 1, 2022. We issued approximately 2.7 million shares of our common stock upon the automatic exercise of a portion of the 2018 Warrants during the three months ended March 31, 2019 and approximately 1.6 million shares of our common stock upon the automatic exercise of the remaining 2018 Warrants during the quarter ending June 30, 2019. As of the date of the issuance of these condensed consolidated financial statements, the 2018 Warrants are no longer outstanding. We expect to issue additional shares of our common stock in the second half of 2022 upon the automatic exercise of the 2022 Warrants. The 2022 Warrants could have a dilutive effect to the extent that the daily volume-weighted average stock prices over a 60 trading day period beginning on September 1, 2022 exceeds the strike price of the 2022 Warrants. Based on the volume-weighted average stock price on March 31, 2019 , the total number of shares of our common stock to be issued upon the automatic exercise of the 2022 Warrants would be approximately 1.0 million . The actual number of shares of our common stock issuable upon the automatic exercise of the 2022 Warrants, if any, is unknown at this time.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive (loss) income, net of tax, consist of the following (in thousands): March 31, 2019 December 31, 2018 Foreign currency translation adjustment $ 9,979 $ 344 Net unrealized gain (loss) on investments, net of tax 344 (4,379 ) Accumulated other comprehensive income (loss) $ 10,323 $ (4,035 )

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Common Stock We are authorized to issue 600,000,000 shares of common stock as of March 31, 2019 . Holders of our common stock are not entitled to receive dividends unless declared by our board of directors. As of March 31, 2019 , we had 184,739,169 shares of common stock outstanding and had reserved shares of common stock for future issuance as follows: March 31, 2019 Stock plans: Options outstanding 1,579,022 RSUs (1) 12,161,981 Shares of common stock available for future grants: 2012 Equity Incentive Plan (2) 28,705,526 2012 Employee Stock Purchase Plan (2) 10,396,547 Total shares of common stock reserved for future issuance 52,843,076 (1) Represents the number of shares issuable upon settlement of outstanding RSUs and performance RSUs, assuming 100% of the target number of shares for performance RSUs, as discussed under the section entitled “RSUs” in Note 13. (2) Refer to Note 13 for a description of these plans. During the three months ended March 31, 2019 and 2018 , we issued a total of 1,882,821 shares and 2,287,099 shares, respectively, from stock option exercises, vesting of restricted stock units (RSUs), net of employee payroll taxes, and purchases from the employee stock purchase plan (ESPP). As described in Note 10, we issued approximately 2.7 million shares of our common stock upon the automatic exercise of a portion of the 2018 Warrants during the three months ended March 31, 2019

Equity Awards

Equity Awards	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Awards	Equity Awards We currently have two equity incentive plans, our 2005 Stock Option Plan (the 2005 Plan) and our 2012 Equity Incentive Plan (the 2012 Plan). Our 2005 Plan was terminated in connection with our initial public offering in 2012 but continues to govern the terms of outstanding stock options that were granted prior to the termination of the 2005 Plan. We no longer grant equity awards pursuant to our 2005 Plan. Our 2012 Plan provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, RSUs, performance-based stock awards and other forms of equity compensation (collectively, equity awards). In addition, the 2012 Plan provides for the grant of performance cash awards. Incentive stock options may be granted only to employees. All other equity awards may be granted to employees, including officers, as well as directors and consultants. The share reserve may increase to the extent outstanding stock options under the 2005 Plan expire or terminate unexercised. Prior to January 2019, the share reserve also automatically increased on January 1 of each year, by up to 5% of the total number of shares of common stock outstanding on December 31 of the preceding year as determined by our board of directors. Our board of directors elected not to increase the number of shares of common stock reserved for issuance under the 2012 Plan pursuant to the provision described in the preceding sentence for the year ending December 31, 2019 . In January 2019, our Board of Directors amended the 2012 Plan to remove the automatic increase provision. Therefore, for the remaining term of the 2012 Plan, the share reserve will not be increased without stockholder approval. Our 2012 Employee Stock Purchase Plan (the 2012 ESPP) authorizes the issuance of shares of common stock pursuant to purchase rights granted to our employees. The price at which common stock is purchased under the 2012 ESPP is equal to 85% of the fair market value of our common stock on the first or last day of the offering period, whichever is lower. Offering periods are six months long and begin on February 1 and August 1 of each year. The number of shares of common stock reserved for issuance automatically increases on January 1 of each year until January 1, 2022, by up to 1% of the total number of shares of common stock outstanding on December 31 of the preceding year as determined by our board of directors. Our board of directors elected not to increase the number of shares of common stock reserved for issuance under the 2012 ESPP pursuant to the provision described in the preceding sentence for the year ending December 31, 2019 . Stock Options Stock options are exercisable at a price equal to the market value of the underlying shares of common stock on the date of the grant as determined by our board of directors or, for those stock options issued subsequent to our initial public offering, the closing price of our common stock as reported on the New York Stock Exchange on the date of grant. Stock options granted under our 2005 Plan and the 2012 Plan to new employees generally vest 25% one year from the date the requisite service period begins and continue to vest monthly for each month of continued employment over the remaining three years . Options granted generally are exercisable for a period of up to ten years contingent on each holder’s continuous status as a service provider. A summary of stock option activity for the three months ended March 31, 2019 was as follows: Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 1,810,580 $ 46.55 Exercised (231,558 ) 21.69 $ 46,348 Outstanding at March 31, 2019 1,579,022 $ 50.19 5.24 $ 309,955 Vested and expected to vest as of March 31, 2019 1,574,667 $ 50.13 5.23 $ 309,205 Vested and exercisable as of March 31, 2019 1,147,276 $ 37.62 4.29 $ 239,629 Aggregate intrinsic value represents the difference between the estimated fair value of our common stock and the exercise price of outstanding, in-the-money options. The total fair value of stock options vested during the three months ended March 31, 2019 was $2.0 million . As of March 31, 2019 , total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options was approximately $9.8 million . The weighted-average remaining vesting period of unvested stock options at March 31, 2019 was 2.09 years . RSUs A summary of RSU activity for the three months ended March 31, 2019 was as follows: Number of Shares Weighted Average Grant Date Fair Value (Per Share) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 10,201,660 $ 121.84 Granted 4,257,565 233.78 Vested (1,939,925 ) 117.30 $ 445,764 Forfeited (357,319 ) 121.26 Outstanding at March 31, 2019 12,161,981 $ 160.28 $ 2,997,807 RSUs outstanding as of March 31, 2019 comprise 11,167,127 RSUs with only a service condition and 994,854 RSUs with both a service condition and a performance condition. RSUs granted with only service vesting criteria under the 2012 Plan to employees generally vest over a four -year period. As of March 31, 2019 , total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested RSUs was approximately $1.5 billion and the weighted-average remaining vesting period was 3.24 years . Included in the RSU activity table above are shares granted to certain employees with both service and performance-based vesting criteria. These performance-based RSUs (PRSUs) are considered as eligible to vest when approved by the compensation committee of our board of directors in January of the year following the grant. The ultimate number of shares eligible to vest for PRSUs range from 0% to 180% of the target number of shares depending on achievement relative to the performance metric over the applicable period. The eligible shares subject to PRSUs granted during the three months ended March 31, 2019 will vest 33% in February 2020 and continue to vest quarterly for the remaining two subsequent years, contingent on each holder’s continuous status as a service provider on the applicable vesting dates. The number of PRSUs granted shown in the table above reflects the shares that could be eligible to vest at 100% of target for PRSUs and includes adjustments for over or under achievement for PRSUs granted in the prior year. We recognized $22.6 million and $15.6 million of stock-based compensation expense, net of actual and estimated forfeitures, associated with PRSUs on a graded vesting basis during the three months ended March 31, 2019 and 2018

Net Income (Loss) Per Share

Net Income (Loss) Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) Per Share Basic net income (loss) per share attributable to common stockholders is computed by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, adjusted for the effects of dilutive shares of common stock, which are comprised of outstanding stock options, RSUs, ESPP obligations, the Notes and the Warrants. Stock awards with performance conditions are included in dilutive shares to the extent the performance condition is met. The dilutive potential shares of common stock are computed using the treasury stock method or the as-if converted method, as applicable. The effects of outstanding stock options, RSUs, ESPP obligations, Notes and Warrants are excluded from the computation of diluted net income (loss) per share in periods in which the effect would be antidilutive. The following tables present the calculation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except share and per share data): Three Months Ended March 31, 2019 2018 Numerator: Net income (loss) $ (1,545 ) $ 10,622 Denominator: Weighted-average shares outstanding - basic 182,061,579 175,482,833 Weighted-average effect of potentially dilutive securities: Common stock options — 1,995,185 RSUs — 5,869,792 ESPP obligations — 7,510 In-the-money portion of 2018 Notes — 3,794,221 2018 Warrants — 2,363,658 In-the-money portion of 2022 Notes — 736,587 Weighted-average shares outstanding - diluted 182,061,579 190,249,786 Net income (loss) per share - basic $ (0.01 ) $ 0.06 Net income (loss) per share - diluted $ (0.01 ) $ 0.06 Potentially dilutive securities that are not included in the calculation of diluted net income (loss) per share because doing so would be antidilutive are as follows: Three Months Ended March 31, 2019 2018 Common stock options 1,579,022 — RSUs 12,161,981 38,114 ESPP obligations 211,771 — 2018 Warrants 2,853,811 — 2022 Notes 5,806,936 — 2022 Warrants 5,806,936 5,806,933 Total potentially dilutive securities 28,420,457 5,845,047

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We compute our provision for income taxes by applying the estimated annual effective tax rate to year-to-date loss from recurring operations and adjust the provision for discrete tax items recorded in the period. Our income tax benefit was $9.9 million for the three months ended March 31, 2019 . The income tax benefit was primarily attributable to forecasted foreign cash taxes and mix of earnings and losses in countries with differing statutory tax rates. Our income tax benefit was $18.0 million for the three months ended March 31, 2018 . The income tax benefit was primarily attributable to the indirect effect of Topic 606 on income taxes associated with intercompany adjustments. We maintain a full valuation allowance against our U.S. and certain foreign deferred tax assets as of March 31, 2019 . We regularly assess the need for a valuation allowance against our deferred tax assets. In making that assessment, we consider both positive and negative evidence related to the likelihood of realization of the deferred tax assets to determine, based on the weight of available evidence, whether it is more likely than not that some or all of the deferred tax assets will not be realized. Due to cumulative losses over recent years and based on all available evidence, we have determined that it is more likely than not that our U.S. and certain foreign deferred tax assets will not be realized as of March 31, 2019 . Due to our international expansion and improvements in the operating results of our Irish subsidiary over the past three years, we believe a reasonable possibility exists that within the next 12 months, sufficient positive evidence may become available to reach a conclusion that the valuation allowance against our Irish net deferred tax assets will no longer be needed. Assuming a consistent performance over the next few quarters, a release of the Irish valuation allowance would result in the recognition of certain deferred tax assets and may result in an income tax benefit in excess of $500 million for the period in which such release is recorded. We are subject to taxation in the United States and foreign jurisdictions. As of March 31, 2019 , our tax years 2004 to 2018 remain subject to examination in most jurisdictions.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases For some of our offices and data centers, we have entered into non-cancelable operating lease agreements with various expiration dates through February 28, 2035 . Certain lease agreements include options to renew or terminate the lease, which are not reasonably certain to be exercised and therefore are not factored into our determination of lease payments. Total operating lease costs was $14.7 million , excluding short-term leases costs, variable lease costs and sublease income each of which were immaterial for the three months ended March 31, 2019 . Total lease expenses recognized prior to our adoption of Topic 842 was $11.4 million for the three months ended March 31, 2018 . For the three months ended March 31, 2019 , cash paid for amounts included in the measurement of operating lease liabilities was $10.0 million and operating lease liabilities arising from obtaining operating right of-use assets totaled $67.7 million . As of March 31, 2019 , the weighted-average remaining lease term is 10.5 years , and the weighted-average discount rate is 3.9% . Maturities of operating lease liabilities as of March 31, 2019 are presented in the table below (in thousands): Years Ending December 31, Remainder of 2019 $ 44,266 2020 59,080 2021 57,605 2022 55,098 2023 50,564 Thereafter 259,664 Total operating lease payments 526,277 Less: imputed interest (103,381 ) Present value of operating lease liabilities $ 422,896 In addition to the amounts above, as of March 31, 2019 , we have operating leases, primarily for offices, that have not yet commenced with undiscounted cash flows of $413.4 million . These operating leases will commence between 2019 and 2022 with lease terms of three years to 15 years . Future minimum commitments under our non-cancelable operating leases as of December 31, 2018 are presented in the table below (in thousands): Years Ending December 31, 2019 $ 55,435 2020 60,996 2021 63,348 2022 67,707 2023 72,491 Thereafter 578,874 Total 898,851 Other Contractual Commitments Other contractual commitments consist of data center and IT operations and sales and marketing activities. There were no material contractual obligations that were entered into during the three months ended March 31, 2019 that were outside the ordinary course of business. In addition to the amounts above, the repayment of our 2022 Notes with an aggregate principal amount of $782.5 million is due on June 1, 2022. Refer to Note 10 for further information regarding our Notes. In addition to the obligations in the table above, approximately $4.8 million of unrecognized tax benefits have been recorded as liabilities as of March 31, 2019 . Letters of Credit As of March 31, 2019 , we had letters of credit in the aggregate amount of $21.3 million , primarily in connection with our customer contracts and operating leases. Legal Proceedings From time to time, we are party to litigation and other legal proceedings in the ordinary course of business. While the results of any litigation or other legal proceedings are uncertain, management does not believe the ultimate resolution of any pending legal matters is likely to have a material adverse effect on our financial position, results of operations or cash flows, except for those matters for which we have recorded a loss contingency. We accrue for loss contingencies when it is both probable that we will incur the loss and when we can reasonably estimate the amount of the loss or range of loss.

Information about Geographic Ar

Information about Geographic Areas and Products	3 Months Ended
	Mar. 31, 2019
Segments, Geographical Areas [Abstract]
Information about Geographic Areas and Products	Information about Geographic Areas and Products Revenues by geographic area, based on the location of our users, were as follows for the periods presented (in thousands): Three Months Ended March 31, 2019 2018 North America (1) $ 525,551 $ 387,473 EMEA (2) 193,832 152,426 Asia Pacific and other 69,543 49,323 Total revenues $ 788,926 $ 589,222 Property and equipment, net by geographic area were as follows (in thousands): March 31, 2019 December 31, 2018 North America (3) $ 226,935 $ 227,471 EMEA (2) 80,478 82,526 Asia Pacific and other 43,238 37,219 Total property and equipment, net $ 350,651 $ 347,216 (1) Revenues attributed to the United States were approximately 94% and 95% of North America revenues for the three months ended March 31, 2019 and 2018 , respectively. (2) Europe, the Middle East and Africa (3) Property and equipment, net attributed to the United States were approximately 76% of property and equipment, net attributable to North America as of each of March 31, 2019 and December 31, 2018 . Subscription revenues consist of the following (in thousands): Three Months Ended March 31, 2019 2018 Digital workflow products $ 638,657 $ 462,562 ITOM products 101,329 80,763 Total subscription revenues $ 739,986 $ 543,325 Our digital workflow products include our platform, IT service management, IT business management, customer service management, HR service delivery, security operations, IT asset management, field service management, and governance, risk and compliance, and are generally priced on a per user basis. Our IT operations management (ITOM) products are generally priced on a per node basis.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events As discussed in Note 10, we issued approximately 1.6 million shares of our common stock upon the automatic exercise of the remaining 2018 Warrants during the quarter ending June 30, 2019. As of the date of the issuance of these condensed consolidated financial statements, the 2018 Warrants are no longer outstanding. On April 29, 2019, Michael P. Scarpelli notified us of his decision to resign from his position as Chief Financial Officer after the release of our earnings for the second quarter of 2019. We have initiated a search for Mr. Scarpelli’s successor.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with the applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (GAAP) for complete financial statements due to the permitted exclusion of certain disclosures for interim reporting. In the opinion of management, all adjustments (consisting of normal recurring items) considered necessary under GAAP for fair statement of results for the interim periods presented have been included. The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019 or for other interim periods or future years. The condensed consolidated balance sheet as of December 31, 2018 is derived from audited financial statements; however, it does not include all of the information and footnotes required by GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2018
Principles of Consolidation	Principles of Consolidation
Use of Estimates	Use of Estimates
Segments	Segments We define the term “chief operating decision maker” to be our Chief Executive Officer. Our chief operating decision maker allocates resources and assesses financial performance based upon discrete financial information at the consolidated level. Accordingly, we have determined that we operate as a single operating and reportable segment.
Concentration of Credit Risk and Significant Customers	Concentration of Credit Risk and Significant Customers Financial instruments potentially exposing us to credit risk consist primarily of cash, cash equivalents, derivative contracts, investments and accounts receivable. We hold cash at financial institutions that management believes are high credit, quality financial institutions and invest in securities with a minimum rating of BBB by Standard & Poor’s, Baa2 by Moody’s, or BBB by Fitch to minimize our credit risks. Our derivative contracts expose us to credit risk to the extent that the counterparties may be unable to meet the terms of the arrangement. We mitigate this credit risk by transacting with major financial institutions with high credit ratings and entering into master netting arrangements, which permit net settlement of transactions with the same counterparty. While the contract or notional amount is often used to express the volume of foreign currency derivative contracts, the amounts potentially subject to credit risk are generally limited to the amounts, if any, by which the counterparties’ obligations under the agreements exceed the obligations of the Company to the counterparties. We are not required to pledge, and are not entitled to receive, cash collateral related to these derivative instruments. We are also exposed to credit risk under the convertible note hedge transactions that may result from counterparties’ non-performance. Credit risk arising from accounts receivable is mitigated due to our large number of customers and their dispersion across various industries and geographies. As of March 31, 2019 , we had one customer that represented approximately 13% of our accounts receivable balance. As of December 31, 2018 , there were no customers that represented more than 10% of our accounts receivable balance. There were no
Updated Significant Accounting Policies, New Accounting Pronouncements Adopted in 2019, and New Accounting Pronouncements Pending Adoption	Updated Significant Accounting Policies Leases In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02, “Leases (Topic 842),” which requires lessees to generally recognize on the balance sheet operating and financing lease liabilities and corresponding right-of-use assets, and to recognize on the income statement the expenses in a manner similar to prior practice. We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our financial statements in the year of adoption. We also elected the package of transition expedients available for expired or existing contracts, which allowed us to carryforward our historical assessment of (1) whether contracts are or contain leases, (2) lease classification and (3) initial direct costs. We determine if an arrangement is or contains a lease at inception by evaluating various factors, including whether a vendor’s right to substitute an identified asset is substantive. Lease classification is determined at the lease commencement date, on which the leased assets are made available for our use. Operating leases are included in “Operating lease right-of-use assets”, “Current portion of operating lease liabilities”, and “Operating lease liabilities, less current portion” in our condensed consolidated balance sheets. We did not have any material financing leases in any of the periods presented. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The difference between the total right-of-use assets and total lease liabilities recorded as of January 1, 2019 is primarily due to the derecognition of deferred rent liabilities that were included in “Accrued expenses and other current liabilities” and “Other long-term liabilities”, respectively, in our condensed consolidated balance sheet as of December 31, 2018. Lease payments consist primarily of the fixed payments under the arrangement, less any lease incentives such as rent holidays. We use an estimate of our incremental borrowing rate (IBR) based on the information available at the lease commencement date in determining the present value of lease payments, unless the implicit rate is readily determinable. In determining the appropriate IBR, we consider information including, but not limited to, our credit rating, the lease term, and the currency in which the arrangement is denominated. For leases which commenced prior to our adoption of Topic 842, we used the IBR on January 1, 2019. Our lease terms may include the sole option for us to either renew or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. For our office facility leases, we elected to account for lease and non-lease components as a single lease component. For other arrangements, lease and non-lease components are generally accounted for separately. Additionally, we do not record leases on the balance sheet that, at the lease commencement date, have a lease term of 12 months or less. Derivative financial instruments and hedging activities We use derivative financial instruments to manage foreign currency risks. These derivative contracts consist of forward contracts entered into with various counterparties and are not designated as hedging instruments under applicable accounting guidance. As such, all changes in the fair value of these derivative contracts are recorded in “Interest income and other income (expense), net” on the condensed consolidated statements of comprehensive income (loss), and are intended to offset the foreign currency gains or losses associated with the underlying monetary assets and liabilities. Realized gains (losses) from settlement of the derivative assets and liabilities are classified as investing activities in the condensed consolidated statement of cash flows. Accounting Pronouncement Adopted in 2019 Leases As described in the “Leases” section above, we adopted Topic 842 using the modified retrospective method as of January 1, 2019 with an immaterial amount of cumulative effect adjustment recorded to our accumulated deficit as of January 1, 2019. As this standard was adopted on a modified prospective basis as of January 1, 2019, the adoption of this standard did not impact our previously reported financial statements for periods ended on or prior to December 31, 2018. Accounting Pronouncements Adopted in 2018 For details on our adoption of ASU 2016-01, “Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,” ASU 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory” and other accounting standards adopted in 2018, refer to Note 2, Summary of Significant Accounting Policies, of the notes to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 , which was filed with the SEC on February 27, 2019. New Accounting Pronouncements Pending Adoption Cloud computing arrangements implementation costs In August 2018, the FASB issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new standard requires capitalized costs to be amortized on a straight-line basis generally over the term of the arrangement, and the financial statement presentation for these capitalized costs would be the same as that of the fees related to the hosting arrangements. This new standard is effective for our interim and annual periods beginning January 1, 2020 and earlier adoption is permitted. This standard could be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We will adopt this standard on a prospective basis as of January 1, 2020 and are evaluating the impact of our pending adoption of this standard on our condensed consolidated financial statements. Credit losses
Fair Value Measurements	We determine the fair value of our security holdings based on pricing from our service providers and market prices from industry-standard independent data providers. Such market prices may be quoted prices in active markets for identical assets (Level 1 inputs) or pricing determined using inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs), such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.
Legal Proceedings	From time to time, we are party to litigation and other legal proceedings in the ordinary course of business. While the results of any litigation or other legal proceedings are uncertain, management does not believe the ultimate resolution of any pending legal matters is likely to have a material adverse effect on our financial position, results of operations or cash flows, except for those matters for which we have recorded a loss contingency. We accrue for loss contingencies when it is both probable that we will incur the loss and when we can reasonably estimate the amount of the loss or range of loss. Generally, our subscription agreements require us to defend our customers for third-party intellectual property infringement and other claims. Any adverse determination related to intellectual property claims or other litigation could prevent us from offering our services and adversely affect our financial condition and results of operations.

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Schedule of Marketable Debt Securities	The following is a summary of our available-for-sale investment securities, excluding marketable equity securities and those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): March 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 137,523 $ 101 $ (6 ) $ 137,618 Corporate notes and bonds 1,405,920 2,955 (903 ) 1,407,972 Certificates of deposit 60,337 43 — 60,380 U.S. government and agency securities 91,162 49 (157 ) 91,054 Total available-for-sale securities $ 1,694,942 $ 3,148 $ (1,066 ) $ 1,697,024 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 108,061 $ — $ — $ 108,061 Corporate notes and bonds 1,233,589 343 (4,218 ) 1,229,714 Certificates of deposit 73,584 1 — 73,585 U.S. government and agency securities 102,549 23 (358 ) 102,214 Total available-for-sale securities $ 1,517,783 $ 367 $ (4,576 ) $ 1,513,574
Investments Classified by Contractual Maturity Date	The fair values of available-for-sale investment securities, by remaining contractual maturity, are as follows (in thousands): March 31, 2019 Due within 1 year $ 1,022,391 Due in 1 year through 5 years 674,633 Total $ 1,697,024
Fair Values and Gross Unrealized Losses of Available-for-Sale Securities Aggregated by Investment Category	The following table shows the fair values and the gross unrealized losses of these securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): March 31, 2019 Less than 12 Months 12 Months or Greater Total Fair Value Gross Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Commercial paper $ 35,844 $ (6 ) $ — $ — $ 35,844 $ (6 ) Corporate notes and bonds 255,199 (243 ) 296,220 (660 ) 551,419 (903 ) Certificates of deposit 2,050 — — — 2,050 — U.S. government and agency securities 3,389 — 50,156 (157 ) 53,545 (157 ) Total $ 296,482 $ (249 ) $ 346,376 $ (817 ) $ 642,858 $ (1,066 ) December 31, 2018 Less than 12 Months 12 Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate notes and bonds $ 714,605 $ (2,603 ) $ 294,956 $ (1,615 ) $ 1,009,561 $ (4,218 ) Certificates of deposit 1,000 — — — 1,000 — U.S. government and agency securities 11,756 (5 ) 61,457 (353 ) 73,213 (358 ) Total $ 727,361 $ (2,608 ) $ 356,413 $ (1,968 ) $ 1,083,774 $ (4,576 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on Recurring Basis	The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of March 31, 2019 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 330,113 $ — $ 330,113 Commercial paper — 67,733 67,733 Certificates of deposit — 15,351 15,351 Marketable securities: Commercial paper — 137,618 137,618 Corporate notes and bonds — 1,407,972 1,407,972 Certificates of deposit — 60,380 60,380 U.S. government and agency securities — 91,054 91,054 Total $ 330,113 $ 1,780,108 $ 2,110,221 The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of December 31, 2018 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 229,047 $ — $ 229,047 Commercial paper — 16,961 16,961 Certificates of deposit — 2,465 2,465 Marketable securities: Commercial paper — 108,061 108,061 Corporate notes and bonds — 1,229,714 1,229,714 Certificates of deposit — 73,585 73,585 U.S. government and agency securities — 102,214 102,214 Total $ 229,047 $ 1,533,000 $ 1,762,047

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill balances are presented below (in thousands): Carrying Amount Balance as of December 31, 2018 $ 148,845 Foreign currency translation adjustments 2,339 Balance as of March 31, 2019 $ 151,184
Schedule of Intangible Assets	Intangible assets consist of the following (in thousands): March 31, December 31, 2019 2018 Developed technology $ 113,759 $ 114,395 Patents 57,180 57,180 Other 650 650 Total intangible assets 171,589 172,225 Less: accumulated amortization (78,337 ) (71,643 ) Net carrying amount $ 93,252 $ 100,582
Schedule of Estimated Future Amortization Expense Related to Intangible Assets	The following table presents the estimated future amortization expense related to intangible assets held at March 31, 2019 (in thousands): Years Ending December 31, Remainder of 2019 $ 21,861 2020 19,371 2021 17,336 2022 13,673 2023 7,764 Thereafter 13,247 Total future amortization expense $ 93,252

Property and Equipment (Tables)

Property and Equipment (Tables)	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Summary of Property and Equipment, Net	Property and equipment, net consists of the following (in thousands): March 31, December 31, 2019 2018 Computer equipment $ 532,371 $ 493,536 Computer software 61,270 58,303 Leasehold and other improvements 84,429 74,721 Furniture and fixtures 43,565 42,551 Building (1) — 6,551 Construction in progress (1) 3,527 10,167 725,162 685,829 Less: Accumulated depreciation (374,511 ) (338,613 ) Total property and equipment, net $ 350,651 $ 347,216 (1) We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and derecognized $10.6 million in building and construction in progress assets that we were previously deemed to own under the prior lease accounting standards. These assets are recognized under our operating lease right-of-use assets under Topic 842 as of March 31, 2019 .

Derivative Contracts (Tables)

Derivative Contracts (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Values of Outstanding Derivative Contracts	The fair values of these outstanding derivative contracts were as follows (in thousands): Condensed Consolidated Balance Sheet Location March 31, 2019 December 31, 2018 Derivative Assets: Foreign currency derivative contracts Prepaid expenses and other current assets $ 4,216 $ 22,831 Derivative Liabilities Foreign currency derivative contracts Accrued expenses and other current liabilities $ 3,279 $ 2,441

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]
Summary of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consist of the following (in thousands): March 31, 2019 December 31, 2018 Accrued payroll 143,431 158,006 Taxes payable 20,529 35,122 Other employee related liabilities 43,255 60,889 Other 98,946 76,229 Total accrued expenses and other current liabilities $ 306,161 $ 330,246

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	3 Months Ended
	Mar. 31, 2019
Convertible Notes Payable [Abstract]
Summary of Convertible Senior Notes	consisted of the following (in thousands): March 31, 2019 December 31, 2018 Liability component: Principal: 2022 Notes $ 782,500 $ 782,500 Less: debt issuance cost and debt discount, net of amortization 2022 Notes (112,625 ) (120,793 ) Net carrying amount $ 669,875 $ 661,707 2022 Notes Equity component recorded at issuance: Note $ 162,039 Issuance cost (2,148 ) Net amount recorded in equity $ 159,891 The Conversion Condition for the 2022 Notes was met for the quarters ended June 30, 2018, September 30, 2018 and March 31, 2019. Convertible Date Initial Conversion Price per Share Initial Conversion Rate per $1,000 Par Value Initial Number of Shares 2022 Notes February 1, 2022 $ 134.75 7.42 shares 5,806,936 2018 Notes July 1, 2018 $ 73.88 13.54 shares 7,783,023
Schedule of Estimated Fair Values of Convertible Senior Notes	air value of the 2022 Notes at March 31, 2019 and December 31, 2018 based on the closing trading price per $100 of the Notes were as follows (in thousands): March 31, 2019 December 31, 2018 2022 Notes $ 1,444,847 $ 1,105,281
Schedule of Interest Expense Related to Convertible Senior Notes	able sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended March 31, 2019 2018 Amortization of debt issuance cost 2022 Notes $ 394 $ 376 2018 Notes — 498 Amortization of debt discount 2022 Notes 7,774 7,402 2018 Notes — 8,788 Total $ 8,168 $ 17,064 Effective interest rate of the liability component 2022 Notes 4.75% 2018 Notes 6.50% Note Hedges
Schedule of Note Hedges	g
Schedule of Warrants	w

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of Accumulated Other Comprehensive (Loss) Income, Net of Tax	The components of accumulated other comprehensive (loss) income, net of tax, consist of the following (in thousands): March 31, 2019 December 31, 2018 Foreign currency translation adjustment $ 9,979 $ 344 Net unrealized gain (loss) on investments, net of tax 344 (4,379 ) Accumulated other comprehensive income (loss) $ 10,323 $ (4,035 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of Common Stock Outstanding and Reserved Shares of Common Stock for Future Issuance	As of March 31, 2019 , we had 184,739,169 shares of common stock outstanding and had reserved shares of common stock for future issuance as follows: March 31, 2019 Stock plans: Options outstanding 1,579,022 RSUs (1) 12,161,981 Shares of common stock available for future grants: 2012 Equity Incentive Plan (2) 28,705,526 2012 Employee Stock Purchase Plan (2) 10,396,547 Total shares of common stock reserved for future issuance 52,843,076 (1) Represents the number of shares issuable upon settlement of outstanding RSUs and performance RSUs, assuming 100% of the target number of shares for performance RSUs, as discussed under the section entitled “RSUs” in Note 13. (2) Refer to Note 13 for a description of these plans.

Equity Awards (Tables)

Equity Awards (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock Option Activity	A summary of stock option activity for the three months ended March 31, 2019 was as follows: Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 1,810,580 $ 46.55 Exercised (231,558 ) 21.69 $ 46,348 Outstanding at March 31, 2019 1,579,022 $ 50.19 5.24 $ 309,955 Vested and expected to vest as of March 31, 2019 1,574,667 $ 50.13 5.23 $ 309,205 Vested and exercisable as of March 31, 2019 1,147,276 $ 37.62 4.29 $ 239,629
Schedule of Restricted Stock Unit Activity	A summary of RSU activity for the three months ended March 31, 2019 was as follows: Number of Shares Weighted Average Grant Date Fair Value (Per Share) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2018 10,201,660 $ 121.84 Granted 4,257,565 233.78 Vested (1,939,925 ) 117.30 $ 445,764 Forfeited (357,319 ) 121.26 Outstanding at March 31, 2019 12,161,981 $ 160.28 $ 2,997,807

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Loss Per Share	The following tables present the calculation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except share and per share data): Three Months Ended March 31, 2019 2018 Numerator: Net income (loss) $ (1,545 ) $ 10,622 Denominator: Weighted-average shares outstanding - basic 182,061,579 175,482,833 Weighted-average effect of potentially dilutive securities: Common stock options — 1,995,185 RSUs — 5,869,792 ESPP obligations — 7,510 In-the-money portion of 2018 Notes — 3,794,221 2018 Warrants — 2,363,658 In-the-money portion of 2022 Notes — 736,587 Weighted-average shares outstanding - diluted 182,061,579 190,249,786 Net income (loss) per share - basic $ (0.01 ) $ 0.06 Net income (loss) per share - diluted $ (0.01 ) $ 0.06
Schedule of Potentially Dilutive Securities	Potentially dilutive securities that are not included in the calculation of diluted net income (loss) per share because doing so would be antidilutive are as follows: Three Months Ended March 31, 2019 2018 Common stock options 1,579,022 — RSUs 12,161,981 38,114 ESPP obligations 211,771 — 2018 Warrants 2,853,811 — 2022 Notes 5,806,936 — 2022 Warrants 5,806,936 5,806,933 Total potentially dilutive securities 28,420,457 5,845,047

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Payments	Maturities of operating lease liabilities as of March 31, 2019 are presented in the table below (in thousands): Years Ending December 31, Remainder of 2019 $ 44,266 2020 59,080 2021 57,605 2022 55,098 2023 50,564 Thereafter 259,664 Total operating lease payments 526,277 Less: imputed interest (103,381 ) Present value of operating lease liabilities $ 422,896
Schedule of Future Minimum Commitments	Future minimum commitments under our non-cancelable operating leases as of December 31, 2018 are presented in the table below (in thousands): Years Ending December 31, 2019 $ 55,435 2020 60,996 2021 63,348 2022 67,707 2023 72,491 Thereafter 578,874 Total 898,851

Information about Geographic _2

Information about Geographic Areas and Products (Tables)	3 Months Ended
	Mar. 31, 2019
Segments, Geographical Areas [Abstract]
Schedule of Revenues and Property and Equipment, net by Geographic Area	Revenues by geographic area, based on the location of our users, were as follows for the periods presented (in thousands): Three Months Ended March 31, 2019 2018 North America (1) $ 525,551 $ 387,473 EMEA (2) 193,832 152,426 Asia Pacific and other 69,543 49,323 Total revenues $ 788,926 $ 589,222 Property and equipment, net by geographic area were as follows (in thousands): March 31, 2019 December 31, 2018 North America (3) $ 226,935 $ 227,471 EMEA (2) 80,478 82,526 Asia Pacific and other 43,238 37,219 Total property and equipment, net $ 350,651 $ 347,216 (1) Revenues attributed to the United States were approximately 94% and 95% of North America revenues for the three months ended March 31, 2019 and 2018 , respectively. (2) Europe, the Middle East and Africa (3) Property and equipment, net attributed to the United States were approximately 76% of property and equipment, net attributable to North America as of each of March 31, 2019 and December 31, 2018
Schedule of Subscription Revenue	Subscription revenues consist of the following (in thousands): Three Months Ended March 31, 2019 2018 Digital workflow products $ 638,657 $ 462,562 ITOM products 101,329 80,763 Total subscription revenues $ 739,986 $ 543,325

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2019
Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	13.00%

Investments - Summary of Invest

Investments - Summary of Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost	$ 1,694,942	$ 1,517,783
Available-for-sale securities, gross unrealized gains	3,148	367
Available-for-sale securities, gross unrealized losses	(1,066)	(4,576)
Available-for-sale securities, estimated fair value	1,697,024	1,513,574
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost	137,523	108,061
Available-for-sale securities, gross unrealized gains	101	0
Available-for-sale securities, gross unrealized losses	(6)	0
Available-for-sale securities, estimated fair value	137,618	108,061
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost	1,405,920	1,233,589
Available-for-sale securities, gross unrealized gains	2,955	343
Available-for-sale securities, gross unrealized losses	(903)	(4,218)
Available-for-sale securities, estimated fair value	1,407,972	1,229,714
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost	60,337	73,584
Available-for-sale securities, gross unrealized gains	43	1
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	60,380	73,585
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, amortized cost	91,162	102,549
Available-for-sale securities, gross unrealized gains	49	23
Available-for-sale securities, gross unrealized losses	(157)	(358)
Available-for-sale securities, estimated fair value	$ 91,054	$ 102,214

Investments - Additional Inform

Investments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019USD ($)security	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Debt Securities, Available-for-sale [Abstract]
Available-for-sale securities maturities term maximum	36 months
Number of available-for-sale securities in unrealized loss position | security	239
Other than temporary impairment losses, investments, available-for-sale securities	$ 0
Unrealized gains relating to the changes in fair value		$ 18,500,000
Marketable equity securities	0		$ 0
Equity investments in privately-held companies	$ 14,900,000		$ 14,600,000

Investments - Maturities of ava

Investments - Maturities of available-for-sale investments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Due within 1 year	$ 1,022,391
Due in 1 year through 5 years	674,633
Total	$ 1,697,024	$ 1,513,574

Investments - Fair Values and G

Investments - Fair Values and Gross Unrealized Losses of Available-for-Sale Securities Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	$ 296,482	$ 727,361
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(249)	(2,608)
Continuous unrealized loss position, 12 months or greater, fair value	346,376	356,413
Continuous unrealized loss position, 12 months or greater, gross unrealized loss	(817)	(1,968)
Continuous unrealized loss position, fair value	642,858	1,083,774
Continuous unrealized loss position, gross unrealized losses	(1,066)	(4,576)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	35,844
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(6)
Continuous unrealized loss position, 12 months or greater, fair value	0
Continuous unrealized loss position, 12 months or greater, gross unrealized loss	0
Continuous unrealized loss position, fair value	35,844
Continuous unrealized loss position, gross unrealized losses	(6)
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	255,199	714,605
Continuous unrealized loss position, less than 12 months, gross unrealized losses	(243)	(2,603)
Continuous unrealized loss position, 12 months or greater, fair value	296,220	294,956
Continuous unrealized loss position, 12 months or greater, gross unrealized loss	(660)	(1,615)
Continuous unrealized loss position, fair value	551,419	1,009,561
Continuous unrealized loss position, gross unrealized losses	(903)	(4,218)
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	2,050	1,000
Continuous unrealized loss position, less than 12 months, gross unrealized losses	0	0
Continuous unrealized loss position, 12 months or greater, fair value	0	0
Continuous unrealized loss position, 12 months or greater, gross unrealized loss	0	0
Continuous unrealized loss position, fair value	2,050	1,000
Continuous unrealized loss position, gross unrealized losses	0	0
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Continuous unrealized loss position, less than 12 months, fair value	3,389	11,756
Continuous unrealized loss position, less than 12 months, gross unrealized losses	0	(5)
Continuous unrealized loss position, 12 months or greater, fair value	50,156	61,457
Continuous unrealized loss position, 12 months or greater, gross unrealized loss	(157)	(353)
Continuous unrealized loss position, fair value	53,545	73,213
Continuous unrealized loss position, gross unrealized losses	$ (157)	$ (358)

Fair Value Measurements (Detail

Fair Value Measurements (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 2,110,221	$ 1,762,047
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	330,113	229,047
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	1,780,108	1,533,000
Cash equivalents | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	330,113	229,047
Cash equivalents | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	67,733	16,961
Cash equivalents | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	15,351	2,465
Cash equivalents | Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	330,113	229,047
Cash equivalents | Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Cash equivalents | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Cash equivalents | Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Cash equivalents | Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	67,733	16,961
Cash equivalents | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	15,351	2,465
Investments | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	137,618	108,061
Investments | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	1,407,972	1,229,714
Investments | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	60,380	73,585
Investments | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	91,054	102,214
Investments | Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Investments | Level 1 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Investments | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Investments | Level 1 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Investments | Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	137,618	108,061
Investments | Level 2 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	1,407,972	1,229,714
Investments | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	60,380	73,585
Investments | Level 2 | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 91,054	$ 102,214

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 148,845
Foreign currency translation adjustments	2,339
Goodwill, end of period	$ 151,184

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 171,589	$ 172,225
Less: accumulated amortization	(78,337)	(71,643)
Net carrying amount	93,252	100,582
2019	21,861
2020	19,371
2021	17,336
2022	13,673
2023	7,764
Thereafter	13,247
Total future amortization expense	93,252
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	113,759	114,395
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	57,180	57,180
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 650	$ 650

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 7	$ 5.7

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 725,162			$ 685,829
Less: Accumulated depreciation		(374,511)			(338,613)
Total property and equipment, net	[1]	350,651			347,216
Depreciation		37,100	$ 27,700
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		532,371			493,536
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross		61,270			58,303
Leasehold and other improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		84,429			74,721
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross		43,565			42,551
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross		0			6,551
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 3,527			$ 10,167
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Property and equipment, gross				$ (10,600)
[1]	We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our condensed consolidated financial statements in the year of adoption. See Note 2 for further details.

Derivative Contracts (Details)

Derivative Contracts (Details) - Foreign currency derivative contracts - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 1,200,000	$ 883,900
Level 2 | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	4,216	22,831
Level 2 | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 3,279	$ 2,441

Deferred Revenue and Performa_2

Deferred Revenue and Performance Obligations - Revenues Recognized from Deferred Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred revenue recognized	$ 569.9	$ 479.2

Deferred Revenue and Performa_3

Deferred Revenue and Performance Obligations - Transaction Price Allocated to the Remaining Performance Obligations (Details) $ in Billions	Mar. 31, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Remaining non-cancelable performance obligations	$ 5.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue from Contract with Customer [Abstract]
Performance obligations expected to be satisfied (percent)	50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue from Contract with Customer [Abstract]
Performance obligations expected to be satisfied (percent)	50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]
Accrued payroll		$ 143,431	$ 158,006
Accrued payroll		20,529	35,122
Other employee related liabilities		43,255	60,889
Other		98,946	76,229
Total accrued expenses and other current liabilities	[1]	$ 306,161	$ 330,246
[1]	We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our condensed consolidated financial statements in the year of adoption. See Note 2 for further details.

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019USD ($)daytrading_dayshares	Jun. 30, 2019shares	Dec. 31, 2018USD ($)	Jun. 30, 2017USD ($)shares	Nov. 30, 2013USD ($)shares
Debt Instrument [Line Items]
Percentage of purchase price of notes which should be paid upon fundamental change (percent)	100.00%
Estimated fair value of the note based on the closing trading price | $	$ 100		$ 100
Warrant exercise period | trading_day	60
2018 Warrants
Debt Instrument [Line Items]
Number of shares to be issued upon exercise of the 2018 Warrants | shares	2,700,000				7,783,023
2022 Warrants
Debt Instrument [Line Items]
Number of shares to be issued upon exercise of the 2018 Warrants | shares				5,806,936
Stock Price Trigger Measurement
Debt Instrument [Line Items]
Trading days threshold | day	20
Consecutive trading days threshold, total | day	30
Threshold percentage of stock price trigger (percent)	130.00%
Notes Price Trigger Measurement
Debt Instrument [Line Items]
Trading days threshold | day	5
Consecutive trading days threshold, total | day	5
Threshold percentage of stock price trigger (percent)	98.00%
Conversion of notes base conversion price | $	$ 1,000
2022 Notes
Debt Instrument [Line Items]
Face amount of debt | $	$ 782,500,000		$ 782,500,000	$ 782,500,000
Stated interest rate				0.00%
Remaining discount amortization period	38 months
2018 Notes
Debt Instrument [Line Items]
Face amount of debt | $					$ 575,000,000
Stated interest rate					0.00%
Scenario, Forecast | 2022 Warrants
Debt Instrument [Line Items]
Number of shares to be issued upon exercise of the 2018 Warrants | shares		1,000,000

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of Conversion (Details)	1 Months Ended	2 Months Ended	3 Months Ended
	Nov. 30, 2013shares$ / shares	Jun. 30, 2017$ / shares	Jun. 30, 2017shares$ / shares
2022 Notes
Debt Instrument [Line Items]
Initial Conversion Price per Share (in dollars per share) | $ / shares		$ 134.75	$ 134.75
Initial Conversion Rate per $1,000 Par Value		0.00742
Initial Number of Shares (in shares) | shares			5,806,936
2018 Notes
Debt Instrument [Line Items]
Initial Conversion Price per Share (in dollars per share) | $ / shares	$ 73.88
Initial Conversion Rate per $1,000 Par Value	0.01354
Initial Number of Shares (in shares) | shares	7,783,023

Convertible Senior Notes - Sc_2

Convertible Senior Notes - Schedule of Notes Payable (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2017	Nov. 30, 2013
Debt Instrument [Line Items]
Net carrying amount	$ 669,875,000	$ 661,707,000
2022 Notes
Debt Instrument [Line Items]
Principal	782,500,000	782,500,000	$ 782,500,000
Less: debt issuance cost and debt discount, net of amortization	$ (112,625,000)	$ (120,793,000)
2018 Notes
Debt Instrument [Line Items]
Principal				$ 575,000,000

Convertible Senior Notes - Sc_3

Convertible Senior Notes - Schedule of Equity Components (Details) - 2022 Notes $ in Thousands	Mar. 31, 2019USD ($)
Debt Instrument [Line Items]
Note	$ 162,039
Issuance cost	(2,148)
Net amount recorded in equity	$ 159,891

Convertible Senior Notes - Sc_4

Convertible Senior Notes - Schedule of Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Level 2 | 2022 Notes
Debt Instrument [Line Items]
Estimated fair values of notes	$ 1,444,847	$ 1,105,281

Convertible Senior Notes - Sc_5

Convertible Senior Notes - Schedule of Interest Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Total	$ 8,168	$ 17,064	$ 17,064
2022 Notes
Debt Instrument [Line Items]
Amortization of debt issuance cost	394		376
Amortization of debt discount	$ 7,774		7,402
Effective interest rate of the liability component	4.75%
2018 Notes
Debt Instrument [Line Items]
Amortization of debt issuance cost	$ 0		498
Amortization of debt discount	$ 0		$ 8,788
Effective interest rate of the liability component	6.50%

Convertible Senior Notes - Sc_6

Convertible Senior Notes - Schedule of Note Hedges (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Nov. 30, 2013	Mar. 31, 2019	Jun. 30, 2017
2022 Note Hedge
Derivative [Line Items]
Purchase		$ 128,017
Initial Shares (in shares)			5,806,936
Shares as of March 31, 2019 (in shares)		5,806,936
2018 Note Hedge
Derivative [Line Items]
Purchase		$ 135,815
Initial Shares (in shares)	7,783,023
Shares as of March 31, 2019 (in shares)		0

Convertible Senior Notes - Sc_7

Convertible Senior Notes - Schedule of Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jun. 30, 2017	Nov. 30, 2013
2022 Warrants
Class of Warrant or Right [Line Items]
Proceeds	$ 54,071
Initial Shares (in shares)		5,806,936
Strike Price (in dollars per share)	$ 203.40
Shares as of March 31, 2019	5,806,936
2018 Warrants
Class of Warrant or Right [Line Items]
Proceeds	$ 84,525
Initial Shares (in shares)	2,700,000		7,783,023
Strike Price (in dollars per share)	$ 107.46
Shares as of March 31, 2019	2,853,811

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Foreign currency translation adjustment	$ 9,979	$ 344
Net unrealized gain (loss) on investments, net of tax	344	(4,379)
Accumulated other comprehensive income (loss)	$ 10,323	$ (4,035)

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Nov. 30, 2013
Equity [Abstract]
Shares of common stock, authorized (in shares)	600,000,000
Shares of common stock, issued and sold (in shares)	184,739,169
Stock issued during period, shares, new issues (in shares)	1,882,821	2,287,099
2018 Warrants
Class of Stock [Line Items]
Number of shares to be issued upon exercise of the 2018 Warrants	2,700,000		7,783,023

Stockholders' Equity - Outstand

Stockholders' Equity - Outstanding and Reserved Shares of Common Stock for Future Issuance (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Common stock outstanding and reserved shares of common stock for future issuance
Options outstanding (in shares)	1,579,022	1,810,580
Total shares of common stock reserved for future issuance (in shares)	52,843,076
2012 Equity Incentive Plan
Common stock outstanding and reserved shares of common stock for future issuance
Total shares of common stock reserved for future issuance (in shares)	28,705,526
2012 Employee Stock Purchase Plan
Common stock outstanding and reserved shares of common stock for future issuance
Total shares of common stock reserved for future issuance (in shares)	10,396,547
Options outstanding
Common stock outstanding and reserved shares of common stock for future issuance
Options outstanding (in shares)	1,579,022
RSUs
Common stock outstanding and reserved shares of common stock for future issuance
RSUs (in shares)	12,161,981	10,201,660
Performance-based RSUs
Common stock outstanding and reserved shares of common stock for future issuance
Number of shares eligible to vest (percent)	100.00%

Equity Awards - Additional Info

Equity Awards - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)incentive_planshares	Mar. 31, 2018USD ($)	Dec. 31, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans | incentive_plan	2
Fair value of stock options vested	$ 2
Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options	$ 9.8
Options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period	2 years 1 month 2 days
Restricted stock units with service condition only
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding (in shares) | shares	11,167,127
Restricted stock units with service and performance conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding (in shares) | shares	994,854
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period	3 years 2 months 26 days
Number of shares outstanding (in shares) | shares	12,161,981		10,201,660
Unrecognized compensation expense expected to be recognized	$ 1,500
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares eligible to vest (percent)	100.00%
Stock-based compensation expense, net of actual and estimated forfeitures	$ 22.6	$ 15.6
Performance-based RSUs | Vesting, tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	33.00%
Performance-based RSUs | Vesting, tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	2 years
Performance-based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares eligible to vest (percent)	0.00%
Performance-based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares eligible to vest (percent)	180.00%
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock outstanding, increase, percentage	5.00%
2012 Equity Incentive Plan | Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	4 years
2012 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock outstanding, increase, percentage	1.00%
Common stock purchase price percentage	85.00%
Award offering period	6 months
2005 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted to new employees vest, percentage per annum	25.00%
Requisite service period to vest employment continuation period	3 years
Options granted, exercisable period	10 years

Equity Awards - Summary of Stoc

Equity Awards - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)$ / sharesshares
Number of Shares
Outstanding, beginning balance (in shares) | shares	1,810,580
Exercised (in shares) | shares	(231,558)
Outstanding, ending balance (in shares) | shares	1,579,022
Vested and expected to vest (in shares) | shares	1,574,667
Vested and exercisable (in shares) | shares	1,147,276
Weighted- Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 46.55
Exercised (in dollars per share) | $ / shares	21.69
Outstanding, ending balance (in dollars per share) | $ / shares	50.19
Vested and expected to vest (in dollars per share) | $ / shares	50.13
Vested and exercisable (in dollars per share) | $ / shares	$ 37.62
Weighted-average remaining contractual term, outstanding	5 years 2 months 26 days
Weighted-average remaining contractual term, vested and expected to vest	5 years 2 months 23 days
Weighted-average remaining contractual term, vested and exercisable	4 years 3 months 14 days
Aggregate intrinsic value, exercised | $	$ 46,348
Aggregate intrinsic value, outstanding | $	309,955
Aggregate intrinsic value, vested and expected to vest | $	309,205
Aggregate intrinsic value, vested and exercisable | $	$ 239,629

Equity Awards - Restricted Stoc

Equity Awards - Restricted Stock Unit Table (Details) - Restricted stock units (RSUs) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)$ / sharesshares
Number of Shares
Outstanding, beginning balance (in shares) | shares	10,201,660
Granted (in shares) | shares	4,257,565
Vested (in shares) | shares	(1,939,925)
Forfeited (in shares) | shares	(357,319)
Outstanding, ending balance (in shares) | shares	12,161,981
Weighted Average Grant Date Fair Value (Per Share)
Outstanding, beginning balance (in dollar per share) | $ / shares	$ 121.84
Granted (in dollar per share) | $ / shares	233.78
Vested (in dollar per share) | $ / shares	117.30
Forfeited (in dollar per share) | $ / shares	121.26
Outstanding, ending balance (in dollar per share) | $ / shares	$ 160.28
Aggregate Intrinsic Value (in thousands)
Aggregate intrinsic value, vested | $	$ 445,764
Aggregate intrinsic value, non-vested | $	$ 2,997,807

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income (loss)	$ (1,545)	$ 10,622
Denominator:
Weighted-average shares outstanding - basic (in shares)	182,061,579	175,482,833
Weighted-average shares outstanding - diluted (in shares)	182,061,579	190,249,786
Net income (loss) per share - basic (in dollars per share)	$ (0.01)	$ 0.06
Net income (loss) per share - diluted (in dollars per share)	$ (0.01)	$ 0.06
Common stock options
Denominator:
Weighted-average effect of potentially dilutive securities (in shares)	0	1,995,185
RSUs
Denominator:
Weighted-average effect of potentially dilutive securities (in shares)	0	5,869,792
ESPP obligations
Denominator:
Weighted-average effect of potentially dilutive securities (in shares)	0	7,510
In-the-money portion of Notes | 2018 Notes
Denominator:
Weighted-average effect of potentially dilutive securities (in shares)	0	3,794,221
In-the-money portion of Notes | 2022 Notes
Denominator:
Weighted-average effect of potentially dilutive securities (in shares)	0	736,587
2018 Warrants | Warrants
Denominator:
Weighted-average effect of potentially dilutive securities (in shares)	0	2,363,658

Net Income (Loss) Per Share -_2

Net Income (Loss) Per Share - Schedule of Potentially Dilutive Securities (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	28,420,457	5,845,047
Common stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	1,579,022	0
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	12,161,981	38,114
ESPP obligations
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	211,771	0
Convertible senior notes | 2022 Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	5,806,936	0
Warrants related to the issuance of convertible senior notes | 2018 convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	2,853,811	0
Warrants related to the issuance of convertible senior notes | 2022 convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	5,806,936	5,806,933

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019
Income Taxes [Line Items]
Reasonably possible recognition of income tax benefit (in excess of)	$ 9,911	$ 17,982
Scenario, Forecast
Income Taxes [Line Items]
Reasonably possible recognition of income tax benefit (in excess of)			$ 500,000

Commitments and Contingencies_2

Commitments and Contingencies (Additional Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jun. 30, 2017	Nov. 30, 2013
Debt Instrument [Line Items]
Operating lease costs	$ 14,700,000
Lease expenses recognized prior to adoption of Topic 842		$ 11,400,000
Cash paid for operating lease liability	10,000,000
Operating lease liability from obtaining operating right-of-use assets	$ 67,700,000
Weighted-average lease remaining lease term	10 years 6 months
Weighted-average discount rate	3.90%
Undiscounted cash flows	$ 413,400,000
Unrecognized tax benefits	4,800,000
Letters of credit	21,300,000
2022 Notes
Debt Instrument [Line Items]
Face amount of debt	$ 782,500,000		$ 782,500,000	$ 782,500,000
2018 Notes
Debt Instrument [Line Items]
Face amount of debt					$ 575,000,000
Minimum
Debt Instrument [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	3 years
Maximum
Debt Instrument [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	15 years

Commitments and Contingencies_3

Commitments and Contingencies (Maturity of Operating Lease Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2019	$ 44,266
2020	59,080
2021	57,605
2022	55,098
2023	50,564
Thereafter	259,664
Total operating lease payments	526,277
Less: imputed interest	(103,381)
Present value of operating lease liabilities	$ 422,896
2019		$ 55,435
2020		60,996
2021		63,348
2022		67,707
2023		72,491
Thereafter		578,874
Total		$ 898,851

Information about Geographic _3

Information about Geographic Areas and Products - Geographic Disclosures (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenues by geography
Total revenues		$ 788,926	$ 589,222
Percentage of U.S. revenues in North America		94.00%	95.00%
Property and equipment by geography
Property and equipment, net	[1]	$ 350,651		$ 347,216
Percentage of U.S. net property and equipment in North America		76.00%
North America
Revenues by geography
Total revenues		$ 525,551	$ 387,473
Property and equipment by geography
Property and equipment, net		226,935		227,471
EMEA
Revenues by geography
Total revenues		193,832	152,426
Property and equipment by geography
Property and equipment, net		80,478		82,526
Asia Pacific and other
Revenues by geography
Total revenues		69,543	$ 49,323
Property and equipment by geography
Property and equipment, net		$ 43,238		$ 37,219
[1]	We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our condensed consolidated financial statements in the year of adoption. See Note 2 for further details.

Information about Geographic _4

Information about Geographic Areas and Products - Subscription Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Subscription revenues	$ 788,926	$ 589,222
Digital workflow products
Segment Reporting Information [Line Items]
Subscription revenues	638,657	462,562
ITOM products
Segment Reporting Information [Line Items]
Subscription revenues	101,329	80,763
Total subscription revenues
Segment Reporting Information [Line Items]
Subscription revenues	$ 739,986	$ 543,325

Subsequent Events (Details)

Subsequent Events (Details) - 2018 Warrants - shares	Jun. 30, 2019	Mar. 31, 2019	Nov. 30, 2013
Subsequent Event [Line Items]
Number of shares to be issued upon exercise of the 2018 Warrants		2,700,000	7,783,023
Subsequent Event
Subsequent Event [Line Items]
Number of shares to be issued upon exercise of the 2018 Warrants	1,600,000