ServiceNow (NOW) 10-Q 8 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information shares in Millions	6 Months Ended
	Jun. 30, 2017shares
Document and Entity Information [Abstract]
Entity Registrant Name	SERVICENOW, INC.
Trading Symbol	NOW
Entity Central Index Key	1,373,715
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	170.7

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,173,457	$ 401,238
Short-term investments	518,719	498,124
Accounts receivable, net	279,088	322,757
Current portion of deferred commissions	85,097	76,780
Prepaid expenses and other current assets	54,666	43,636
Total current assets	2,111,027	1,342,535
Deferred commissions, less current portion	67,984	61,990
Long-term investments	319,795	262,658
Property and equipment, net	213,501	181,620
Intangible assets, net	72,587	65,854
Goodwill	104,430	82,534
Other assets	35,082	36,576
Total assets	2,924,406	2,033,767
Current liabilities:
Accounts payable	24,478	38,080
Accrued expenses and other current liabilities	173,508	171,636
Current portion of deferred revenue	1,019,304	861,782
Total current liabilities	1,217,290	1,071,498
Deferred revenue, less current portion	47,491	33,319
Convertible senior notes, net	1,140,063	507,812
Other long-term liabilities	37,136	34,177
Total liabilities	2,441,980	1,646,806
Stockholders’ equity:
Common stock	171	167
Additional paid-in capital	1,577,713	1,405,317
Accumulated other comprehensive loss	(933)	(21,133)
Accumulated deficit	(1,094,525)	(997,390)
Total stockholders’ equity	482,426	386,961
Total liabilities and stockholders’ equity	$ 2,924,406	$ 2,033,767

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Subscription		$ 411,007	$ 290,679	$ 787,142	$ 558,101
Professional services and other		60,696	50,633	101,344	89,090
Total revenues		471,703	341,312	888,486	647,191
Cost of revenues:
Subscription	[1]	75,793	56,360	146,168	109,141
Professional services and other	[1]	45,892	40,289	91,964	81,768
Total cost of revenues	[1]	121,685	96,649	238,132	190,909
Gross profit		350,018	244,663	650,354	456,282
Operating expenses:
Sales and marketing	[1]	247,224	186,506	459,310	345,116
Research and development	[1]	90,005	70,364	174,494	136,288
General and administrative	[1]	51,526	36,071	97,777	77,308
Legal settlements	[1]	0	0	0	270,000
Total operating expenses	[1]	388,755	292,941	731,581	828,712
Loss from operations		(38,737)	(48,278)	(81,227)	(372,430)
Interest expense		(11,337)	(8,248)	(20,015)	(16,357)
Interest income and other income (expense), net		(7,830)	2,260	(114)	2,962
Loss before income taxes		(57,904)	(54,266)	(101,356)	(385,825)
Benefit from income taxes		(1,431)	(4,641)	(4,221)	(2,868)
Net loss		$ (56,473)	$ (49,625)	$ (97,135)	$ (382,957)
Net loss per share - basic and diluted (in USD per share)		$ (0.33)	$ (0.30)	$ (0.57)	$ (2.35)
Weighted-average shares used to compute net loss per share - basic and diluted (in shares)		170,419,083	163,838,755	169,585,356	162,952,721
Other comprehensive income (loss):
Foreign currency translation adjustments		$ 10,221	$ (1,989)	$ 12,093	$ (1,309)
Unrealized gain on investments, net of tax		524	505	8,107	2,138
Other comprehensive income (loss), net of tax		10,745	(1,484)	20,200	829
Comprehensive loss		$ (45,728)	$ (51,109)	$ (76,935)	$ (382,128)
[1]	Includes stock-based compensation as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Cost of revenues: Subscription $ 8,942 $ 6,951 $ 16,880 $ 13,558 Professional services and other 7,617 6,136 14,566 12,895 Sales and marketing 42,287 32,861 80,688 63,859 Research and development 22,731 21,047 44,532 41,580 General and administrative 16,489 11,070 31,343 21,481

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock-based compensation			$ 188,009	$ 153,373
Cost of revenues - subscription
Stock-based compensation	$ 8,942	$ 6,951	16,880	13,558
Cost of revenues - professional services and other
Stock-based compensation	7,617	6,136	14,566	12,895
Sales and marketing
Stock-based compensation	42,287	32,861	80,688	63,859
Research and development
Stock-based compensation	22,731	21,047	44,532	41,580
General and administrative
Stock-based compensation	$ 16,489	$ 11,070	$ 31,343	$ 21,481

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (97,135)	$ (382,957)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	52,407	37,452
Amortization of premiums on investments	1,706	2,799
Amortization of deferred commissions	50,587	36,957
Amortization of debt discount and issuance costs	20,015	16,357
Stock-based compensation	188,009	153,373
Deferred income tax	(4,751)	(6,426)
Other	(3,720)	532
Changes in operating assets and liabilities, net of effect of business combinations:
Accounts receivable	51,039	6,967
Deferred commissions	(61,287)	(48,397)
Prepaid expenses and other assets	(11,945)	(10,001)
Accounts payable	(7,860)	(272)
Deferred revenue	145,662	104,399
Accrued expenses and other liabilities	(6,578)	19,733
Net cash provided by (used in) operating activities	316,149	(69,484)
Cash flows from investing activities:
Purchases of property and equipment	(69,103)	(52,929)
Business combinations, net of cash acquired	(21,537)	(34,297)
Purchases of other intangibles	(6,170)	(10,750)
Purchases of investments	(354,690)	(180,365)
Purchases of strategic investments	(3,900)	0
Sales of investments	77,968	92,885
Maturities of investments	221,949	158,520
Restricted cash	(830)	(611)
Net cash used in investing activities	(156,313)	(27,547)
Cash flows from financing activities:
Net proceeds from borrowings on convertible senior notes	772,127	0
Proceeds from issuance of warrants	54,071	0
Purchases of convertible note hedges	(128,017)	0
Proceeds from employee stock plans	40,892	34,151
Taxes paid related to net share settlement of equity awards	(87,349)	(59,786)
Repurchases of common stock from stockholders	(55,000)	0
Payments on financing obligations	(2,560)	(223)
Net cash provided by (used in) financing activities	594,164	(25,858)
Foreign currency effect on cash and cash equivalents	18,219	(303)
Net increase (decrease) in cash and cash equivalents	772,219	(123,192)
Cash and cash equivalents at beginning of period	401,238	412,305
Cash and cash equivalents at end of period	1,173,457	289,113
Non-cash investing and financing activities:
Property and equipment included in accounts payable and accrued expenses	16,030	14,058
Financing obligation for purchases of other intangibles	$ 2,110	$ 4,100

Description of the Business

Description of the Business	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	Description of the Business

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
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 (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. In the opinion of management, all adjustments (consisting of normal recurring items) considered necessary for fair statement of results for the interim periods presented have been included. The results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of the results to be expected for the year ending December 31, 2017 or for other interim periods or future years. The condensed consolidated balance sheet as of December 31, 2016 is derived from audited financial statements as of that date; 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 the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 , which was filed with the SEC on February 28, 2017. 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. Prior Period Reclassification Certain reclassifications of prior period amounts have been made in our condensed consolidated statements of cash flow and Note 16 to conform to the current period presentation. 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 condensed 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, the best estimate of selling price of the deliverables included in multiple elements revenue arrangements, the fair value of assets acquired and liabilities assumed for business combinations, stock-based compensation expenses, the assessment of the useful life and recoverability of our property and equipment, goodwill and identifiable intangible assets, future taxable income and legal contingencies. Actual results could differ from those estimates. New Accounting Pronouncements Pending Adoption In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2017-09, "Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting," which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, "Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20)—Premium Amortization on Purchased Callable Debt Securities," which shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. This new standard is effective for our interim and annual periods beginning January 1, 2019, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, "Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which eliminates Step 2 from the goodwill impairment test. This standard requires an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. In addition, this new standard eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. This new standard is effective for our interim and annual periods beginning January 1, 2020, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business,” which clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This new standard is required to be applied on a prospective basis, effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. The actual impact upon adoption of this new standard will depend upon the nature of our future acquisitions, if any. In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force)," which requires that amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory," which includes a revision of the accounting for the income tax consequences of intra-entity transfers of assets other than inventory to reduce the complexity in accounting standards. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. The new standard is required to be applied on a modified retrospective basis through a cumulative effect adjustment directly to retained earnings as of the beginning of the period of adoption. While we believe the current impact upon the adoption of this standard on our condensed consolidated financial statements will be immaterial, the actual impact will largely depend on future intra-entity asset transfers, if any. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," which provides guidance on eight specific cash flow issues. Among these issues, this standard requires, at the settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowings, the portion of the cash payment attributable to the accreted interest related to the debt discount to be classified as cash flows for operating activities, and the portion of the cash payments attributable to the principal to be classified as cash outflows for financing activities. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. We currently expect to settle $575.0 million relating to the principal amount of our 0% convertible senior notes due November 1, 2018 in cash upon maturity. At that time, we expect to classify approximately $155.3 million of debt discount attributable to the difference between the 0% coupon interest rate and the 6.5% effective interest rate as an operating cash outflow in our condensed consolidated statements of cash flows. The remaining $419.7 million will be presented as a financing cash outflow in our condensed consolidated statements of cash flows. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments," which requires a financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. Credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. This new standard is effective for our interim and annual periods beginning January 1, 2020. We are currently evaluating the impact of the adoption of this standard on our condensed consolidated financial statements. In February 2016, the FASB issued 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 current practice. This new standard is effective for our interim and annual periods beginning January 1, 2019, and early adoption is permitted. While we are currently evaluating the impact of the adoption of this standard on our condensed consolidated financial statements, we currently anticipate that the adoption this standard will have a material impact on our condensed consolidated balance sheets given that we had operating lease commitments of approximately $364 million as of June 30, 2017 . However, we do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated statements of comprehensive loss since the expense recognition under this new standard will be similar to current practice. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities," which addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, and requires equity securities to be measured at fair value with changes in fair value recognized through net income. This new standard allows a measurement alternative for equity investments that do not have readily determinable fair values to be measured at cost, less any impairment, plus or minus adjustments resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. This new standard is effective for our interim and annual periods beginning January 1, 2018, and will adopted by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, with prospective adoption of the amendments related to equity securities without readily determinable fair values existing as of the date of adoption. While we are currently evaluating the impact of the adoption of this standard on our condensed consolidated financial statements, we preliminarily expect the adoption of this standard to impact our strategic investments and our marketable equity securities, and plan to elect the measurement alternative for equity investments that do not have readily determinable fair values. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)." Under this new standard, revenue is recognized when a customer obtains control of promised goods or services and is recognized in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. In addition, this standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The FASB has recently issued several amendments to the standard, including clarification on accounting for licenses of intellectual property and identifying performance obligations. This new standard is effective for our interim and annual periods beginning January 1, 2018. The Topic 606 guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method) or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). We currently anticipate adopting the standard using the full retrospective method to restate each prior reporting period presented. Given the scope of work required to implement the recognition and disclosure requirements under the Topic 606 standard, we began our assessment process in 2014 and have since made significant progress, including the identification of necessary changes to our policies, processes, systems and controls. We do not expect the Topic 606 standard to have a material impact on the timing of revenue recognition related to our cloud-based subscription offerings. However, we expect this new standard to have a material impact on the timing of revenue and expense recognition for our contracts related to on-premises offerings, in which we grant customers the right to deploy our subscription service on the customer’s own servers, without significant penalty. Under this new standard, the requirement to have vendor specific objective evidence (VSOE) for undelivered elements is eliminated. As such, we may be required to recognize as revenue a portion of the sales price upon delivery of the software, compared to the current practice of recognizing the entire sales price ratably over an estimated subscription period due to the lack of VSOE. To the extent the amounts recognized as revenue have not been billed, the accrued revenue will be recorded as unbilled receivables on our condensed consolidated balance sheets. We currently believe our total revenues reported for the year ended December 31, 2016 would have increased by approximately $14 to $19 million on a pro forma basis if the new standard had been applied for the entire 2016 fiscal year starting on January 1, 2016. In addition, we expect the Topic 606 standard to change the way we account for commissions paid on both our on-premises offerings and our cloud-based subscription offerings. Our current practice is to defer only direct and incremental commission costs to obtain a contract and amortize those costs over the contract term for both our on-premises offerings and our cloud-based subscription offerings. Under this new standard, we will defer all incremental commission costs to obtain customer contracts, including indirect costs that are not tied to a specific contract, for both our on-premises offerings and our cloud-based subscription offerings. Commissions allocated to the software element of our on-premises offerings, which are delivered up front, will be expensed immediately under this new standard, while commissions allocated to the support element of our on-premises offerings as well as commissions paid on our cloud-based subscription offerings, which are delivered over time, will be amortized over an expected period of benefit, which we have determined to be approximately five years . As a result, we currently expect the deferred commissions asset to increase and the related amortization expense in each reporting period to decrease under this new standard. The aggregate impact resulting from changes in the way we account for commission expense for both our cloud-based subscription offerings and our on-premises offerings would have reduced our sales and marketing expenses by approximately $20 to $25 million on a pro forma basis for the year ended December 31, 2016 if the new standard had been applied for the entire 2016 fiscal year starting on January 1, 2016.

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Investments	Investments Marketable Securities The following is a summary of our available-for-sale investment securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): June 30, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 68,075 $ — $ — $ 68,075 Corporate notes and bonds 656,402 123 (878 ) 655,647 Certificates of deposit 36,389 — — 36,389 U.S. government agency securities 56,323 — (134 ) 56,189 Marketable equity securities 10,000 12,214 — 22,214 Total available-for-sale securities $ 827,189 $ 12,337 $ (1,012 ) $ 838,514 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 56,839 $ — $ — $ 56,839 Corporate notes and bonds 628,054 91 (1,590 ) 626,555 Certificates of deposit 35,355 — — 35,355 U.S. government agency securities 42,088 7 (62 ) 42,033 Total available-for-sale securities $ 762,336 $ 98 $ (1,652 ) $ 760,782 As of June 30, 2017 , the contractual maturities of our available-for-sale investment securities, excluding marketable equity securities, did not exceed 24 months . The fair values of these securities, by remaining contractual maturity, are as follows (in thousands): June 30, 2017 Due in 1 year or less $ 496,505 Due in 1 to 2 years 319,795 Total $ 816,300 The following table shows the fair values and the gross unrealized losses of our available-for-sale investment securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types (in thousands): June 30, 2017 Less than 12 Months 12 Months or Greater Total Fair Value Gross Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate notes and bonds $ 511,868 $ (877 ) $ 3,775 $ (1 ) $ 515,643 $ (878 ) U.S. government agency securities 65,175 (134 ) — — 65,175 (134 ) Total $ 577,043 $ (1,011 ) $ 3,775 $ (1 ) $ 580,818 $ (1,012 ) December 31, 2016 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 $ 492,503 $ (1,530 ) $ 47,940 $ (60 ) $ 540,443 $ (1,590 ) U.S. government agency securities 30,033 (62 ) — — 30,033 (62 ) Total $ 522,536 $ (1,592 ) $ 47,940 $ (60 ) $ 570,476 $ (1,652 ) 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. Strategic Investments Our strategic investments consist of debt and non-marketable equity investments in privately-held companies. Debt investments in privately-held companies are classified as available-for-sale and are recorded at their estimated fair value with changes in fair value recorded through accumulated other comprehensive income, while non-marketable equity securities are recorded at cost. We have not recorded any impairment charges for any of our investments in privately-held companies. The total amount of debt and equity investments in privately-held companies included in Other assets on the condensed consolidated balance sheets was $4.9 million and $11.0 million as of June 30, 2017 and December 31, 2016 , respectively. During the six months ended June 30, 2017 , we reclassified $10.0 million of non-marketable equity securities (at cost) to Short-term investments on our condensed consolidated balance sheets due to an initial public offering by the investee, and recorded an unrealized gain of $12.2 million within other comprehensive income in our consolidated statements of comprehensive loss. During the six months ended June 30, 2017 , we also acquired an additional $3.9 million in strategic investments. The fair value of our debt investments in privately-held companies included within our strategic investments is $1.4 million and $0.5 million as of June 30, 2017 and December 31, 2016

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [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 at June 30, 2017 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 217,219 $ — $ 217,219 Certificates of deposit — 1,000 1,000 U.S. government agency securities — 607,548 607,548 Short-term investments: Commercial paper — 68,075 68,075 Corporate notes and bonds — 387,571 387,571 Certificates of deposit — 17,505 17,505 U.S. government agency securities — 23,354 23,354 Marketable equity securities 22,214 — 22,214 Long-term investments: Corporate notes and bonds — 268,076 268,076 Certificates of deposit — 18,884 18,884 U.S. government agency securities — 32,835 32,835 Total $ 239,433 $ 1,424,848 $ 1,664,281 The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis at December 31, 2016 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 165,627 $ — $ 165,627 Short-term investments: Commercial paper — 56,839 56,839 Corporate notes and bonds — 388,429 388,429 Certificates of deposit — 35,355 35,355 U.S. government agency securities — 17,501 17,501 Long-term investments: Corporate notes and bonds — 238,125 238,125 U.S. government agency securities — 24,533 24,533 Total $ 165,627 $ 760,782 $ 926,409 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.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Business Combinations	Business Combinations 2017 Business Combinations DxContinuum On January 20, 2017, we completed the acquisition of a privately-held company, DxContinuum, Inc. (DxContinuum), by acquiring all issued and outstanding common shares of DxContinuum for approximately $15.0 million in an all-cash transaction to enhance the predictive capabilities of our solutions. The following table summarizes the allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date: Purchase Price Allocation (in thousands) Useful Life (in years) Net tangible assets acquired $ 37 Intangible assets: Developed technology 6,400 5 Goodwill 11,159 Net deferred tax liabilities (1) (2,561 ) Total purchase price $ 15,035 (1) Deferred tax liabilities, net primarily relates to purchased identifiable intangible assets and is shown net of deferred tax assets. The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. We believe the goodwill represents the synergies expected from expanded market opportunities when integrating DxContinuum technologies with our offerings. The goodwill balance is not deductible for income tax purposes. Other 2017 Business Combination On May 19, 2017, we completed the acquisition of a privately-held company, Qlue, Inc., for approximately $6.6 million in cash, and have included the results of operations of this company in our condensed consolidated financial statements from the date of purchase. In allocating the purchase price based on the estimated fair value, we recorded $5.0 million of goodwill, $2.6 million of developed technology intangible assets (to be amortized over an estimated useful life of 5 years), and $1.1 million of deferred tax liabilities. Amounts allocated to the remaining acquired tangible assets and assumed liabilities were not material. The goodwill balance associated with this business combination is not deductible for income tax purposes. The results of operations of both of our 2017 business combinations have been included in our condensed consolidated financial statements from their respective dates of purchase. These business combinations did not have a material impact on our condensed consolidated financial statements, and therefore historical and pro forma disclosures have not been presented. Aggregate acquisition-related costs of $1.4 million for the six months ended June 30, 2017 are included in general and administrative expenses in our condensed consolidated statements of comprehensive loss. 2016 Business Combinations BrightPoint Security On June 3, 2016, we completed the acquisition of a privately-held company, BrightPoint Security, Inc. (BrightPoint), by acquiring all issued and outstanding common shares of BrightPoint for approximately $19.6 million in an all-cash transaction to expand our Security Operations solutions. The following table summarizes the allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date: Purchase Price Allocation (in thousands) Useful Life (in years) Intangible assets: Developed technology $ 8,100 6 Customer contracts and related relationships 500 1.5 Goodwill 15,258 Net tangible liabilities acquired (1,339 ) Net deferred tax liabilities (1) (2,890 ) Total purchase price $ 19,629 (1) Deferred tax liabilities, net primarily relates to purchased identifiable intangible assets and is shown net of deferred tax assets. ITapp On April 8, 2016, we completed the acquisition of a privately-held company, ITapp Inc. (ITapp), by acquiring all issued and outstanding common shares of ITapp for approximately $14.5 million in an all-cash transaction to expand our IT Operations Management solutions. The following table summarizes the allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date: Purchase Price Allocation (in thousands) Useful Life (in years) Net tangible assets acquired $ 140 Intangible assets: Developed technology 4,700 5 Customer contracts and related relationships 200 1.5 Goodwill 11,437 Net deferred tax liabilities (1) (2,015 ) Total purchase price $ 14,462 (1) Deferred tax liabilities, net primarily relates to purchased identifiable intangible assets and is shown net of deferred tax assets. For both of the 2016 business combinations, the excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. We believe the goodwill represents the synergies expected from expanded market opportunities when integrating the acquired technologies with our offerings. The goodwill balance for both business combinations is not deductible for income tax purposes. Aggregate acquisition-related costs of $1.0 million are included in general and administrative expenses in our condensed consolidated statements of comprehensive loss. The results of operations of both BrightPoint and ITapp have been included in our condensed consolidated financial statements from their respective dates of purchase. The following pro forma consolidated financial information combines the results of operations from us, BrightPoint and ITapp for the three and six months ended June 30, 2016 , as if the acquisitions of BrightPoint and ITapp had occurred on January 1, 2016 (in thousands, except share and per share data): Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 Revenues $ 341,631 $ 647,898 Net loss $ (50,674 ) $ (386,299 ) Weighted-average shares used to compute net loss per share - basic and diluted 163,838,755 162,952,721 Net loss per share - basic and diluted $ (0.31 ) $ (2.37 )

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2017
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, 2016 $ 82,534 Goodwill acquired 16,159 Foreign currency translation adjustments 5,737 Balance as of June 30, 2017 $ 104,430 Intangible assets consist of the following (in thousands): June 30, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 90,033 $ (39,782 ) $ 50,251 Patents 23,780 (1,874 ) 21,906 Other 1,775 (1,345 ) 430 Total intangible assets $ 115,588 $ (43,001 ) $ 72,587 During the six months ended June 30, 2017 , we acquired patents with a weighted average useful life of 10 years for an aggregate purchase price of $6.2 million . December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 79,206 $ (30,858 ) $ 48,348 Patents 17,610 (867 ) 16,743 Other 1,775 (1,012 ) 763 Total intangible assets $ 98,591 $ (32,737 ) $ 65,854 Amortization expense for intangible assets for the three months ended June 30, 2017 and 2016 was approximately $4.8 million and $3.7 million , respectively, and for the six months ended June 30, 2017 and 2016 was approximately $9.5 million and $6.6 million , respectively. The following table presents the estimated future amortization expense related to intangible assets held at June 30, 2017 (in thousands): Years Ending December 31, 2017 $ 9,502 2018 18,491 2019 18,410 2020 8,585 2021 6,665 Thereafter 10,934 Total future amortization expense $ 72,587

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment, net consists of the following (in thousands): June 30, December 31, 2017 2016 Computer equipment $ 272,883 $ 222,648 Computer software 39,781 32,132 Leasehold improvements 39,836 37,095 Furniture and fixtures 34,746 31,574 Building 7,063 6,379 Construction in progress 7,731 2,535 402,040 332,363 Less: Accumulated depreciation (188,539 ) (150,743 ) Total property and equipment, net $ 213,501 $ 181,620 Construction in progress consists primarily of leasehold improvements and in-process software development costs. Depreciation expense for the three months ended June 30, 2017 and 2016 was $22.2 million and $16.3 million , respectively, and for the six months ended June 30, 2017 and 2016 was approximately $42.6 million and $30.8 million

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	6 Months Ended
	Jun. 30, 2017
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): June 30, December 31, 2017 2016 Taxes payable $ 16,752 $ 19,472 Bonuses and commissions 54,465 67,259 Accrued compensation 34,760 30,816 Other employee related liabilities 31,926 28,812 Other 35,605 25,277 Total accrued expenses and other current liabilities $ 173,508 $ 171,636

Convertible Senior Notes

Convertible Senior Notes	6 Months Ended
	Jun. 30, 2017
Convertible Notes Payable [Abstract]
Convertible Senior Notes	Convertible Senior Notes During the three months ended June 30, 2017 , we issued $782.5 million of 0% convertible senior notes (the 2022 Notes), due June 1, 2022 unless earlier converted or repurchased in accordance with their terms. In November 2013 , we issued $575.0 million of 0% convertible senior notes (the 2018 Notes, and together with the 2022 Notes, the Notes), due November 1, 2018 unless earlier converted or repurchased in accordance with their terms. The Notes do not bear interest, and we cannot redeem the Notes prior to maturity. The 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 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. We intend to settle the principal amount of the 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 Holders of the Notes may convert their Notes at their option at any time prior to the close of business on the business day immediately preceding February 1, 2022 and July 1, 2018 , for the 2022 Notes and 2018 Notes, respectively (each, a Convertible Date), only under the following circumstances: • during any calendar quarter (and only during such calendar quarter) if the last reported sale price of the 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; • 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. On or after the applicable 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. Upon conversion, 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. As noted above, we currently intend to settle the principal amount of the Notes with cash. The conversion price will be subject to adjustment in some events. Holders of the Notes who convert their 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 Notes may require us to purchase with cash all or a portion of the Notes upon the occurrence of a fundamental change, at a purchase price equal to 100% of the principal amount of the respective Notes plus any accrued and unpaid interest. In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying cost of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes. The difference between the principal amount of the Notes and the proceeds allocated to the liability component, or the debt discount, is amortized to interest expense using the effective interest method over the term of the respective Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components based on their relative fair values. Transaction costs attributable to the liability component are being amortized to interest expense over the respective terms of the Notes, and transaction costs attributable to the equity component were netted with the equity component of the Notes in stockholders’ equity. The Notes consisted of the following (in thousands): June 30, 2017 December 31, 2016 Liability component: Principal: 2022 Notes $ 782,500 $ — 2018 Notes 575,000 575,000 Less: debt issuance cost and debt discount, net of amortization 2022 Notes (167,754 ) $ — 2018 Notes (49,683 ) (67,188 ) Net carrying amount $ 1,140,063 $ 507,812 2022 Notes 2018 Notes Equity component recorded at issuance: Note 162,039 155,319 Issuance cost (2,148 ) (3,257 ) Net amount recorded in equity 159,891 152,062 The price of our common stock was greater than or equal to 130% of the conversion price of the 2018 Notes for at least 20 trading days during the 30 consecutive trading days ending on the last trading day of the quarter ended June 30, 2017 . Therefore, as of June 30, 2017 , the 2018 Notes became convertible at the holders’ option beginning on July 1, 2017 and ending September 30, 2017. As we have the option to settle the principal amount in shares and we are more than 12 months away from the maturity date, we continue to classify the net carrying amount of our 2018 Notes as a long-term liability and the equity component of our 2018 Notes continues to remain in permanent equity. Our 2018 Notes were not convertible as of December 31, 2016. Our 2022 Notes were not convertible as of June 30, 2017 . We consider the fair value of the Notes at June 30, 2017 to be a Level 2 measurement. The estimated fair values of the Notes at June 30, 2017 and December 31, 2016 based on the closing trading price per $100 of the Notes were as follows (in thousands): June 30, 2017 December 31, 2016 2022 Notes $ 796,976 N/A 2018 Notes $ 833,808 $ 681,375 As of June 30, 2017 , the remaining life of the 2022 Notes and 2018 Notes are 59 months and 16 months, respectively. The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Amortization of debt issuance cost 2022 Notes $ 122 $ — $ 122 $ — 2018 Notes 474 442 940 877 Amortization of debt discount 2022 Notes 2,388 — 2,388 — 2018 Notes 8,353 7,806 16,565 15,480 Total $ 11,337 $ 8,248 $ 20,015 $ 16,357 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. Purchase Shares (in thousands) 2022 Note Hedge $ 128,017 5,806,936 2018 Note Hedge $ 135,815 7,783,023 The Note Hedges cover shares of our common stock at a strike price per share that corresponds to the initial conversion price of the respective Notes, subject to adjustment, and are exercisable upon conversion of the Notes. We have accounted for the aggregate amount of purchase price for the Notes as a reduction to additional paid-in capital. The Note Hedges will expire upon the maturity of the Notes. The Note Hedges are intended to reduce the potential economic dilution upon conversion of the 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 Notes. The Note Hedges are separate transactions and are not part of the terms of the Notes. Holders of the Notes will not have any rights with respect to the Note Hedges. The Note Hedges do not impact earnings per share, as they were entered into to offset any dilution from the Notes. Warrants Proceeds Shares Strike Price (in thousands) 2022 Warrants $ 54,071 5,806,936 $ 203.40 2018 Warrants $ 84,525 7,783,023 $ 107.46

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss, net of tax, consist of the following (in thousands): June 30, December 31, 2017 2016 Foreign currency translation adjustment $ (7,184 ) $ (19,277 ) Net unrealized gain (loss) on investments, net of tax 6,251 (1,856 ) Accumulated other comprehensive loss $ (933 ) $ (21,133 )

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock We were authorized to issue 600,000,000 shares of common stock as of June 30, 2017 . Holders of our common stock are not entitled to receive dividends unless declared by our board of directors. As of June 30, 2017 , we had 170,712,093 shares of common stock outstanding and had reserved shares of common stock for future issuance as follows: June 30, 2017 Stock plans: Options outstanding 4,992,394 RSUs 13,270,087 Shares of common stock available for future grants: 2012 Equity Incentive Plan (1) 25,602,145 2012 Employee Stock Purchase Plan (1) 9,868,010 Total reserved shares of common stock for future issuance 53,732,636 (1) Refer to Note 12 for a description of these plans. During the six months ended June 30, 2017 and 2016 , we issued a total of 3,822,126 shares and 3,710,925 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). In May 2017, we repurchased and retired 540,806 shares of our common stock for approximately $55.0 million , or $101.70 per share. We had no similar repurchases or retirements of common stock during the six months ended June 30, 2016

Equity Awards

Equity Awards	6 Months Ended
	Jun. 30, 2017
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. The share reserve also automatically increases on January 1 of each year until January 1, 2022, by up to 5% of the total number of shares of common stock outstanding on December 31 of the preceding year as determined by the board of directors. On January 1, 2017 , 8,371,539 shares of common stock were automatically added to the 2012 Plan pursuant to the provision described in the preceding sentence. 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 the 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 the board of directors. On January 1, 2017 , 1,674,308 shares of common stock were automatically added to the 2012 ESPP pursuant to the provision described in the preceding sentence. Stock Options A summary of the stock option activity for the six months ended June 30, 2017 is as follows: Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2016 5,818,435 $ 20.57 Granted 566,720 84.81 Exercised (697,446 ) 15.77 $ 51,560 Canceled (38,334 ) 71.68 Outstanding at March 31, 2017 5,649,375 $ 27.26 Granted 50,000 103.60 Exercised (705,807 ) 8.62 $ 62,617 Canceled (1,174 ) 57.78 Outstanding at June 30, 2017 4,992,394 $ 30.65 5.57 $ 376,150 Vested and expected to vest as of June 30, 2017 4,919,086 $ 29.99 5.52 $ 373,914 Vested and exercisable as of June 30, 2017 3,772,067 $ 15.16 4.42 $ 342,656 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 weighted-average grant date fair value per share of options granted was $37.57 for the six months ended June 30, 2017 . The total fair value of stock options vested during the six months ended June 30, 2017 was $5.3 million . Included in the number of options granted during the six months ended June 30, 2017 are 396,720 options with both service and market-based criteria, which were granted to our new President and Chief Executive Officer, who started his employment with us during the second quarter. The fair values of the options granted and the corresponding derived service periods were calculated using a Monte Carlo simulation, which estimates the potential outcome of reaching the market condition based on simulated future stock prices. The stock-based compensation expense associated with these options are recorded on a graded vesting basis. As of June 30, 2017 , total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options was approximately $33.8 million . The weighted-average remaining vesting period of unvested stock options at June 30, 2017 was 3.55 years . RSUs A summary of RSU activity for the six months ended June 30, 2017 is as follows: Number of Shares Weighted Average Grant Date Fair Value (Per Share) Aggregate Intrinsic Value (in thousands) Non-vested at December 31, 2016 12,222,282 $ 63.66 Granted 4,216,410 88.05 Vested (1,801,659 ) 55.73 $ 164,367 Forfeited (507,680 ) 73.14 Non-vested at March 31, 2017 14,129,353 71.60 Granted 763,940 97.79 Vested (1,177,903 ) 63.84 $ 115,487 Forfeited (445,303 ) 68.78 Non-vested at June 30, 2017 13,270,087 $ 73.89 $ 1,406,629 RSUs granted to employees under the 2012 Plan generally vest over a four -year period. As of June 30, 2017 , total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested RSUs was approximately $737.9 million and the weighted-average remaining vesting period was 2.91 years

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share Basic net loss per share attributable to common stockholders is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing net 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 common stock options, RSUs, ESPP obligations, convertible senior notes and warrants. 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 common stock options, RSUs, ESPP obligations, convertible senior notes and warrants are excluded from the computation of diluted net loss per share in periods in which the effect would be antidilutive. The following table presents the calculation of basic and diluted net loss per share (in thousands, except share and per share data): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator: Net loss $ (56,473 ) $ (49,625 ) $ (97,135 ) $ (382,957 ) Denominator: Weighted-average shares outstanding—basic and diluted 170,419,083 163,838,755 169,585,356 162,952,721 Net loss per share—basic and diluted: $ (0.33 ) $ (0.30 ) $ (0.57 ) $ (2.35 ) Potentially dilutive securities that are not included in the calculation of diluted net loss per share because doing so would be antidilutive are as follows: June 30, 2017 2016 Common stock options 4,992,394 6,902,902 Restricted stock units 13,270,087 13,274,438 ESPP obligations 286,176 288,467 2018 convertible senior notes 7,783,023 7,783,023 Warrants related to the issuance of 2018 convertible senior notes 7,783,023 7,783,023 2022 convertible senior notes 5,806,936 — Warrants related to the issuance of 2022 convertible senior notes 5,806,936 — Total potentially dilutive securities 45,728,575 36,031,853

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
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 effective tax rate was 2% and 4% for the three and six months ended June 30, 2017 , which was lower than the U.S. federal statutory tax rate of 34% . The lower tax rate was primarily attributable to our loss from operations, the foreign tax rate differential, a release of the valuation allowance in connection with acquisitions, excess tax benefits of stock-based compensation and the tax effects of unrealized gains in investment securities. Our effective tax rate was 9% and 1% for the three and six months ended June 30, 2016 , which was lower than the U.S. federal statutory tax rate of 34% . The lower tax rate was primarily attributable to our loss from operations, the foreign tax rate differential, a release of the valuation allowance in connection with acquisitions and excess tax benefits of stock-based compensation. We are subject to taxation in the United States and foreign jurisdictions. As of June 30, 2017 , our tax years 2005 to 2016 remain subject to examination in most jurisdictions.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases and Other Contractual Commitments For some of our offices and data centers, we have entered into non-cancelable operating lease agreements with various expiration dates. Future minimum payments under our non-cancelable operating leases and other contractual commitments outstanding as of June 30, 2017 are presented in the table below (in thousands): Leases, net of Sublease Income Purchase Obligations (1) Other Total Years Ending December 31, Remainder of 2017 $ 19,368 $ 12,879 $ 286 $ 32,533 2018 43,166 19,093 572 62,831 2019 45,418 10,614 572 56,604 2020 45,119 5,155 572 50,846 2021 43,637 3,172 572 47,381 Thereafter 167,473 162 1,621 169,256 Total $ 364,181 $ 51,075 $ 4,195 $ 419,451 (1) Consists of future minimum payments under non-cancelable purchase commitments primarily related to data center and IT operations and sales and marketing activities. Not included in the table above are certain purchase commitments related to our future annual Knowledge user conferences and other customer or sales conferences. If we were to cancel these contractual commitments as of June 30, 2017 , we would have been obligated to pay cancellation penalties of approximately $16.2 million in aggregate, of which $7.8 million is related to our Knowledge user conference in May 2018. 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, and the repayment of our 2018 Notes with an aggregate principal amount of $575.0 million is due on November 1, 2018. Refer to Note 9 for further information regarding our Notes. 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. On February 6, 2014, Hewlett-Packard Company (Hewlett-Packard) filed a lawsuit against us in the U.S. District Court for the Northern District of California. The lawsuit alleged patent infringement and sought damages and an injunction. On or about November 1, 2015, Hewlett Packard Enterprise Company (HPE) separated from Hewlett-Packard as an independent company, Hewlett-Packard assigned to HPE all right, title, and interest in the eight Hewlett-Packard patents in the lawsuit, and HPE was substituted as plaintiff in the litigation. On March 4, 2016, we entered into a confidential settlement agreement resolving the lawsuit with HPE (HPE Settlement). As a result, on March 9, 2016, the lawsuit was dismissed. BMC Software, Inc. (BMC) filed lawsuits against us in the U.S. District Court for the Eastern District of Texas on September 23, 2014 and February 12, 2016, and in the Dusseldorf (Germany) Regional Court, Patent Division, on March 2, 2016. Each of the lawsuits alleged patent infringement and sought damages and an injunction. On April 8, 2016, we entered into a confidential settlement agreement resolving all the lawsuits with BMC (BMC Settlement). As a result, the second Texas lawsuit was dismissed on April 14, 2016, and each of the initial Texas lawsuit and the German lawsuit was dismissed on April 25, 2016. These settlements are considered multiple element arrangements for accounting purposes. We evaluated the accounting treatment of these settlements by identifying each element of the arrangements, which included amongst other elements, a release of past infringement claims and a covenant not to sue for a specified term of years. The primary benefit we received from the arrangements was the settlement and termination of all existing litigation, the avoidance of future litigation expenses and the avoidance of future management and customer disruptions. We determined that none of the elements of the settlement agreements have identifiable future benefits that would be capitalized as an asset. Accordingly, we recorded charges for aggregate legal settlements of $270.0 million in our condensed consolidated statement of comprehensive loss during the six months ended June 30, 2016

Information about Geographic Ar

Information about Geographic Areas and Products	6 Months Ended
	Jun. 30, 2017
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 June 30, Six Months Ended June 30, 2017 2016 2017 2016 North America (1) $ 322,263 $ 234,009 $ 607,844 $ 444,526 EMEA (2) 113,670 82,065 212,536 156,346 Asia Pacific and other 35,770 25,238 68,106 46,319 Total revenues $ 471,703 $ 341,312 $ 888,486 $ 647,191 Property and equipment, net by geographic area were as follows (in thousands): June 30, December 31, 2017 2016 North America (3) $ 150,604 $ 132,671 EMEA (2) 46,370 37,449 Asia Pacific and other 16,527 11,500 Total property and equipment, net $ 213,501 $ 181,620 (1) Revenues attributed to the United States were approximately 95% of North America revenues for each of the three months ended June 30, 2017 and 2016 , and each of the six months ended June 30, 2017 and 2016 . (2) Europe, the Middle East and Africa (3) Property and equipment, net attributed to the United States were approximately 90% and 92% of property and equipment, net attributable to North America as of June 30, 2017 and December 31, 2016 , respectively. Subscription revenues consist of the following (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Service Management solutions $ 363,746 $ 264,667 $ 697,382 $ 509,273 IT Operations Management solutions 47,261 26,012 89,760 48,828 Total subscription revenues $ 411,007 $ 290,679 $ 787,142 $ 558,101

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
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 (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. In the opinion of management, all adjustments (consisting of normal recurring items) considered necessary for fair statement of results for the interim periods presented have been included. The results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of the results to be expected for the year ending December 31, 2017 or for other interim periods or future years. The condensed consolidated balance sheet as of December 31, 2016 is derived from audited financial statements as of that date; 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 the Company’s Annual Report on Form 10-K for the year ended December 31, 2016
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.
Prior Period Reclassification	Certain reclassifications of prior period amounts have been made in our condensed consolidated statements of cash flow and Note 16 to conform to the current period presentation
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 condensed 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, the best estimate of selling price of the deliverables included in multiple elements revenue arrangements, the fair value of assets acquired and liabilities assumed for business combinations, stock-based compensation expenses, the assessment of the useful life and recoverability of our property and equipment, goodwill and identifiable intangible assets, future taxable income and legal contingencies. Actual results could differ from those estimates.
New Accounting Pronouncements Pending Adoption	In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2017-09, "Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting," which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, "Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20)—Premium Amortization on Purchased Callable Debt Securities," which shortens the amortization period for certain callable debt securities held at a premium to require such premiums to be amortized to the earliest call date unless applicable guidance related to certain pools of securities is applied to consider estimated prepayments. This new standard is effective for our interim and annual periods beginning January 1, 2019, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, "Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which eliminates Step 2 from the goodwill impairment test. This standard requires an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. In addition, this new standard eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. This new standard is effective for our interim and annual periods beginning January 1, 2020, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business,” which clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This new standard is required to be applied on a prospective basis, effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. The actual impact upon adoption of this new standard will depend upon the nature of our future acquisitions, if any. In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force)," which requires that amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. We do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory," which includes a revision of the accounting for the income tax consequences of intra-entity transfers of assets other than inventory to reduce the complexity in accounting standards. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. The new standard is required to be applied on a modified retrospective basis through a cumulative effect adjustment directly to retained earnings as of the beginning of the period of adoption. While we believe the current impact upon the adoption of this standard on our condensed consolidated financial statements will be immaterial, the actual impact will largely depend on future intra-entity asset transfers, if any. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," which provides guidance on eight specific cash flow issues. Among these issues, this standard requires, at the settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowings, the portion of the cash payment attributable to the accreted interest related to the debt discount to be classified as cash flows for operating activities, and the portion of the cash payments attributable to the principal to be classified as cash outflows for financing activities. This new standard is effective for our interim and annual periods beginning January 1, 2018, and early adoption is permitted. We currently expect to settle $575.0 million relating to the principal amount of our 0% convertible senior notes due November 1, 2018 in cash upon maturity. At that time, we expect to classify approximately $155.3 million of debt discount attributable to the difference between the 0% coupon interest rate and the 6.5% effective interest rate as an operating cash outflow in our condensed consolidated statements of cash flows. The remaining $419.7 million will be presented as a financing cash outflow in our condensed consolidated statements of cash flows. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments," which requires a financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. Credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. This new standard is effective for our interim and annual periods beginning January 1, 2020. We are currently evaluating the impact of the adoption of this standard on our condensed consolidated financial statements. In February 2016, the FASB issued 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 current practice. This new standard is effective for our interim and annual periods beginning January 1, 2019, and early adoption is permitted. While we are currently evaluating the impact of the adoption of this standard on our condensed consolidated financial statements, we currently anticipate that the adoption this standard will have a material impact on our condensed consolidated balance sheets given that we had operating lease commitments of approximately $364 million as of June 30, 2017 . However, we do not anticipate that the adoption of this standard will have a material impact on our condensed consolidated statements of comprehensive loss since the expense recognition under this new standard will be similar to current practice. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities," which addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, and requires equity securities to be measured at fair value with changes in fair value recognized through net income. This new standard allows a measurement alternative for equity investments that do not have readily determinable fair values to be measured at cost, less any impairment, plus or minus adjustments resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. This new standard is effective for our interim and annual periods beginning January 1, 2018, and will adopted by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, with prospective adoption of the amendments related to equity securities without readily determinable fair values existing as of the date of adoption. While we are currently evaluating the impact of the adoption of this standard on our condensed consolidated financial statements, we preliminarily expect the adoption of this standard to impact our strategic investments and our marketable equity securities, and plan to elect the measurement alternative for equity investments that do not have readily determinable fair values. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)." Under this new standard, revenue is recognized when a customer obtains control of promised goods or services and is recognized in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. In addition, this standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The FASB has recently issued several amendments to the standard, including clarification on accounting for licenses of intellectual property and identifying performance obligations. This new standard is effective for our interim and annual periods beginning January 1, 2018. The Topic 606 guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method) or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). We currently anticipate adopting the standard using the full retrospective method to restate each prior reporting period presented. Given the scope of work required to implement the recognition and disclosure requirements under the Topic 606 standard, we began our assessment process in 2014 and have since made significant progress, including the identification of necessary changes to our policies, processes, systems and controls. We do not expect the Topic 606 standard to have a material impact on the timing of revenue recognition related to our cloud-based subscription offerings. However, we expect this new standard to have a material impact on the timing of revenue and expense recognition for our contracts related to on-premises offerings, in which we grant customers the right to deploy our subscription service on the customer’s own servers, without significant penalty. Under this new standard, the requirement to have vendor specific objective evidence (VSOE) for undelivered elements is eliminated. As such, we may be required to recognize as revenue a portion of the sales price upon delivery of the software, compared to the current practice of recognizing the entire sales price ratably over an estimated subscription period due to the lack of VSOE. To the extent the amounts recognized as revenue have not been billed, the accrued revenue will be recorded as unbilled receivables on our condensed consolidated balance sheets. We currently believe our total revenues reported for the year ended December 31, 2016 would have increased by approximately $14 to $19 million on a pro forma basis if the new standard had been applied for the entire 2016 fiscal year starting on January 1, 2016. In addition, we expect the Topic 606 standard to change the way we account for commissions paid on both our on-premises offerings and our cloud-based subscription offerings. Our current practice is to defer only direct and incremental commission costs to obtain a contract and amortize those costs over the contract term for both our on-premises offerings and our cloud-based subscription offerings. Under this new standard, we will defer all incremental commission costs to obtain customer contracts, including indirect costs that are not tied to a specific contract, for both our on-premises offerings and our cloud-based subscription offerings. Commissions allocated to the software element of our on-premises offerings, which are delivered up front, will be expensed immediately under this new standard, while commissions allocated to the support element of our on-premises offerings as well as commissions paid on our cloud-based subscription offerings, which are delivered over time, will be amortized over an expected period of benefit, which we have determined to be approximately five years . As a result, we currently expect the deferred commissions asset to increase and the related amortization expense in each reporting period to decrease under this new standard. The aggregate impact resulting from changes in the way we account for commission expense for both our cloud-based subscription offerings and our on-premises offerings would have reduced our sales and marketing expenses by approximately $20 to $25 million on a pro forma basis for the year ended December 31, 2016 if the new standard had been applied for the entire 2016 fiscal year starting on January 1, 2016.
Strategic Investments	Our strategic investments consist of debt and non-marketable equity investments in privately-held companies. Debt investments in privately-held companies are classified as available-for-sale and are recorded at their estimated fair value with changes in fair value recorded through accumulated other comprehensive income, while non-marketable equity securities are recorded at cost.
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.
Net Loss Per Share	Basic net loss per share attributable to common stockholders is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing net 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 common stock options, RSUs, ESPP obligations, convertible senior notes and warrants. 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 common stock options, RSUs, ESPP obligations, convertible senior notes and warrants are excluded from the computation of diluted net loss per share in periods in which the effect would be antidilutive.
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)	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Summary of Investments	The following is a summary of our available-for-sale investment securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): June 30, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 68,075 $ — $ — $ 68,075 Corporate notes and bonds 656,402 123 (878 ) 655,647 Certificates of deposit 36,389 — — 36,389 U.S. government agency securities 56,323 — (134 ) 56,189 Marketable equity securities 10,000 12,214 — 22,214 Total available-for-sale securities $ 827,189 $ 12,337 $ (1,012 ) $ 838,514 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Commercial paper $ 56,839 $ — $ — $ 56,839 Corporate notes and bonds 628,054 91 (1,590 ) 626,555 Certificates of deposit 35,355 — — 35,355 U.S. government agency securities 42,088 7 (62 ) 42,033 Total available-for-sale securities $ 762,336 $ 98 $ (1,652 ) $ 760,782
Investments Classified by Contractual Maturity Date	The fair values of these securities, by remaining contractual maturity, are as follows (in thousands): June 30, 2017 Due in 1 year or less $ 496,505 Due in 1 to 2 years 319,795 Total $ 816,300
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 our available-for-sale investment securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types (in thousands): June 30, 2017 Less than 12 Months 12 Months or Greater Total Fair Value Gross Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Corporate notes and bonds $ 511,868 $ (877 ) $ 3,775 $ (1 ) $ 515,643 $ (878 ) U.S. government agency securities 65,175 (134 ) — — 65,175 (134 ) Total $ 577,043 $ (1,011 ) $ 3,775 $ (1 ) $ 580,818 $ (1,012 ) December 31, 2016 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 $ 492,503 $ (1,530 ) $ 47,940 $ (60 ) $ 540,443 $ (1,590 ) U.S. government agency securities 30,033 (62 ) — — 30,033 (62 ) Total $ 522,536 $ (1,592 ) $ 47,940 $ (60 ) $ 570,476 $ (1,652 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets and Liabilities 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 at June 30, 2017 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 217,219 $ — $ 217,219 Certificates of deposit — 1,000 1,000 U.S. government agency securities — 607,548 607,548 Short-term investments: Commercial paper — 68,075 68,075 Corporate notes and bonds — 387,571 387,571 Certificates of deposit — 17,505 17,505 U.S. government agency securities — 23,354 23,354 Marketable equity securities 22,214 — 22,214 Long-term investments: Corporate notes and bonds — 268,076 268,076 Certificates of deposit — 18,884 18,884 U.S. government agency securities — 32,835 32,835 Total $ 239,433 $ 1,424,848 $ 1,664,281 The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis at December 31, 2016 (in thousands): Level 1 Level 2 Total Cash equivalents: Money market funds $ 165,627 $ — $ 165,627 Short-term investments: Commercial paper — 56,839 56,839 Corporate notes and bonds — 388,429 388,429 Certificates of deposit — 35,355 35,355 U.S. government agency securities — 17,501 17,501 Long-term investments: Corporate notes and bonds — 238,125 238,125 U.S. government agency securities — 24,533 24,533 Total $ 165,627 $ 760,782 $ 926,409

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2017
DxContinuum, Inc.
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	The following table summarizes the allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date: Purchase Price Allocation (in thousands) Useful Life (in years) Net tangible assets acquired $ 37 Intangible assets: Developed technology 6,400 5 Goodwill 11,159 Net deferred tax liabilities (1) (2,561 ) Total purchase price $ 15,035 (1)
BrightPoint Security
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	The following table summarizes the allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date: Purchase Price Allocation (in thousands) Useful Life (in years) Intangible assets: Developed technology $ 8,100 6 Customer contracts and related relationships 500 1.5 Goodwill 15,258 Net tangible liabilities acquired (1,339 ) Net deferred tax liabilities (1) (2,890 ) Total purchase price $ 19,629 (1)
ITapp
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	The following table summarizes the allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date: Purchase Price Allocation (in thousands) Useful Life (in years) Net tangible assets acquired $ 140 Intangible assets: Developed technology 4,700 5 Customer contracts and related relationships 200 1.5 Goodwill 11,437 Net deferred tax liabilities (1) (2,015 ) Total purchase price $ 14,462 (1)
BrightPoint Security and ITapp
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Information	The following pro forma consolidated financial information combines the results of operations from us, BrightPoint and ITapp for the three and six months ended June 30, 2016 , as if the acquisitions of BrightPoint and ITapp had occurred on January 1, 2016 (in thousands, except share and per share data): Three Months Ended June 30, 2016 Six Months Ended June 30, 2016 Revenues $ 341,631 $ 647,898 Net loss $ (50,674 ) $ (386,299 ) Weighted-average shares used to compute net loss per share - basic and diluted 163,838,755 162,952,721 Net loss per share - basic and diluted $ (0.31 ) $ (2.37 )

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill balances are presented below (in thousands): Carrying Amount Balance as of December 31, 2016 $ 82,534 Goodwill acquired 16,159 Foreign currency translation adjustments 5,737 Balance as of June 30, 2017 $ 104,430
Schedule of Intangible Assets	Intangible assets consist of the following (in thousands): June 30, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 90,033 $ (39,782 ) $ 50,251 Patents 23,780 (1,874 ) 21,906 Other 1,775 (1,345 ) 430 Total intangible assets $ 115,588 $ (43,001 ) $ 72,587 During the six months ended June 30, 2017 , we acquired patents with a weighted average useful life of 10 years for an aggregate purchase price of $6.2 million . December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 79,206 $ (30,858 ) $ 48,348 Patents 17,610 (867 ) 16,743 Other 1,775 (1,012 ) 763 Total intangible assets $ 98,591 $ (32,737 ) $ 65,854
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table presents the estimated future amortization expense related to intangible assets held at June 30, 2017 (in thousands): Years Ending December 31, 2017 $ 9,502 2018 18,491 2019 18,410 2020 8,585 2021 6,665 Thereafter 10,934 Total future amortization expense $ 72,587

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Summary of Property and Equipment, Net	Property and equipment, net consists of the following (in thousands): June 30, December 31, 2017 2016 Computer equipment $ 272,883 $ 222,648 Computer software 39,781 32,132 Leasehold improvements 39,836 37,095 Furniture and fixtures 34,746 31,574 Building 7,063 6,379 Construction in progress 7,731 2,535 402,040 332,363 Less: Accumulated depreciation (188,539 ) (150,743 ) Total property and equipment, net $ 213,501 $ 181,620

Accrued Expenses and Other Cu28

Accrued Expenses and Other Current Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
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): June 30, December 31, 2017 2016 Taxes payable $ 16,752 $ 19,472 Bonuses and commissions 54,465 67,259 Accrued compensation 34,760 30,816 Other employee related liabilities 31,926 28,812 Other 35,605 25,277 Total accrued expenses and other current liabilities $ 173,508 $ 171,636

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	6 Months Ended
	Jun. 30, 2017
Convertible Notes Payable [Abstract]
Summary of Convertible Senior Notes	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 June 30, 2017 December 31, 2016 Liability component: Principal: 2022 Notes $ 782,500 $ — 2018 Notes 575,000 575,000 Less: debt issuance cost and debt discount, net of amortization 2022 Notes (167,754 ) $ — 2018 Notes (49,683 ) (67,188 ) Net carrying amount $ 1,140,063 $ 507,812 2022 Notes 2018 Notes Equity component recorded at issuance: Note 162,039 155,319 Issuance cost (2,148 ) (3,257 ) Net amount recorded in equity 159,891 152,062
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The estimated fair values of the Notes at June 30, 2017 and December 31, 2016 based on the closing trading price per $100 of the Notes were as follows (in thousands): June 30, 2017 December 31, 2016 2022 Notes $ 796,976 N/A 2018 Notes $ 833,808 $ 681,375
Schedule of Interest Expense	The following table sets forth total interest expense recognized related to the Notes (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Amortization of debt issuance cost 2022 Notes $ 122 $ — $ 122 $ — 2018 Notes 474 442 940 877 Amortization of debt discount 2022 Notes 2,388 — 2,388 — 2018 Notes 8,353 7,806 16,565 15,480 Total $ 11,337 $ 8,248 $ 20,015 $ 16,357 Effective interest rate of the liability component 2022 Notes 4.75% 2018 Notes 6.50%
Schedule of Note Hedges	Purchase Shares (in thousands) 2022 Note Hedge $ 128,017 5,806,936 2018 Note Hedge $ 135,815 7,783,023
Schedule of Warrants	Warrants Proceeds Shares Strike Price (in thousands) 2022 Warrants $ 54,071 5,806,936 $ 203.40 2018 Warrants $ 84,525 7,783,023 $ 107.46

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive loss, net of tax, consist of the following (in thousands): June 30, December 31, 2017 2016 Foreign currency translation adjustment $ (7,184 ) $ (19,277 ) Net unrealized gain (loss) on investments, net of tax 6,251 (1,856 ) Accumulated other comprehensive loss $ (933 ) $ (21,133 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Common Stock Outstanding and Reserved Shares of Common Stock for Future Issuance	As of June 30, 2017 , we had 170,712,093 shares of common stock outstanding and had reserved shares of common stock for future issuance as follows: June 30, 2017 Stock plans: Options outstanding 4,992,394 RSUs 13,270,087 Shares of common stock available for future grants: 2012 Equity Incentive Plan (1) 25,602,145 2012 Employee Stock Purchase Plan (1) 9,868,010 Total reserved shares of common stock for future issuance 53,732,636 (1) Refer to Note 12 for a description of these plans.

Equity Awards (Tables)

Equity Awards (Tables)	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock Option Activity	A summary of the stock option activity for the six months ended June 30, 2017 is as follows: Number of Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2016 5,818,435 $ 20.57 Granted 566,720 84.81 Exercised (697,446 ) 15.77 $ 51,560 Canceled (38,334 ) 71.68 Outstanding at March 31, 2017 5,649,375 $ 27.26 Granted 50,000 103.60 Exercised (705,807 ) 8.62 $ 62,617 Canceled (1,174 ) 57.78 Outstanding at June 30, 2017 4,992,394 $ 30.65 5.57 $ 376,150 Vested and expected to vest as of June 30, 2017 4,919,086 $ 29.99 5.52 $ 373,914 Vested and exercisable as of June 30, 2017 3,772,067 $ 15.16 4.42 $ 342,656
Schedule of Restricted Stock Unit Activity	A summary of RSU activity for the six months ended June 30, 2017 is as follows: Number of Shares Weighted Average Grant Date Fair Value (Per Share) Aggregate Intrinsic Value (in thousands) Non-vested at December 31, 2016 12,222,282 $ 63.66 Granted 4,216,410 88.05 Vested (1,801,659 ) 55.73 $ 164,367 Forfeited (507,680 ) 73.14 Non-vested at March 31, 2017 14,129,353 71.60 Granted 763,940 97.79 Vested (1,177,903 ) 63.84 $ 115,487 Forfeited (445,303 ) 68.78 Non-vested at June 30, 2017 13,270,087 $ 73.89 $ 1,406,629

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders	The following table presents the calculation of basic and diluted net loss per share (in thousands, except share and per share data): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator: Net loss $ (56,473 ) $ (49,625 ) $ (97,135 ) $ (382,957 ) Denominator: Weighted-average shares outstanding—basic and diluted 170,419,083 163,838,755 169,585,356 162,952,721 Net loss per share—basic and diluted: $ (0.33 ) $ (0.30 ) $ (0.57 ) $ (2.35 )
Summary of Potentially Dilutive Securities	Potentially dilutive securities that are not included in the calculation of diluted net loss per share because doing so would be antidilutive are as follows: June 30, 2017 2016 Common stock options 4,992,394 6,902,902 Restricted stock units 13,270,087 13,274,438 ESPP obligations 286,176 288,467 2018 convertible senior notes 7,783,023 7,783,023 Warrants related to the issuance of 2018 convertible senior notes 7,783,023 7,783,023 2022 convertible senior notes 5,806,936 — Warrants related to the issuance of 2022 convertible senior notes 5,806,936 — Total potentially dilutive securities 45,728,575 36,031,853

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule	Future minimum payments under our non-cancelable operating leases and other contractual commitments outstanding as of June 30, 2017 are presented in the table below (in thousands): Leases, net of Sublease Income Purchase Obligations (1) Other Total Years Ending December 31, Remainder of 2017 $ 19,368 $ 12,879 $ 286 $ 32,533 2018 43,166 19,093 572 62,831 2019 45,418 10,614 572 56,604 2020 45,119 5,155 572 50,846 2021 43,637 3,172 572 47,381 Thereafter 167,473 162 1,621 169,256 Total $ 364,181 $ 51,075 $ 4,195 $ 419,451 (1) Consists of future minimum payments under non-cancelable purchase commitments primarily related to data center and IT operations and sales and marketing activities. Not included in the table above are certain purchase commitments related to our future annual Knowledge user conferences and other customer or sales conferences. If we were to cancel these contractual commitments as of June 30, 2017 , we would have been obligated to pay cancellation penalties of approximately $16.2 million in aggregate, of which $7.8 million is related to our Knowledge user conference in May 2018.

Information about Geographic 35

Information about Geographic Areas and Products (Tables)	6 Months Ended
	Jun. 30, 2017
Segments, Geographical Areas [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Revenues by geographic area, based on the location of our users, were as follows for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 North America (1) $ 322,263 $ 234,009 $ 607,844 $ 444,526 EMEA (2) 113,670 82,065 212,536 156,346 Asia Pacific and other 35,770 25,238 68,106 46,319 Total revenues $ 471,703 $ 341,312 $ 888,486 $ 647,191 Property and equipment, net by geographic area were as follows (in thousands): June 30, December 31, 2017 2016 North America (3) $ 150,604 $ 132,671 EMEA (2) 46,370 37,449 Asia Pacific and other 16,527 11,500 Total property and equipment, net $ 213,501 $ 181,620 (1) Revenues attributed to the United States were approximately 95% of North America revenues for each of the three months ended June 30, 2017 and 2016 , and each of the six months ended June 30, 2017 and 2016 . (2) Europe, the Middle East and Africa (3) Property and equipment, net attributed to the United States were approximately 90% and 92% of property and equipment, net attributable to North America as of June 30, 2017 and December 31, 2016
Schedule Of Subscription Revenue By Product	Subscription revenues consist of the following (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Service Management solutions $ 363,746 $ 264,667 $ 697,382 $ 509,273 IT Operations Management solutions 47,261 26,012 89,760 48,828 Total subscription revenues $ 411,007 $ 290,679 $ 787,142 $ 558,101

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
		Nov. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Nov. 30, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases, future minimum payments due			$ 364,000,000		$ 364,000,000
Revenues			471,703,000	$ 341,312,000	888,486,000	$ 647,191,000
Decrease to sales and marketing expense	[1]		(247,224,000)	$ (186,506,000)	$ (459,310,000)	$ (345,116,000)
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Commissions for on premise support and cloud-based subscription period of benefit, amortization period					5 years
Minimum | Accounting Standards Update 2014-09 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues							$ 14,000,000
Decrease to sales and marketing expense							20,000,000
Maximum | Accounting Standards Update 2014-09 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues							19,000,000
Decrease to sales and marketing expense							25,000,000
2018 convertible senior notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Face amount of debt			$ 575,000,000		$ 575,000,000		$ 575,000,000	$ 575,000,000
Stated interest rate								0.00%
Effective interest rate of the liability component			6.50%	6.50%	6.50%	6.50%
2018 convertible senior notes | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt discount classified as operating cash outflow		$ 155,300,000
Repayment of debt classified as financing cash outflow		$ 419,700,000
[1]	Includes stock-based compensation as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Cost of revenues: Subscription $ 8,942 $ 6,951 $ 16,880 $ 13,558 Professional services and other 7,617 6,136 14,566 12,895 Sales and marketing 42,287 32,861 80,688 63,859 Research and development 22,731 21,047 44,532 41,580 General and administrative 16,489 11,070 31,343 21,481

Investments - Summary of Invest

Investments - Summary of Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 827,189	$ 762,336
Gross Unrealized Gains	12,337	98
Gross Unrealized Losses	(1,012)	(1,652)
Estimated Fair Value	838,514	760,782
Due in 1 year or less	496,505
Due in 1 to 2 years	319,795
Total	816,300
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,075	56,839
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	68,075	56,839
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	656,402	628,054
Gross Unrealized Gains	123	91
Gross Unrealized Losses	(878)	(1,590)
Estimated Fair Value	655,647	626,555
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,389	35,355
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	36,389	35,355
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,323	42,088
Gross Unrealized Gains	0	7
Gross Unrealized Losses	(134)	(62)
Estimated Fair Value	56,189	$ 42,033
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,000
Gross Unrealized Gains	12,214
Gross Unrealized Losses	0
Estimated Fair Value	$ 22,214

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	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, fair value, less than 12 months	$ 577,043	$ 522,536
Available-for-sale securities, gross unrealized losses, less than 12 months	(1,011)	(1,592)
Available-for-sale securities, fair value, 12 months or greater	3,775	47,940
Available-for-sale securities, gross unrealized losses, 12 months or greater	(1)	(60)
Fair Value	580,818	570,476
Gross Unrealized Losses	(1,012)	(1,652)
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, fair value, less than 12 months	511,868	492,503
Available-for-sale securities, gross unrealized losses, less than 12 months	(877)	(1,530)
Available-for-sale securities, fair value, 12 months or greater	3,775	47,940
Available-for-sale securities, gross unrealized losses, 12 months or greater	(1)	(60)
Fair Value	515,643	540,443
Gross Unrealized Losses	(878)	(1,590)
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, fair value, less than 12 months	65,175	30,033
Available-for-sale securities, gross unrealized losses, less than 12 months	(134)	(62)
Available-for-sale securities, fair value, 12 months or greater	0	0
Available-for-sale securities, gross unrealized losses, 12 months or greater	0	0
Fair Value	65,175	30,033
Gross Unrealized Losses	$ (134)	$ (62)

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities maturities term maximum	24 months
Other than temporary impairment losses	$ 0
Other long-term investments	4,900,000		$ 11,000,000
Short-term investments	827,189,000		762,336,000
Payments to acquire other investments	3,900,000	$ 0
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	10,000,000
Unrealized holding gain	12,200,000
Level 3
Schedule of Available-for-sale Securities [Line Items]
Payments to acquire other investments	3,900,000
Investments	$ 1,400,000		$ 500,000

Fair Value Measurements (Detail

Fair Value Measurements (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 1,664,281	$ 926,409
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	239,433	165,627
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	1,424,848	760,782
Cash equivalents | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	217,219	165,627
Cash equivalents | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,000
Cash equivalents | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	607,548
Cash equivalents | Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	217,219	165,627
Cash equivalents | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Cash equivalents | Level 1 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	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 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,000
Cash equivalents | Level 2 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	607,548
Short-term investments | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	68,075	56,839
Short-term investments | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	387,571	388,429
Short-term investments | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	17,505	35,355
Short-term investments | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	23,354	17,501
Short-term investments | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	22,214
Short-term investments | Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Short-term investments | Level 1 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Short-term investments | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Short-term investments | Level 1 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Short-term investments | Level 1 | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	22,214
Short-term investments | Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	68,075	56,839
Short-term investments | Level 2 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	387,571	388,429
Short-term investments | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	17,505	35,355
Short-term investments | Level 2 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	23,354	17,501
Short-term investments | Level 2 | Marketable equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0
Long-term investments | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	268,076	238,125
Long-term investments | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	18,884
Long-term investments | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	32,835	24,533
Long-term investments | Level 1 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Long-term investments | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0
Long-term investments | Level 1 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Long-term investments | Level 2 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	268,076	238,125
Long-term investments | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	18,884
Long-term investments | Level 2 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 32,835	$ 24,533

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands	May 19, 2017	Jan. 20, 2017	Jun. 03, 2016	Apr. 08, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill					$ 104,430		$ 104,430		$ 82,534
Business acquisition, transaction costs					$ 1,400		$ 1,400
Weighted-average shares used to compute net loss per share - basic and diluted (in shares)					170,419,083	163,838,755	169,585,356	162,952,721
DxContinuum, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses		$ 15,000
Net tangible assets acquired		37
Goodwill		11,159
Net deferred tax liabilities		(2,561)
Total purchase price		15,035
Qlue, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses	$ 6,600
Goodwill	5,000
Net deferred tax liabilities	(1,100)
BrightPoint Security
Business Acquisition [Line Items]
Payments to acquire businesses			$ 19,600
Goodwill			15,258
Net tangible liabilities acquired			(1,339)
Net deferred tax liabilities			(2,890)
Total purchase price			19,629
ITapp
Business Acquisition [Line Items]
Payments to acquire businesses				$ 14,500
Net tangible assets acquired				140
Goodwill				11,437
Net deferred tax liabilities				(2,015)
Total purchase price				14,462
BrightPoint Security and ITapp
Business Acquisition [Line Items]
Business acquisition, transaction costs				1,000
Revenues						$ 341,631		$ 647,898
Net loss						$ (50,674)		$ (386,299)
Weighted-average shares used to compute net loss per share - basic and diluted (in shares)						163,838,755		162,952,721
Net loss per share - basic (in dollars per share)						$ (0.31)		$ (2.37)
Net loss per share - diluted (in dollars per share)						$ (0.31)		$ (2.37)
Developed technology | DxContinuum, Inc.
Business Acquisition [Line Items]
Intangible assets		$ 6,400
Finite-lived intangible asset, useful life		5 years
Developed technology | Qlue, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 2,600
Finite-lived intangible asset, useful life	5 years
Developed technology | BrightPoint Security
Business Acquisition [Line Items]
Intangible assets			$ 8,100
Finite-lived intangible asset, useful life			6 years
Developed technology | ITapp
Business Acquisition [Line Items]
Intangible assets				$ 4,700
Finite-lived intangible asset, useful life				5 years
Customer contracts and related relationships | BrightPoint Security
Business Acquisition [Line Items]
Intangible assets			$ 500
Finite-lived intangible asset, useful life			1 year 6 months
Customer contracts and related relationships | ITapp
Business Acquisition [Line Items]
Intangible assets				$ 200
Finite-lived intangible asset, useful life				1 year 6 months

Goodwill and Intangible Asset42

Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 82,534
Goodwill acquired	16,159
Foreign currency translation adjustments	5,737
Goodwill, end of period	$ 104,430

Goodwill and Intangible Asset43

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 115,588		$ 115,588		$ 98,591
Accumulated Amortization	(43,001)		(43,001)		(32,737)
Net Carrying Amount	72,587		72,587		65,854
2,017	9,502		9,502
2,018	18,491		18,491
2,019	18,410		18,410
2,020	8,585		8,585
2,021	6,665		6,665
Thereafter	10,934		10,934
Total future amortization expense	72,587		72,587
Amortization expense	4,800	$ 3,700	9,500	$ 6,600
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	90,033		90,033		79,206
Accumulated Amortization	(39,782)		(39,782)		(30,858)
Net Carrying Amount	50,251		50,251		48,348
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23,780		23,780		17,610
Accumulated Amortization	(1,874)		(1,874)		(867)
Net Carrying Amount	21,906		$ 21,906		16,743
Weighted average useful life of acquired patents			10 years
Aggregate purchase price of acquired patents			$ 6,200
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,775		1,775		1,775
Accumulated Amortization	(1,345)		(1,345)		(1,012)
Net Carrying Amount	$ 430		$ 430		$ 763

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 402,040		$ 402,040		$ 332,363
Less: Accumulated depreciation	(188,539)		(188,539)		(150,743)
Total property and equipment, net	213,501		213,501		181,620
Depreciation	22,200	$ 16,300	42,600	$ 30,800
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	272,883		272,883		222,648
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,781		39,781		32,132
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,836		39,836		37,095
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	34,746		34,746		31,574
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,063		7,063		6,379
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,731		$ 7,731		$ 2,535

Accrued Expenses and Other Cu45

Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]
Taxes payable	$ 16,752	$ 19,472
Bonuses and commissions	54,465	67,259
Accrued compensation	34,760	30,816
Other employee related liabilities	31,926	28,812
Other	35,605	25,277
Total accrued expenses and other current liabilities	$ 173,508	$ 171,636

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details)	6 Months Ended
	Jun. 30, 2017USD ($)day	Dec. 31, 2016USD ($)	Nov. 30, 2013USD ($)
Debt Instrument [Line Items]
Percentage of purchase price of Notes which should be paid upon fundamental change	100.00%
Stock Price Trigger Measurement [Member]
Debt Instrument [Line Items]
Trading days threshold | day	20
Consecutive trading days threshold, total	30 days
Threshold percentage of stock price trigger	130.00%
Notes Price Trigger Measurement [Member]
Debt Instrument [Line Items]
Trading days threshold | day	5
Consecutive trading days threshold, total	5 days
Conversion of notes base conversion price	$ 1,000
Threshold percentage of notes price trigger	98.00%
2022 Notes
Debt Instrument [Line Items]
Face amount of debt	$ 782,500,000	$ 0
Stated interest rate	0.00%
Remaining discount amortization period	59 months
2018 Notes
Debt Instrument [Line Items]
Face amount of debt	$ 575,000,000	$ 575,000,000	$ 575,000,000
Stated interest rate			0.00%
Remaining discount amortization period	16 months

Convertible Senior Notes - Sche

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

Convertible Senior Notes - Sc48

Convertible Senior Notes - Schedule of Notes Payable (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016	Nov. 30, 2013
Debt Instrument [Line Items]
Net carrying amount	$ 1,140,063,000	$ 507,812,000
2022 Notes
Debt Instrument [Line Items]
Principal	782,500,000	0
Less: debt issuance cost and debt discount, net of amortization	(167,754,000)	0
2018 Notes
Debt Instrument [Line Items]
Principal	575,000,000	575,000,000	$ 575,000,000
Less: debt issuance cost and debt discount, net of amortization	$ (49,683,000)	$ (67,188,000)

Convertible Senior Notes - Equi

Convertible Senior Notes - Equity Components (Details) $ in Thousands	Jun. 30, 2017USD ($)
2022 Notes
Debt Instrument [Line Items]
Note	$ 162,039
Issuance cost	(2,148)
Net amount recorded in equity	159,891
2018 Notes
Debt Instrument [Line Items]
Note	155,319
Issuance cost	(3,257)
Net amount recorded in equity	$ 152,062

Convertible Senior Notes - Sc50

Convertible Senior Notes - Schedule of Fair Value (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Fair value measurement, debt basis, closing trading price	$ 100	$ 100
Level 2 | 2022 Notes
Debt Instrument [Line Items]
Estimated fair values of notes	796,976,000
Level 2 | 2018 Notes
Debt Instrument [Line Items]
Estimated fair values of notes	$ 833,808,000	$ 681,375,000

Convertible Senior Notes - Sc51

Convertible Senior Notes - Schedule of Interest Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Total	$ 11,337	$ 8,248	$ 20,015	$ 16,357
2022 Notes
Debt Instrument [Line Items]
Amortization of debt issuance cost	122	0	122	0
Amortization of debt discount	$ 2,388	$ 0	$ 2,388	$ 0
Effective interest rate of the liability component	4.75%	4.75%	4.75%	4.75%
2018 Notes
Debt Instrument [Line Items]
Amortization of debt issuance cost	$ 474	$ 442	$ 940	$ 877
Amortization of debt discount	$ 8,353	$ 7,806	$ 16,565	$ 15,480
Effective interest rate of the liability component	6.50%	6.50%	6.50%	6.50%

Convertible Senior Notes - Sc52

Convertible Senior Notes - Schedule of Note Hedges (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Purchase	$ 128,017	$ 0
2022 Note Hedge
Derivative [Line Items]
Purchase	$ 128,017
Shares	5,806,936
2018 Note Hedge
Derivative [Line Items]
Purchase	$ 135,815
Shares	7,783,023

Convertible Senior Notes - Sc53

Convertible Senior Notes - Schedule of Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Class of Warrant or Right [Line Items]
Proceeds	$ 54,071	$ 0
2022 Warrants
Class of Warrant or Right [Line Items]
Proceeds	$ 54,071
Shares	5,806,936
Strike Price	$ 203.40
2018 Warrants
Class of Warrant or Right [Line Items]
Proceeds	$ 84,525
Shares	7,783,023
Strike Price	$ 107.46

Accumulated Other Comprehensi54

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Equity [Abstract]
Foreign currency translation adjustment	$ (7,184)	$ (19,277)
Net unrealized gain (loss) on investments, net of tax	6,251	(1,856)
Accumulated other comprehensive loss	$ (933)	$ (21,133)

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	May 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Shares of common stock, authorized (shares)		600,000,000
Shares of common stock, issued and sold (shares)		170,712,093
Stock issued during period, shares, new issues		3,822,126	3,710,925
Stock repurchased and retired during period (shares)	540,806		0
Stock repurchased and retired during period, value	$ 55
Stock repurchased and retired during period (in USD per share)	$ 101.70

Stockholders' Equity - Outstand

Stockholders' Equity - Outstanding and Reserved Shares of Common Stock for Future Issuance (Detail) - shares	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Common stock outstanding and reserved shares of common stock for future issuance
Options outstanding (in shares)	4,992,394	5,649,375	5,818,435
Total reserved shares of common stock for future issuance	53,732,636
2012 Equity Incentive Plan
Common stock outstanding and reserved shares of common stock for future issuance
Total reserved shares of common stock for future issuance	25,602,145
2012 Employee Stock Purchase Plan
Common stock outstanding and reserved shares of common stock for future issuance
Total reserved shares of common stock for future issuance	9,868,010
Options outstanding
Common stock outstanding and reserved shares of common stock for future issuance
Options outstanding (in shares)	4,992,394
RSUs
Common stock outstanding and reserved shares of common stock for future issuance
RSUs (in shares)	13,270,087	14,129,353	12,222,282

Equity Awards - Additional Info

Equity Awards - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)shares	Mar. 31, 2017shares	Jun. 30, 2017USD ($)incentive_plan$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Equity Incentive Plans | incentive_plan			2
Weighted-average grant date fair value of options granted (usd per share) | $ / shares			$ 37.57
Fair value of stock options vested | $			$ 5.3
Number of shares, granted	50,000	566,720
Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options | $	$ 33.8		$ 33.8
Options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period			3 years 6 months 18 days
Options outstanding | New President and CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted			396,720
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period			2 years 10 months 28 days
Unrecognized compensation expense expected to be recognized | $	$ 737.9		$ 737.9
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%
Number of additional shares authorized			8,371,539
2012 Equity Incentive Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized, 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%
Number of additional shares authorized			1,674,308
Common stock purchase price percentage			85.00%
Award offering period			6 months

Equity Awards - Summary of Stoc

Equity Awards - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017
Number of Shares
Number of shares, outstanding, beginning balance	5,649,375	5,818,435	5,818,435
Number of shares, granted	50,000	566,720
Number of shares, exercised	(705,807)	(697,446)
Number of shares, canceled	(1,174)	(38,334)
Number of shares, outstanding, ending balance	4,992,394	5,649,375	4,992,394
Number of shares, vested and expected to vest	4,919,086		4,919,086
Number of shares, vested and exercisable	3,772,067		3,772,067
Weighted- Average Exercise Price
Weighted-average exercise price, outstanding, beginning balance (in USD per share)	$ 27.26	$ 20.57	$ 20.57
Weighted-average exercise price, granted (in USD per share)	103.60	84.81
Weighted-average exercise price, exercised (in USD per share)	8.62	15.77
Weighted-average exercise price canceled (in USD per share)	57.78	71.68
Weighted-average exercise price, outstanding, ending balance (in USD per share)	30.65	$ 27.26	30.65
Weighted-average exercise price, vested and expected to vest (in USD per share)	29.99		29.99
Weighted-average exercise price, vested and exercisable (in USD per share)	$ 15.16		$ 15.16
Weighted-average remaining contractual term, outstanding			5 years 6 months 25 days
Weighted-average remaining contractual term, vested and expected to vest			5 years 6 months 7 days
Weighted-average remaining contractual term, vested and exercisable			4 years 5 months 1 day
Aggregate intrinsic value, exercised	$ 62,617	$ 51,560
Aggregate intrinsic value, outstanding	376,150		$ 376,150
Aggregate intrinsic value, vested and expected to vest	373,914		373,914
Aggregate intrinsic value, vested and exercisable	$ 342,656		$ 342,656

Equity Awards - Restricted Stoc

Equity Awards - Restricted Stock Unit Table (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017
Number of Shares
Number of shares, nonvested, beginning balance	14,129,353	12,222,282
Number of shares, granted	763,940	4,216,410
Number of shares, vested	(1,177,903)	(1,801,659)
Number of shares, forfeited	(445,303)	(507,680)
Number of shares, nonvested, ending balance	13,270,087	14,129,353
Weighted Average Grant Date Fair Value (Per Share)
Weighted-average grant date fair value, outstanding, beginning balance (in USD per share)	$ 71.60	$ 63.66
Weighted average grant date fair value, granted (in USD per share)	97.79	88.05
Weighted-average grant date fair value, vested (in USD per share)	63.84	55.73
Weighted-average grant date fair value, forfeited (in USD per share)	68.78	73.14
Weighted-average grant date fair value, outstanding, ending balance (in USD per share)	$ 73.89	$ 71.60
Aggregate intrinsic value, vested	$ 115,487	$ 164,367
Aggregate intrinsic value, non-vested	$ 1,406,629

Net Loss Per Share - Calculatio

Net Loss Per Share - Calculation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net loss	$ (56,473)	$ (49,625)	$ (97,135)	$ (382,957)
Denominator:
Weighted-average shares outstanding—basic and diluted (in shares)	170,419,083	163,838,755	169,585,356	162,952,721
Net loss per share—basic and diluted:
Net loss per share, basic and diluted (in USD per share)	$ (0.33)	$ (0.30)	$ (0.57)	$ (2.35)

Net Loss Per Share - Summary of

Net Loss Per Share - Summary of Potentially Dilutive Securities (Detail) - shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	45,728,575	36,031,853
Common stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	4,992,394	6,902,902
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	13,270,087	13,274,438
ESPP obligations
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	286,176	288,467
2018 convertible senior notes | Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	7,783,023	7,783,023
2022 convertible senior notes | Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	5,806,936	0
Warrants related to the issuance of 2018 convertible senior notes | Warrants related to the issuance of convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	7,783,023	7,783,023
Warrants related to the issuance of 2022 convertible senior notes | Warrants related to the issuance of convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	5,806,936	0

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	2.00%	9.00%	4.00%	1.00%
Federal statutory rate	34.00%	34.00%	34.00%	34.00%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Nov. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Legal settlements	$ 270,000,000
2022 convertible senior notes
Debt Instrument [Line Items]
Face amount of debt		$ 782,500,000	$ 0
2018 convertible senior notes
Debt Instrument [Line Items]
Face amount of debt		$ 575,000,000	$ 575,000,000	$ 575,000,000

Commitments and Contingencies64

Commitments and Contingencies - Maturity of Obligations (Details) $ in Thousands	Jun. 30, 2017USD ($)
Leases, net of Sublease Income
Remainder of 2017	$ 19,368
2,018	43,166
2,019	45,418
2,020	45,119
2,021	43,637
Thereafter	167,473
Operating leases, future minimum payments due, net of sublease income, due, total	364,181
Purchase Obligations
Remainder of 2017	12,879
2,018	19,093
2,019	10,614
2,020	5,155
2,021	3,172
Thereafter	162
Unrecorded unconditional purchase obligation, total	51,075
Other
Remainder of 2017	286
2,018	572
2,019	572
2,020	572
2,021	572
Thereafter	1,621
Other commitment, total	4,195
Total
Remainder of 2017	32,533
2,018	62,831
2,019	56,604
2,020	50,846
2,021	47,381
Thereafter	169,256
Contractual obligation, total	419,451
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase obligations, cancellation policy	16,200
Knowledge User Conferences
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase obligations, cancellation policy	$ 7,800

Information about Geographic 65

Information about Geographic Areas and Products - Geographic Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Revenues by geography
Revenues	$ 471,703	$ 341,312	$ 888,486	$ 647,191
Percentage of U.S. revenues in North America	95.00%	95.00%	95.00%	95.00%
Property and equity by geography
Property and equipment, net	$ 213,501		$ 213,501		$ 181,620
Percentage of U.S. net property and equipment in North America	90.00%		90.00%		92.00%
North America
Revenues by geography
Revenues	$ 322,263	$ 234,009	$ 607,844	$ 444,526
Property and equity by geography
Property and equipment, net	150,604		150,604		$ 132,671
EMEA
Revenues by geography
Revenues	113,670	82,065	212,536	156,346
Property and equity by geography
Property and equipment, net	46,370		46,370		37,449
Asia Pacific and other
Revenues by geography
Revenues	35,770	$ 25,238	68,106	$ 46,319
Property and equity by geography
Property and equipment, net	$ 16,527		$ 16,527		$ 11,500

Information about Geographic 66

Information about Geographic Areas and Products - Subscription Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total subscription revenues	$ 411,007	$ 290,679	$ 787,142	$ 558,101
Service Management solutions
Segment Reporting Information [Line Items]
Total subscription revenues	363,746	264,667	697,382	509,273
IT Operations Management solutions
Segment Reporting Information [Line Items]
Total subscription revenues	$ 47,261	$ 26,012	$ 89,760	$ 48,828