Mandiant (MNDT) 10-Q 4 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 01, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	FIREEYE, INC.
Entity Central Index Key	1,370,880
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		178,368,034

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 163,374	$ 223,667
Short-term investments	711,637	712,058
Accounts receivable, net of allowance for doubtful accounts of $1,918 and $1,590 at March 31, 2017 and December 31, 2016, respectively	105,900	121,150
Inventories	6,195	5,955
Prepaid expenses and other current assets	30,278	25,081
Total current assets	1,017,384	1,087,911
Property and equipment, net	60,814	61,852
Goodwill	978,260	978,260
Intangible assets, net	229,245	244,032
Deposits and other long-term assets	10,292	10,910
TOTAL ASSETS	2,295,995	2,382,965
CURRENT LIABILITIES:
Accounts payable	25,487	20,269
Accrued and other current liabilities	22,067	22,997
Accrued compensation	50,083	96,004
Deferred revenue, current portion	396,628	397,118
Total current liabilities	494,265	536,388
Convertible senior notes, net	751,206	741,980
Deferred revenue, non-current portion	235,557	256,398
Other long-term liabilities	8,320	7,087
Total liabilities	1,489,348	1,541,853
Commitments and contingencies (NOTE 9)
Stockholders' equity:
Common stock, par value of $0.0001 per share; 1,000,000 shares authorized, 177,843 shares and 174,596 shares issued and outstanding as of March 31, 2017 and December 31, 2016, respectively	18	17
Additional paid-in capital	2,731,108	2,682,909
Treasury stock, at cost; 3,333 shares as of March 31, 2017 and December 31, 2016	(150,000)	(150,000)
Accumulated other comprehensive loss	(1,419)	(1,742)
Accumulated deficit	(1,773,060)	(1,690,072)
Total stockholders’ equity	806,647	841,112
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,295,995	$ 2,382,965

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,918	$ 1,590
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (shares)	177,843,000	174,596,000
Common stock, shares outstanding (shares)	177,843,000	174,596,000
Treasury stock (shares)	3,333,000	3,333,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue:
Product	$ 23,743	$ 33,707
Subscription and services	149,995	134,259
Total revenue	173,738	167,966
Cost of revenue:
Product	12,851	17,133
Subscription and services	51,754	54,297
Total cost of revenue	64,605	71,430
Total gross profit	109,133	96,536
Operating expenses:
Research and development	58,352	85,983
Sales and marketing	94,880	123,028
General and administrative	27,615	42,256
Restructuring charges	0	1,670
Total operating expenses	180,847	252,937
Operating loss	(71,714)	(156,401)
Interest income	2,032	1,465
Interest expense	(12,245)	(11,809)
Other income (expense), net	232	815
Loss before income taxes	(81,695)	(165,930)
Provision for (benefit from) income taxes	1,293	(10,030)
Net loss attributable to common stockholders	$ (82,988)	$ (155,900)
Net loss per share attributable to common stockholders, basic and diluted (usd per share)	$ (0.48)	$ (0.98)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic and diluted (shares)	172,236	158,781

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (82,988)	$ (155,900)
Change in net unrealized gains/(losses) on available-for-sale investments, net of tax	323	2,163
Comprehensive loss	$ (82,665)	$ (153,737)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (82,988)	$ (155,900)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	26,365	30,503
Stock-based compensation	43,889	64,239
Non-cash interest expense related to convertible senior notes	9,226	8,780
Change in fair value of contingent earn-out liability	13	0
Deferred income taxes	251	(11,053)
Other	2,119	938
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	14,584	43,144
Inventories	(1,090)	2,325
Prepaid expenses and other assets	(4,619)	(2,152)
Accounts payable	3,331	(3,391)
Accrued liabilities	(930)	902
Accrued transaction costs of acquiree	0	(7,727)
Accrued compensation	(7,006)	(8,989)
Deferred revenue	(21,331)	17,997
Other long-term liabilities	1,234	(2,132)
Net cash used in operating activities	(16,952)	(22,516)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment and demonstration units	(8,483)	(14,257)
Purchases of short-term investments	(98,480)	(88,805)
Proceeds from maturities of short-term investments	94,689	111,319
Proceeds from sales of short-term investments	3,620	0
Business acquisitions, net of cash acquired	0	(204,926)
Lease deposits	(70)	(678)
Net cash used in investing activities	(8,724)	(197,347)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt of acquired business	0	(8,842)
Payments for contingent earn-outs	(38,928)	0
Payment related to shares withheld for taxes	0	(1,124)
Proceeds from exercise of equity awards	4,311	2,840
Net cash used in financing activities	(34,617)	(7,126)
Net change in cash and cash equivalents	(60,293)	(226,989)
Cash and cash equivalents, beginning of period	223,667	402,102
Cash and cash equivalents, end of period	163,374	175,113
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes	727	1,888
Cash paid for interest	0	22
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Vesting of early exercised stock options	0	496
Common stock issued in connection with acquisitions	0	39,300
Contingent earn-out in connection with acquisitions	0	35,588
Purchases of property and equipment and demonstration units in accounts payable and accrued liabilities	$ 5,922	$ 5,779

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Description of Business FireEye, Inc., with principal executive offices located in Milpitas, California, was incorporated as NetForts, Inc. on February 18, 2004, under the laws of the State of Delaware, and changed its name to FireEye, Inc. on September 7, 2005. FireEye, Inc. and its wholly owned subsidiaries (collectively, the “Company”, “we”, “us” or “our”) is a leader in stopping advanced cyber attacks that use advanced malware, zero-day exploits, and APT (“Advanced Persistent Threat”) tactics. Our solutions supplement traditional and next-generation firewalls, Intrusion Prevention Systems (“IPS”), anti-virus, and gateways, which cannot stop advanced threats, leaving security holes in networks. We offer a solution that detects and blocks attacks across Web, email, endpoint, cloud and content (file) threat vectors, as well as latent malware resident on file shares. Our solutions address all stages of an attack lifecycle with a signature-less engine utilizing stateful attack analysis to detect zero-day threats. In February 2016, we acquired Invotas International Corporation (“Invotas”), a provider of security automation and orchestration technology. We paid upfront cash consideration of $17.7 million and issued 742,026 shares of our common stock with an estimated fair value of $11.1 million . In January 2016, we acquired iSIGHT Security, Inc. (d/b/a iSIGHT Partners, Inc.) (“iSIGHT”), one of the world’s leading providers of cyber threat intelligence for global enterprises. We paid upfront cash consideration of $192.8 million , incurred liabilities of $39.1 million contingent upon the achievement of a threat intelligence bookings target on or before the end of the second quarter of 2018, and issued 1,793,305 shares of our common stock with an estimated fair value of $29.9 million . We sell the majority of our products, subscriptions and services to end-customers through distributors, resellers, and strategic partners, with a lesser percentage of sales directly to end-customers. Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements include the accounts of FireEye, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”), and following the requirements of the Securities and Exchange Commission (“SEC”), for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. GAAP can be condensed or omitted. These unaudited condensed consolidated financial statements have been prepared on the same basis as our annual consolidated financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, that are necessary for a fair statement of our financial information. The results of operations for the three months ended March 31, 2017 are not necessarily indicative of the results to be expected for the year ending December 31, 2017 or for any other interim period or for any other future year. The balance sheet as of December 31, 2016 has been derived from audited consolidated financial statements at that date but does not include all of the information required by U.S. GAAP for annual consolidated financial statements. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended December 31, 2016 included in our Annual Report on Form 10-K, which was filed with the SEC on February 24, 2017 . Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Such management estimates include, but are not limited to, the best estimate of selling price for our products, subscriptions and services, commissions expense, bonus expense, future taxable income, contract manufacturer liabilities, litigation and settlement costs and other loss contingencies, fair value of our equity awards, achievement of targets for performance stock units, fair value of the liability and equity components of convertible senior notes and the purchase price allocation of acquired businesses. We base our estimates on historical experience and also on assumptions that we believe are reasonable. Changes in facts or circumstances may cause us to change our assumptions and estimates in future periods, and it is possible that actual results could differ from current or revised future estimates. Summary of Significant Accounting Policies There have been no significant changes to our significant accounting policies as of and for the three months ended March 31, 2017 , as compared to the significant accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2016 . Recent Accounting Pronouncements In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This standard eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge (i.e. Step 2 of the current guidance), instead measuring the impairment charge as the excess of the reporting unit's carrying amount over its fair value (i.e. Step 1 of the current guidance). The guidance is effective for us beginning in the first quarter of 2020, and should be applied prospectively. Early adoption is permitted for impairment testing dates after January 1, 2017. The adoption of this standard is not expected to have a significant impact on our consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. This standard changes the definition of a business by requiring at least one substantive process. It also states that if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, then the set of transferred assets and activities is not a business. The guidance is effective for us beginning in the first quarter of 2018, and should be applied prospectively. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This standard changes the impairment model for most financial assets and certain other instruments by introducing a current expected credit loss (CECL) model. The CECL model is a more forward-looking approach based on expected losses rather than incurred losses, requiring entities to estimate and record losses expected over the remaining contractual life of an asset. The guidance is effective for us beginning in the first quarter of 2020. Early adoption beginning in 2019 is permitted. We are currently evaluating the impact the adoption of this guidance will have on our consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This standard is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The guidance is effective for us beginning in the first quarter of 2019, and should be applied on a modified retrospective basis. Early adoption is permitted. We expect the adoption of this standard to have a material impact on our consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This standard provides a single model for revenue arising from contracts with customers and supersedes current revenue recognition guidance. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In July 2015, the FASB decided to defer the effective date by one year, and as a result, the guidance is effective for us beginning in the first quarter of 2018. Early adoption as of the original effective date would be permitted. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment. The FASB subsequently issued several clarifying standards to address stakeholder questions and implementation issues. We currently anticipate adopting the standard retrospectively to all prior periods presented. Our ability to apply the requirements retrospectively to all prior periods presented is dependent on system readiness, including software procured from third-party providers, and the completion of our analysis of information necessary to restate prior period financial statements. We anticipate this standard will have a material impact on our consolidated financial statements and related disclosures. While we are continuing to assess all the potential impacts this standard will have, and as such we do not know or cannot reasonably estimate quantitative information related to the impact of this standard on our consolidated financial statements at this time, we currently believe the most significant impact relates to our accounting for intelligence dependent appliance and software license revenue. We expect revenue related to certain appliances and software licenses not dependent on intelligence, subscription and support offerings, cloud offerings and professional services to remain substantially unchanged. Specifically, under the new standard we expect to combine intelligence dependent appliances and software licenses with the related intelligence subscription and support as a single performance obligation. As a result, we expect to recognize intelligence dependent appliance and software license revenue ratably over the life of the related device or license, rather than at the time of shipping, when our contracts contain material right of renewal options. Where our contracts do not contain material right of renewal options, we expect to recognize intelligence dependent appliance and software license revenue ratably over the contractual term. Due to complexity of certain of our customer contracts, the actual revenue recognition treatment required under the standard will be dependent on contract-specific terms, and may vary in some instance from the recognition models noted above. We currently believe appliance and software license revenue will be recognized predominantly over the useful life of the device or license as most of our appliance and license offerings are intelligence dependent. Additionally, we currently expect commissions expense to be deferred at the time of sale, and recognized ratably over the life of the related device or license or over the contractual term, rather than expensing commissions predominantly at the time of sale.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The accounting guidance for fair value measurements provides a framework for measuring fair value on either a recurring or nonrecurring basis, whereby the inputs used in our valuation techniques are assigned a hierarchical level. The following are the three levels of inputs to measure fair value: • Level 1: Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2: Inputs that reflect quoted prices for identical assets or liabilities in less active markets; quoted prices for similar assets or liabilities in active markets; benchmark yields, reported trades, broker/dealer quotes, inputs other than quoted prices that are observable for the assets or liabilities; or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3: Unobservable inputs that reflect our own assumptions incorporated in valuation techniques used to measure fair value. These assumptions are required to be consistent with market participant assumptions that are reasonably available. We consider an active market to be one in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis, and consider an inactive market to be one in which there are infrequent or few transactions for the asset or liability, the prices are not current, or price quotations vary substantially either over time or among market makers. Where appropriate, our own or the counterparty’s non-performance risk is considered in measuring the fair values of assets. The following table presents our assets and liabilities measured at fair value on a recurring basis using the above input categories (in thousands): As of March 31, 2017 As of December 31, 2016 Description Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents: Money market funds $ 2,896 $ — $ — $ 2,896 $ 449 $ — $ — $ 449 Total cash equivalents 2,896 — — 2,896 449 — — 449 Short-term investments: Certificates of deposit — 7,886 — 7,886 — 9,569 — 9,569 Commercial paper — 14,981 — 14,981 — 29,920 — 29,920 Corporate notes and bonds — 433,491 — 433,491 — 420,684 — 420,684 U.S. Government agencies — 255,279 — 255,279 — 251,885 — 251,885 Total short-term investments — 711,637 — 711,637 — 712,058 — 712,058 Total assets measured at fair value $ 2,896 $ 711,637 $ — $ 714,533 $ 449 $ 712,058 $ — $ 712,507 Liabilities Contingent earn-out $ — $ — $ 67 $ 67 $ — $ — $ 41,332 $ 41,332 Total liabilities measured at fair value $ — $ — $ 67 $ 67 $ — $ — $ 41,332 $ 41,332 The estimated fair value of the contingent earn-out incurred in connection with our acquisition of iSIGHT is considered to be a Level 3 measurement due to the use of significant unobservable inputs. The value was determined using a discounted risk-adjusted expected (probability-weighted) cash flow methodology, by applying a real options approach model. The real options approach incorporated management's estimates of expected quarterly growth rates in bookings for certain products ( 63% on average), which could not be corroborated by observable market data, with the volatility of revenue for comparable companies ( 16.5% on average) and the correlation between comparable companies' quarterly revenue growth and that of the S&P 500 Index ( 44.7% on average), which are observable in the market, to determine the probability of achieving estimated bookings within the earn-out period of performance ( 2.5 years ). The resulting expected earn-out payment was discounted back to present value using our cost of debt (ranging from 6.3% to 7.1% ). The following is a reconciliation of the Level 3 contingent earn-out liability (in thousands): Amount Balance as of December 31, 2016 $ 41,332 Changes in fair value (1) 13 Cash payments (41,278 ) Balance as of March 31, 2017 $ 67 (1) Changes in fair value are recorded in general and administrative expenses in our condensed consolidated statements of operations. Additionally, we have a restructuring liability related to certain real estate facilities which was calculated based on the present value of future lease payments, less estimated sublease income, discounted at a rate commensurate with our current cost of financing. This non-recurring fair value measurement is considered to be a Level 3 measurement due to the use of significant unobservable inputs. To the extent that actual sublease income or the timing of subleasing these facilities is different than initial estimates, we will adjust the restructuring liability in the period during which such information becomes known. See Note 6 Restructuring Charges for a reconciliation of this liability. We measure certain assets, including goodwill, intangible assets and our equity-method investment in a private company at fair value on a nonrecurring basis when there are identifiable events or changes in circumstances that may have a significant adverse impact on the fair value of these assets. No such events or changes occurred during the three months ended March 31, 2017 . The estimated fair value of the Convertible Senior Notes (as defined in Note 8) as of March 31, 2017 was determined to be $843.5 million , based on quoted market prices. We consider the fair value of the Convertible Senior Notes to be a Level 2 measurement as they are not actively traded.

Investments

Investments	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Our investments consisted of the following (in thousands): As of March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-Term Investment Certificates of deposit $ 7,880 $ 7 $ (1 ) $ 7,886 $ 7,886 Commercial paper 14,984 — (3 ) 14,981 14,981 Corporate notes and bonds 434,274 17 (800 ) 433,491 433,491 U.S. Government agencies 255,918 — (639 ) 255,279 255,279 Total $ 713,056 $ 24 $ (1,443 ) $ 711,637 $ 711,637 As of December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-Term Investment Certificates of deposit $ 9,560 $ 10 $ (1 ) $ 9,569 $ 9,569 Commercial paper 29,929 — (9 ) 29,920 29,920 Corporate notes and bonds 421,635 17 (968 ) 420,684 420,684 U.S. Government agencies 252,676 2 (793 ) 251,885 251,885 Total $ 713,800 $ 29 $ (1,771 ) $ 712,058 $ 712,058 The following tables present the gross unrealized losses and related fair values of our investments that have been in a continuous unrealized loss position (in thousands): As of March 31, 2017 Less Than 12 Months Greater Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Certificates of deposit $ — $ — $ 199 $ (1 ) $ 199 $ (1 ) Commercial paper 14,981 (3 ) — — 14,981 (3 ) Corporate notes and bonds 343,313 (761 ) 64,470 (39 ) 407,783 (800 ) U.S. Government agencies 233,786 (625 ) 14,994 (14 ) 248,780 (639 ) Total $ 592,080 $ (1,389 ) $ 79,663 $ (54 ) $ 671,743 $ (1,443 ) As of December 31, 2016 Less Than 12 Months Greater Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Certificates of deposit $ — $ — $ 199 $ (1 ) $ 199 $ (1 ) Commercial paper 24,925 (9 ) — — 24,925 (9 ) Corporate notes and bonds 294,818 (889 ) 99,433 (79 ) 394,251 (968 ) U.S. Government agencies 222,171 (763 ) 17,657 (30 ) 239,828 (793 ) Total $ 541,914 $ (1,661 ) $ 117,289 $ (110 ) $ 659,203 $ (1,771 ) Unrealized losses related to these investments are due to interest rate fluctuations as opposed to credit quality. In addition, we do not intend to sell, and it is not more likely than not that we would be required to sell, these investments before recovery of their cost basis. As a result, there is no other-than-temporary impairment for these investments as of March 31, 2017 and December 31, 2016 . The following table summarizes the contractual maturities of our investments at March 31, 2017 (in thousands): Amortized Cost Fair Value Due within one year $ 382,128 $ 381,674 Due within one to two years 330,928 329,963 Total $ 713,056 $ 711,637 All available-for-sale securities have been classified as current, based on management's intent and ability to use the funds in current operations. We hold an 11.9% ownership interest in a private company, which is accounted for under the equity method based on our ability to exercise significant influence over operating and financial policies of the investee. This investment is classified within deposits and other long-term assets on our condensed consolidated balance sheets. The carrying value of this investment was $0.6 million and $0.9 million as of March 31, 2017 and December 31, 2016 , respectively.

Property and Equipment

Property and Equipment	3 Months Ended
	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment, net consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Computer equipment and software $ 151,258 $ 144,892 Leasehold improvements 44,003 41,796 Furniture and fixtures 15,057 14,499 Machinery and equipment 447 447 Total property and equipment 210,765 201,634 Less: accumulated depreciation (149,951 ) (139,782 ) Total property and equipment, net $ 60,814 $ 61,852 Depreciation and amortization expense related to property and equipment and demonstration units during the three months ended March 31, 2017 and 2016 was $11.0 million and $14.1 million , respectively. During the three months ended March 31, 2017 and 2016 , we capitalized $4.7 million and $1.9 million , respectively, of software development costs related to our cloud subscription offerings. Amortization expense related to capitalized software development costs during the three months ended March 31, 2017 and 2016 was $0.8 million and $0.4 million , respectively.

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Business Combinations	Business Combinations Acquisition of iSIGHT On January 14, 2016, we acquired all of the outstanding shares of privately held iSIGHT, one of the world’s leading providers of cyber threat intelligence for global enterprises. The acquisition extends our intelligence network to create an advanced and comprehensive private cyber threat intelligence operation, providing customers with higher fidelity alerts, context to prioritize threats and the strategic insights to proactively prepare for threats that might target their industry or region. In connection with this acquisition, we paid upfront cash consideration of $192.8 million , incurred liabilities of $39.1 million contingent upon the achievement of a threat intelligence bookings target on or before the end of the second quarter of 2018, and issued 1,793,305 shares of our common stock with an estimated fair value of $29.9 million , of which 1,793,297 shares were released in February 2017 to former stockholders of iSIGHT once the threat intelligence bookings target was determined to have been achieved. This resulted in total purchase consideration of $261.8 million . The number of shares was fixed at the completion of the acquisition and was the maximum number of shares that could be released. The contingent earn-out liability was also settled in February 2017 to former stockholders of iSIGHT once the threat intelligence bookings target was determined to have been achieved, resulting in a cash payment of $41.3 million . The acquisition of iSIGHT was accounted for in accordance with the acquisition method of accounting for business combinations with FireEye as the accounting acquirer. Under the acquisition method of accounting, the total purchase consideration is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values, using information currently available to us. During the three months ended June 30, 2016, we finalized our valuation analysis and revised our preliminary estimates of the earn-out liability and related fair value of common stock contingent upon the achievement of a threat intelligence bookings target by $3.5 million and $1.7 million , respectively, resulting in a higher purchase price of $5.2 million . As a result, we also revised our preliminary estimate of customer relationship and content intangible assets by $1.1 million and $1.2 million , respectively, resulting in an additional $0.2 million of intangible amortization. We expensed the related acquisition costs of $1.9 million in general and administrative expenses. We also assumed and paid liabilities of $7.0 million for transaction costs incurred by iSIGHT prior to acquisition, which were accounted for separate from consideration transferred. Allocation of the purchase price of $261.8 million is as follows (in thousands): Amount Net tangible liabilities assumed $ (18,248 ) Intangible assets 85,100 Deferred tax liability (11,637 ) Goodwill 206,623 Total purchase price allocation $ 261,838 The purchase price exceeded the fair value of the net tangible and identifiable intangible assets acquired, resulting in the recognition of goodwill. Goodwill is primarily attributable to expected synergies in our subscription offerings and cross-selling opportunities. None of the goodwill is expected to be deductible for U.S. federal income tax purposes. Intangible assets consist primarily of customer relationships, content, developed technology and other intangible assets. Customer relationship intangibles relate to iSIGHT's ability to sell current and future content, as well as products built around this content, to its existing customers. Content intangibles represent threat intelligence data gathered through the analysis of cyber-crimes, cyber attacks, hacking, and cyber criminals. Intangible assets attributable to developed technology include a combination of patented and unpatented technology, trade secrets, computer software and research processes that represent the foundation for the existing and planned new products to facilitate the generation of new content. The estimated useful life and fair values of the identifiable intangible assets are as follows (in thousands): Estimated Useful Life (in years) Amount Customer relationships 7 $ 33,700 Content 4 30,100 Developed technology 4-6 17,100 Trade name 5 3,100 Non-competition agreements 2 1,100 Total identifiable intangible assets $ 85,100 The value of customer relationships and content was estimated using the excess earnings method, an income approach (Level 3), which converts projected revenues and costs into cash flows. To reflect the fact that certain other assets contribute to the cash flows generated, the returns for these contributory assets were removed to arrive at estimated cash flows solely attributable to the customer relationships and content, which were discounted at rates of 15% and 14% , respectively. The value of developed technology and the trade name was estimated using the relief-from-royalty method, an income approach (Level 3), which estimates the cost savings that accrue to the owner of the intangible asset that would otherwise be payable as royalties or license fees on revenues earned through the use of the asset. A royalty rate is applied to the projected revenues associated with the intangible asset to determine the amount of savings, which is then discounted to determine the fair value. The developed technology and trade name were valued using royalty rates of 10% and 1% , respectively, and discounted at rates of 14% and 15% , respectively. The results of operations of iSIGHT have been included in our condensed consolidated statements of operations from the acquisition date, and contributed $9.4 million to our consolidated revenues and $2.3 million to our consolidated net loss during the three months ended March 31, 2016. Subsequent to March 31, 2016, the operations of iSIGHT were integrated with the Company's operations. Pro forma results of operations have not been presented because the acquisition was not material to our results of operations. Acquisition of Invotas On February 1, 2016, we acquired all of the outstanding shares of privately held Invotas, a provider of security automation and orchestration technology. This acquisition enables us to deliver a premier security orchestration capability as part of our global threat management platform to unify cyber attack detection results, threat intelligence and incident response elements of an organization’s security program into a single console, giving enterprises the ability to respond more quickly to attacks through automation. In connection with this acquisition, we paid upfront cash consideration of $17.7 million and issued 742,026 shares of our common stock with an estimated fair value of $11.1 million . This resulted in total purchase consideration of $28.8 million . Additionally, we replaced unvested option awards with grants of 95,614 restricted stock units which will vest over the requisite service period of four years, and granted an additional 1,002,748 restricted stock units which were scheduled to vest upon the achievement of stated performance milestones over a period of approximately three years, subject to continuing service during that time. A portion of these awards have since been released following the achievement of the first milestone, while another portion of these awards were modified to vest subject only to continuing service. These awards are being recognized as operating expense over the requisite service periods as they relate to post-combination services. The acquisition of Invotas was accounted for in accordance with the acquisition method of accounting for business combinations with FireEye as the accounting acquirer. We expensed the related acquisition costs of $0.5 million in general and administrative expenses. We also assumed and paid liabilities of $0.7 million for transaction costs incurred by Invotas prior to acquisition, which were accounted for separate from consideration transferred. Under the acquisition method of accounting, the total purchase consideration is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values. The total purchase price of $28.8 million was allocated using information currently available to us. Allocation of the purchase price is as follows (in thousands): Amount Net tangible liabilities assumed $ (306 ) Intangible assets 8,400 Deferred tax liability (688 ) Goodwill 21,349 Total purchase price allocation $ 28,755 The purchase price exceeded the fair value of the net tangible and identifiable intangible assets acquired, resulting in the recognition of goodwill. Goodwill is primarily attributable to increased selling opportunities. None of the goodwill is expected to be deductible for U.S. federal income tax purposes. Intangible assets consist primarily of developed technology, in-process research and development and other intangible assets. Developed technology intangibles include a combination of patented and unpatented technology, trade secrets, computer software and research processes that represent the foundation for the existing and planned new product offerings. The in-process research and development intangible represents the estimated fair value of acquired research projects which had not reached technological feasibility at acquisition date, but have since been developed into products. The estimated useful life and fair values of the identifiable intangible assets are as follows (in thousands): Estimated Useful Life (in years) Amount Developed technology 4 $ 4,500 In-process research and development N/A 2,800 Customer relationships 10 800 Non-competition agreements 3 300 Total identifiable intangible assets $ 8,400 The value of developed technology and in-process research and development (IPR&D) was estimated using the excess earnings method, an income approach (Level 3), which converts projected revenues and costs into cash flows. To reflect the fact that certain other assets contribute to the cash flows generated, the returns for these contributory assets were removed to arrive at estimated cash flows solely attributable to the developed technology and IPR&D, which were discounted at rates of 16% and 17% , respectively. As of December 31, 2016, all in-process research and development obtained in our acquisition of Invotas was put into service. The results of operations of Invotas have been included in our condensed consolidated statements of operations from the acquisition date. Pro forma results of operations have not been presented because the acquisition was not material to our results of operations. Goodwill and Purchased Intangible Assets There were no changes in the carrying amount of goodwill for the three months ended March 31, 2017 . Purchased intangible assets consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Developed technology $ 102,593 $ 102,593 Content 158,700 158,700 Customer relationships 109,800 109,800 Contract backlog 12,500 12,500 Trade names 15,500 15,500 Non-competition agreements 1,400 1,400 Total intangible assets 400,493 400,493 Less: accumulated amortization (171,248 ) (156,461 ) Total net intangible assets $ 229,245 $ 244,032 Amortization expense of intangible assets during the three months ended March 31, 2017 and 2016 was $14.8 million and $15.2 million , respectively. The expected future annual amortization expense of intangible assets as of March 31, 2017 is presented below (in thousands): Years Ending December 31, Amount 2017 (remaining nine mon ths) $ 44,331 2018 47,433 2019 45,547 2020 31,171 2021 29,282 2022 and thereafter 31,481 Total $ 229,245

Restructuring Charges

Restructuring Charges	3 Months Ended
	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring Charges	Restructuring Charges We initiated a series of restructuring activities during 2016, including a restructuring plan approved by our Board of Directors designed to reduce operating expenses and align our expense structure with growth expectations. This restructuring plan resulted in a 10% reduction in our workforce, the consolidation of certain real estate facilities and the impairment of certain assets in 2016. The following table sets forth a summary of restructuring activities during the three months ended March 31, 2017 (in thousands): Severance and related costs Facilities costs Total costs Balance, December 31, 2016 $ 1,221 $ 2,246 $ 3,467 Cash payments (686 ) (289 ) (975 ) Other adjustments (380 ) (59 ) (439 ) Balance, March 31, 2017 $ 155 $ 1,898 $ 2,053 Other adjustments of negative $0.4 million represent relief of unused benefits, changes in fair value and foreign currency fluctuations. The remaining restructuring balance of $2.1 million at March 31, 2017 is composed of $0.2 million of severance payments which we expect to pay during the second quarter of 2017, and $1.9 million of non-cancelable lease costs which we expect to pay over the terms of the related obligations through the third quarter of 2024, net of sublease income.

Deferred Revenue

Deferred Revenue	3 Months Ended
	Mar. 31, 2017
Revenue Recognition [Abstract]
Deferred Revenue	Deferred Revenue Deferred revenue consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Product, current $ 9,245 $ 8,924 Subscription and services, current 387,383 388,194 Total deferred revenue, current 396,628 397,118 Product, non-current 4,059 4,748 Subscription and services, non-current 231,498 251,650 Total deferred revenue, non-current 235,557 256,398 Total deferred revenue $ 632,185 $ 653,516

Convertible Senior Notes

Convertible Senior Notes	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes Convertible Senior Notes In June 2015, we issued $460.0 million principal amount of 1.000% Convertible Senior Notes due 2035 (the “Series A Notes”) and $460.0 million principal amount of 1.625% Convertible Senior Notes due 2035 (the “Series B Notes” and together with the Series A Notes, the “Convertible Senior Notes”), including the full exercise of the initial purchasers' over-allotment option, in a private placement to qualified institutional purchasers pursuant to an exemption from registration provided by Section 4(a)(2) and Rule 144A under the Securities Act of 1933, as amended. The net proceeds after the initial purchasers' discount of $23.0 million and issuance costs of $0.5 million from the Convertible Senior Notes were $896.5 million . The Series A Notes and Series B Notes bear interest at 1.000% per year and 1.625% per year, respectively, payable semiannually in arrears on June 1 and December 1 of each year, beginning December 1, 2015. The Convertible Senior Notes mature on June 1, 2035, unless earlier repurchased, redeemed or converted. The Convertible Senior Notes are unsecured obligations and rank senior in right of payment to any of our indebtedness that is expressly subordinated in right of payment to the Convertible Senior Notes. They rank equally in right of payment with all of our existing and future liabilities that are not expressly subordinated to the Convertible Senior Notes and effectively rank junior in right of payment to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness. They are structurally junior to all indebtedness and other liabilities (including trade payables) of our subsidiaries. The Convertible Senior Notes do not contain any financial covenants and do not restrict us from paying dividends or issuing or repurchasing our other securities. The initial conversion rate on each series of Convertible Senior Notes is 16.4572 shares of our common stock per $1,000 principal amount of Convertible Senior Notes, which is equivalent to an initial conversion price of approximately $60.76 per share of common stock. The conversion rate of each series of Convertible Senior Notes may be adjusted upon the occurrence of certain specified events, but not for accrued and unpaid interest. Holders may convert the Convertible Senior Notes at their option in multiples of $1,000 principal amount prior to March 1, 2035, excluding the period from March 1, 2020 to June 1, 2020 in the case of the Series A Notes and March 1, 2022 to June 1, 2022 in the case of the Series B Notes, only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ended on September 30, 2015 (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 a 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 conversion price for the Convertible Senior Notes of the relevant series on each applicable trading day; • during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of Series A Notes or Series B Notes, as applicable, 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 conversion rate for the notes of the relevant series on each such trading day; • if we call any or all of the Convertible Senior Notes of a series for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the relevant redemption date; or • upon the occurrence of specified corporate events, as specified in each indenture governing the Convertible Senior Notes. Regardless of the foregoing conditions, holders may convert their Convertible Senior Notes at their option in multiples of $1,000 principal amount at any time during the period from March 1, 2020 to June 1, 2020 in the case of the Series A Notes and during the period from March 1, 2022 to June 1, 2022 in the case of the Series B Notes, or after March 1, 2035 until maturity for either series of Convertible Senior Notes. Upon conversion, the Convertible Senior Notes can be settled in cash, shares of our common stock or any combination thereof at our option. We may be required by holders of the Convertible Senior Notes to repurchase all or any portion of their Convertible Senior Notes at 100% of the principal amount plus accrued and unpaid interest, on each of June 1, 2020, June 1, 2025 and June 1, 2030, in the case of the Series A Notes, and each of June 1, 2022, June 1, 2025 and June 1, 2030 in the case of the Series B Notes. Holders may also require us to repurchase the Convertible Senior Notes if we undergo a "fundamental change," as defined in each indenture governing the Convertible Senior Notes, at a purchase price equal to 100% of the principal amount, plus accrued and unpaid interest. Additionally, we may redeem for cash all or any portion of the Series B Notes on or after June 1, 2020 until June 1, 2022 if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending not more than three trading days immediately preceding the date we provide notice of redemption. We also may redeem for cash all or any portion of the Series A Notes on or after June 1, 2020 until maturity and all or any portion of the Series B Notes on or after June 1, 2022 until maturity, regardless of the foregoing sale price condition. In accordance with accounting for debt with conversions and other options, we allocated the principal amount of the Convertible Senior Notes into liability and equity components. We also allocated the total amount of initial purchasers' discount and transaction costs incurred to the liability and equity components using the same proportions as the proceeds from the Convertible Senior Notes. Transaction costs of $0.4 million and $0.1 million and initial purchasers' discount of $17.6 million and $5.4 million were attributable to the liability component and equity component of the Convertible Senior Notes, respectively. The liability and equity components of the Convertible Senior Notes consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Series A Notes Series B Notes Series A Notes Series B Notes Liability component: Principal $ 460,000 $ 460,000 $ 460,000 $ 460,000 Less: Convertible senior notes discounts and issuance costs, net of amortization (69,132 ) (99,662 ) (74,126 ) (103,894 ) Net carrying amount $ 390,868 $ 360,338 $ 385,874 $ 356,106 Equity component, net of issuance costs $ 92,567 $ 117,834 $ 92,567 $ 117,834 The unamortized discounts and issuance costs as of March 31, 2017 will be amortized over a weighted-average remaining period of approximately 4.3 years . Interest expense for the three months ended March 31, 2017 related to the Convertible Senior Notes consisted of the following (in thousands): Three Months Ended March 31, 2017 Series A Notes Series B Notes Coupon interest $ 1,150 $ 1,869 Amortization of convertible senior notes discounts and issuance costs 4,993 4,232 Total interest expense recognized $ 6,143 $ 6,101 Effective interest rate on the liability component 6.4 % 6.9 % Interest expense for the three months ended March 31, 2016 related to the Convertible Senior Notes consisted of the following (in thousands): Three Months Ended March 31, 2016 Series A Notes Series B Notes Coupon interest $ 1,150 $ 1,869 Amortization of convertible senior notes discounts and issuance costs 4,743 4,037 Total interest expense recognized $ 5,893 $ 5,906 Effective interest rate on the liability component 6.4 % 7.0 % Prepaid Forward Stock Purchase In connection with the issuance of the Convertible Senior Notes, we also entered into privately negotiated prepaid forward stock purchase transactions (each a “Prepaid Forward”) with one of the initial purchasers of the Convertible Senior Notes (the “Forward Counterparty”), pursuant to which we paid approximately $150.0 million . The amount of the prepaid is equivalent to approximately 3.3 million shares which are to be settled on or around June 1, 2020 and June 1, 2022, respectively, subject to any early settlement, in whole or in part, of each Prepaid Forward. The Prepaid Forwards are intended to facilitate privately negotiated derivative transactions by which investors in the Convertible Senior Notes will be able to hedge their investment in the Convertible Senior Notes. In the event we pay any cash dividends on our common stock, the Forward Counterparty will pay an equivalent amount back to us. The related shares were accounted for as a repurchase of common stock, and are presented as Treasury Stock in the unaudited condensed consolidated balance sheets. The 3.3 million shares of common stock purchased under the Prepaid Forwards are excluded from weighted-average shares outstanding for basic and diluted EPS purposes although they remain legally outstanding.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases We lease our facilities under various non-cancelable operating leases, which expire on various dates through the year ending December 31, 2027. In August 2016, we entered into a lease agreement for our new corporate headquarters, expected to commence mid-2017. Rent expense is recognized using the straight-line method over the term of the lease. Rent expense, net of sublease income, was $4.1 million and $3.6 million for the three months ended March 31, 2017 and 2016 , respectively. The aggregate future non-cancelable minimum rental payments on our operating leases, as of March 31, 2017 , are as follows (in thousands): Years Ending December 31, Amount 2017 (remaining nine months) $ 11,822 2018 16,553 2019 12,915 2020 12,787 2021 10,992 2022 and thereafter 39,276 Total $ 104,345 Total future non-cancelable minimum rental payments have not been reduced by future minimum sublease rentals totaling $7.1 million . We are party to letters of credit totaling $3.2 million and $3.1 million as of March 31, 2017 and December 31, 2016 , respectively, issued primarily in support of operating leases at several of our facilities. These letters of credit are collateralized by a line with our bank. No amounts have been drawn against these letters of credit. Contract Manufacturer Commitments Our independent contract manufacturers procure components and assemble our products based on our forecasts. These forecasts are based on estimates of future demand for our products, which are in turn based on historical trends and an analysis from our sales and product marketing organizations, adjusted for overall market conditions. In order to reduce manufacturing lead times and plan for adequate supply, we may issue forecasts and orders for components and products that are non-cancelable. As of March 31, 2017 and December 31, 2016 , we had non-cancelable open orders of $12.7 million and $10.2 million , respectively. We are required to record a liability for firm, non-cancelable and unconditional purchase commitments with contract manufacturers and suppliers for quantities in excess of our future demand forecasts. As of March 31, 2017 , we have not accrued any significant costs for such non-cancelable commitments. Purchase Obligations As of March 31, 2017 , we had approximately $22.5 million of non-cancelable firm purchase commitments primarily for purchases of software and services. In those situations in which we have received delivery of the goods or services as of March 31, 2017 under purchase orders outstanding as of the same date, such amounts are reflected in the condensed consolidated balance sheet as accounts payable or accrued liabilities, and are excluded from the $22.5 million . Litigation We accrue for contingencies when we believe that a loss is probable and that we can reasonably estimate the amount of any such loss. We have made an assessment of the probability of incurring any such losses and whether or not those losses are estimable. On June 20, 2014, a purported stockholder class action lawsuit was filed in the Superior Court of California, County of Santa Clara, against the Company, current and former members of our Board of Directors, current and former officers, and the underwriters of our March 2014 follow-on public offering. On July 17, 2014, a substantially similar lawsuit was filed in the same court against the same defendants. The actions were consolidated and, on March 4, 2015, an amended complaint was filed, alleging violations of the federal securities laws on behalf of a purported class consisting of purchasers of the Company's common stock pursuant or traceable to the registration statement and prospectus for the follow-on public offering, and seeking unspecified compensatory damages and other relief. On April 20, 2015, defendants filed demurrers seeking that the amended complaint be dismissed. On August 11, 2015, the court overruled defendants' demurrers. On November 16, 2015, plaintiffs filed a motion seeking certification of the putative class, which the court granted in part and denied in part on July 11, 2016. On January 6, 2016, the Company and the individual defendants filed a motion for judgment on the pleadings seeking that the action be dismissed for lack of subject-matter jurisdiction, which the court denied on April 1, 2016. On May 19, 2016, the Company and the individual defendants filed a petition for a writ of mandate seeking the overturning of the court's denial of the motion for judgment on the pleadings. On September 8, 2016, the court of appeal denied the petition. On September 16, 2016, the Company and the individual defendants filed a petition for review with the Supreme Court of California. On November 9, 2016, the Supreme Court of California denied the petition for review. On December 8, 2016, the Company and the individual defendants filed a petition for a writ of certiorari before the United States Supreme Court. On February 6, 2017, the parties submitted to the Superior Court a stipulation of settlement. The terms of the settlement include a release and dismissal of all claims against all defendants without any liability or wrongdoing attributed to them. On February 7, 2017, plaintiffs filed an unopposed motion for preliminary approval of the settlement, which the Superior Court granted. The settlement, which is immaterial to the Company's consolidated financial statements, is subject to stockholder notice, court approval, and other customary conditions. On January 28, 2015, certain of the Company’s officers and directors were named as defendants in a putative derivative action filed in the Superior Court of California, County of Santa Clara. On April 21, 2015, a substantially similar lawsuit was filed in the same court against the same defendants. The Company is named as a nominal defendant in both actions. The actions were consolidated and a consolidated complaint was filed on June 15, 2015, purporting to allege claims for breach of fiduciary duty and unjust enrichment. On July 15, 2015, defendants filed demurrers to the consolidated complaint. On December 4, 2015, the court sustained, with leave to amend, defendants’ demurrers on the basis that plaintiffs had failed adequately to allege derivative standing. Plaintiffs filed an amended complaint on May 3, 2016. On June 8, 2016, defendants filed demurrers to the amended complaint, which the court sustained on August 29, 2016, dismissing the case with prejudice. Plaintiffs filed a notice of appeal on October 27, 2016. Based on information currently available, the Company has determined that the amount of any possible loss or range of possible loss is not reasonably estimable. In February 2016, a lawsuit was filed in the Superior Court of California, County of Santa Clara, by one of the plaintiffs in the aforementioned putative derivative action against the Company, seeking production of certain books and records pursuant to Delaware and California law. On May 16, 2016, the court sustained the Company's demurrer to the petition, without leave to amend. Plaintiff filed a notice of appeal on October 27, 2016. The appeal was dismissed on April 14, 2017. We are also subject to legal proceedings, claims and litigation, including intellectual property litigation, arising in the ordinary course of business. Such matters are subject to many uncertainties and outcomes, and are not predictable with assurance. To the extent there is a reasonable possibility that a loss exceeding amounts already recognized may be incurred, and the amount of such additional loss would be material, we will either disclose the estimated additional loss or state that such an estimate cannot be made. We do not currently believe that it is reasonably possible that additional losses in connection with litigation arising in the ordinary course of business would be material. Indemnification Under the indemnification provisions of our standard sales related contracts, we agree to defend our customers against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments entered on such claims. Our exposure under these indemnification provisions is generally limited to the total amount paid by our customer under the agreement. However, certain agreements include indemnification provisions that could potentially expose us to losses in excess of the amount received under the agreement. In addition, we indemnify our officers, directors, and certain key employees for actions taken while they are or were serving in good faith in such capacities. Through March 31, 2017 , there have been no claims under any indemnification provisions.

Common Shares Reserved for Issu

Common Shares Reserved for Issuance	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Common Shares Reserved for Issuance	Common Shares Reserved for Issuance We have 100,000,000 shares of convertible preferred stock with a par value of $0.0001 per share authorized, none of which were issued and outstanding as of March 31, 2017 or December 31, 2016 . Under our amended and restated certificate of incorporation, we are authorized to issue 1,000,000,000 shares of common stock with a par value of $0.0001 per share as of March 31, 2017 and December 31, 2016 . Each share of common stock outstanding is entitled to one vote. The holders of common stock are also entitled to receive dividends whenever funds are legally available and when declared by our Board of Directors, subject to the prior rights of holders of all classes of convertible preferred stock outstanding. We had reserved shares of common stock for issuance as follows (in thousands): As of March 31, 2017 As of December 31, 2016 Reserved under stock award plans 43,435 38,005 Convertible Senior Notes 15,141 15,141 ESPP 4,597 2,851 Total 63,173 55,997

Equity Award Plans

Equity Award Plans	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Award Plans	Equity Award Plans We have operated under our 2013 Equity Incentive Plan ("2013 Plan") since our initial public offering ("IPO") in September 2013. Our 2013 Plan provides for the issuance of restricted stock and the granting of options, stock appreciation rights, performance shares, performance units and restricted stock units to our employees, officers, directors and consultants. Our 2013 Plan provides for annual increases in the number of shares available for issuance on the first day of each fiscal year. Awards granted under the 2013 Plan vest over the periods determined by our Board of Directors or compensation committee of our Board of Directors, generally four years, and stock options granted under the 2013 Plan expire no more than ten years after the date of grant. In the case of an incentive stock option granted to an employee who at the time of grant owns stock representing more than 10% of the total combined voting power of all classes of stock, the exercise price shall be no less than 110% of the fair value per share on the date of grant, and the award shall expire five years from the date of grant. For options granted to any other employee, the per share exercise price shall be no less than 100% of the fair value per share on the date of grant. In the case of non-statutory stock options and options granted to consultants, the per share exercise price shall be no less than 100% of the fair value per share on the date of grant. Stock that is purchased prior to vesting is subject to our right of repurchase at any time following termination of the participant's service for so long as such stock remains unvested. Approximately 11.4 million shares and 10.0 million shares of our common stock were reserved for future grants as of March 31, 2017 and December 31, 2016 , respectively, under the 2013 Plan . Our 2013 Employee Stock Purchase Plan ("ESPP") allows eligible employees to acquire shares of our common stock at 85% of the lower of the fair market value of our common stock on the first trading day of each offering period or on the exercise date. Our ESPP provides for annual increases in the number of shares available for issuance on the first day of each fiscal year. An aggregate of approximately 4.6 million shares and 2.9 million shares of common stock were available for future issuance as of March 31, 2017 and December 31, 2016 , respectively, under our ESPP. From time to time, we also grant restricted common stock or restricted stock awards outside of our equity incentive plans to certain employees in connection with acquisitions. Stock Option Activity A summary of the activity for our stock option changes during the reporting period and a summary of information related to options vested and options exercisable are presented below (in thousands, except per share amounts and contractual life years): Options Outstanding Number of Shares Weighted- Average Exercise Price Weighted- Average Grant Date Fair Value (per share) Weighted- Aggregate Intrinsic Value Balance — December 31, 2016 8,085 $ 10.7 5.4 $ 40,304 Exercised (906 ) 4.76 6,645 Cancelled (160 ) 29.74 Balance — March 31, 2017 7,019 $ 11.04 5.2 $ 37,567 Options exercisable — March 31, 2017 6,647 $ 10.30 5.1 $ 37,136 Restricted Stock Award (RSA) and Restricted Stock Unit (RSU) Activity A summary of the activity for our restricted common stock, RSAs and RSUs, including those subject to performance conditions, during the reporting period and a summary of information related to unvested restricted common stock, RSAs and RSUs, including those expected to vest based on the achievement of a performance condition, are presented below (in thousands, except per share amounts and contractual life years): Number of Weighted- Weighted- Aggregate Unvested balance — December 31, 2016 19,883 $ 22.23 1.5 $ 236,605 Granted 9,674 11.53 Vested (2,341 ) 24.16 Cancelled (2,233 ) 16.04 Unvested balance — March 31, 2017 24,983 $ 17.80 1.7 $ 315,029 Unvested awards for which the requisite service period has not been rendered and vesting is subject to the achievement of a performance condition — March 31, 2017 4,694 $ 14.66 2.2 $ 59,192 Stock-Based Compensation We record stock-based compensation based on the fair value as determined on the date granted. We determine the fair value of stock options and shares of common stock to be issued under the ESPP using the Black-Scholes option-pricing model. The fair value of restricted stock units and restricted stock awards equals the market value of the underlying stock on the date of grant. We grant performance-based restricted stock units and restricted stock awards to certain employees which vest upon the achievement of certain performance conditions, subject to the employees’ continued service relationship with us. We assess the probability of vesting at each reporting period and adjust our compensation cost based on this probability assessment. We recognize such compensation expense on a straight-line basis over the service provider’s requisite service period. Stock-based compensation expense related to stock options, ESPP and restricted stock units and awards is included in the condensed consolidated statements of operations as follows (in thousands): Three Months Ended March 31, 2017 2016 Cost of product revenue $ 535 $ 667 Cost of subscription and services revenue 7,497 9,601 Research and development 14,525 24,430 Sales and marketing 14,015 16,154 General and administrative 7,317 13,215 Total $ 43,889 $ 64,067 As of March 31, 2017 , total compensation cost related to stock-based awards not yet recognized was $349.0 million , which is expected to be amortized on a straight-line basis over the weighted-average remaining vesting period of approximately 2.5 years .

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We account for income taxes under the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to be reversed. We recognized a provision for income taxes of $1.3 million for the three months ended March 31, 2017 , and a benefit from income taxes of $10.0 million during the three months ended March 31, 2016 . The tax provision during the three months ended March 31, 2017 is primarily due to foreign and state income taxes. The tax benefit during the three months ended March 31, 2016 is primarily due to the reversal of the U.S. valuation allowances as a result of recording a similar amount of acquisition related U.S. deferred tax liabilities, which are considered a source of future taxable income available to realize the benefit of U.S. deferred tax assets.

Net Loss per Share

Net Loss per Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Net Loss per Share	Net Loss per Share Basic net loss per share is calculated by dividing net loss by the weighted average number of common shares outstanding during the period, less shares subject to repurchase, and excludes any dilutive effects of employee share based awards and warrants. Diluted net income per common share is computed giving effect to all potentially dilutive common shares, including common stock issuable upon exercise of stock options, conversion of the Convertible Senior Notes, and unvested restricted common stock and stock units. As we had net losses for the three months ended March 31, 2017 and 2016 , all potential common shares were determined to be anti-dilutive. The following table sets forth the computation of net loss per common share (in thousands, except per share amounts): Three Months Ended March 31, 2017 2016 Numerator: Net loss $ (82,988 ) $ (155,900 ) Denominator: Weighted average number of shares outstanding—basic and diluted 172,236 158,781 Net loss per share—basic and diluted $ (0.48 ) $ (0.98 ) The following outstanding options and unvested shares were excluded (as common stock equivalents) from the computation of diluted net loss per common share for the periods presented as their effect would have been anti-dilutive (in thousands): As of March 31, 2017 2016 Options to purchase common stock 7,019 10,627 Unvested early exercised common shares — 647 Unvested restricted stock awards and units 24,983 23,896 Convertible senior notes 15,141 15,141 ESPP shares 784 667

Employee Benefit Plan

Employee Benefit Plan	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plan	Employee Benefit Plan 401(k) Plan We have established a 401(k) tax-deferred savings plan (the “401(k) Plan”) which permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code of 1986, as amended. All participants’ interests in their deferrals are 100% vested when contributed. We are responsible for administrative costs of the 401(k) Plan and have made no matching contributions into our 401(k) Plan since inception. Under the 401(k) Plan, pre-tax contributions are allocated to each participant’s individual account and are then invested in selected investment alternatives according to the participants’ directions. The 401(k) Plan is intended to qualify under Sections 401(a) and 501(a) of the Code. As a tax-qualified retirement plan, contributions to the 401(k) Plan and earnings on those contributions are not taxable to the employees until distributed, and all contributions are deductible by us when and if made.

Segment and Major Customers Inf

Segment and Major Customers Information	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Segment and Major Customers Information	Segment and Major Customers Information We conduct business globally and are primarily managed on a geographic basis. Our Chief Executive Officer, who is our chief operating decision maker, reviews financial information presented on a consolidated basis accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. There are no segment managers who are held accountable for operations, operating results, and plans for levels, components, or types of products or services below the consolidated unit level. Accordingly, we are considered to be in a single reportable segment and operating unit structure. Revenue by geographic region based on the billing address is as follows (in thousands): Three Months Ended March 31, 2017 2016 Revenue: United States $ 115,004 $ 115,852 EMEA 25,321 24,442 APAC 25,853 21,823 Other 7,560 5,849 Total revenue $ 173,738 $ 167,966 Long lived assets by geographic region based on physical location is as follows (in thousands): As of March 31, 2017 As of December 31, 2016 Property and Equipment, net: United States $ 43,800 $ 43,214 International 17,014 18,638 Total property and equipment, net $ 60,814 $ 61,852 For the three months ended March 31, 2017 and 2016 , one distributor represented 19% and 17% , respectively, and one reseller represented 12% and 11% , respectively, of the Company's total revenue. As of March 31, 2017 and December 31, 2016 , no customer represented 10% or more of the Company's net accounts receivable balance.

Description of Business and S22

Description of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Consolidation	The accompanying unaudited condensed consolidated financial statements include the accounts of FireEye, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”), and following the requirements of the Securities and Exchange Commission (“SEC”), for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. GAAP can be condensed or omitted. These unaudited condensed consolidated financial statements have been prepared on the same basis as our annual consolidated financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, that are necessary for a fair statement of our financial information. The results of operations for the three months ended March 31, 2017 are not necessarily indicative of the results to be expected for the year ending December 31, 2017 or for any other interim period or for any other future year. The balance sheet as of December 31, 2016 has been derived from audited consolidated financial statements at that date but does not include all of the information required by U.S. GAAP for annual consolidated financial statements. The accompanying unaudited condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended December 31, 2016 included in our Annual Report on Form 10-K, which was filed with the SEC on February 24, 2017 .
Use of Estimates	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Such management estimates include, but are not limited to, the best estimate of selling price for our products, subscriptions and services, commissions expense, bonus expense, future taxable income, contract manufacturer liabilities, litigation and settlement costs and other loss contingencies, fair value of our equity awards, achievement of targets for performance stock units, fair value of the liability and equity components of convertible senior notes and the purchase price allocation of acquired businesses. We base our estimates on historical experience and also on assumptions that we believe are reasonable. Changes in facts or circumstances may cause us to change our assumptions and estimates in future periods, and it is possible that actual results could differ from current or revised future estimates.
Recent Accounting Pronouncements	In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This standard eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge (i.e. Step 2 of the current guidance), instead measuring the impairment charge as the excess of the reporting unit's carrying amount over its fair value (i.e. Step 1 of the current guidance). The guidance is effective for us beginning in the first quarter of 2020, and should be applied prospectively. Early adoption is permitted for impairment testing dates after January 1, 2017. The adoption of this standard is not expected to have a significant impact on our consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. This standard changes the definition of a business by requiring at least one substantive process. It also states that if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, then the set of transferred assets and activities is not a business. The guidance is effective for us beginning in the first quarter of 2018, and should be applied prospectively. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This standard changes the impairment model for most financial assets and certain other instruments by introducing a current expected credit loss (CECL) model. The CECL model is a more forward-looking approach based on expected losses rather than incurred losses, requiring entities to estimate and record losses expected over the remaining contractual life of an asset. The guidance is effective for us beginning in the first quarter of 2020. Early adoption beginning in 2019 is permitted. We are currently evaluating the impact the adoption of this guidance will have on our consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This standard is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The guidance is effective for us beginning in the first quarter of 2019, and should be applied on a modified retrospective basis. Early adoption is permitted. We expect the adoption of this standard to have a material impact on our consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This standard provides a single model for revenue arising from contracts with customers and supersedes current revenue recognition guidance. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In July 2015, the FASB decided to defer the effective date by one year, and as a result, the guidance is effective for us beginning in the first quarter of 2018. Early adoption as of the original effective date would be permitted. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment. The FASB subsequently issued several clarifying standards to address stakeholder questions and implementation issues. We currently anticipate adopting the standard retrospectively to all prior periods presented. Our ability to apply the requirements retrospectively to all prior periods presented is dependent on system readiness, including software procured from third-party providers, and the completion of our analysis of information necessary to restate prior period financial statements. We anticipate this standard will have a material impact on our consolidated financial statements and related disclosures. While we are continuing to assess all the potential impacts this standard will have, and as such we do not know or cannot reasonably estimate quantitative information related to the impact of this standard on our consolidated financial statements at this time, we currently believe the most significant impact relates to our accounting for intelligence dependent appliance and software license revenue. We expect revenue related to certain appliances and software licenses not dependent on intelligence, subscription and support offerings, cloud offerings and professional services to remain substantially unchanged. Specifically, under the new standard we expect to combine intelligence dependent appliances and software licenses with the related intelligence subscription and support as a single performance obligation. As a result, we expect to recognize intelligence dependent appliance and software license revenue ratably over the life of the related device or license, rather than at the time of shipping, when our contracts contain material right of renewal options. Where our contracts do not contain material right of renewal options, we expect to recognize intelligence dependent appliance and software license revenue ratably over the contractual term. Due to complexity of certain of our customer contracts, the actual revenue recognition treatment required under the standard will be dependent on contract-specific terms, and may vary in some instance from the recognition models noted above. We currently believe appliance and software license revenue will be recognized predominantly over the useful life of the device or license as most of our appliance and license offerings are intelligence dependent. Additionally, we currently expect commissions expense to be deferred at the time of sale, and recognized ratably over the life of the related device or license or over the contractual term, rather than expensing commissions predominantly at the time of sale.
Fair Value Measurements	The accounting guidance for fair value measurements provides a framework for measuring fair value on either a recurring or nonrecurring basis, whereby the inputs used in our valuation techniques are assigned a hierarchical level. The following are the three levels of inputs to measure fair value: • Level 1: Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2: Inputs that reflect quoted prices for identical assets or liabilities in less active markets; quoted prices for similar assets or liabilities in active markets; benchmark yields, reported trades, broker/dealer quotes, inputs other than quoted prices that are observable for the assets or liabilities; or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3: Unobservable inputs that reflect our own assumptions incorporated in valuation techniques used to measure fair value. These assumptions are required to be consistent with market participant assumptions that are reasonably available. We consider an active market to be one in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis, and consider an inactive market to be one in which there are infrequent or few transactions for the asset or liability, the prices are not current, or price quotations vary substantially either over time or among market makers. Where appropriate, our own or the counterparty’s non-performance risk is considered in measuring the fair values of assets.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Assets Measured at Fair Value on a Recurring Basis	The following table presents our assets and liabilities measured at fair value on a recurring basis using the above input categories (in thousands): As of March 31, 2017 As of December 31, 2016 Description Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents: Money market funds $ 2,896 $ — $ — $ 2,896 $ 449 $ — $ — $ 449 Total cash equivalents 2,896 — — 2,896 449 — — 449 Short-term investments: Certificates of deposit — 7,886 — 7,886 — 9,569 — 9,569 Commercial paper — 14,981 — 14,981 — 29,920 — 29,920 Corporate notes and bonds — 433,491 — 433,491 — 420,684 — 420,684 U.S. Government agencies — 255,279 — 255,279 — 251,885 — 251,885 Total short-term investments — 711,637 — 711,637 — 712,058 — 712,058 Total assets measured at fair value $ 2,896 $ 711,637 $ — $ 714,533 $ 449 $ 712,058 $ — $ 712,507 Liabilities Contingent earn-out $ — $ — $ 67 $ 67 $ — $ — $ 41,332 $ 41,332 Total liabilities measured at fair value $ — $ — $ 67 $ 67 $ — $ — $ 41,332 $ 41,332
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following is a reconciliation of the Level 3 contingent earn-out liability (in thousands): Amount Balance as of December 31, 2016 $ 41,332 Changes in fair value (1) 13 Cash payments (41,278 ) Balance as of March 31, 2017 $ 67 (1) Changes in fair value are recorded in general and administrative expenses in our condensed consolidated statements of operations.

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of Investments	Our investments consisted of the following (in thousands): As of March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-Term Investment Certificates of deposit $ 7,880 $ 7 $ (1 ) $ 7,886 $ 7,886 Commercial paper 14,984 — (3 ) 14,981 14,981 Corporate notes and bonds 434,274 17 (800 ) 433,491 433,491 U.S. Government agencies 255,918 — (639 ) 255,279 255,279 Total $ 713,056 $ 24 $ (1,443 ) $ 711,637 $ 711,637 As of December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Short-Term Investment Certificates of deposit $ 9,560 $ 10 $ (1 ) $ 9,569 $ 9,569 Commercial paper 29,929 — (9 ) 29,920 29,920 Corporate notes and bonds 421,635 17 (968 ) 420,684 420,684 U.S. Government agencies 252,676 2 (793 ) 251,885 251,885 Total $ 713,800 $ 29 $ (1,771 ) $ 712,058 $ 712,058
Summary of Gross Unrealized Losses and Fair Value of Investments in a Continuous Unrealized Loss Position	The following tables present the gross unrealized losses and related fair values of our investments that have been in a continuous unrealized loss position (in thousands): As of March 31, 2017 Less Than 12 Months Greater Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Certificates of deposit $ — $ — $ 199 $ (1 ) $ 199 $ (1 ) Commercial paper 14,981 (3 ) — — 14,981 (3 ) Corporate notes and bonds 343,313 (761 ) 64,470 (39 ) 407,783 (800 ) U.S. Government agencies 233,786 (625 ) 14,994 (14 ) 248,780 (639 ) Total $ 592,080 $ (1,389 ) $ 79,663 $ (54 ) $ 671,743 $ (1,443 ) As of December 31, 2016 Less Than 12 Months Greater Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Certificates of deposit $ — $ — $ 199 $ (1 ) $ 199 $ (1 ) Commercial paper 24,925 (9 ) — — 24,925 (9 ) Corporate notes and bonds 294,818 (889 ) 99,433 (79 ) 394,251 (968 ) U.S. Government agencies 222,171 (763 ) 17,657 (30 ) 239,828 (793 ) Total $ 541,914 $ (1,661 ) $ 117,289 $ (110 ) $ 659,203 $ (1,771 )
Summary of Contractual Maturities of Investments	The following table summarizes the contractual maturities of our investments at March 31, 2017 (in thousands): Amortized Cost Fair Value Due within one year $ 382,128 $ 381,674 Due within one to two years 330,928 329,963 Total $ 713,056 $ 711,637

Property and Equipment (Tables)

Property and Equipment (Tables)	3 Months Ended
	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment, net consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Computer equipment and software $ 151,258 $ 144,892 Leasehold improvements 44,003 41,796 Furniture and fixtures 15,057 14,499 Machinery and equipment 447 447 Total property and equipment 210,765 201,634 Less: accumulated depreciation (149,951 ) (139,782 ) Total property and equipment, net $ 60,814 $ 61,852

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2017
Business Acquisition [Line Items]
Schedule of Goodwill	There were no changes in the carrying amount of goodwill for the three months ended March 31, 2017 .
Schedule of Purchased Intangible Assets	Purchased intangible assets consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Developed technology $ 102,593 $ 102,593 Content 158,700 158,700 Customer relationships 109,800 109,800 Contract backlog 12,500 12,500 Trade names 15,500 15,500 Non-competition agreements 1,400 1,400 Total intangible assets 400,493 400,493 Less: accumulated amortization (171,248 ) (156,461 ) Total net intangible assets $ 229,245 $ 244,032
Schedule of Expected Annual Amortization Expense of Intangible Assets	The expected future annual amortization expense of intangible assets as of March 31, 2017 is presented below (in thousands): Years Ending December 31, Amount 2017 (remaining nine mon ths) $ 44,331 2018 47,433 2019 45,547 2020 31,171 2021 29,282 2022 and thereafter 31,481 Total $ 229,245
iSIGHT Security
Business Acquisition [Line Items]
Schedule of Purchase Price Allocation	Allocation of the purchase price of $261.8 million is as follows (in thousands): Amount Net tangible liabilities assumed $ (18,248 ) Intangible assets 85,100 Deferred tax liability (11,637 ) Goodwill 206,623 Total purchase price allocation $ 261,838
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]	The estimated useful life and fair values of the identifiable intangible assets are as follows (in thousands): Estimated Useful Life (in years) Amount Customer relationships 7 $ 33,700 Content 4 30,100 Developed technology 4-6 17,100 Trade name 5 3,100 Non-competition agreements 2 1,100 Total identifiable intangible assets $ 85,100
Invotas International Corporation
Business Acquisition [Line Items]
Schedule of Purchase Price Allocation	Allocation of the purchase price is as follows (in thousands): Amount Net tangible liabilities assumed $ (306 ) Intangible assets 8,400 Deferred tax liability (688 ) Goodwill 21,349 Total purchase price allocation $ 28,755
Schedule of Estimated Useful Life and Fair Values of the Identifiable Intangible Assets	The estimated useful life and fair values of the identifiable intangible assets are as follows (in thousands): Estimated Useful Life (in years) Amount Developed technology 4 $ 4,500 In-process research and development N/A 2,800 Customer relationships 10 800 Non-competition agreements 3 300 Total identifiable intangible assets $ 8,400

Restructuring Charges (Tables)

Restructuring Charges (Tables)	3 Months Ended
	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Summary of Restructuring Activities	The following table sets forth a summary of restructuring activities during the three months ended March 31, 2017 (in thousands): Severance and related costs Facilities costs Total costs Balance, December 31, 2016 $ 1,221 $ 2,246 $ 3,467 Cash payments (686 ) (289 ) (975 ) Other adjustments (380 ) (59 ) (439 ) Balance, March 31, 2017 $ 155 $ 1,898 $ 2,053

Deferred Revenue (Tables)

Deferred Revenue (Tables)	3 Months Ended
	Mar. 31, 2017
Revenue Recognition [Abstract]
Schedule of Deferred Revenue	Deferred revenue consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Product, current $ 9,245 $ 8,924 Subscription and services, current 387,383 388,194 Total deferred revenue, current 396,628 397,118 Product, non-current 4,059 4,748 Subscription and services, non-current 231,498 251,650 Total deferred revenue, non-current 235,557 256,398 Total deferred revenue $ 632,185 $ 653,516

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Schedule of the Liability and Equity Components of the Convertible Senior Notes	The liability and equity components of the Convertible Senior Notes consisted of the following (in thousands): As of March 31, 2017 As of December 31, 2016 Series A Notes Series B Notes Series A Notes Series B Notes Liability component: Principal $ 460,000 $ 460,000 $ 460,000 $ 460,000 Less: Convertible senior notes discounts and issuance costs, net of amortization (69,132 ) (99,662 ) (74,126 ) (103,894 ) Net carrying amount $ 390,868 $ 360,338 $ 385,874 $ 356,106 Equity component, net of issuance costs $ 92,567 $ 117,834 $ 92,567 $ 117,834
Schedule of Interest Expense related to the Convertible Senior Notes	Interest expense for the three months ended March 31, 2017 related to the Convertible Senior Notes consisted of the following (in thousands): Three Months Ended March 31, 2017 Series A Notes Series B Notes Coupon interest $ 1,150 $ 1,869 Amortization of convertible senior notes discounts and issuance costs 4,993 4,232 Total interest expense recognized $ 6,143 $ 6,101 Effective interest rate on the liability component 6.4 % 6.9 % Interest expense for the three months ended March 31, 2016 related to the Convertible Senior Notes consisted of the following (in thousands): Three Months Ended March 31, 2016 Series A Notes Series B Notes Coupon interest $ 1,150 $ 1,869 Amortization of convertible senior notes discounts and issuance costs 4,743 4,037 Total interest expense recognized $ 5,893 $ 5,906 Effective interest rate on the liability component 6.4 % 7.0 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Non-cancelable Minimum Rental Payments for Operating Leases	The aggregate future non-cancelable minimum rental payments on our operating leases, as of March 31, 2017 , are as follows (in thousands): Years Ending December 31, Amount 2017 (remaining nine months) $ 11,822 2018 16,553 2019 12,915 2020 12,787 2021 10,992 2022 and thereafter 39,276 Total $ 104,345

Common Shares Reserved for Is31

Common Shares Reserved for Issuance (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Schedule of Reserved Shares of Common Stock for Issuance	We had reserved shares of common stock for issuance as follows (in thousands): As of March 31, 2017 As of December 31, 2016 Reserved under stock award plans 43,435 38,005 Convertible Senior Notes 15,141 15,141 ESPP 4,597 2,851 Total 63,173 55,997

Equity Award Plans (Tables)

Equity Award Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of the Activity for Stock Option Changes and Summary of Information Related to Options Vested and Expected to Vest and Options Exercisable	A summary of the activity for our stock option changes during the reporting period and a summary of information related to options vested and options exercisable are presented below (in thousands, except per share amounts and contractual life years): Options Outstanding Number of Shares Weighted- Average Exercise Price Weighted- Average Grant Date Fair Value (per share) Weighted- Aggregate Intrinsic Value Balance — December 31, 2016 8,085 $ 10.7 5.4 $ 40,304 Exercised (906 ) 4.76 6,645 Cancelled (160 ) 29.74 Balance — March 31, 2017 7,019 $ 11.04 5.2 $ 37,567 Options exercisable — March 31, 2017 6,647 $ 10.30 5.1 $ 37,136
Summary of Activity for Restricted Common Stock, RSAs and RSUs and Summary of Information Related to Unvested Restricted Common Stock, RSAs and RSUs and those Expected to Vest	A summary of the activity for our restricted common stock, RSAs and RSUs, including those subject to performance conditions, during the reporting period and a summary of information related to unvested restricted common stock, RSAs and RSUs, including those expected to vest based on the achievement of a performance condition, are presented below (in thousands, except per share amounts and contractual life years): Number of Weighted- Weighted- Aggregate Unvested balance — December 31, 2016 19,883 $ 22.23 1.5 $ 236,605 Granted 9,674 11.53 Vested (2,341 ) 24.16 Cancelled (2,233 ) 16.04 Unvested balance — March 31, 2017 24,983 $ 17.80 1.7 $ 315,029 Unvested awards for which the requisite service period has not been rendered and vesting is subject to the achievement of a performance condition — March 31, 2017 4,694 $ 14.66 2.2 $ 59,192
Schedule of Stock-Based Compensation Expense Related to Stock Options, ESPP and Restricted Stock Units and Awards	Stock-based compensation expense related to stock options, ESPP and restricted stock units and awards is included in the condensed consolidated statements of operations as follows (in thousands): Three Months Ended March 31, 2017 2016 Cost of product revenue $ 535 $ 667 Cost of subscription and services revenue 7,497 9,601 Research and development 14,525 24,430 Sales and marketing 14,015 16,154 General and administrative 7,317 13,215 Total $ 43,889 $ 64,067

Net Loss per Share (Tables)

Net Loss per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Schedule of Computation of Net Loss per Common Share	The following table sets forth the computation of net loss per common share (in thousands, except per share amounts): Three Months Ended March 31, 2017 2016 Numerator: Net loss $ (82,988 ) $ (155,900 ) Denominator: Weighted average number of shares outstanding—basic and diluted 172,236 158,781 Net loss per share—basic and diluted $ (0.48 ) $ (0.98 )
Schedule of Outstanding Options and Unvested Shares Excluded from Computation of Diluted Net Loss per Share	The following outstanding options and unvested shares were excluded (as common stock equivalents) from the computation of diluted net loss per common share for the periods presented as their effect would have been anti-dilutive (in thousands): As of March 31, 2017 2016 Options to purchase common stock 7,019 10,627 Unvested early exercised common shares — 647 Unvested restricted stock awards and units 24,983 23,896 Convertible senior notes 15,141 15,141 ESPP shares 784 667

Segment and Major Customers I34

Segment and Major Customers Information (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Region	Revenue by geographic region based on the billing address is as follows (in thousands): Three Months Ended March 31, 2017 2016 Revenue: United States $ 115,004 $ 115,852 EMEA 25,321 24,442 APAC 25,853 21,823 Other 7,560 5,849 Total revenue $ 173,738 $ 167,966
Summary of Long lived Assets by Geographic Region Based on Physical Location	Long lived assets by geographic region based on physical location is as follows (in thousands): As of March 31, 2017 As of December 31, 2016 Property and Equipment, net: United States $ 43,800 $ 43,214 International 17,014 18,638 Total property and equipment, net $ 60,814 $ 61,852

Description of Business and S35

Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Feb. 01, 2016	Jan. 14, 2016	Feb. 28, 2017	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Consideration transferred, equity interests				$ 0	$ 39,300
Liabilities incurred				$ 0	$ 35,588
Invotas International Corporation
Business Acquisition [Line Items]
Purchase consideration, cash paid	$ 17,700
Invotas International Corporation | Common Stock
Business Acquisition [Line Items]
Equity interest issuable (in shares)	742,026
Consideration transferred, equity interests	$ 11,100
iSIGHT Security
Business Acquisition [Line Items]
Purchase consideration, cash paid		$ 192,800
Liabilities incurred		$ 39,100
iSIGHT Security | Common Stock
Business Acquisition [Line Items]
Equity interest issuable (in shares)		1,793,305	1,793,297
Consideration transferred, equity interests		$ 29,900

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	$ 2,896	$ 449
Total short-term investments	711,637	712,058
Total assets measured at fair value	714,533	712,507
Contingent earn-out	67	41,332
Total liabilities measured at fair value	67	41,332
Fair value | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	7,886	9,569
Fair value | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	14,981	29,920
Fair value | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	433,491	420,684
Fair value | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	255,279	251,885
Fair value | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	2,896	449
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	2,896	449
Total short-term investments	0	0
Total assets measured at fair value	2,896	449
Contingent earn-out	0	0
Total liabilities measured at fair value	0	0
Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 1 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 1 | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	2,896	449
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0	0
Total short-term investments	711,637	712,058
Total assets measured at fair value	711,637	712,058
Contingent earn-out	0	0
Total liabilities measured at fair value	0	0
Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	7,886	9,569
Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	14,981	29,920
Level 2 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	433,491	420,684
Level 2 | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	255,279	251,885
Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	0	0
Total short-term investments	0	0
Total assets measured at fair value	0	0
Contingent earn-out	67	41,332
Total liabilities measured at fair value	67	41,332
Level 3 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 3 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 3 | Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 3 | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total short-term investments	0	0
Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash equivalents	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2017
Level 2 | Convertible Senior Notes
Debt Instrument [Line Items]
Fair value of debt		$ 843.5
iSIGHT Security | Level 3
Debt Instrument [Line Items]
Earn-out period of performance	2 years 6 months
iSIGHT Security | Level 3 | Minimum
Debt Instrument [Line Items]
Expected quarterly revenue growth rates	63.00%
Discount rate	6.30%
iSIGHT Security | Level 3 | Maximum
Debt Instrument [Line Items]
Discount rate	7.10%
iSIGHT Security | Level 3 | Weighted Average
Debt Instrument [Line Items]
Expected volatility	16.50%
Quarterly revenue growth compared to S&P 500 Index	44.70%

Fair Value Measurements - Sch38

Fair Value Measurements - Schedule of Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in fair value	$ 13	$ 0
Cash payments	(38,928)	$ 0
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	41,332
Changes in fair value	13
Cash payments	(41,278)
Ending balance	$ 67

Investments - Summary of Invest

Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalent	$ 163,374	$ 223,667	$ 175,113	$ 402,102
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	713,056	713,800
Gross Unrealized Gains	24	29
Gross Unrealized Losses	(1,443)	(1,771)
Estimated Fair Value	711,637	712,058
Short-Term Investment	711,637	712,058
Short-term investments | Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,880	9,560
Gross Unrealized Gains	7	10
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	7,886	9,569
Short-Term Investment	7,886	9,569
Short-term investments | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,984	29,929
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(9)
Estimated Fair Value	14,981	29,920
Short-Term Investment	14,981	29,920
Short-term investments | Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	434,274	421,635
Gross Unrealized Gains	17	17
Gross Unrealized Losses	(800)	(968)
Estimated Fair Value	433,491	420,684
Short-Term Investment	433,491	420,684
Short-term investments | U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	255,918	252,676
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(639)	(793)
Estimated Fair Value	255,279	251,885
Short-Term Investment	$ 255,279	$ 251,885

Investments - Summary of Gross

Investments - Summary of Gross Unrealized Losses and Fair Value of Investments in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	$ 592,080	$ 541,914
Unrealized Loss, Less Than 12 Months	(1,389)	(1,661)
Fair Value, Greater Than 12 Months	79,663	117,289
Unrealized Loss, Greater Than 12 Months	(54)	(110)
Fair Value	671,743	659,203
Unrealized Loss	(1,443)	(1,771)
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	0	0
Unrealized Loss, Less Than 12 Months	0	0
Fair Value, Greater Than 12 Months	199	199
Unrealized Loss, Greater Than 12 Months	(1)	(1)
Fair Value	199	199
Unrealized Loss	(1)	(1)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	14,981	24,925
Unrealized Loss, Less Than 12 Months	(3)	(9)
Fair Value, Greater Than 12 Months	0	0
Unrealized Loss, Greater Than 12 Months	0	0
Fair Value	14,981	24,925
Unrealized Loss	(3)	(9)
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	343,313	294,818
Unrealized Loss, Less Than 12 Months	(761)	(889)
Fair Value, Greater Than 12 Months	64,470	99,433
Unrealized Loss, Greater Than 12 Months	(39)	(79)
Fair Value	407,783	394,251
Unrealized Loss	(800)	(968)
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	233,786	222,171
Unrealized Loss, Less Than 12 Months	(625)	(763)
Fair Value, Greater Than 12 Months	14,994	17,657
Unrealized Loss, Greater Than 12 Months	(14)	(30)
Fair Value	248,780	239,828
Unrealized Loss	$ (639)	$ (793)

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Other than temporary impairment	$ 0	$ 0
Ownership percentage	11.90%
Investment, carrying value	$ 600,000	$ 900,000

Investments - Summary of Contra

Investments - Summary of Contractual Maturities of Investments (Details) $ in Thousands	Mar. 31, 2017USD ($)
Investments, Debt and Equity Securities [Abstract]
Due within one year, amortized cost	$ 382,128
Due within one to two years, amortized cost	330,928
Amortized Cost	713,056
Due within one year, fair value	381,674
Due within one to two years, fair value	329,963
Fair Value	$ 711,637

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 210,765	$ 201,634
Less: accumulated depreciation	(149,951)	(139,782)
Total property and equipment, net	60,814	61,852
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	151,258	144,892
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	44,003	41,796
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	15,057	14,499
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 447	$ 447

Property and Equipment - Narrat

Property and Equipment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$ 11	$ 14.1
Capitalized software development costs	4.7	1.9
Amortization of capitalized software development costs	$ 0.8	$ 0.4

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($)	Feb. 01, 2016	Jan. 14, 2016	Feb. 28, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016
Business Acquisition [Line Items]
Contingent earn-out in connection with acquisitions				$ 0		$ 35,588,000
Consideration transferred, equity interests				$ 0		39,300,000
Granted (shares)				9,674,000
Amortization of intangible assets				$ 14,800,000		15,200,000
iSIGHT Security
Business Acquisition [Line Items]
Purchase consideration, cash paid		$ 192,800,000
Contingent earn-out in connection with acquisitions		39,100,000
Total purchase consideration		261,800,000
Contingent earn-out			$ 41,300,000
Changes in fair value of contingent earn-out liability					$ 3,500,000
Increase in purchase price					5,200,000
Increase in amortization of intangible assets					200,000
Liabilities		7,000,000
Goodwill deductible for U.S. federal income tax purposes		0
Business acquisition, pro forma revenue						9,400,000
Business combination, pro forma net loss						$ 2,300,000
iSIGHT Security | General and administrative
Business Acquisition [Line Items]
Acquisition related costs		$ 1,900,000
iSIGHT Security | Customer relationships
Business Acquisition [Line Items]
Change in estimate of intangible assets					1,100,000
Discount rate		15.00%
iSIGHT Security | Content
Business Acquisition [Line Items]
Change in estimate of intangible assets					1,200,000
Discount rate		14.00%
iSIGHT Security | Developed technology
Business Acquisition [Line Items]
Discount rate		14.00%
Royalty percentage		10.00%
iSIGHT Security | Trade name
Business Acquisition [Line Items]
Discount rate		15.00%
Royalty percentage		1.00%
iSIGHT Security | Common Stock
Business Acquisition [Line Items]
Equity interest issuable (in shares)		1,793,305	1,793,297
Consideration transferred, equity interests		$ 29,900,000
Change in fair value of contingent common stock					$ 1,700,000
Invotas International Corporation
Business Acquisition [Line Items]
Purchase consideration, cash paid	$ 17,700,000
Total purchase consideration	28,800,000
Liabilities	700,000
Goodwill deductible for U.S. federal income tax purposes	$ 0
Requisite service period	4 years
Performance milestone determination period	3 years
Invotas International Corporation | In-process research and development
Business Acquisition [Line Items]
Discount rate	17.00%
Invotas International Corporation | General and administrative
Business Acquisition [Line Items]
Acquisition related costs	$ 500,000
Invotas International Corporation | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Granted (shares)	1,002,748
Invotas International Corporation | Developed technology
Business Acquisition [Line Items]
Discount rate	16.00%
Invotas International Corporation | Common Stock
Business Acquisition [Line Items]
Equity interest issuable (in shares)	742,026
Consideration transferred, equity interests	$ 11,100,000
Invotas International Corporation | Unvested Restricted Stock Awards And Restricted Stock Units
Business Acquisition [Line Items]
Granted (shares)	95,614

Business Combinations - Schedul

Business Combinations - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Feb. 01, 2016	Jan. 14, 2016
Business Acquisition [Line Items]
Goodwill	$ 978,260	$ 978,260
iSIGHT Security
Business Acquisition [Line Items]
Net tangible liabilities assumed				$ (18,248)
Intangible assets				85,100
Deferred tax liability				(11,637)
Goodwill				206,623
Total purchase price allocation				$ 261,838
Invotas International Corporation
Business Acquisition [Line Items]
Net tangible liabilities assumed			$ (306)
Intangible assets			8,400
Deferred tax liability			(688)
Goodwill			21,349
Total purchase price allocation			$ 28,755

Business Combinations - Sched47

Business Combinations - Schedule of Estimated Useful Life and Fair Values of the Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Feb. 01, 2016	Jan. 14, 2016
iSIGHT Security
Business Acquisition [Line Items]
Intangible assets		$ 85,100
iSIGHT Security | Customer relationships
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		7 years
Intangible assets		$ 33,700
iSIGHT Security | Content
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		4 years
Intangible assets		$ 30,100
iSIGHT Security | Developed technology
Business Acquisition [Line Items]
Intangible assets		$ 17,100
iSIGHT Security | Developed technology | Minimum
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		4 years
iSIGHT Security | Developed technology | Maximum
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		6 years
iSIGHT Security | Trade name
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		5 years
Intangible assets		$ 3,100
iSIGHT Security | Non-competition agreements
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		2 years
Intangible assets		$ 1,100
Invotas International Corporation
Business Acquisition [Line Items]
Intangible assets	$ 8,400
Invotas International Corporation | In-process research and development
Business Acquisition [Line Items]
Intangible assets	$ 2,800
Invotas International Corporation | Customer relationships
Business Acquisition [Line Items]
Finite lived acquired assets, useful life	10 years
Intangible assets	$ 800
Invotas International Corporation | Developed technology
Business Acquisition [Line Items]
Finite lived acquired assets, useful life	4 years
Intangible assets	$ 4,500
Invotas International Corporation | Non-competition agreements
Business Acquisition [Line Items]
Finite lived acquired assets, useful life	3 years
Intangible assets	$ 300

Business Combinations - Goodwil

Business Combinations - Goodwill and Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Total intangible assets	$ 400,493	$ 400,493
Less: accumulated amortization	(171,248)	(156,461)
Total	229,245	244,032
Developed technology
Business Acquisition [Line Items]
Total intangible assets	102,593	102,593
Content
Business Acquisition [Line Items]
Total intangible assets	158,700	158,700
Customer relationships
Business Acquisition [Line Items]
Total intangible assets	109,800	109,800
Contract backlog
Business Acquisition [Line Items]
Total intangible assets	12,500	12,500
Trade names
Business Acquisition [Line Items]
Total intangible assets	15,500	15,500
Non-competition agreements
Business Acquisition [Line Items]
Total intangible assets	$ 1,400	$ 1,400

Business Combinations - Sched49

Business Combinations - Schedule of Expected Annual Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
2017 (remaining nine months)	$ 44,331
2,018	47,433
2,019	45,547
2,020	31,171
2,021	29,282
2022 and thereafter	31,481
Total	$ 229,245	$ 244,032

Restructuring Charges - Summary

Restructuring Charges - Summary of Restructuring Activities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016	$ 3,467
Cash payments	(975)
Other adjustments	(439)
Balance, March 31, 2017	2,053
Severance and related costs
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016	1,221
Cash payments	(686)
Other adjustments	(380)
Balance, March 31, 2017	155
Facilities costs
Restructuring Reserve [Roll Forward]
Balance, December 31, 2016	2,246
Cash payments	(289)
Other adjustments	(59)
Balance, March 31, 2017	$ 1,898

Restructuring Charges - Narrati

Restructuring Charges - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Percentage reduction in workforce		10.00%
Other adjustments	$ (439)
Restructuring reserve	2,053	$ 3,467
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Other adjustments	(380)
Restructuring reserve	155	1,221
Facilities costs
Restructuring Cost and Reserve [Line Items]
Other adjustments	(59)
Restructuring reserve	$ 1,898	$ 2,246

Deferred Revenue - Schedule of

Deferred Revenue - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	$ 396,628	$ 397,118
Total deferred revenue, non-current	235,557	256,398
Total deferred revenue	632,185	653,516
Product
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	9,245	8,924
Total deferred revenue, non-current	4,059	4,748
Subscription and services
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	387,383	388,194
Total deferred revenue, non-current	$ 231,498	$ 251,650

Convertible Senior Notes - Narr

Convertible Senior Notes - Narrative - Convertible Senior Notes (Details) - Convertible Senior Notes $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2015USD ($)day$ / shares	Mar. 31, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Initial purchaser's discount	$ 23
Debt issuance costs	0.5
Net proceeds from issuance of convertible senior notes	$ 896.5
Shares of common stock (per $1000 principal amount of notes)	16.4572
Conversion price | $ / shares	$ 60.76
Threshold note trading days | day	5
Threshold consecutive note trading days	5 days
Threshold percentage of note price trigger	98.00%
Redemption price, percentage	100.00%
Redemption price triggered by fundamental change, percentage	100.00%
Remaining discount and issuance cost, weighted average amortization period		4 years 4 months 5 days
Subsequent to September 30, 2015
Debt Instrument [Line Items]
Threshold trading days | day	20
Threshold consecutive trading days	30 days
Threshold percentage of stock price trigger	130.00%
Series A Notes
Debt Instrument [Line Items]
Principal amount	$ 460
Interest rate	1.00%
Series B Notes
Debt Instrument [Line Items]
Principal amount	$ 460
Interest rate	1.625%		1.625%
Series B Notes | On or after June 1, 2020 until June 1, 2022
Debt Instrument [Line Items]
Threshold trading days | day	20
Threshold consecutive trading days	30 days
Threshold percentage of stock price trigger	130.00%
Required trading days since notice of redemption, not more than	3 days
Debt, Liability Component
Debt Instrument [Line Items]
Initial purchaser's discount	$ 17.6
Debt issuance costs	0.4
Debt, Equity Component
Debt Instrument [Line Items]
Initial purchaser's discount	5.4
Debt issuance costs	$ 0.1

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of the Liability and Equity Components of the Convertible Senior Notes (Details) - Convertible Senior Notes - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Series A Notes
Debt Instrument [Line Items]
Principal	$ 460,000	$ 460,000
Less: Convertible senior notes discounts and issuance costs, net of amortization	(69,132)	(74,126)
Net carrying amount	390,868	385,874
Equity component, net of issuance costs	92,567	92,567
Series B Notes
Debt Instrument [Line Items]
Principal	460,000	460,000
Less: Convertible senior notes discounts and issuance costs, net of amortization	(99,662)	(103,894)
Net carrying amount	360,338	356,106
Equity component, net of issuance costs	$ 117,834	$ 117,834

Convertible Senior Notes - Sc55

Convertible Senior Notes - Schedule of Interest Expense related to the Convertible Senior Notes (Details) - Convertible Senior Notes - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Series A Notes
Debt Instrument [Line Items]
Coupon interest	$ 1,150	$ 1,150
Amortization of convertible senior notes discounts and issuance costs	4,993	4,743
Total interest expense recognized	$ 6,143	$ 5,893
Effective interest rate on the liability component	6.40%	6.40%
Series B Notes
Debt Instrument [Line Items]
Coupon interest	$ 1,869	$ 1,869
Amortization of convertible senior notes discounts and issuance costs	4,232	4,037
Total interest expense recognized	$ 6,101	$ 5,906
Effective interest rate on the liability component	6.90%	7.00%

Convertible Senior Notes - Na56

Convertible Senior Notes - Narrative - Prepaid Forward Stock Purchase (Details) shares in Millions, $ in Millions	1 Months Ended
	Jun. 30, 2015USD ($)shares
Debt Disclosure [Abstract]
Stock repurchased during period | $	$ 150
Stock repurchase during period (shares) | shares	3.3

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details)	3 Months Ended
	Mar. 31, 2017USD ($)claim	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Long-term Purchase Commitment [Line Items]
Rent expense	$ 4,100,000	$ 3,600,000
Future minimum sublease rentals	7,100,000
Letters of credit available	3,200,000		$ 3,100,000
Amount drawn against letters of credit	0		0
Non-cancellable open orders	$ 12,700,000		$ 10,200,000
Number of claims | claim	0
Software and Services
Long-term Purchase Commitment [Line Items]
Non-cancellable open orders	$ 22,500,000

Commitments and Contingencies58

Commitments and Contingencies - Schedule of Future Non-cancelable Minimum Rental Payments for Operating Leases (Details) $ in Thousands	Mar. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017 (remaining nine months)	$ 11,822
2,018	16,553
2,019	12,915
2,020	12,787
2,021	10,992
2022 and thereafter	39,276
Total	$ 104,345

Common Shares Reserved for Is59

Common Shares Reserved for Issuance - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2017vote_per_share$ / sharesshares	Dec. 31, 2016vote_per_share$ / sharesshares
Class of Stock [Line Items]
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, par value (usd per share) | $ / shares	$ 0.0001	$ 0.0001
Voting right per common share | vote_per_share	1	1,000
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized (shares)	100,000,000	100,000,000
Preferred stock, par value (usd per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred stock, shares issued (shares)	0	0
Preferred stock outstanding (shares)	0	0

Common Shares Reserved for Is60

Common Shares Reserved for Issuance - Schedule of Reserved Shares of Common Stock for Issuance (Details) - shares shares in Thousands	Mar. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Shares reserved for future issuance (shares)	63,173	55,997
Convertible Senior Notes
Class of Stock [Line Items]
Shares reserved for future issuance (shares)	15,141	15,141
ESPP
Class of Stock [Line Items]
Shares reserved for future issuance (shares)	4,597	2,851
Reserved under stock award plans
Class of Stock [Line Items]
Shares reserved for future issuance (shares)	43,435	38,005

Equity Award Plans - Narrative

Equity Award Plans - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (shares)	63,173	55,997
Granted (shares)	9,674
Compensation cost not yet recognized	$ 349
Compensation cost not yet recognized, period for recognition	2 years 6 months
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (shares)	4,597	2,851
Acquisition price at lower of fair market value, percentage	85.00%
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period	4 years
Award expiration period from grant date	10 years
Employee stock ownership, combined voting power of all stock	10.00%
Minimum exercise price as a percentage of the fair value per share	110.00%
Award expiration period, for excess voting power grants	5 years
Shares reserved for future issuance (shares)	11,400	10,000
2013 Plan | Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value, percentage, no less than	100.00%

Equity Award Plans - Summary of

Equity Award Plans - Summary of the Activity for Stock Option Changes and Summary of Information Related to Options Vested and Expected to Vest and Options Exercisable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, options outstanding (shares)	8,085
Exercised (shares)	(906)
Cancelled (shares)	(160)
Ending balance, options outstanding (shares)	7,019	8,085
Options exercisable (shares)	6,647
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance, weighted average exercise price (usd per share)	$ 10.70
Exercised, weighted average exercise price (usd per share)	4.76
Cancelled, weighted average exercise price (usd per share)	29.74
Ending balance, weighted average exercise price (usd per share)	11.04	$ 10.70
Options exercisable, weighted average exercise price (usd per share)	$ 10.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Beginning balance, options outstanding, weighted average contractual life	5 years 2 months 16 days	5 years 4 months 24 days
Ending balance, options outstanding, weighted average contractual life	5 years 2 months 16 days	5 years 4 months 24 days
Options exercisable, weighted average contractual life	5 years 1 month 21 days
Beginning balance, options outstanding, aggregate intrinsic value	$ 40,304
Exercised, aggregate intrinsic value	6,645
Ending balance, options outstanding, aggregate intrinsic value	37,567	$ 40,304
Options exercisable, aggregate intrinsic value	$ 37,136

Equity Award Plans - Summary 63

Equity Award Plans - Summary of Activity for Restricted Common Stock, RSAs and RSUs and Summary of Information Related to Unvested Restricted Common Stock, RSAs and RSUs and those Expected to Vest (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance, unvested (shares)	19,883
Granted (shares)	9,674
Vested (shares)	(2,341)
Cancelled (shares)	(2,233)
Ending balance, unvested (shares)	24,983	19,883
Expected to vest (shares)	4,694
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, unvested, weighted average grant date fair value (per share)	$ 22.23
Weighted average grant date fair value, granted (per share)	11.53
Weighted average grant date fair value, vested (per share)	24.16
Weighted average grant date fair value, cancelled (per share)	16.04
Ending balance, unvested, weighted average grant date fair value (per share)	17.80	$ 22.23
Weighted average grant date fair value, expected to vest (per share)	$ 14.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Beginning balance, weighted-average remaining contractual term	1 year 8 months 12 days	1 year 6 months
Ending balance, weighted-average remaining contractual term	1 year 8 months 12 days	1 year 6 months
Beginning balance, aggregate intrinsic value	$ 236,605
Ending balance, aggregate intrinsic value	$ 315,029	$ 236,605
Expected to vest, weighted-average remaining contractual term	2 years 2 months 12 days
Expected to vest, aggregate intrinsic value	$ 59,192

Equity Award Plans - Schedule o

Equity Award Plans - Schedule of Stock-Based Compensation Expense Related to Stock Options, ESPP and Restricted Stock Units and Awards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 43,889	$ 64,067
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	535	667
Cost of subscription and services revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	7,497	9,601
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	14,525	24,430
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	14,015	16,154
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 7,317	$ 13,215

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 1,293	$ (10,030)

Net Loss per Share - Schedule o

Net Loss per Share - Schedule of Computation of Net Loss per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net loss	$ (82,988)	$ (155,900)
Denominator:
Weighted average number of shares outstanding—basic and diluted (shares)	172,236	158,781
Net loss per share—basic and diluted (usd per share)	$ (0.48)	$ (0.98)

Net Loss per Share - Schedule67

Net Loss per Share - Schedule of Outstanding Options and Unvested Shares Excluded from Computation of Diluted Net Loss per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	7,019	10,627
Unvested early exercised common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	0	647
Unvested restricted stock awards and units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	24,983	23,896
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	15,141	15,141
ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from net loss per share (shares)	784	667

Employee Benefit Plan - Narrati

Employee Benefit Plan - Narrative (Details)	3 Months Ended
	Mar. 31, 2017USD ($)
Compensation and Retirement Disclosure [Abstract]
Employer contributions vested percentage	100.00%
Employer contributions to 401(k)	$ 0

Segment and Major Customers I69

Segment and Major Customers Information - Schedule of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 173,738	$ 167,966
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	115,004	115,852
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	25,321	24,442
APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	25,853	21,823
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 7,560	$ 5,849

Segment and Major Customers I70

Segment and Major Customers Information - Summary of Long lived Assets by Geographic Region Based on Physical Location (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Entity Location [Line Items]
Total property and equipment, net	$ 60,814	$ 61,852
United States
Entity Location [Line Items]
Total property and equipment, net	43,800	43,214
International
Entity Location [Line Items]
Total property and equipment, net	$ 17,014	$ 18,638

Segment and Major Customers I71

Segment and Major Customers Information - Narrative (Details) - reporting_segment	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue, Major Customer [Line Items]
Number of reportable segment and operating unit structure	1
Customer concentration risk | Sales revenue, net | Distributor One
Revenue, Major Customer [Line Items]
Concentration risk percentage	19.00%	17.00%
Customer concentration risk | Sales revenue, net | Reseller
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.00%	11.00%