Imperva 10-Q 3 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	IMPV
Entity Registrant Name	IMPERVA INC
Entity Central Index Key	1,364,962
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,814,837

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	[1]
CURRENT ASSETS:
Cash and cash equivalents	$ 147,427	$ 107,343
Short-term investments	172,460	153,749
Restricted cash	52	68
Accounts receivable, net of allowance of $1,641 and $ 1,784 as of June 30, 2017 and December 31, 2016, respectively	59,333	62,571
Inventory	436	590
Prepaid expenses and other current assets	11,340	7,922
Insurance recoveries receivable	19,000
Total current assets	410,048	332,243
Property and equipment, net	24,788	21,496
Goodwill	36,389	37,448
Acquired intangible assets, net	3,449	8,393
Severance pay fund	6,280	5,070
Restricted cash	2,054	1,884
Deferred tax assets	2,813	1,220
Other assets	6,162	1,065
TOTAL ASSETS	491,983	408,819
CURRENT LIABILITIES:
Accounts payable	6,044	5,529
Accrued compensation and benefits	21,342	20,840
Accrued and other current liabilities	8,898	7,683
Accrued legal settlement	19,000	0
Deferred revenue	106,332	104,042
Total current liabilities	161,616	138,094
Other liabilities	8,282	6,637
Deferred revenue	27,818	26,429
Accrued severance pay	7,152	5,696
TOTAL LIABILITIES	204,868	176,856
Commitments and Contingencies (Note 6)
STOCKHOLDERS' EQUITY:
Preferred stock, $0.0001 par value - 5,000,000 shares authorized, no shares issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	0	0
Common stock, $0.0001 par value - 145,000,000 shares authorized, 33,813,897 and 33,088,990 shares issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	3	3
Additional paid-in capital	546,205	510,257
Accumulated deficit	(259,813)	(276,819)
Accumulated other comprehensive income (loss)	720	(1,478)
TOTAL STOCKHOLDERS' EQUITY	287,115	231,963
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 491,983	$ 408,819
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,641	$ 1,784
Preferred stock, par value, per share	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value, per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	145,000,000	145,000,000
Common stock, shares issued	33,813,897	33,088,990
Common stock, shares outstanding	33,813,897	33,088,990

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net revenue:
Products and license	$ 20,012,000	$ 14,830,000	$ 39,590,000	$ 35,671,000
Services	54,423,000	43,043,000	107,153,000	81,975,000
Total net revenue	74,435,000	57,873,000	146,743,000	117,646,000
Cost of revenue:
Products and license	1,823,000	1,814,000	3,755,000	3,998,000
Services	13,751,000	10,703,000	26,771,000	21,487,000
Total cost of revenue	15,574,000	12,517,000	30,526,000	25,485,000
Gross profit	58,861,000	45,356,000	116,217,000	92,161,000
Operating expenses:
Research and development	14,528,000	15,576,000	31,978,000	31,595,000
Sales and marketing	36,388,000	40,977,000	73,512,000	81,717,000
General and administrative	12,375,000	12,245,000	25,911,000	26,131,000
Restructuring charges	0	0	667,000	0
Amortization of acquired intangible assets	132,000	352,000	449,000	704,000
Total operating expenses	63,423,000	69,150,000	132,517,000	140,147,000
Loss from operations	(4,562,000)	(23,794,000)	(16,300,000)	(47,986,000)
Gain on sale of business	0	0	35,871,000	0
Other income (expense), net	158,000	(241,000)	66,000	(158,000)
(Loss) income before provision for income taxes	(4,404,000)	(24,035,000)	19,637,000	(48,144,000)
(Benefit) provision for income taxes	(914,000)	681,000	44,000	579,000
Net (loss) income	$ (3,490,000)	$ (24,716,000)	$ 19,593,000	$ (48,723,000)
Earnings per share:
Basic	$ (0.10)	$ (0.77)	$ 0.59	$ (1.52)
Diluted	$ (0.10)	$ (0.77)	$ 0.58	$ (1.52)
Shares used in computing earnings per share:
Basic	33,640	32,163	33,425	31,984
Diluted	33,640	32,163	33,984	31,984

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net Income (loss)	$ (3,490)	$ (24,716)	$ 19,593	$ (48,723)
Other comprehensive gain (loss) (net of tax):
Net change in net unrealized gain (loss) on investments	22	37	50	206
Net change in unrealized gain (loss) on hedging instruments	419	(654)	2,148	262
Other comprehensive income (loss)	441	(617)	2,198	468
Comprehensive income (loss)	$ (3,049)	$ (25,333)	$ 21,791	$ (48,255)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2015	$ 240,201		$ 3	$ 448,069	$ (206,540)	$ (1,331)
Beginning balance, shares at Dec. 31, 2015			31,837,144
Issuance of common stock under employee equity plans, net of repurchases	5,682			5,682
Issuance of common stock under employee equity plans, net of repurchases, shares			540,602
Issuance of holdback shares in connection with acquisitions, shares			206,499
Stock-based compensation	29,635			29,635
Income tax deficiencies from employee stock option exercises	(14)			(14)
Shares withheld for tax withholding on vesting of restricted stock units	(3,954)			(3,954)
Components of other comprehensive income (loss), net of tax
Change in unrealized gain (loss) on investments	206					206
Change in unrealized gain (loss) on hedging instruments	262					262
Net income (loss)	(48,723)				(48,723)
Comprehensive income (loss)	(48,255)
Ending balance at Jun. 30, 2016	223,295		$ 3	479,418	(255,263)	(863)
Ending balance, shares at Jun. 30, 2016			32,584,245
Beginning balance at Mar. 31, 2016						(246)
Components of other comprehensive income (loss), net of tax
Change in unrealized gain (loss) on investments	37
Change in unrealized gain (loss) on hedging instruments	(654)
Net income (loss)	(24,716)
Comprehensive income (loss)	(25,333)
Ending balance at Jun. 30, 2016	223,295		$ 3	479,418	(255,263)	(863)
Ending balance, shares at Jun. 30, 2016			32,584,245
Beginning balance at Dec. 31, 2016	231,963	[1]	$ 3	510,257	(276,819)	(1,478)
Beginning balance, shares at Dec. 31, 2016			33,088,990
Cumulative effect of a change in accounting principle	14			2,601	(2,587)
Issuance of common stock under employee equity plans, net of repurchases	14,851			14,851
Issuance of common stock under employee equity plans, net of repurchases, shares			724,907
Stock-based compensation	25,117			25,117
Shares withheld for tax withholding on vesting of restricted stock units	(6,621)			(6,621)
Components of other comprehensive income (loss), net of tax
Change in unrealized gain (loss) on investments	50					50
Change in unrealized gain (loss) on hedging instruments	2,148					2,148
Net income (loss)	19,593				19,593
Comprehensive income (loss)	21,791
Ending balance at Jun. 30, 2017	287,115		$ 3	546,205	(259,813)	720
Ending balance, shares at Jun. 30, 2017			33,813,897
Beginning balance at Mar. 31, 2017						279
Components of other comprehensive income (loss), net of tax
Change in unrealized gain (loss) on investments	22
Change in unrealized gain (loss) on hedging instruments	419
Net income (loss)	(3,490)
Comprehensive income (loss)	(3,049)
Ending balance at Jun. 30, 2017	$ 287,115		$ 3	$ 546,205	$ (259,813)	$ 720
Ending balance, shares at Jun. 30, 2017			33,813,897
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (loss)	$ 19,593		$ (48,723)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	4,943		2,961
Stock-based compensation	25,117		32,759
Amortization of acquired intangibles	449		704
Loss on disposals	0		255
Amortization of premiums/accretion of discounts on short-term investments	(104)		111
Excess tax deficiencies from share-based compensation	0		14
Gain on sale of business	(35,871)		0
Other	(1,255)		(228)
Changes in operating assets and liabilities:
Accounts receivable, net	3,238		17,172
Inventory	192		(26)
Prepaid expenses and other assets	(864)		281
Accounts payable	(1,901)		(2,570)
Accrued compensation and benefits	3,626		(7,037)
Accrued and other liabilities	2,990		(209)
Severance pay (net)	246		328
Deferred revenue	5,132		8,160
Deferred tax assets	(1,593)		(158)
Net cash provided by operating activities	23,938		3,794
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales/maturities of short-term investments	50,923		34,331
Purchase of short-term investments	(69,451)		(77,067)
Proceeds from sale of business	35,015		0
Net purchases of property and equipment	(6,546)		(8,263)
Change in restricted cash	(154)		12
Net cash provided by (used in) investing activities	9,787		(50,987)
CASH FLOWS FROM FINANCING ACTIVITIES:
Settlement of holdback liability	0		(7,157)
Proceeds from issuance of common stock, net of repurchases	11,725		5,682
Shares withheld for tax withholding on vesting of restricted stock units	(6,621)		(3,954)
Offering costs relating to follow-on public offering	0		(112)
Excess tax deficiencies from share-based compensation	0		(14)
Net cash provided by (used in) financing activities	5,104		(5,555)
Effect of exchange rate changes on cash and cash equivalents	1,255		228
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	40,084		(52,520)
CASH AND CASH EQUIVALENTS - Beginning of period	107,343	[1]	168,252
CASH AND CASH EQUIVALENTS - End of period	147,427		115,732
NONCASH INVESTING AND FINANCING ACTIVITIES:
Property and equipment acquired but not yet paid	$ 2,520		$ 2,375
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	1. Basis of Presentation and Summary of Significant Accounting Policies Business Imperva, Inc. (together with its subsidiaries, the “Company”) was incorporated in April 2002 in Delaware. The Company is headquartered in Redwood Shores, California and has subsidiaries located throughout the world including Israel, Asia and Europe. The Company is engaged in the development, marketing, sales, service and support of cyber-security solutions that protect business-critical data and applications whether in the cloud or on premises. Basis of Presentation The Company has prepared the accompanying unaudited Condensed Consolidated Financial Statements in accordance with Article 10 of Regulation S-X and pursuant to the rules and regulations for Form 10-Q of the Securities and Exchange Commission (the “SEC”). Pursuant to those rules and regulations, the Company has condensed or omitted certain information and footnote disclosure it normally includes in its annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). In management’s opinion, the Company has made all adjustments (consisting only of normal, recurring adjustments, except as otherwise indicated) necessary to fairly present its consolidated financial position, results of operations, and cash flows. The Company’s interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. These financial statements and accompanying notes should be read in conjunction with the consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, which was filed with the SEC on February 27, 2017 (the “Annual Report”). The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Concentration of Revenue and Accounts Receivable Significant customers are those which represent 10% or more of the Company’s total revenue or gross accounts receivable balance at each respective balance sheet date. The Company primarily sells products and services through channel partners, including distributors and resellers, which sell to end-user customers. For the six months ended June 30, 2017 and 2016, no single end-user customer represented 10% or more of the Company’s total revenue or gross accounts receivable balance. During those periods, the Company had one reseller that represented 10% or more of the Company’s total revenue or gross accounts receivable balance at each respective balance sheet date as follows: Revenue Accounts Receivable For the three months ended June 30, For the six months ended June 30, As of June 30, As of December 31, 2017 2016 2017 2016 2017 2016 12 % 12 % 12 % 13 % 21 % 18 % Significant Accounting Policies The Company adopted the guidance in Accounting Standards Update (“ASU”) 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting, on January 1, 2017. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. The Company has elected to recognize forfeitures as they occur and the impact of that change in accounting policy has been recorded as a $2.6 million cumulative effect adjustment to increase our accumulated deficit as of January 1, 2017. Additionally, the Company has elected to use a prospective transition method for presentation of excess tax benefits on the statement of cash flows. The remaining provisions of ASU 2016-09 did not have a material impact on the accompanying condensed consolidated financial statements. Insurance Recoveries Receivable Insurance recoveries receivable consists of amounts receivable to the Company from insurance recoveries in connection with settlement costs and professional fees. Claims for loss recoveries are generally recognized when a loss event has occurred and recovery is considered probable. There have been no other material changes to the Company’s significant accounting policies as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. Recent Accounting Pronouncements In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2017-09 “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting”, which clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Under the new guidance, modification accounting is required if the fair value, vesting conditions or classification (equity or liability) of the new award are different from the original award immediately before the original award is modified. The standard is effective for the Company on January 1, 2018, with early adoption permitted. The new guidance must be applied prospectively to awards modified on or after the adoption date. The future impact of ASU 2017-09 will be dependent on the nature of future stock award modifications. In January 2017, FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (Topic 350), which simplifies the measurement of goodwill impairment by removing the second step of the goodwill impairment test, which requires the determination of the fair value of individual assets and liabilities of a reporting unit. Under this guidance, goodwill impairment is to be measured as the amount by which a reporting unit’s carrying value exceeds its fair value with the loss recognized not to exceed the total amount of goodwill allocated to the reporting unit. The guidance is effective beginning January 1, 2020 on a prospective basis, with early adoption permitted for interim or annual goodwill impairment tests performed after January 1, 2017. The standard is to be applied on a prospective basis. The Company does not anticipate a material impact to the consolidated financial statements once implemented. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new standard clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and should be applied prospectively with early adoption permitted under certain scenarios. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The new standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard will be effective for the Company beginning January 1, 2018, with early application permitted. The standard will require adoption on a retrospective basis. The new accounting pronouncements will not have a significant impact on the Company’s consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The new standard will make eight targeted changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The standard will be effective for the Company beginning January 1, 2018, with early application permitted. The standard will require adoption on a retrospective basis unless it is impracticable to apply, in which case we would be required to apply the amendments prospectively as of the earliest date practicable. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. In June 2016, the FASB Issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new standard requires financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The standard will be effective for the Company beginning January 1, 2020, with early application permitted. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 regarding ASC Topic 842 “Leases.” The amendments in this guidance require balance sheet recognition of lease assets and lease liabilities by lessees for leases classified as operating leases, with an optional policy election to not recognize lease assets and lease liabilities for leases with a term of 12 months or less. The amendments also require new disclosures, including qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. The standard will be effective for the Company beginning January 1, 2019. The amendments require a modified retrospective approach with optional practical expedients. While the Company continues to evaluate the effect of the standard on its ongoing financial reporting, the Company anticipates that the adoption of the ASU may materially affect its Balance Sheet. In May 2014, the FASB issued ASU 2014-09—Revenue (Topic 606): Revenue from Contracts with Customers. The standard will replace most existing U.S. GAAP guidance on this topic. The standard provides a unified model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. The standard defines a five-step process to achieve this core principle and, in doing so, it is possible more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation, among others. The standard also provides guidance on the recognition of costs related to obtaining customer contracts. The standard will be effective for the Company beginning January 1, 2018 using either of two methods: (1) retrospective application of the standard to each prior reporting period presented with the option to elect certain practical expedients as defined within the standard, or (2) retrospective application of the standard with the cumulative effect of initially applying the standard recognized at the date of initial application and providing certain additional disclosures as defined per the standard. The Company plans to adopt the standard under the modified retrospective method effective January 1, 2018. The Company’s ability to adopt using the modified retrospective method is dependent on several factors such as the significance of the impact of the new standard on the Company’s financial results, and system readiness, including software procured from third-party providers and the completion of the Company’s analysis of information necessary to determine the cumulative effect of adoption recognized as of the date of initial application. The Company has developed a project plan for this transition, which includes necessary changes to accounting policies, processes, internal controls, and system requirements and is progressing as planned. The Company expects to implement the plan in time to report in accordance with ASC 606 for the first quarterly filing on Form 10-Q for the period ended March 31, 2018. As part of its preliminary evaluation, the Company has considered the impact of the standard’s requirements with respect to capitalization and amortization of incremental costs of obtaining a contract, primarily sales commissions. Under the Company’s current accounting policy, contract origination costs are expensed as incurred. The new standard requires the capitalization of all incremental costs that the Company incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained, provided the Company expects to recover the costs. The Company is reviewing historical costs to identify those that meet the new standard’s capitalization requirement. Under the new standard, the Company will amortize these costs over a period of benefit, as estimated by management, which may extend beyond the contract term. The Company’s contracts with customers frequently include multiple performance obligations. For such arrangements, we will allocate revenue to each performance obligation based on its relative standalone selling price. The Company is analyzing its historical sales data and expects to determine standalone selling prices based on the prices charged to customers. While the Company continues to assess the potential impacts of the new standard on its consolidated financial statements and related disclosures, the Company does not know or cannot reasonably estimate quantitative information related to the impact of the new standard on the financial statements at this time. The preliminary assessments are subject to change as the Company continues to assess the new standard along with industry trends and additional interpretive guidance.

Cash, Cash Equivalents, and Sho

Cash, Cash Equivalents, and Short-Term Investments	6 Months Ended
	Jun. 30, 2017
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents, and Short-Term Investments	2. Cash, Cash Equivalents, and Short-Term Investments The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents consist of cash on hand, highly liquid investments in commercial paper, money market funds corporate debt obligations and various deposit accounts. The Company considers all high quality investments purchased with original maturities at the date of purchase greater than three months to be short-term investments. Investments are available to be used for current operations and are, therefore, classified as current assets even though maturities may extend beyond one year. Cash equivalents and short-term investments are classified as available-for-sale and are, therefore, recorded at fair value on the condensed consolidated balance sheets, with any unrealized gains and losses reported in accumulated other comprehensive income (loss), which is reflected as a separate component of stockholders’ equity in its condensed consolidated balance sheets, until realized. The Company uses the specific-identification method to compute gains and losses on the investments. The amortized cost of securities is adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization and accretion is included as a component of other income (expense), net in the condensed consolidated statements of operations. Cash, cash equivalents and short-term investments consist of the following (in thousands): As of June 30, 2017 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cash and cash equivalents: Cash $ 53,728 $ - $ - $ 53,728 Commercial paper 5,490 - 1 5,489 Money market funds 84,359 - - 84,359 Corporate debt obligations 3,852 - 1 3,851 Total $ 147,429 $ - $ 2 $ 147,427 Short-term investments: Commercial paper $ 14,228 $ - $ 11 $ 14,217 Corporate debt obligations 143,078 1 266 142,813 US government agencies 14,998 - 47 14,951 Bank deposits 480 - 1 479 Total $ 172,784 $ 1 $ 325 $ 172,460 As of December 31, 2016 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cash and cash equivalents: Cash $ 63,642 $ - $ - $ 63,642 Commercial paper 6,995 - 2 6,993 Money market funds 36,708 - - 36,708 Total $ 107,345 $ - $ 2 $ 107,343 Short-term investments: Commercial paper $ 14,245 $ - $ 8 $ 14,237 Corporate debt obligations 110,062 - 347 109,715 US government agencies 18,998 2 50 18,950 Bank deposits 10,846 1 - 10,847 Total $ 154,151 $ 3 $ 405 $ 153,749 The following table summarizes the cost and estimated fair value of short-term investments based on stated effective maturities as of June 30, 2017 (in thousands): As of June 30, 2017 Estimated Amortized Fair Cost Value Short-term investments: Due within one year $ 88,396 $ 88,258 Due within two years 84,388 84,202 Total $ 172,784 $ 172,460 The gross unrealized loss related to these securities was due primarily to changes in interest rates. The Company reviews its short-term investments on a regular basis to evaluate whether or not any security has experienced an other-than-temporary decline in fair value. The Company considers factors such as the length of time and extent to which the market value has been less than the cost, the financial condition and near-term prospects of the issuer and its intent to sell, or whether it is more likely than not the Company will be required to sell, the investment before recovery of the investment’s amortized cost basis. If the Company believes that an other-than-temporary decline exists in one of these securities, the Company writes down these investments to fair value. For debt securities, the portion of the write-down related to credit loss would be recorded to other income (expense), net, in the Company’s condensed consolidated statements of operations. Any portion not related to credit loss would be recorded to accumulated other comprehensive income (loss), which is reflected as a separate component of stockholders’ equity in the Company’s condensed consolidated balance sheets. During the three and six months ended June 30, 2017 and 2016, the Company did not consider any of its investments to be other-than-temporarily impaired. The following tables show the short-term investments in an unrealized loss position and the related gross unrealized losses and fair value and length of time that the short-term investments have been in a continuous unrealized loss position (in thousands): As of June 30, 2017 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 14,217 $ 11 $ - $ - $ 14,217 $ 11 Corporate debt obligations 89,716 186 50,082 80 139,798 $ 266 US government agencies 9,458 40 5,493 7 14,951 47 Bank deposits 480 1 - - 480 $ 1 $ 113,871 $ 238 $ 55,575 $ 87 $ 169,446 $ 325 As of December 31, 2016 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 14,237 $ 8 $ - $ - $ 14,237 $ 8 Corporate debt obligations 78,821 323 29,689 24 108,510 $ 347 US government agencies 11,451 46 3,496 4 14,947 50 $ 104,509 $ 377 $ 33,185 $ 28 $ 137,694 $ 405

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	3. Fair Value of Financial Instruments The Company evaluates assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level to classify them for each reporting period. There have been no transfers between fair value measurement levels during the three and six months ended June 30, 2017. The Company’s cash equivalents and short-term investment instruments are classified within Level 1 or Level 2 of the fair value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. The types of instruments valued based on quoted market prices in active markets include mutual funds and money market securities, and are generally classified within Level 1 of the fair value hierarchy. The types of instruments valued based on quoted prices in less active markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability include U.S. agency securities, investment-grade corporate bonds, bank deposits, and commercial paper. Such instruments are generally classified within Level 2 of the fair value hierarchy. The Company executes its foreign currency contracts primarily in the retail market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large multi-national and regional banks. The Company’s foreign currency contracts valuation inputs are based on quoted prices and quoted pricing intervals from public data sources and do not involve management judgment. These contracts are typically classified within Level 2 of the fair value hierarchy. The following table sets forth the Company’s assets and liabilities that were measured at fair value as of June 30, 2017 and December 31, 2016, by level within the fair value hierarchy (in thousands): As of June 30, 2017 Level I Level II Level III Fair Financial Assets: Cash equivalents: Commercial paper $ - $ 5,489 $ - $ 5,489 Money market funds 84,359 - - 84,359 Corporate debt obligations - 3,851 - 3,851 Short-term investments: Commercial paper - 14,217 - 14,217 Corporate debt obligations - 142,813 - 142,813 US government agencies - 14,951 - 14,951 Bank deposits - 479 - 479 Prepaid expenses and other current assets - Forward foreign exchange contracts - 2,263 - 2,263 Total financial assets $ 84,359 $ 184,063 $ - $ 268,422 As of December 31, 2016 Level I Level II Level III Fair Value Financial Assets: Cash equivalents: Commercial paper $ - $ 6,993 $ - $ 6,993 Money market funds 36,708 - - 36,708 Short-term investments: Commercial paper - 14,237 - 14,237 Corporate debt obligations - 109,715 - 109,715 US government agencies - 18,950 - 18,950 Bank deposits - 10,847 - 10,847 Total financial assets $ 36,708 $ 160,742 $ - $ 197,450 Financial Liability: Accrued and other current liabilities - Forward foreign exchange contracts $ - $ 639 $ - $ 639 In addition to the amounts disclosed in the above table, the fair value of the Company’s Israeli severance pay assets, which were comprised of Level II assets, was $6.3 million and $5.1 million as of June 30, 2017 and December 31, 2016, respectively.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments	4. Derivative Instruments The Company’s primary objective for holding derivative instruments is to reduce its exposure to foreign currency rate changes. The Company reduces its exposure by entering into forward foreign exchange contracts with respect to operating expenses that are forecast to be incurred in currencies other than U.S. dollars. Substantially all of the Company’s revenue and capital purchasing activities and a majority of its operating expenditures are transacted in U.S. dollars. However, certain operating expenditures are incurred in or exposed to other currencies, primarily the Israeli shekel and the Euro. The Company has established forecasted transaction currency risk management programs to protect against fluctuations in fair value and the volatility of future cash flows caused by changes in exchange rates. The Company’s currency risk management program includes forward foreign exchange contracts designated as cash flow hedges. These forward foreign exchange contracts generally mature within 12 months. The Company does not enter into derivative financial instruments for trading purposes. Derivative instruments measured at fair value and their classification on the condensed consolidated balance sheets are presented in the following tables (in thousands): As of June 30, 2017 As of December 31, 2016 Notional Amount Fair Value Notional Amount Fair Value Foreign exchange forward contract derivatives in cash flow hedging relationships - included in prepaid expenses and other current assets (accrued and other current liabilities) $ 27,664 $ 2,696 $ 60,756 $ (639 ) Gains (losses) on derivative instruments and their classification on the condensed consolidated statement of operations are presented in the following table (in thousands): For the three months ended June 30 For the six months ended June 30 2017 2016 2017 2016 Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships: Gains recognized in OCI (a) $ 1,445 $ - $ 4,332 $ 1,316 Losses recognized in OCI (a) $ (17 ) $ (906 ) $ (17 ) $ (1,005 ) Gains recognized from accumulated OCI into net income (b) $ 782 $ 149 $ 988 $ 149 Losses recognized from accumulated OCI into net income (b) $ (5 ) $ (47 ) $ (10 ) $ (241 ) (a) Net change in the fair value of the effective portion classified in other comprehensive income (loss) (“OCI”). (b) Effective portion of cash flow hedges reclassified from accumulated other comprehensive income (loss) into net income, of which $54 and $723 were recognized within cost of sales and operating expenses, respectively, for the three months ended June 30, 2017; $68 and $910 were recognized within cost of sales and operating expenses, respectively, for the six months ended June 30, 2017. $6 and $96 were recognized within cost of sales and operating expenses, respectively, for the three months ended June 30, 2016 and $(7) and $(85) were recognized within cost of sales and operating expenses, respectively, for the six months ended June 30, 2016. All amounts are reflected within the respective condensed consolidated statement of operations.

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	6 Months Ended
	Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets	5. Goodwill and Acquired Intangible Assets In February 2017, the Company completed the sale of its assets related to the Skyfence cloud access security broker business (“Skyfence”) to Forcepoint LLC and its Israeli subsidiary. We allocated goodwill of $1.1 million to the business being disposed of. Additionally, the acquired intangible assets with the carrying value of $4.5 million were derecognized in connection with this transaction. The Company did not have any goodwill impairments during three and six months ended June 30, 2017 and 2016. The changes in the carrying amount of goodwill for the periods ended June 30, 2017 and December 31, 2016 were as follows (in thousands): Balance as of December 31, 2016 $ 37,448 Goodwill disposed with sale of Skyfence (1,059 ) Balance as of June 30, 2017 $ 36,389 The Company amortizes intangible assets, which consist of purchased technologies that have estimated useful lives ranging from 7 to 10 years, using the straight-line method when the consumption pattern of the asset is not apparent. The Company reviews such assets for impairment whenever an impairment indicator exists and continually monitors events and changes in circumstances that could indicate carrying amounts of the intangible assets may not be recoverable. When such events or changes in circumstances occur, the Company assesses recoverability by determining whether the carrying value of such assets exceed the estimates of future undiscounted future cash flows expected to be generated by such assets. Should impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s estimated fair value. There was no impairment of intangible assets recorded for the three and six months ended June 30, 2017 and 2016. The weighted average remaining useful life of the Company’s acquired technology, customer relationships, and trade names and other intangible assets is 6.5 years, 6.5 years, and 6.5 years, respectively as of June 30, 2017. Acquired intangible assets subject to amortization are presented as follows (in thousands): As of June 30, 2017 Gross Carrying Amount Accumulated Amortization Net Book Value Acquired technology $ 3,753 $ (1,004 ) $ 2,749 Customer relationships 480 (38 ) 442 Trade name and other 280 (22 ) 258 Total $ 4,513 $ (1,064 ) $ 3,449 As of December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Book Value Acquired technology $ 11,718 $ (4,085 ) $ 7,633 Customer relationships 480 - 480 Trade name and other 280 - 280 Total $ 12,478 $ (4,085 ) $ 8,393 Acquired intangible assets are amortized over their estimated useful lives of 7 to 10 years. As of June 30, 2017, the amortization expense in future periods is expected to be as follows (in thousands): Acquired Fiscal Year Technology 2017 (remaining 6 months) $ 265 2018 528 2019 528 2020 528 2021 528 Thereafter 1,072 Total expected amortization expense $ 3,449

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	6. Commitments and Contingencies (a) Operating Leases The Company rents its facilities under operating leases with lease periods expiring through 2022. Future minimum payments under these facility operating leases and minimum rentals to be received under non-cancellable subleases are as follows as of June 30, 2017 (in thousands): Operating Leases Estimated Sublease Income Period Ending December 31: 2017 (remaining 6 months) $ 3,601 $ 356 2018 8,459 683 2019 4,741 - 2020 4,461 - 2021 301 - Thereafter 49 - Total $ 21,612 $ 1,039 Rent expense for the Company’s operating leases is recognized on a straight-line basis over the lease term. Rent expense for the six months ended June 30, 2017 and 2016 was $3.2 million and $3.0 million, respectively. In connection with leases of office space, the Company may receive tenant improvement allowances from lessors for certain improvements the Company makes to the leased properties. The Company records the tenant improvement allowances as a leasehold improvement within property and equipment, net, and as deferred rent within other liabilities on the condensed consolidated balance sheets. The deferred rent liability is amortized to rent expense over the term of the lease on a straight-line basis. The leasehold improvements are amortized to expense over the period from when the improvements were placed into service until the end of their useful life, which is the end of the lease term. For the six months ending June 30, 2017 and 2016, the Company did not receive any tenant improvement allowances. In addition, certain of the Company’s operating lease agreements for office space also include rent holidays and scheduled rent escalations during the initial lease term. The Company has recorded the rent holidays as a deferred rent within other liabilities on the condensed consolidated balance sheets. The Company recognizes the deferred rent liability and scheduled rent increase on a straight-line basis into rent expense over the lease term commencing on the date the Company takes possession of the lease space. As of June 30, 2017 and December 31, 2016 the Company had $2.1 million and $1.9 million, respectively, in restricted deposits to secure bank guarantees provided to its lessors. (b) Cancelable Lease Agreement The Company leases motor vehicles under cancelable operating lease agreements. The Company has an option to cancel the lease agreements, which may result in penalties in a maximum amount of $0.1 million as of June 30, 2017. Motor vehicle lease expenses for the six months ended June 30, 2017 and 2016 were $1.5 million and $1.4 million, respectively. (c) Purchase Commitments As of June 30, 2017 and December 31, 2016, the Company had purchase commitments of $3.4 million and $3.8 million, respectively, to purchase inventory, trial units, and research and development equipment from its vendors. The purchase commitments result from the Company’s contractual obligation to order or build inventory in advance of anticipated sales. According to the Company’s agreements with its vendors, the Company committed to purchase inventory within six months from the date the inventory arrived at the vendor’s warehouse. (d) Litigation From time to time, the Company is subject to legal proceedings and claims in the ordinary course of business. On April 11, 2014, a purported shareholder class action lawsuit was filed in the United States District Court for the Northern District of California against the Company and certain of its current and former officers. On August 7, 2014, the Court entered an order appointing lead plaintiff and counsel for the purported class. The lead plaintiff filed an amended complaint on October 10, 2014. The lawsuit named the Company and certain of its current and former officers and purported to bring suit on behalf of those investors who purchased the Company’s publicly traded securities between May 2, 2013 and April 9, 2014. The plaintiff alleged that defendants made false and misleading statements about the Company’s operations and business and financial results and purported to assert claims for violations of the federal securities laws. The amended complaint sought unspecified compensatory damages, interest thereon, costs incurred in the action and equitable/injunctive or other relief. On January 6, 2015, defendants filed a motion to dismiss the amended complaint. On September 17, 2015, the Court granted defendants’ motion to dismiss with leave to amend. The lead plaintiff filed an amended complaint on January 13, 2016, again naming the same current and former officers, alleging false and misleading statements about the Company’s operations and business and financial results, and seeking the same relief. On February 10, 2016, defendants filed a motion to dismiss the amended complaint. On May 16, 2016, the Court granted the motion in part and denied the motion in part. On September 7, 2016, defendants filed their operative answer to the amended complaint. In July 2017, with the help of a mediator, the parties reached an agreement in principle to settle the action. The settlement, which is subject to final documentation and the approval of the Court, among other conditions, will be funded entirely by the Company’s insurance carriers, and has been accrued in current assets and current liabilities for the period ended June 30, 2017. The settlement is not deemed material to our results of operations, liquidity or capital resources as a result of the insurance receivable . In addition, the Company receives, and may in the future continue to receive, claims from third parties asserting, among other things, infringement of their intellectual property rights. Future litigation may be necessary to defend the Company, the Company’s channel partners and the Company’s customers by determining the scope, enforceability and validity of third-party proprietary rights or to establish our proprietary rights. In the opinion of management, liabilities associated with these claims from third parties, while possible, are not probable at this time, and therefore the Company has not recorded any accrual for them as of June 30, 2017 and December 31, 2016. Further, any possible range of loss cannot be reasonably estimated at this time. The ultimate outcome of any litigation is uncertain and, regardless of outcome, litigation can have an adverse impact on the Company because of defense costs, potential negative publicity, diversion of management resources and other factors. Accordingly, there can be no assurance that existing or future legal proceedings arising in the ordinary course of business or otherwise will not have a material adverse effect on the Company’s business, consolidated financial position, results of operations or cash flows. (e) Indemnification Under the indemnification provisions of its standard sales contracts, the Company agrees to defend its end customers and certain channel partners against third-party claims asserting infringement of certain intellectual property rights, which may include patents, copyrights, trademarks, or trade secrets, and to pay judgments and settlements entered on such claims. The Company’s exposure under these indemnification provisions is generally limited to the total amount paid under the agreement. However, some agreements include indemnification provisions that could potentially expose the Company to losses in excess of the amount received under the agreement. To date, there have been no claims under such indemnification provisions. Accordingly, the Company has not recorded a liability on its condensed consolidated balance sheets for these indemnification provisions. In addition to the foregoing, the Company maintains director and officer insurance, which may cover certain liabilities arising from its obligation to indemnify its directors and officers.

Stock Plans

Stock Plans	6 Months Ended
	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Plans	7. Stock Plans (a) 2003 Stock Plan During 2003, the Board of Directors adopted the 2003 Stock Plan (the “2003 Plan”), which allowed for the grant of both incentive stock options and non-qualified stock options and the direct award or sale of shares of the Company’s common stock (including restricted common stock) to officers, employees, directors, consultants and other key persons. In connection with the Company’s initial public offering, which was completed in November 2011, the Board of Directors determined not to grant any further awards under the 2003 Plan upon completion of the public offering. The 2011 Stock Option and Incentive Plan (the “2011 Plan”) replaced the 2003 Plan in November 2011. Under the 2003 Plan, incentive stock options could have been granted to employees with exercise prices of no less than the fair value of the common stock on the grant date, and non-qualified options could have been granted to employees, directors, or consultants at exercise prices of no less than 85% of the fair value of the common stock on the grant date, as determined by the Board of Directors. If, at the time the Company granted an option, the optionee directly or by attribution owned stock possessing more than 10% of the total combined voting power of all classes of stock of the Company, the option price had to have been at least 110% of the fair value. Options granted under the 2003 Plan generally expire no later than ten years from the date of grant and, in general, vest four years from the date of grant. (b) 2011 Stock Option and Incentive Plan In September 2011, the Board of Directors adopted the 2011 Plan which was subsequently approved by the Company’s stockholders. The 2011 Plan replaced the 2003 Plan and the Company no longer grants awards under the 2003 Plan. The Company initially reserved a total of 1,000,000 shares of common stock for issuance under the 2011 Plan. In addition, 955,568 reserved but unissued shares under the 2003 Stock Plan were added to the number of shares reserved for issuance under the 2011 Plan. The 2011 Plan also provided that the number of shares reserved and available for issuance under the plan would automatically increase each January 1, beginning in 2012 and ending in 2015, by 4% of the outstanding number of shares of common stock on the immediately preceding December 31. The last automatic increase occurred on January 1, 2015. In April 2017 and May 2016, the Company’s stockholders approved an increase to the share reserve under the 2011 Plan by 850,000 shares and 1,300,000 shares respectively. The 2011 Plan permits the granting of incentive stock options, non-qualified stock options, restricted stock units (“RSUs”), stock appreciation rights, restricted shares of common stock and performance share awards. The exercise price of stock options may not be less than 100% of the fair market value of the common stock on the date of grant. Options granted pursuant to the 2011 Plan generally expire no later than ten years from the date of grant. The Company also grants RSUs. RSUs granted to new hires and merit grants to existing employees generally vest over a four-year period with 25% vesting at the end of one year and the remainder vesting quarterly thereafter. Additionally, from time to time, the Company grants performance-based RSUs (“PRSUs”) PRSUs to its executives to align with the Company’s pay-for-performance philosophy. During the quarter ended June 30, 2017, the Company granted supplemental merit-based PRSUs to two executives on substantially the same terms as those granted during the prior quarter. The PRSUs provide for a target number of shares that generally vest over three years including a one year performance period and two years of service-based vesting. The PRSUs vest contingent upon the Company’s achievement of an annual contract value of subscription bookings target for fiscal 2017 and total operating expenses for 2017 that are at 110% or less of the internal operating plan. The amount of PRSUs earned may vary from zero to 200% of the target award amount depending on level of achievement, and provided the award recipient remains employed through each applicable vesting date. In addition, from the PRSUs awarded to executives during the quarter ended March 31, 2016, an aggregate of 46,619 PRSUs were issued during the quarter ended March 31, 2017, based on the Company’s achievement against its annual contract value of subscription bookings target for fiscal 2016 and achieving total operating expenses for 2016 that were 110% or less of the internal operating plan. The PRSUs are subject to vest over a two-year period and vest quarterly through February 15, 2019. (c) 2011 Employee Stock Purchase Plan In September 2011, the Board of Directors adopted the 2011 Employee Stock Purchase Plan (the “ESPP”) which was subsequently approved by the Company’s stockholders. The ESPP took effect on November 8, 2011, the effective date of the registration statement for the Company’s initial public offering. The ESPP permits eligible employees to acquire shares of the Company’s common stock by accumulating funds through periodic payroll deductions of up to 15% of base salary. Each offering period may run for no more than 24 months and consist of no more than five purchase periods. The purchase price for shares of the Company’s common stock purchased under the ESPP will be 85% of the lesser of the fair market value of the Company’s common stock on the first day of the offering period or the last trading day of the applicable purchase period within that offering period. The Company initially reserved a total of 500,000 shares of common stock for future issuance under the ESPP. The number of shares reserved for issuance under the ESPP increases automatically on January 1 of each of the first eight years commencing in 2012 by the number of shares equal to 1% of the Company’s total outstanding shares as of the immediately preceding December 31. The Board of Directors or compensation committee may reduce the amount of the increase in any particular year. No more than 20,000,000 shares of common stock may be issued under the ESPP and no other shares may be added to the ESPP without the approval of the Company’s stockholders. On January 1, 2017, the share reserve under the 2011 Employee Stock Purchase Plan was automatically increased by 330,889 shares. (d) Inducement Stock Option Plan and Agreement and Inducement Restricted Stock Unit Plan and Agreement In August 2014 and August 2015, the Compensation Committee of the Board of Directors adopted Inducement Stock Option Plans and Agreements (the “Inducement Option Plans”) and Inducement Restricted Stock Unit Plans and Agreements (the “Inducement RSU Plans”), in each case created as employment inducement awards. In accordance with the terms of the Inducement Option Plans, the Company issued options to purchase an aggregate of 290,000 shares of the Company’s common stock at an exercise price equal to the fair market value of a share of the Company’s common stock on the dates of grant of the options. The options, which have a ten-year term, vest at the rate of 25% of the shares on each of the first anniversary of the vesting commencement date with an additional 6.25% of the shares subject to the option vesting each quarter thereafter so long as the participant has not been terminated. In accordance with the terms of the Inducement RSU Plans, the Company issued RSUs representing an aggregate of 290,000 shares of the Company’s common stock. The RSUs, which expire following settlement, vest at the rate of 25% of the shares on each of the first anniversary of the vesting commencement date with an additional 6.25% of the shares subject to the RSU vesting each quarter thereafter so long as the participant has not been terminated. (e) 2015 Equity Inducement Plan In October 2015, the Board of Directors adopted the 2015 Equity Inducement Plan, a non-stockholder approved plan that provides for the granting of stock options and RSUs as employment inducement awards and in connection with acquisitions, subject to compliance with applicable securities laws and stock exchange requirements for such plans. The Company has reserved 100,000 shares of common stock for issuance under the 2015 Equity Inducement Plan. No awards have been made under the 2015 Equity Inducement Plan and the entire reserve remains available for grant. Under the terms of the 2015 Equity Inducement Plan, the exercise price of stock options may not be less than 100% of the fair market value of common stock on the date of grant and generally expire no later than ten years from the date of grant. (f) Incapsula 2010 Share Incentive Plan In March 2010, Incapsula’s board of directors adopted the Incapsula 2010 Share Incentive Plan (the “Incapsula Plan”), pursuant to which Incapsula was able to grant to its employees and service providers options to purchase shares of its common stock, restricted shares, or RSUs. As of November 2013, the total number of shares of common stock that could have been granted under the Incapsula Plan was not to exceed 10,263,211 shares in the aggregate, subject to certain adjustments. In November 2013, the board of directors of Incapsula approved the grant of RSUs for 7,095,461 shares of Incapsula’s common stock (“Incapsula RSUs”). As part of the Incapsula acquisition, the Incapsula RSUs were assumed and replaced by performance-based RSUs for Company Common Stock to be issued to continuing employees of Incapsula. The Incapsula RSUs were earned upon Incapsula’s achievement of revenue targets for Incapsula and Incapsula-related products and services for fiscal year 2014 and were converted into approximately 198,825 shares of Company Common Stock at the same exchange ratio applicable to the shares of Incapsula common stock acquired in the acquisition. In addition to performance conditions, the awards were dependent on the market price of Imperva’s common stock during February 2014, which was deemed a market condition under ASC 718. The outstanding options and RSUs under the Incapsula 2010 Stock Incentive Plan were assumed as part of the Incapsula acquisition and at the time they were assumed were equivalent to 247,184 shares of Company common stock on an as-converted basis. As of June 30, 2017, there were 4,348 assumed Incapsula options and 118 assumed Incapsula RSUs outstanding. The Company does not intend to grant any additional shares under the Incapsula 2010 Stock Incentive Plan. Option Activity The following table summarizes option activity under the Plans and related information: Options Outstanding Weighted- Average Remaining Number of Shares Weighted Average Exercise Price Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Balances - January 1, 2017 1,570,765 $ 39.64 6.90 $ 9,226 Granted - Exercised (272,676 ) $ 30.63 Cancelled or forfeited (119,002 ) $ 49.77 Balances - June 30, 2017 1,179,087 $ 40.70 6.51 $ 12,754 Vested and expected to vest - June 30, 2017 1,179,087 $ 40.70 6.51 $ 12,754 Exercisable - June 30, 2017 815,232 $ 38.95 6.10 $ 9,919 (1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $47.85 of the Company’s common stock on June 30, 2017. RSU Activity The following table summarizes RSU activity under the Plans and related information: Number of Restricted Stock Units Outstanding Weighted- Average Grant Date Fair Value Unvested - January 1, 2017 1,994,790 $ 51.42 Granted 1,052,009 $ 42.67 Granted, performance RSUs 301,900 $ 41.96 Released (495,356 ) $ 47.30 Cancelled or forfeited (435,994 ) $ 50.34 Unvested - June 30, 2017 2,417,349 $ 47.47 The aggregate intrinsic value of options exercised under the Plans was $4.2 million for the six months ended June 30, 2017. The aggregate intrinsic value is calculated as the difference between the fair market value of the Company’s common stock on the date of the exercise and the exercise price of each option multiplied by the number of options exercised. As of June 30, 2017, total compensation cost related to unvested stock-based awards granted to employees under the Plans, but not yet recognized, was $97.2 million. As of June 30, 2017, this cost will be amortized to expense over a weighted-average remaining period of 2.7 years. Future stock-based award grants will increase the amount of compensation expense to be recorded in these periods. There was no capitalized stock-based compensation expense during the three and six months ended June 30, 2017 and 2016. (g) Stock Compensation Expense The Company recognized stock-based compensation expense under the 2011 Stock Option and Incentive Plan, 2003 Stock Plan, Inducement Plans, 2011 Employee Stock Purchase Plan, and the Incapsula 2010 Share Incentive Plan in the condensed consolidated statements of operations as follows (in thousands): For the three months ended June 30 For the six months ended June 30 2017 2016 2017 2016 Cost of revenue $ 1,403 $ 1,132 $ 2,672 $ 2,525 Research and development 2,560 3,802 7,328 8,051 Sales and marketing 3,700 7,683 7,166 12,777 General and administrative 3,844 4,487 7,276 9,406 Restructuring charges 0 - 675 - Total stock-based compensation expense $ 11,507 $ 17,104 $ 25,117 $ 32,759 The Company did not issue stock option grants for the three months ended June 30, 2017 and 2016 and six months ended June 30, 2017. The fair value of stock option grants for the six months ended June 30, 2016 and ESPP grants for the three and six months ended June 30, 2017 and 2016 was estimated using the following weighted average assumptions: For the three months ended June 30 For the six months ended June 30 2017 2016 2017 2016 Stock option grants: Dividend rate - - - 0 % Risk-free interest rate - - - 1.5 % Expected term (in years) - - - 6.1 Expected volatility - - - 58 % ESPP grants: Dividend rate 0 % 0 % 0 % 0 % Risk-free interest rate 1.1 % 0.4 % 1.1 % 0.4 % Expected term (in years) 0.5 0.5 0.5 0.5 Expected volatility 52 % 58 % 52 % 58 % The fair value of the RSUs is determined using the closing price of the Company’s common stock on the date of the grant. Compensation is recognized on a straight-line basis over the requisite service period of each grant.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	8. Accumulated Other Comprehensive Income (Loss) The changes in the balances of accumulated other comprehensive income (loss) by component are as follows (in thousands): For the three months ended June 30, 2017 For the three months ended June 30, 2016 Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Balance at April 1 $ 664 $ (385 ) $ 279 $ (105 ) $ (141 ) $ (246 ) Other comprehensive income (loss) before reclassifications 1,196 22 1,218 (552 ) 37 (515 ) Amounts reclassified to net income (loss) (777 ) - (777 ) (102 ) - (102 ) Change in other comprehensive income (loss) 419 22 441 (654 ) 37 (617 ) Balance at June 30 $ 1,083 $ (363 ) $ 720 $ (759 ) $ (104 ) $ (863 ) For the six months ended June 30, 2017 For the six months ended June 30, 2016 Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Balance at January 1 $ (1,065 ) $ (413 ) $ (1,478 ) $ (1,021 ) $ (310 ) $ (1,331 ) Other comprehensive income (loss) before reclassifications 3,126 50 3,176 170 206 376 Amounts reclassified to net loss (978 ) - (978 ) 92 - 92 Change in other comprehensive income (loss) 2,148 50 2,198 262 206 468 Balance at June 30 $ 1,083 $ (363 ) $ 720 $ (759 ) $ (104 ) $ (863 ) The following is a summary of reclassifications out of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2017 and 2016 (in thousands): For the three months ended June 30, 2017 For the three months ended June 30, 2016 Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Unrealized gains (losses) on cash flow hedges: Current period unrealized gain (loss) $ 1,428 (232 ) $ 1,196 $ (906 ) 354 $ (552 ) Reclassification adjustments 1 (777 ) - (777 ) (102 ) - (102 ) Unrealized gains (losses) on cash flow hedges, net 651 (232 ) 419 (1,008 ) 354 (654 ) Unrealized gains (losses) on investments: Current period unrealized gain (loss) $ 34 (12 ) 22 $ 57 (20 ) 37 Unrealized gains (losses) on investments: 34 (12 ) 22 57 (20 ) 37 Other comprehensive income (loss) $ 685 $ (244 ) $ 441 $ (951 ) $ 334 $ (617 ) For the six months ended June 30, 2017 For the six months ended June 30, 2016 Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Unrealized gains (losses) on cash flow hedges: Current period unrealized gain (loss) $ 4,315 (1,189 ) $ 3,126 $ 311 (141 ) $ 170 Reclassification adjustments 1 (978 ) - (978 ) 92 92 Unrealized gains (losses) on cash flow hedges, net 3,337 (1,189 ) 2,148 403 (141 ) 262 Unrealized gains (losses) on investments: Current period unrealized gain (loss) $ 78 (28 ) 50 $ 317 (111 ) 206 Unrealized gains (losses) on investments: 78 (28 ) 50 317 (111 ) 206 Other comprehensive income (loss) $ 3,415 $ (1,217 ) $ 2,198 $ 720 $ (252 ) $ 468 1

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes The Company is subject to income tax in the United States as well as other tax jurisdictions in which it conducts business. Earnings from non-U.S. activities are subject to local country income tax. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries as such earnings are to be reinvested indefinitely. For the three months ended June 30, 2017 and 2016, the Company recorded an income tax benefit of $0.9 million and income tax expense of $0.7 million respectively. The income tax benefit for the three months ended June 30, 2017, was primarily attributable to tax benefits related to employee gains from their sale of Company stock and intraperiod tax benefit allocation related to unrealized gains reported in other comprehensive income, offset in part by foreign and state income taxes. The income tax expense for the three months ended June 30, 2016 was primarily attributable to foreign and state income taxes. For the six months ended June 30, 2017 and 2016, the Company recorded income tax expense of less than $0.1 million and $0.6 million, respectively. The income tax expense for the six months ended June 30, 2017, was primarily attributable to foreign and state income taxes including tax effects of the gain related to the sale of the Skyfence business, offset in part by tax benefits related to employee gains from their sale of Company stock and an intraperiod tax benefit allocation related to unrealized gains reported in other comprehensive income. Additionally, the amount of unrecognized tax benefits increased during the six months ended June 30, 2017, which also contributed to the change in income tax expense for the period. The income tax expense for the six months ended June 30, 2016 was primarily attributable to foreign and state income taxes, offset in part by an intraperiod tax benefit allocation related to unrealized gains reported in other comprehensive income. Factors that impact the income tax provision include, but are not limited to, stock-based compensation expense, permanent tax adjustments, foreign operations and a valuation allowance against the Company’s domestic deferred tax assets.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Information	10. Segment Information The Company operates its business in one operating segment, which is the development, marketing, sales, service and support of cyber-security solutions that protect business-critical data and applications whether in cloud or on premises. Operating segments are defined as components of an enterprise that engage in business activities for which separate financial information is available and evaluated by the chief operating decision maker in deciding how to allocate resources and assessing performance. The chief operating decision maker is the Company’s Chief Executive Officer. The Company’s net revenue by geographic region, based on the customer’s location, is summarized as follows (in thousands): For the three months ended June 30, For the six months ended June 30, 2017 2016 2017 2016 United States $ 36,701 $ 30,208 $ 74,346 $ 63,879 EMEA 14,842 11,891 28,622 23,175 APAC 14,596 10,640 28,302 21,977 Other 8,296 5,134 15,473 8,615 Total net revenue $ 74,435 $ 57,873 $ 146,743 $ 117,646 The following table presents long-lived assets by location (in thousands): As of June 30, As of December 31, 2017 2016 United States $ 23,461 $ 20,525 Israel 4,540 9,344 Other 236 20 Total long-lived assets $ 28,237 $ 29,889

Restructuring Charges

Restructuring Charges	6 Months Ended
	Jun. 30, 2017
Restructuring Charges [Abstract]
Restructuring Charges	11. Restructuring Charges In November 2016, we implemented a restructuring plan and cost reduction initiatives to reduce expenses, streamline the organization, and reallocate resources to align more closely with future business needs. We incurred no restructuring charges during the three months ended June 30, 2017. The restructuring charge during the six months ended June 30, 2017 was $0.7 million, related to stock-based compensation. During the six months ended June 30, 2017 we also paid $1.1 million, of restructuring charges, which were recorded as a current liability within accrued compensation and benefits on the consolidated balance sheet as of December 31, 2016. There was no payment of restructuring charges during the three months ended June 30, 2017. The restructuring activity was completed by the end of the first quarter of 2017.

Net Income (Loss) per Share

Net Income (Loss) per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income (Loss) per Share	12. Net Income (Loss) per Share Basic and diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. The computation of net income (loss) per share for each period, including the number of weighted-average shares outstanding, is shown on the face of the condensed consolidated statements of operations. Diluted earnings per share is calculated using our weighted-average outstanding common shares including the dilutive effect of stock awards as determined under the treasury stock method. In periods when we recognize a net loss, we exclude the impact of outstanding stock awards from the diluted loss per share calculation as their inclusion would have an antidilutive effect. The table below shows the reconciliation of the basic and diluted shares for the three and six months ended June 30, 2017, in thousands: For the three months ended June 30, For the six months ended June 30, 2017 2016 2017 2016 Weighted average number of shares outstanding: Basic 33,640 32,163 33,425 31,984 Dilutive effects of: Employee stock options, RSU’s and share based payment awards issued to employees - - 559 - Diluted 33,640 32,163 33,984 31,984 The following outstanding shares of common stock and potential common shares were excluded from the computation of diluted net income (loss) per share of common stock for the three months ended June 30, 2017 and 2016 because including them would have been antidilutive: For the three months ended June 30, For the six months ended June 30, 2017 2016 2017 2016 Stock options to purchase common stock 1,179,087 1,812,415 670,872 1,812,415 Restricted stock units for common stock 2,417,349 2,454,882 550,544 2,454,882 Restricted stock issued in connection with Skyfence acquisition - 257,847 - 257,847

Disposition of Business

Disposition of Business	6 Months Ended
	Jun. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]
Disposition of Business	13. Disposition of Business On February 23, 2017, the Company completed the sale of the assets of its Skyfence cloud access security broker business (“Skyfence”) to Forcepoint LLC and its Israeli subsidiary for consideration of approximately $40 million in cash. Of the total consideration, approximately $5.0 million was remitted directly to escrow to secure the Company’s indemnification obligations. This escrowed amount is recorded in other assets on our condensed consolidated balance sheet as of June 30, 2017, and represents a noncash item in our condensed consolidated statement of cash flows. As a result of the sale, we recognized a gain of $35.9 million during the first quarter of 2017 included in gain on sale of Skyfence in our condensed consolidated statement of operations. The following table presents the carrying amounts of Skyfence immediately preceding the disposition on February 23, 2017: (dollars Assets Prepaid and other current assets $ 46 Property and equipment, net 219 Goodwill 1,058 Acquired intangible assets, net 4,496 Total assets $ 5,819 Liabilities Accounts payable $ 104 Accrued and other current liabilities 117 Deferred revenue 1,454 Total liabilities $ 1,675 We evaluated the disposition of Skyfence and determined it did not meet the criteria for classification as a discontinued operation and determined that the disposition is not expected to have a material impact to our quarterly consolidated operating loss and net income. However, we determined that the disposition does represent an individually significant component of our business. The following table presents certain amounts related to Skyfence in our consolidated results of operations through its disposal on February 23, 2017: For June 30, For the six months ended June 30, 2017 2016 2017 2016 (dollars in thousands) (dollars in thousands) Operating loss - $ (3,735 ) $ (3,567 ) $ (8,998 ) Loss before taxes - (3,735 ) (3,648 ) $ (8,998 ) Net loss - (3,821 ) (3,659 ) (9,129 )

Basis of Presentation and Sum21

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Business	Business Imperva, Inc. (together with its subsidiaries, the “Company”) was incorporated in April 2002 in Delaware. The Company is headquartered in Redwood Shores, California and has subsidiaries located throughout the world including Israel, Asia and Europe. The Company is engaged in the development, marketing, sales, service and support of cyber-security solutions that protect business-critical data and applications whether in the cloud or on premises.
Basis of Presentation	Basis of Presentation The Company has prepared the accompanying unaudited Condensed Consolidated Financial Statements in accordance with Article 10 of Regulation S-X and pursuant to the rules and regulations for Form 10-Q of the Securities and Exchange Commission (the “SEC”). Pursuant to those rules and regulations, the Company has condensed or omitted certain information and footnote disclosure it normally includes in its annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). In management’s opinion, the Company has made all adjustments (consisting only of normal, recurring adjustments, except as otherwise indicated) necessary to fairly present its consolidated financial position, results of operations, and cash flows. The Company’s interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. These financial statements and accompanying notes should be read in conjunction with the consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, which was filed with the SEC on February 27, 2017 (the “Annual Report”). The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Concentration of Revenue and Accounts Receivable	Concentration of Revenue and Accounts Receivable Significant customers are those which represent 10% or more of the Company’s total revenue or gross accounts receivable balance at each respective balance sheet date. The Company primarily sells products and services through channel partners, including distributors and resellers, which sell to end-user customers. For the six months ended June 30, 2017 and 2016, no single end-user customer represented 10% or more of the Company’s total revenue or gross accounts receivable balance. During those periods, the Company had one reseller that represented 10% or more of the Company’s total revenue or gross accounts receivable balance at each respective balance sheet date as follows: Revenue Accounts Receivable For the three months ended June 30, For the six months ended June 30, As of June 30, As of December 31, 2017 2016 2017 2016 2017 2016 12 % 12 % 12 % 13 % 21 % 18 %
Significant Accounting Policies	Significant Accounting Policies The Company adopted the guidance in Accounting Standards Update (“ASU”) 2016-09, Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting, on January 1, 2017. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. The Company has elected to recognize forfeitures as they occur and the impact of that change in accounting policy has been recorded as a $2.6 million cumulative effect adjustment to increase our accumulated deficit as of January 1, 2017. Additionally, the Company has elected to use a prospective transition method for presentation of excess tax benefits on the statement of cash flows. The remaining provisions of ASU 2016-09 did not have a material impact on the accompanying condensed consolidated financial statements.
Insurance Recoveries Receivable	Insurance Recoveries Receivable Insurance recoveries receivable consists of amounts receivable to the Company from insurance recoveries in connection with settlement costs and professional fees. Claims for loss recoveries are generally recognized when a loss event has occurred and recovery is considered probable. There have been no other material changes to the Company’s significant accounting policies as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2017-09 “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting”, which clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Under the new guidance, modification accounting is required if the fair value, vesting conditions or classification (equity or liability) of the new award are different from the original award immediately before the original award is modified. The standard is effective for the Company on January 1, 2018, with early adoption permitted. The new guidance must be applied prospectively to awards modified on or after the adoption date. The future impact of ASU 2017-09 will be dependent on the nature of future stock award modifications. In January 2017, FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (Topic 350), which simplifies the measurement of goodwill impairment by removing the second step of the goodwill impairment test, which requires the determination of the fair value of individual assets and liabilities of a reporting unit. Under this guidance, goodwill impairment is to be measured as the amount by which a reporting unit’s carrying value exceeds its fair value with the loss recognized not to exceed the total amount of goodwill allocated to the reporting unit. The guidance is effective beginning January 1, 2020 on a prospective basis, with early adoption permitted for interim or annual goodwill impairment tests performed after January 1, 2017. The standard is to be applied on a prospective basis. The Company does not anticipate a material impact to the consolidated financial statements once implemented. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new standard clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and should be applied prospectively with early adoption permitted under certain scenarios. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The new standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The standard will be effective for the Company beginning January 1, 2018, with early application permitted. The standard will require adoption on a retrospective basis. The new accounting pronouncements will not have a significant impact on the Company’s consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The new standard will make eight targeted changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The standard will be effective for the Company beginning January 1, 2018, with early application permitted. The standard will require adoption on a retrospective basis unless it is impracticable to apply, in which case we would be required to apply the amendments prospectively as of the earliest date practicable. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. In June 2016, the FASB Issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new standard requires financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The standard will be effective for the Company beginning January 1, 2020, with early application permitted. The Company is evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 regarding ASC Topic 842 “Leases.” The amendments in this guidance require balance sheet recognition of lease assets and lease liabilities by lessees for leases classified as operating leases, with an optional policy election to not recognize lease assets and lease liabilities for leases with a term of 12 months or less. The amendments also require new disclosures, including qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. The standard will be effective for the Company beginning January 1, 2019. The amendments require a modified retrospective approach with optional practical expedients. While the Company continues to evaluate the effect of the standard on its ongoing financial reporting, the Company anticipates that the adoption of the ASU may materially affect its Balance Sheet. In May 2014, the FASB issued ASU 2014-09—Revenue (Topic 606): Revenue from Contracts with Customers. The standard will replace most existing U.S. GAAP guidance on this topic. The standard provides a unified model to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. The standard defines a five-step process to achieve this core principle and, in doing so, it is possible more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP, including identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation, among others. The standard also provides guidance on the recognition of costs related to obtaining customer contracts. The standard will be effective for the Company beginning January 1, 2018 using either of two methods: (1) retrospective application of the standard to each prior reporting period presented with the option to elect certain practical expedients as defined within the standard, or (2) retrospective application of the standard with the cumulative effect of initially applying the standard recognized at the date of initial application and providing certain additional disclosures as defined per the standard. The Company plans to adopt the standard under the modified retrospective method effective January 1, 2018. The Company’s ability to adopt using the modified retrospective method is dependent on several factors such as the significance of the impact of the new standard on the Company’s financial results, and system readiness, including software procured from third-party providers and the completion of the Company’s analysis of information necessary to determine the cumulative effect of adoption recognized as of the date of initial application. The Company has developed a project plan for this transition, which includes necessary changes to accounting policies, processes, internal controls, and system requirements and is progressing as planned. The Company expects to implement the plan in time to report in accordance with ASC 606 for the first quarterly filing on Form 10-Q for the period ended March 31, 2018. As part of its preliminary evaluation, the Company has considered the impact of the standard’s requirements with respect to capitalization and amortization of incremental costs of obtaining a contract, primarily sales commissions. Under the Company’s current accounting policy, contract origination costs are expensed as incurred. The new standard requires the capitalization of all incremental costs that the Company incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained, provided the Company expects to recover the costs. The Company is reviewing historical costs to identify those that meet the new standard’s capitalization requirement. Under the new standard, the Company will amortize these costs over a period of benefit, as estimated by management, which may extend beyond the contract term. The Company’s contracts with customers frequently include multiple performance obligations. For such arrangements, we will allocate revenue to each performance obligation based on its relative standalone selling price. The Company is analyzing its historical sales data and expects to determine standalone selling prices based on the prices charged to customers. While the Company continues to assess the potential impacts of the new standard on its consolidated financial statements and related disclosures, the Company does not know or cannot reasonably estimate quantitative information related to the impact of the new standard on the financial statements at this time. The preliminary assessments are subject to change as the Company continues to assess the new standard along with industry trends and additional interpretive guidance.

Basis of Presentation and Sum22

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Schedule of Percentage of Total Revenue or Gross Accounts Receivable Balance	During those periods, the Company had one reseller that represented 10% or more of the Company’s total revenue or gross accounts receivable balance at each respective balance sheet date as follows: Revenue Accounts Receivable For the three months ended June 30, For the six months ended June 30, As of June 30, As of December 31, 2017 2016 2017 2016 2017 2016 12 % 12 % 12 % 13 % 21 % 18 %

Cash, Cash Equivalents, and S23

Cash, Cash Equivalents, and Short-Term Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Cash And Cash Equivalents [Abstract]
Summary of Cash, Cash Equivalents and Short-Term Investments	Cash, cash equivalents and short-term investments consist of the following (in thousands): As of June 30, 2017 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cash and cash equivalents: Cash $ 53,728 $ - $ - $ 53,728 Commercial paper 5,490 - 1 5,489 Money market funds 84,359 - - 84,359 Corporate debt obligations 3,852 - 1 3,851 Total $ 147,429 $ - $ 2 $ 147,427 Short-term investments: Commercial paper $ 14,228 $ - $ 11 $ 14,217 Corporate debt obligations 143,078 1 266 142,813 US government agencies 14,998 - 47 14,951 Bank deposits 480 - 1 479 Total $ 172,784 $ 1 $ 325 $ 172,460 As of December 31, 2016 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value Cash and cash equivalents: Cash $ 63,642 $ - $ - $ 63,642 Commercial paper 6,995 - 2 6,993 Money market funds 36,708 - - 36,708 Total $ 107,345 $ - $ 2 $ 107,343 Short-term investments: Commercial paper $ 14,245 $ - $ 8 $ 14,237 Corporate debt obligations 110,062 - 347 109,715 US government agencies 18,998 2 50 18,950 Bank deposits 10,846 1 - 10,847 Total $ 154,151 $ 3 $ 405 $ 153,749
Summary of Cost and Estimated Fair Value of Short-Term Investments	The following table summarizes the cost and estimated fair value of short-term investments based on stated effective maturities as of June 30, 2017 (in thousands): As of June 30, 2017 Estimated Amortized Fair Cost Value Short-term investments: Due within one year $ 88,396 $ 88,258 Due within two years 84,388 84,202 Total $ 172,784 $ 172,460
Schedule of Short-Term Investments at Fair Value and Length of Continuous Unrealized Loss Position	The following tables show the short-term investments in an unrealized loss position and the related gross unrealized losses and fair value and length of time that the short-term investments have been in a continuous unrealized loss position (in thousands): As of June 30, 2017 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 14,217 $ 11 $ - $ - $ 14,217 $ 11 Corporate debt obligations 89,716 186 50,082 80 139,798 $ 266 US government agencies 9,458 40 5,493 7 14,951 47 Bank deposits 480 1 - - 480 $ 1 $ 113,871 $ 238 $ 55,575 $ 87 $ 169,446 $ 325 As of December 31, 2016 Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 14,237 $ 8 $ - $ - $ 14,237 $ 8 Corporate debt obligations 78,821 323 29,689 24 108,510 $ 347 US government agencies 11,451 46 3,496 4 14,947 50 $ 104,509 $ 377 $ 33,185 $ 28 $ 137,694 $ 405

Fair Value of Financial Instr24

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Subject to Fair Value Measurements on Recurring Basis	The following table sets forth the Company’s assets and liabilities that were measured at fair value as of June 30, 2017 and December 31, 2016, by level within the fair value hierarchy (in thousands): As of June 30, 2017 Level I Level II Level III Fair Financial Assets: Cash equivalents: Commercial paper $ - $ 5,489 $ - $ 5,489 Money market funds 84,359 - - 84,359 Corporate debt obligations - 3,851 - 3,851 Short-term investments: Commercial paper - 14,217 - 14,217 Corporate debt obligations - 142,813 - 142,813 US government agencies - 14,951 - 14,951 Bank deposits - 479 - 479 Prepaid expenses and other current assets - Forward foreign exchange contracts - 2,263 - 2,263 Total financial assets $ 84,359 $ 184,063 $ - $ 268,422 As of December 31, 2016 Level I Level II Level III Fair Value Financial Assets: Cash equivalents: Commercial paper $ - $ 6,993 $ - $ 6,993 Money market funds 36,708 - - 36,708 Short-term investments: Commercial paper - 14,237 - 14,237 Corporate debt obligations - 109,715 - 109,715 US government agencies - 18,950 - 18,950 Bank deposits - 10,847 - 10,847 Total financial assets $ 36,708 $ 160,742 $ - $ 197,450 Financial Liability: Accrued and other current liabilities - Forward foreign exchange contracts $ - $ 639 $ - $ 639

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments Measured at Fair Value and Classification on Condensed Consolidated Balance Sheets	Derivative instruments measured at fair value and their classification on the condensed consolidated balance sheets are presented in the following tables (in thousands): As of June 30, 2017 As of December 31, 2016 Notional Amount Fair Value Notional Amount Fair Value Foreign exchange forward contract derivatives in cash flow hedging relationships - included in prepaid expenses and other current assets (accrued and other current liabilities) $ 27,664 $ 2,696 $ 60,756 $ (639 )
Gains (Losses) on Derivative Instruments and Classification on Condensed Consolidated Statement of Operations	Gains (losses) on derivative instruments and their classification on the condensed consolidated statement of operations are presented in the following table (in thousands): For the three months ended June 30 For the six months ended June 30 2017 2016 2017 2016 Foreign Exchange Forward Contract Derivatives in cash flow hedging relationships: Gains recognized in OCI (a) $ 1,445 $ - $ 4,332 $ 1,316 Losses recognized in OCI (a) $ (17 ) $ (906 ) $ (17 ) $ (1,005 ) Gains recognized from accumulated OCI into net income (b) $ 782 $ 149 $ 988 $ 149 Losses recognized from accumulated OCI into net income (b) $ (5 ) $ (47 ) $ (10 ) $ (241 ) (a) Net change in the fair value of the effective portion classified in other comprehensive income (loss) (“OCI”). (b) Effective portion of cash flow hedges reclassified from accumulated other comprehensive income (loss) into net income, of which $54 and $723 were recognized within cost of sales and operating expenses, respectively, for the three months ended June 30, 2017; $68 and $910 were recognized within cost of sales and operating expenses, respectively, for the six months ended June 30, 2017. $6 and $96 were recognized within cost of sales and operating expenses, respectively, for the three months ended June 30, 2016 and $(7) and $(85) were recognized within cost of sales and operating expenses, respectively, for the six months ended June 30, 2016. All amounts are reflected within the respective condensed consolidated statement of operations.

Goodwill and Acquired Intangi26

Goodwill and Acquired Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in the Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the periods ended June 30, 2017 and December 31, 2016 were as follows (in thousands): Balance as of December 31, 2016 $ 37,448 Goodwill disposed with sale of Skyfence (1,059 ) Balance as of June 30, 2017 $ 36,389
Summary of Acquired Intangible Assets Subject to Amortization	Acquired intangible assets subject to amortization are presented as follows (in thousands): As of June 30, 2017 Gross Carrying Amount Accumulated Amortization Net Book Value Acquired technology $ 3,753 $ (1,004 ) $ 2,749 Customer relationships 480 (38 ) 442 Trade name and other 280 (22 ) 258 Total $ 4,513 $ (1,064 ) $ 3,449 As of December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Book Value Acquired technology $ 11,718 $ (4,085 ) $ 7,633 Customer relationships 480 - 480 Trade name and other 280 - 280 Total $ 12,478 $ (4,085 ) $ 8,393
Schedule of Expected Amortization Expense in Future Periods	As of June 30, 2017, the amortization expense in future periods is expected to be as follows (in thousands): Acquired Fiscal Year Technology 2017 (remaining 6 months) $ 265 2018 528 2019 528 2020 528 2021 528 Thereafter 1,072 Total expected amortization expense $ 3,449

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Payments Under Operating Leases and Minimum Rentals to be Received Under Non-Cancellable Subleases	Future minimum payments under these facility operating leases and minimum rentals to be received under non-cancellable subleases are as follows as of June 30, 2017 (in thousands): Operating Leases Estimated Sublease Income Period Ending December 31: 2017 (remaining 6 months) $ 3,601 $ 356 2018 8,459 683 2019 4,741 - 2020 4,461 - 2021 301 - Thereafter 49 - Total $ 21,612 $ 1,039

Stock Plans (Tables)

Stock Plans (Tables)	6 Months Ended
	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Option Activity under Plans and Related Information	The following table summarizes option activity under the Plans and related information: Options Outstanding Weighted- Average Remaining Number of Shares Weighted Average Exercise Price Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Balances - January 1, 2017 1,570,765 $ 39.64 6.90 $ 9,226 Granted - Exercised (272,676 ) $ 30.63 Cancelled or forfeited (119,002 ) $ 49.77 Balances - June 30, 2017 1,179,087 $ 40.70 6.51 $ 12,754 Vested and expected to vest - June 30, 2017 1,179,087 $ 40.70 6.51 $ 12,754 Exercisable - June 30, 2017 815,232 $ 38.95 6.10 $ 9,919 (1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $47.85 of the Company’s common stock on June 30, 2017.
Summary of RSU Activity Outstanding and Weighted Average Grant Date Fair Value	The following table summarizes RSU activity under the Plans and related information: Number of Restricted Stock Units Outstanding Weighted- Average Grant Date Fair Value Unvested - January 1, 2017 1,994,790 $ 51.42 Granted 1,052,009 $ 42.67 Granted, performance RSUs 301,900 $ 41.96 Released (495,356 ) $ 47.30 Cancelled or forfeited (435,994 ) $ 50.34 Unvested - June 30, 2017 2,417,349 $ 47.47
Stock-Based Compensation Expense	The Company recognized stock-based compensation expense under the 2011 Stock Option and Incentive Plan, 2003 Stock Plan, Inducement Plans, 2011 Employee Stock Purchase Plan, and the Incapsula 2010 Share Incentive Plan in the condensed consolidated statements of operations as follows (in thousands): For the three months ended June 30 For the six months ended June 30 2017 2016 2017 2016 Cost of revenue $ 1,403 $ 1,132 $ 2,672 $ 2,525 Research and development 2,560 3,802 7,328 8,051 Sales and marketing 3,700 7,683 7,166 12,777 General and administrative 3,844 4,487 7,276 9,406 Restructuring charges 0 - 675 - Total stock-based compensation expense $ 11,507 $ 17,104 $ 25,117 $ 32,759
Weighted Average Assumptions for Fair Value of Stock Options Grants and ESPP Grants	The Company did not issue stock option grants for the three months ended June 30, 2017 and 2016 and six months ended June 30, 2017. The fair value of stock option grants for the six months ended June 30, 2016 and ESPP grants for the three and six months ended June 30, 2017 and 2016 was estimated using the following weighted average assumptions: For the three months ended June 30 For the six months ended June 30 2017 2016 2017 2016 Stock option grants: Dividend rate - - - 0 % Risk-free interest rate - - - 1.5 % Expected term (in years) - - - 6.1 Expected volatility - - - 58 % ESPP grants: Dividend rate 0 % 0 % 0 % 0 % Risk-free interest rate 1.1 % 0.4 % 1.1 % 0.4 % Expected term (in years) 0.5 0.5 0.5 0.5 Expected volatility 52 % 58 % 52 % 58 %

Accumulated Other Comprehensi29

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Changes in Balances of Accumulated Other Comprehensive Income (Loss)	The changes in the balances of accumulated other comprehensive income (loss) by component are as follows (in thousands): For the three months ended June 30, 2017 For the three months ended June 30, 2016 Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Balance at April 1 $ 664 $ (385 ) $ 279 $ (105 ) $ (141 ) $ (246 ) Other comprehensive income (loss) before reclassifications 1,196 22 1,218 (552 ) 37 (515 ) Amounts reclassified to net income (loss) (777 ) - (777 ) (102 ) - (102 ) Change in other comprehensive income (loss) 419 22 441 (654 ) 37 (617 ) Balance at June 30 $ 1,083 $ (363 ) $ 720 $ (759 ) $ (104 ) $ (863 ) For the six months ended June 30, 2017 For the six months ended June 30, 2016 Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on investments Total Balance at January 1 $ (1,065 ) $ (413 ) $ (1,478 ) $ (1,021 ) $ (310 ) $ (1,331 ) Other comprehensive income (loss) before reclassifications 3,126 50 3,176 170 206 376 Amounts reclassified to net loss (978 ) - (978 ) 92 - 92 Change in other comprehensive income (loss) 2,148 50 2,198 262 206 468 Balance at June 30 $ 1,083 $ (363 ) $ 720 $ (759 ) $ (104 ) $ (863 )
Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	The following is a summary of reclassifications out of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2017 and 2016 (in thousands): For the three months ended June 30, 2017 For the three months ended June 30, 2016 Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Unrealized gains (losses) on cash flow hedges: Current period unrealized gain (loss) $ 1,428 (232 ) $ 1,196 $ (906 ) 354 $ (552 ) Reclassification adjustments 1 (777 ) - (777 ) (102 ) - (102 ) Unrealized gains (losses) on cash flow hedges, net 651 (232 ) 419 (1,008 ) 354 (654 ) Unrealized gains (losses) on investments: Current period unrealized gain (loss) $ 34 (12 ) 22 $ 57 (20 ) 37 Unrealized gains (losses) on investments: 34 (12 ) 22 57 (20 ) 37 Other comprehensive income (loss) $ 685 $ (244 ) $ 441 $ (951 ) $ 334 $ (617 ) For the six months ended June 30, 2017 For the six months ended June 30, 2016 Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Pre-Tax Amount Tax Expense (Benefit) After-Tax Amount Unrealized gains (losses) on cash flow hedges: Current period unrealized gain (loss) $ 4,315 (1,189 ) $ 3,126 $ 311 (141 ) $ 170 Reclassification adjustments 1 (978 ) - (978 ) 92 92 Unrealized gains (losses) on cash flow hedges, net 3,337 (1,189 ) 2,148 403 (141 ) 262 Unrealized gains (losses) on investments: Current period unrealized gain (loss) $ 78 (28 ) 50 $ 317 (111 ) 206 Unrealized gains (losses) on investments: 78 (28 ) 50 317 (111 ) 206 Other comprehensive income (loss) $ 3,415 $ (1,217 ) $ 2,198 $ 720 $ (252 ) $ 468 1

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Company's Revenue by Geographic Region, Based on Customer's Location	The Company’s net revenue by geographic region, based on the customer’s location, is summarized as follows (in thousands): For the three months ended June 30, For the six months ended June 30, 2017 2016 2017 2016 United States $ 36,701 $ 30,208 $ 74,346 $ 63,879 EMEA 14,842 11,891 28,622 23,175 APAC 14,596 10,640 28,302 21,977 Other 8,296 5,134 15,473 8,615 Total net revenue $ 74,435 $ 57,873 $ 146,743 $ 117,646
Long-Lived Assets by Location	The following table presents long-lived assets by location (in thousands): As of June 30, As of December 31, 2017 2016 United States $ 23,461 $ 20,525 Israel 4,540 9,344 Other 236 20 Total long-lived assets $ 28,237 $ 29,889

Net Income (Loss) per Share (Ta

Net Income (Loss) per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Shares	The table below shows the reconciliation of the basic and diluted shares for the three and six months ended June 30, 2017, in thousands: For the three months ended June 30, For the six months ended June 30, 2017 2016 2017 2016 Weighted average number of shares outstanding: Basic 33,640 32,163 33,425 31,984 Dilutive effects of: Employee stock options, RSU’s and share based payment awards issued to employees - - 559 - Diluted 33,640 32,163 33,984 31,984
Antidilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Share of Common Stock	The following outstanding shares of common stock and potential common shares were excluded from the computation of diluted net income (loss) per share of common stock for the three months ended June 30, 2017 and 2016 because including them would have been antidilutive: For the three months ended June 30, For the six months ended June 30, 2017 2016 2017 2016 Stock options to purchase common stock 1,179,087 1,812,415 670,872 1,812,415 Restricted stock units for common stock 2,417,349 2,454,882 550,544 2,454,882 Restricted stock issued in connection with Skyfence acquisition - 257,847 - 257,847

Disposition of Business (Tables

Disposition of Business (Tables)	6 Months Ended
	Jun. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]
Schedule of Carrying Amounts Immediately Preceding Disposition and Consolidated Results of Operations Through Disposal	The following table presents the carrying amounts of Skyfence immediately preceding the disposition on February 23, 2017: (dollars Assets Prepaid and other current assets $ 46 Property and equipment, net 219 Goodwill 1,058 Acquired intangible assets, net 4,496 Total assets $ 5,819 Liabilities Accounts payable $ 104 Accrued and other current liabilities 117 Deferred revenue 1,454 Total liabilities $ 1,675 The following table presents certain amounts related to Skyfence in our consolidated results of operations through its disposal on February 23, 2017: For June 30, For the six months ended June 30, 2017 2016 2017 2016 (dollars in thousands) (dollars in thousands) Operating loss - $ (3,735 ) $ (3,567 ) $ (8,998 ) Loss before taxes - (3,735 ) (3,648 ) $ (8,998 ) Net loss - (3,821 ) (3,659 ) (9,129 )

Basis of Presentation and Sum33

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Jan. 01, 2017USD ($)	Jun. 30, 2017USD ($)CustomerReseller	Jun. 30, 2016CustomerReseller
Revenue, Major Customer [Line Items]
Number of reseller | Reseller		1	1
Cumulative effect adjustment to accumulated deficit | $		$ 14
ASU 2016-09 [Member]
Revenue, Major Customer [Line Items]
Cumulative effect adjustment to accumulated deficit | $	$ 2,600
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Number of customers representing 10% or more of gross accounts receivable | Customer		0	0
Revenue [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Number of customers representing 10% or more of revenue | Customer		0	0

Basis of Presentation and Sum34

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Percentage of Total Revenue or Gross Accounts Receivable Balance (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Revenue [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance	12.00%	12.00%	12.00%	13.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance			21.00%		18.00%

Cash, Cash Equivalents, and S35

Cash, Cash Equivalents, and Short-Term Investments - Summary of Cash, Cash Equivalents and Short-Term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Cash and cash equivalents, Amortized Cost	$ 147,429	$ 107,345
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	2	2
Cash and cash equivalents, Fair Value	147,427	107,343
Short-term investments, Amortized Cost	172,784	154,151
Short-term investments, Gross Unrealized Gains	1	3
Short-term investments, Gross Unrealized Losses	325	405
Short-term investments, Estimated Fair Value	172,460	153,749	[1]
Cash [Member]
Schedule of Investments [Line Items]
Cash and cash equivalents, Amortized Cost	53,728	63,642
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	0	0
Cash and cash equivalents, Fair Value	53,728	63,642
Commercial Paper [Member]
Schedule of Investments [Line Items]
Cash and cash equivalents, Amortized Cost	5,490	6,995
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	1	2
Cash and cash equivalents, Fair Value	5,489	6,993
Short-term investments, Amortized Cost	14,228	14,245
Short-term investments, Gross Unrealized Gains	0	0
Short-term investments, Gross Unrealized Losses	11	8
Short-term investments, Estimated Fair Value	14,217	14,237
Money Market Funds [Member]
Schedule of Investments [Line Items]
Cash and cash equivalents, Amortized Cost	84,359	36,708
Cash and cash equivalents, Gross Unrealized Gains	0	0
Cash and cash equivalents, Gross Unrealized Losses	0	0
Cash and cash equivalents, Fair Value	84,359	36,708
Corporate Debt Obligations [Member]
Schedule of Investments [Line Items]
Cash and cash equivalents, Amortized Cost	3,852
Cash and cash equivalents, Gross Unrealized Gains	0
Cash and cash equivalents, Gross Unrealized Losses	1
Cash and cash equivalents, Fair Value	3,851
Short-term investments, Amortized Cost	143,078	110,062
Short-term investments, Gross Unrealized Gains	1	0
Short-term investments, Gross Unrealized Losses	266	347
Short-term investments, Estimated Fair Value	142,813	109,715
US Government Agencies [Member]
Schedule of Investments [Line Items]
Short-term investments, Amortized Cost	14,998	18,998
Short-term investments, Gross Unrealized Gains	0	2
Short-term investments, Gross Unrealized Losses	47	50
Short-term investments, Estimated Fair Value	14,951	18,950
Bank Deposits [Member]
Schedule of Investments [Line Items]
Short-term investments, Amortized Cost	480	10,846
Short-term investments, Gross Unrealized Gains	0	1
Short-term investments, Gross Unrealized Losses	1	0
Short-term investments, Estimated Fair Value	$ 479	$ 10,847
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Cash, Cash Equivalents, and S36

Cash, Cash Equivalents, and Short-Term Investments - Summary of Cost and Estimated Fair Value of Short-Term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Short Term Investments [Abstract]
Amortized Cost of short-term investments, Due within one year	$ 88,396
Amortized Cost of short-term investments, Due within two years	84,388
Short-term investments, Amortized Cost	172,784	$ 154,151
Estimated fair value of short-term investments, Due within one year	88,258
Estimated fair value of short-term investments, Due within two years	84,202
Short-term investments, Estimated Fair Value	$ 172,460	$ 153,749	[1]
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Cash, Cash Equivalents, and S37

Cash, Cash Equivalents, and Short-Term Investments - Schedule of Short-Term Investments at Fair Value and Length of Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 113,871	$ 104,509
Less than 12 Months, Unrealized Losses	238	377
12 Months or Greater, Fair Value	55,575	33,185
12 Months or Greater, Unrealized Losses	87	28
Total, Fair Value	169,446	137,694
Total, Unrealized Losses	325	405
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	14,217	14,237
Less than 12 Months, Unrealized Losses	11	8
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	14,217	14,237
Total, Unrealized Losses	11	8
Corporate Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	89,716	78,821
Less than 12 Months, Unrealized Losses	186	323
12 Months or Greater, Fair Value	50,082	29,689
12 Months or Greater, Unrealized Losses	80	24
Total, Fair Value	139,798	108,510
Total, Unrealized Losses	266	347
US Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	9,458	11,451
Less than 12 Months, Unrealized Losses	40	46
12 Months or Greater, Fair Value	5,493	3,496
12 Months or Greater, Unrealized Losses	7	4
Total, Fair Value	14,951	14,947
Total, Unrealized Losses	47	$ 50
Bank Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	480
Less than 12 Months, Unrealized Losses	1
12 Months or Greater, Fair Value	0
12 Months or Greater, Unrealized Losses	0
Total, Fair Value	480
Total, Unrealized Losses	$ 1

Fair Value of Financial Instr38

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value transfers between level 1 to level 2	$ 0	$ 0
Fair value transfers between level 2 to level 1	0	0
Fair value transfers into level 3	0	0
Fair value transfers out of level 3	0	0
Level II [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Severance pay assets	$ 6,300,000	$ 6,300,000	$ 5,100,000

Fair Value of Financial Instr39

Fair Value of Financial Instruments - Assets and Liabilities Subject to Fair Value Measurements on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 147,427	$ 107,343
Short-term investments	172,460	153,749	[1]
Commercial Paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	5,489	6,993
Short-term investments	14,217	14,237
Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	84,359	36,708
Corporate Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	3,851
Short-term investments	142,813	109,715
US Government Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	14,951	18,950
Bank Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	479	10,847
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total financial assets	268,422	197,450
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	5,489	6,993
Short-term investments	14,217	14,237
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	84,359	36,708
Fair Value, Measurements, Recurring [Member] | Corporate Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	3,851
Short-term investments	142,813	109,715
Fair Value, Measurements, Recurring [Member] | US Government Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	14,951	18,950
Fair Value, Measurements, Recurring [Member] | Bank Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	479	10,847
Fair Value, Measurements, Recurring [Member] | Level I [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total financial assets	84,359	36,708
Fair Value, Measurements, Recurring [Member] | Level I [Member] | Commercial Paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level I [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	84,359	36,708
Fair Value, Measurements, Recurring [Member] | Level I [Member] | Corporate Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level I [Member] | US Government Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level I [Member] | Bank Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level II [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total financial assets	184,063	160,742
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Commercial Paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	5,489	6,993
Short-term investments	14,217	14,237
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Corporate Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	3,851
Short-term investments	142,813	109,715
Fair Value, Measurements, Recurring [Member] | Level II [Member] | US Government Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	14,951	18,950
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Bank Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	479	10,847
Fair Value, Measurements, Recurring [Member] | Level III [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total financial assets	0	0
Fair Value, Measurements, Recurring [Member] | Level III [Member] | Commercial Paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level III [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Level III [Member] | Corporate Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level III [Member] | US Government Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Level III [Member] | Bank Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments	0	0
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Prepaid expenses and other current assets - Forward foreign exchange contracts	2,263
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Accrued and Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Accrued and other current liabilities - Forward foreign exchange contracts		639
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Level I [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Prepaid expenses and other current assets - Forward foreign exchange contracts	0
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Level I [Member] | Accrued and Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Accrued and other current liabilities - Forward foreign exchange contracts		0
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Level II [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Prepaid expenses and other current assets - Forward foreign exchange contracts	2,263
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Level II [Member] | Accrued and Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Accrued and other current liabilities - Forward foreign exchange contracts		639
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Level III [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Prepaid expenses and other current assets - Forward foreign exchange contracts	$ 0
Fair Value, Measurements, Recurring [Member] | Forward Foreign Exchange Contracts [Member] | Level III [Member] | Accrued and Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Accrued and other current liabilities - Forward foreign exchange contracts		$ 0
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017
Forward Foreign Exchange Contracts [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative contracts maturity	12 months

Derivative Instruments - Deriva

Derivative Instruments - Derivative Instruments Measured at Fair Value and Classification on Condensed Consolidated Balance Sheets (Detail) - Forward Foreign Exchange Contracts [Member] - Designated As Hedging Instrument [Member] - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	$ 27,664,000	$ 60,756,000
Derivative Fair Value	$ 2,696,000
Accrued and Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Fair Value		$ (639,000)

Derivative Instruments - Gains

Derivative Instruments - Gains (Losses) on Derivative Instruments and Classification on Condensed Consolidated Statement of Operations (Detail) - Designated As Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivatives, Fair Value [Line Items]
Gains recognized in OCI	$ 1,445	$ 0	$ 4,332	$ 1,316
Losses recognized in OCI	(17)	(906)	(17)	(1,005)
Gains recognized from accumulated OCI into net income	782	149	988	149
Losses recognized from accumulated OCI into net income	$ (5)	$ (47)	$ (10)	$ (241)

Derivative Instruments - Gain43

Derivative Instruments - Gains (Losses) on Derivative Instruments and Classification on Condensed Consolidated Statement of Operations (Parenthetical) (Detail) - Designated As Hedging Instrument [Member] - Unrealized Gain (Loss) on Cash Flow Hedges [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Cash flow hedge Gain (loss) reclassified	$ 54	$ 6	$ 68	$ (7)
Operating Expenses [Member]
Derivatives, Fair Value [Line Items]
Cash flow hedge Gain (loss) reclassified	$ 723	$ 96	$ 910	$ (85)

Goodwill and Acquired Intangi44

Goodwill and Acquired Intangible Assets - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Finite Lived Intangible Assets [Line Items]
Goodwill allocated to disposal of assets				$ 1,059,000
Goodwill impairments		$ 0	$ 0	0	$ 0
Impairment of intangible assets		$ 0	$ 0	$ 0	$ 0
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life				7 years
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life				10 years
Acquired Technology [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life				6 years 6 months
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life				6 years 6 months
Trade Name and Other [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life				6 years 6 months
Skyfence Cloud Access Security Broker Business [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill allocated to disposal of assets	$ 1,100,000
Intangible assets derecognized in connection with disposal of assets	$ 4,500,000

Goodwill and Acquired Intangi45

Goodwill and Acquired Intangible Assets - Changes in the Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance as of December 31, 2016	$ 37,448	[1]
Goodwill disposed with sale of Skyfence	(1,059)
Balance as of June 30, 2017	$ 36,389
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Goodwill and Acquired Intangi46

Goodwill and Acquired Intangible Assets - Summary of Acquired Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,513	$ 12,478
Accumulated Amortization	(1,064)	(4,085)
Net Book Value	3,449	8,393	[1]
Acquired Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,753	11,718
Accumulated Amortization	(1,004)	(4,085)
Net Book Value	2,749	7,633
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	480	480
Accumulated Amortization	(38)	0
Net Book Value	442	480
Trade Name and Other [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	280	280
Accumulated Amortization	(22)	0
Net Book Value	$ 258	$ 280
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Goodwill and Acquired Intangi47

Goodwill and Acquired Intangible Assets - Schedule of Expected Amortization Expense in Future Periods (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	[1]
Goodwill And Intangible Assets Disclosure [Abstract]
2017 (remaining 6 months)	$ 265
2,018	528
2,019	528
2,020	528
2,021	528
Thereafter	1,072
Net Book Value	$ 3,449	$ 8,393
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Loss Contingencies [Line Items]
Operating lease expiration year	2,022
Rent expense	$ 3,200,000	$ 3,000,000
Tenant improvement allowances	0	0
Restricted cash	2,054,000		$ 1,884,000	[1]
Purchase commitments	$ 3,400,000		3,800,000
Period of purchase commitment of inventory from specified date	6 months
Loss contingency accrual	$ 0		$ 0
Cancelable Lease Agreement [Member]
Loss Contingencies [Line Items]
Motor vehicle lease expenses	1,500,000	$ 1,400,000
Maximum [Member] | Cancelable Lease Agreement [Member]
Loss Contingencies [Line Items]
Penalties	$ 100,000
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Commitments and Contingencies49

Commitments and Contingencies - Future Minimum Payments Under Operating Leases and Minimum Rentals to be Received Under Non-Cancellable Subleases (Detail) $ in Thousands	Jun. 30, 2017USD ($)
Operating Leases
2017 (remaining 6 months)	$ 3,601
2,018	8,459
2,019	4,741
2,020	4,461
2,021	301
Thereafter	49
Total	21,612
Estimated Sublease Income
2017 (remaining 6 months)	356
2,018	683
2,019	0
2,020	0
2,021	0
Thereafter	0
Total	$ 1,039

Stock Plans - Additional Inform

Stock Plans - Additional Information (Detail)

Apr. 26, 2017shares

Jan. 01, 2017shares

May 31, 2016shares

Oct. 31, 2015shares

Aug. 31, 2014shares

Nov. 30, 2013shares

Jan. 31, 2012

Sep. 30, 2011Periodshares

Jun. 30, 2017USD ($)Executiveshares

Jun. 30, 2016USD ($)shares

Jun. 30, 2017USD ($)Executiveshares

Jun. 30, 2016USD ($)

Dec. 31, 2016shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Performance-based restricted stock units granted

1,052,009

Number of stock option outstanding, granted

0

0

0

Number of options outstanding

1,179,087

1,179,087

1,570,765

Number of restricted stock units outstanding

2,417,349

2,417,349

1,994,790

Intrinsic value of options exercised | $

$ 4,200,000

Compensation cost related to unvested stock-based awards granted, but not yet recognized | $

$ 97,200,000

$ 97,200,000

Nonvested awards, compensation cost not yet recognized, period for recognition

2 years 8 months 12 days

Capitalized stock-based compensation expense | $

$ 0

$ 0

$ 0

$ 0

Restricted Stock Units for Common Stock [Member] | Incapsula [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares issuable, as-converted to common stock-basis

198,825

Performance-based RSUs [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of executives | Executive

2

2

Restricted Stock Units And Outstanding Options [Member] | Incapsula [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares issuable, as-converted to common stock-basis

247,184

2003 Stock Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Reserve of common stock for future issuance

955,568

955,568

2003 Stock Plan [Member] | Stock options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Maximum percentage of fair value of common stock on grant date

85.00%

2003 Stock Plan [Member] | Stock options [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expiration period

10 years

2003 Stock Plan [Member] | Stock options [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period

4 years

2003 Stock Plan [Member] | Stock options [Member] | Greater 10% Ownership [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Maximum percentage of fair value of common stock on grant date

110.00%

Minimum percentage of combined voting power

10.00%

2011 Stock Option and Incentive Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Reserve of common stock for future issuance

1,000,000

Increase percentage of common stock outstanding

4.00%

Increase in reserve share

850,000

1,300,000

2011 Stock Option and Incentive Plan [Member] | Stock options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Maximum percentage of fair value of common stock on grant date

100.00%

Expiration period

10 years

2011 Stock Option and Incentive Plan [Member] | Restricted Stock Units for Common Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period

4 years

Description of vesting terms

The Company also grants RSUs. RSUs granted to new hires and merit grants to existing employees generally vest over a four-year period with 25% vesting at the end of one year and the remainder vesting quarterly thereafter.

2011 Stock Option and Incentive Plan [Member] | Restricted Stock Units for Common Stock [Member] | Share-based Compensation Award, Tranche One [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting percentage at the end of period

25.00%

2011 Stock Option and Incentive Plan [Member] | Performance-based RSUs [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting period

3 years

Vesting performance period

1 year

Vesting service period

2 years

Description of vesting terms

The PRSUs provide for a target number of shares that generally vest over three years including a one year performance period and two years of service-based vesting. The PRSUs vest contingent upon the Company’s achievement of an annual contract value of subscription bookings target for fiscal 2017 and total operating expenses for 2017 that are at 110% or less of the internal operating plan.

Vest contingent upon the company’s achievement of total operating expenses at the internal operating plan, percentage

110.00%

Award expiration date

Feb. 15, 2019

2011 Stock Option and Incentive Plan [Member] | Performance-based RSUs [Member] | Executives [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Performance-based restricted stock units granted

46,619

2011 Stock Option and Incentive Plan [Member] | Performance-based RSUs [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Earned percentage on target award amount, depending on level of achievement

200.00%

2011 Stock Option and Incentive Plan [Member] | Performance-based RSUs [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Earned percentage on target award amount, depending on level of achievement

0.00%

2011 Employee Stock Purchase Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Reserve of common stock for future issuance

500,000

Increase percentage of common stock outstanding

1.00%

Increase in reserve share

330,889

Program effective date

Nov. 8, 2011

Percentage in payroll of deduction base salary to acquire shares of common stock

15.00%

Offering period

24 months

Percentage of fair value of common stock on offering period

85.00%

Number of years, shares reserved for issuance increase

8 years

2011 Employee Stock Purchase Plan [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Reserve of common stock for future issuance

20,000,000

Number of purchase periods for offering | Period

5

Inducement Stock Option Plan And Agreement [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Description of vesting terms

In accordance with the terms of the Inducement Option Plans, the Company issued options to purchase an aggregate of 290,000 shares of the Company’s common stock at an exercise price equal to the fair market value of a share of the Company’s common stock on the dates of grant of the options. The options, which have a ten-year term, vest at the rate of 25% of the shares on each of the first anniversary of the vesting commencement date with an additional 6.25% of the shares subject to the option vesting each quarter thereafter so long as the participant has not been terminated.

Number of stock option outstanding, granted

290,000

Inducement Stock Option Plan And Agreement [Member] | Share-based Compensation Award, Tranche One [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting percentage at the end of period

25.00%

Inducement Stock Option Plan And Agreement [Member] | Quarterly Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting percentage at the end of period

6.25%

Inducement Restricted Stock Unit Plan and Agreement [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Description of vesting terms

In accordance with the terms of the Inducement RSU Plans, the Company issued RSUs representing an aggregate of 290,000 shares of the Company’s common stock. The RSUs, which expire following settlement, vest at the rate of 25% of the shares on each of the first anniversary of the vesting commencement date with an additional 6.25% of the shares subject to the RSU vesting each quarter thereafter so long as the participant has not been terminated.

Shares available for grant

290,000

Inducement Restricted Stock Unit Plan and Agreement [Member] | Share-based Compensation Award, Tranche One [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting percentage at the end of period

25.00%

Inducement Restricted Stock Unit Plan and Agreement [Member] | Quarterly Vesting [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting percentage at the end of period

6.25%

2015 Equity Inducement Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Reserve of common stock for future issuance

100,000

2015 Equity Inducement Plan [Member] | Stock options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Maximum percentage of fair value of common stock on grant date

100.00%

Expiration period

10 years

Incapsula 2010 Share Incentive Plan [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Reserve of common stock for future issuance

10,263,211

Incapsula 2010 Share Incentive Plan [Member] | Restricted Stock Units for Common Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Performance-based restricted stock units granted

7,095,461

Incapsula 2010 Share Incentive Plan [Member] | Assumed Outstanding Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of options outstanding

4,348

4,348

Incapsula 2010 Share Incentive Plan [Member] | Assumed RSUs Outstanding [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of restricted stock units outstanding

118

118

Stock Plans - Summary of Option

Stock Plans - Summary of Option Activity under Plans and Related Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options Outstanding, Beginning balance			1,570,765
Number of Stock Options Outstanding, Granted	0	0	0
Number of Stock Options Outstanding, Exercised			(272,676)
Number of Stock Options Outstanding, Cancelled or forfeited			(119,002)
Number of Stock Options Outstanding, Ending balance	1,179,087		1,179,087	1,570,765
Number of Shares, Vested and expected to vest	1,179,087		1,179,087
Number of Shares, Exercisable	815,232		815,232
Weighted Average Exercise Price of Stock Options Outstanding	$ 40.70		$ 40.70	$ 39.64
Weighted Average Exercise Price, Granted			0
Weighted Average Exercise Price, Exercised			30.63
Weighted Average Exercise Price, Cancelled or forfeited			49.77
Weighted Average Exercise Price, Vested and expected to vest	40.70		40.70
Weighted Average Exercise Price, Exercisable	$ 38.95		$ 38.95
Weighted-Average Remaining Contractual Term (in years)			6 years 6 months 3 days	6 years 10 months 25 days
Weighted-Average Remaining Contractual Term (in years), Vested and expected to vest			6 years 6 months 3 days
Weighted-Average Remaining Contractual Term (in years), Exercisable			6 years 1 month 6 days
Aggregate Intrinsic Value	$ 12,754		$ 12,754	$ 9,226
Aggregate Intrinsic Value, Vested and expected to vest	12,754		12,754
Aggregate Intrinsic Value, Exercisable	$ 9,919		$ 9,919

Stock Plans - Summary of Opti52

Stock Plans - Summary of Option Activity under Plans and Related Information (Parenthetical) (Detail)	Jun. 30, 2017$ / shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Closing stock price	$ 47.85

Stock Plans - Summary of RSU Ac

Stock Plans - Summary of RSU Activity Outstanding and Weighted Average Grant Date Fair Value (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Restricted Stock Units Outstanding, Unvested - Beginning Balance	1,994,790
Number of Restricted Stock Units Outstanding, Granted	1,052,009
Number of Restricted Stock Units Outstanding, Granted, performance RSUs	301,900
Number of Restricted Stock Units Outstanding, Released	(495,356)
Number of Restricted Stock Units Outstanding, Cancelled or forfeited	(435,994)
Number of Restricted Stock Units Outstanding, Unvested - Ending Balance	2,417,349
Weighted-Average Grant Date Fair Value, Unvested	$ 47.47	$ 51.42
Weighted-Average Grant Date Fair Value, Granted	42.67
Weighted-Average Grant Date Fair Value, Granted, performance RSUs	41.96
Weighted-Average Grant Date Fair Value, Released	47.30
Weighted-Average Grant Date Fair Value, Cancelled or forfeited	$ 50.34

Stock Plans - Stock-Based Compe

Stock Plans - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 11,507	$ 17,104	$ 25,117	$ 32,759
Cost of revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,403	1,132	2,672	2,525
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2,560	3,802	7,328	8,051
Sales and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	3,700	7,683	7,166	12,777
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	3,844	4,487	7,276	9,406
Restructuring Charges [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 0	$ 0	$ 675	$ 0

Stock Plans - Weighted Average

Stock Plans - Weighted Average Assumptions for Fair Value of Stock Options Grants and ESPP Grants (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	0.00%	0.00%	0.00%	1.50%
Expected term (in years)	0 years	0 years	0 years	6 years 1 month 6 days
Expected volatility	0.00%	0.00%	0.00%	58.00%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	1.10%	0.40%	1.10%	0.40%
Expected term (in years)	6 months	6 months	6 months	6 months
Expected volatility	52.00%	58.00%	52.00%	58.00%

Accumulated Other Comprehensi56

Accumulated Other Comprehensive Income (Loss) - Changes in Balances of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 231,963	[1]	$ 240,201
Other comprehensive income (loss) before reclassifications	$ 1,218	$ (515)	3,176		376
Amounts reclassified to net income (loss)	(777)	(102)	(978)		92
Other comprehensive income (loss)	441	(617)	2,198		468
Ending balance	287,115	223,295	287,115		223,295
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	664	(105)	(1,065)		(1,021)
Other comprehensive income (loss) before reclassifications	1,196	(552)	3,126		170
Amounts reclassified to net income (loss)	(777)	(102)	(978)		92
Other comprehensive income (loss)	419	(654)	2,148		262
Ending balance	1,083	(759)	1,083		(759)
Unrealized Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(385)	(141)	(413)		(310)
Other comprehensive income (loss) before reclassifications	22	37	50		206
Amounts reclassified to net income (loss)	0	0	0		0
Other comprehensive income (loss)	22	37	50		206
Ending balance	(363)	(104)	(363)		(104)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	279	(246)	(1,478)		(1,331)
Ending balance	$ 720	$ (863)	$ 720		$ (863)
[1]	The Condensed Consolidated Balance Sheet as of December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

Accumulated Other Comprehensi57

Accumulated Other Comprehensive Income (Loss) - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Pre-Tax Amount	$ 685	$ (951)	$ 3,415	$ 720
Other comprehensive income (loss), Tax Expense (Benefit)	(244)	334	(1,217)	(252)
Other comprehensive income (loss) before reclassification adjustments, After-Tax Amount	1,218	(515)	3,176	376
Other comprehensive income (loss), Reclassification adjustments, After-Tax Amount	(777)	(102)	(978)	92
Other comprehensive income (loss)	441	(617)	2,198	468
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassification adjustments, Pre-Tax Amount	1,428	(906)	4,315	311
Other comprehensive income (loss), Reclassification adjustments, Pre-Tax Amount	(777)	(102)	(978)	92
Other comprehensive income (loss), Pre-Tax Amount	651	(1,008)	3,337	403
Other comprehensive income (loss) before reclassification adjustments, Tax Expense (Benefit)	(232)	354	(1,189)	(141)
Other comprehensive income (loss), Reclassification adjustments, Tax Expense (Benefit)	0	0	0	0
Other comprehensive income (loss), Tax Expense (Benefit)	(232)	354	(1,189)	(141)
Other comprehensive income (loss) before reclassification adjustments, After-Tax Amount	1,196	(552)	3,126	170
Other comprehensive income (loss), Reclassification adjustments, After-Tax Amount	(777)	(102)	(978)	92
Other comprehensive income (loss)	419	(654)	2,148	262
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassification adjustments, Pre-Tax Amount	34	57	78	317
Other comprehensive income (loss), Pre-Tax Amount	34	57	78	317
Other comprehensive income (loss) before reclassification adjustments, Tax Expense (Benefit)	(12)	(20)	(28)	(111)
Other comprehensive income (loss), Tax Expense (Benefit)	(12)	(20)	(28)	(111)
Other comprehensive income (loss) before reclassification adjustments, After-Tax Amount	22	37	50	206
Other comprehensive income (loss), Reclassification adjustments, After-Tax Amount	0	0	0	0
Other comprehensive income (loss)	$ 22	$ 37	$ 50	$ 206

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Expenses [Line Items]
Income tax expense (benefit)	$ (914)	$ 681	$ 44	$ 579
Maximum [Member]
Income Tax Expenses [Line Items]
Income tax expense (benefit)			$ 100	$ 600

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017Segment
Segment Reporting [Abstract]
Number of operating segments	1

Segment Information - Company's

Segment Information - Company's Revenue by Geographic Region, Based on Customer's Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 74,435	$ 57,873	$ 146,743	$ 117,646
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	36,701	30,208	74,346	63,879
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	14,842	11,891	28,622	23,175
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	14,596	10,640	28,302	21,977
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 8,296	$ 5,134	$ 15,473	$ 8,615

Segment Information - Long-Live

Segment Information - Long-Lived Assets by Location (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 28,237	$ 29,889
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	23,461	20,525
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	4,540	9,344
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 236	$ 20

Restructuring Charges - Additio

Restructuring Charges - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring And Related Activities [Abstract]
Restructuring plan approval date by board of directors			2016-11
Restructuring charges	$ 0	$ 0	$ 667,000	$ 0
Payments for restructuring charges	$ 0		$ 1,100,000

Net Income (Loss) per Share - R

Net Income (Loss) per Share - Reconciliation of Basic and Diluted Shares (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Weighted average number of shares outstanding:
Basic	33,640	32,163	33,425	31,984
Dilutive effects of:
Employee stock options, RSU’s and share based payment awards issued to employees	0	0	559	0
Diluted	33,640	32,163	33,984	31,984

Net Income (Loss) per Share - A

Net Income (Loss) per Share - Antidilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Share of Common Stock (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	1,179,087	1,812,415	670,872	1,812,415
Restricted Stock Units for Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	2,417,349	2,454,882	550,544	2,454,882
Restricted Stock Issued In Connection with Skyfence Acquisition [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	0	257,847	0	257,847

Disposition of Business - Addit

Disposition of Business - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Feb. 23, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Recognized gain on sale of Skyfence	$ 0		$ 0	$ 35,871	$ 0
Skyfence Cloud Access Security Broker Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash consideration on sale of assets						$ 40,000
Escrow to secure indemnification obligations						$ 5,000
Recognized gain on sale of Skyfence		$ 35,900

Disposition of Business - Sched

Disposition of Business - Schedule of Carrying Amounts Immediately Preceding Disposition (Detail) - Skyfence Networks Ltd. [Member] $ in Thousands	Feb. 23, 2017USD ($)
Assets
Prepaid and other current assets	$ 46
Property and equipment, net	219
Goodwill	1,058
Acquired intangible assets, net	4,496
Total assets	5,819
Liabilities
Accounts payable	104
Accrued and other current liabilities	117
Deferred revenue	1,454
Total liabilities	$ 1,675

Disposition of Business - Sch67

Disposition of Business - Schedule of Consolidated Results of Operations Through Disposal (Detail) - Skyfence Cloud Access Security Broker Business [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Operating loss	$ 0	$ (3,735)	$ (3,567)	$ (8,998)
Loss before taxes	0	(3,735)	(3,648)	(8,998)
Net loss	$ 0	$ (3,821)	$ (3,659)	$ (9,129)