Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)		SkyFence Networks, Ltd. [Member] USD ($)	Common stock [Member] USD ($)	Common stock [Member] Incapsula [Member]	Additional paid-in capital [Member] USD ($)	Additional paid-in capital [Member] SkyFence Networks, Ltd. [Member] USD ($)	Additional paid-in capital [Member] Incapsula [Member] USD ($)	Accumulated deficit [Member] USD ($)	Accumulated other comprehensive income (loss) [Member] USD ($)	Noncontrolling interest [Member] USD ($)	Noncontrolling interest [Member] Incapsula [Member] USD ($)
Beginning balance at Dec. 31, 2012	$ 84,231			$ 2		$ 157,989			$ (73,517)	$ 861	$ (1,104)
Beginning balance, shares at Dec. 31, 2012				24,296,076
Issuance of common stock, net of repurchases	628					628
Issuance of common stock, net of repurchases, shares				221,508
Vesting of restricted stock	200					200
Stock-based compensation	2,853					2,853
Components of other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on investments	(67)									(67)
Change in unrealized gain (loss) on derivatives	137									137
Net loss	(6,195)								(6,059)		(136)
Comprehensive loss	(6,125)
Ending balance at Mar. 31, 2013	81,787			2		161,670			(79,576)	931	(1,240)
Ending balance, shares at Mar. 31, 2013				24,517,584
Beginning balance at Dec. 31, 2013	86,222	[1]		2		187,957			(98,695)	(428)	(2,614)
Beginning balance, shares at Dec. 31, 2013				25,206,498
Issuance of common stock related to acquisitions	24,164		354			24,164	354	(2,827)				2,827
Issuance of common stock related to acquisitions, shares				737,523	89,603
Issuance of common stock, net of repurchases	1,289					1,289
Issuance of common stock, net of repurchases, shares				254,795
Vesting of restricted stock	200					200
Stock-based compensation	6,666					6,666
Components of other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on investments	3									3
Net loss	(17,624)								(17,411)		(213)
Comprehensive loss	(17,621)
Ending balance at Mar. 31, 2014	$ 101,274			$ 2		$ 217,803			$ (116,106)	$ (425)
Ending balance, shares at Mar. 31, 2014				26,288,419

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 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.