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 related to acquisitions								358				(358)
Issuance of common stock, net of repurchases	4,674					4,674
Issuance of common stock, net of repurchases, shares				655,433
Vesting of restricted stock	600					600
Stock-based compensation	9,858					9,858
Exercise of warrant				7,694
Components of other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on investments	(183)									(183)
Change in unrealized gain (loss) on derivatives	(425)									(425)
Net loss	(16,160)								(15,749)		(411)
Comprehensive loss	(16,768)
Ending balance at Sep. 30, 2013	82,595			2		173,479			(89,266)	253	(1,873)
Ending balance, shares at Sep. 30, 2013				24,959,203
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				738,479	89,603
Issuance of common stock, net of repurchases	3,498					3,498
Issuance of common stock, net of repurchases, shares				548,197
Vesting of restricted stock	427					427
Stock-based compensation	26,106					26,106
Income tax benefit from employee stock option exercises	20					20
Components of other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on investments	(16)									(16)
Change in unrealized gain (loss) on derivatives	(419)									(419)
Net loss	(46,680)								(46,467)		(213)
Comprehensive loss	(47,115)
Ending balance at Sep. 30, 2014	$ 93,676			$ 2		$ 239,699			$ (145,162)	$ (863)
Ending balance, shares at Sep. 30, 2014				26,582,777

[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.