Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total		Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Convertible Preferred Stock
Beginning balance at Dec. 31, 2010	$ (52,419)		$ 1	$ 3,340	$ (55,861)	$ 452	$ (351)	$ 53,442
Beginning balance, shares at Dec. 31, 2010			6,143,018					10,761,511
Issuance of common stock upon exercise of stock options	542			542
Issuance of common stock upon exercise of stock options, shares			357,166
Issuance of common stock upon early exercise of stock awards			90,000
Vesting of restricted stock	708			708
Stock-based compensation	1,154			1,154
Purchase of additional ownership interest in Incapsula, Inc.				(167)			167
Components of other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on investments	(2)					(2)
Change in unrealized gain (loss) on derivatives	(810)					(810)
Net loss	(9,231)				(8,773)		(458)
Comprehensive loss	(10,043)
Ending balance at Sep. 30, 2011	(60,058)		1	5,577	(64,634)	(360)	(642)	53,442
Ending balance, shares at Sep. 30, 2011			6,590,184					10,761,511
Beginning balance at Dec. 31, 2011	79,568	[1]	2	147,085	(66,130)	(616)	(773)
Beginning balance, shares at Dec. 31, 2011			22,978,166
Issuance of common stock upon exercise of stock options	2,140			2,140
Issuance of common stock upon exercise of stock options, shares			1,059,805
Vesting of restricted stock	681			681
Stock-based compensation	3,596			3,596
Purchase of additional ownership interest in Incapsula, Inc.				(174)			174
Components of other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on investments	186					186
Change in unrealized gain (loss) on derivatives	462					462
Net loss	(7,030)				(6,663)		(367)
Comprehensive loss	(6,382)
Ending balance at Sep. 30, 2012	$ 79,603		$ 2	$ 153,328	$ (72,793)	$ 32	$ (966)
Ending balance, shares at Sep. 30, 2012			24,037,971

[1] The Condensed Consolidated Balance Sheet as of December 31, 2011 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.