Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands	Total USD ($)	Acquisition of Rhozet [Member] USD ($)	Acquisition of Omneon [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] Acquisition of Rhozet [Member]	Common Stock [Member] Acquisition of Omneon [Member] USD ($)	Capital in Excess of Par Values [Member] USD ($)	Capital in Excess of Par Values [Member] Acquisition of Rhozet [Member] USD ($)	Capital in Excess of Par Values [Member] Acquisition of Omneon [Member] USD ($)	Accumulated Deficit [Member] USD ($)	Accumulated Other Comprehensive Income Loss [Member] USD ($)	Comprehensive Income (Loss) [Member] USD ($)
Beginning Balance at Dec. 31, 2008	$ 414,317			$ 95			$ 2,263,236			$ (1,848,394)	$ (620)
Beginning Balance, Shares at Dec. 31, 2008				95,017
Net income (loss)	(24,139)									(24,139)		(24,139)
Unrealized gain (loss) on investments, net of tax	529										529	529
Currency translation	56										56	56
Comprehensive loss												(23,554)
Stock-based compensation	10,597						10,597
Issuance of Common Stock under option, stock award and purchase plans	4,243			1			4,242
Issuance of Common Stock under option, stock award and purchase plans, Shares				892
Issuance of Common Stock for acquisition of Rhozet and Omneon		1,870						1,870
Issuance of Common Stock for acquisition of Rhozet and Omneon, Shares					201
Ending Balance at Dec. 31, 2009	407,473			96			2,279,945			(1,872,533)	(35)
Ending Balance, Shares at Dec. 31, 2009				96,110
Net income (loss)	(4,335)									(4,335)		(4,335)
Unrealized gain (loss) on investments, net of tax	(376)										(376)	(376)
Currency translation	(301)										(301)	(301)
Comprehensive loss												(5,012)
Stock-based compensation	15,549						15,549
Issuance of Common Stock under option, stock award and purchase plans	3,859			2			3,857
Issuance of Common Stock under option, stock award and purchase plans, Shares				2,100
Issuance of Common Stock for acquisition of Rhozet and Omneon			98,063			14			98,049
Issuance of Common Stock for acquisition of Rhozet and Omneon, Shares						14,150
Excess tax benefits from stock-based compensation	271						271
Ending Balance at Dec. 31, 2010	520,203			112			2,397,671			(1,876,868)	(712)
Ending Balance, Shares at Dec. 31, 2010				112,360
Net income (loss)	8,779									8,779		8,779
Unrealized gain (loss) on investments, net of tax	10										10	10
Currency translation	(173)										(173)	(173)
Comprehensive loss												8,616
Stock-based compensation	20,841						20,841
Issuance of Common Stock under option, stock award and purchase plans	12,701			4			12,697
Issuance of Common Stock under option, stock award and purchase plans, Shares				3,897
Excess tax benefits from stock-based compensation	1,955						1,955
Ending Balance at Dec. 31, 2011	$ 564,316			$ 116			$ 2,433,164			$ (1,868,089)	$ (875)
Ending Balance, Shares at Dec. 31, 2011				116,257