Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Revenue	$ 57,714,000		$ 58,607,000		$ 109,184,000		$ 109,091,000
Cost of revenue (1)	26,786,000	[1]	27,435,000	[1]	50,871,000		51,509,000
Gross profit	30,928,000		31,172,000		58,313,000		57,582,000
Operating expenses:
Research and development (1)	12,478,000	[1]	12,468,000	[1]	24,601,000	[1]	23,586,000	[1]
Selling, general and administrative (1)	13,793,000	[1]	12,167,000	[1]	27,051,000	[1]	24,133,000	[1]
Litigation benefit	(257,000)		(244,000)		(558,000)		(116,000)
Total operating expenses	26,014,000		24,391,000		51,094,000		47,603,000
Income from operations	4,914,000		6,781,000		7,219,000		9,979,000
Interest and other income, net	218,000		359,000		208,000		465,000
Income before income taxes	5,132,000		7,140,000		7,427,000		10,444,000
Income tax provision (benefit)	(357,000)		548,000		(562,000)		857,000
Net income	5,489,000		6,592,000		7,989,000		9,587,000
Basic net income per share (in Dollars per share)	$ 0.15		$ 0.19		$ 0.22		$ 0.28
Diluted net income per share (in Dollars per share)	$ 0.14		$ 0.18		$ 0.21		$ 0.27
Weighted average common shares outstanding:
Basic (in Shares)	37,053		34,665		36,657		34,385
Diluted (in Shares)	38,239		35,997		38,019		35,660
(1) Includes stock-based compensation expense as follows:
Stock-based compensation	5,190,000		3,829,000		9,850,000		7,144,000
Cost Of Revenue [Member]
(1) Includes stock-based compensation expense as follows:
Stock-based compensation	146,000		118,000		302,000		213,000
Research and Development [Member]
(1) Includes stock-based compensation expense as follows:
Stock-based compensation	1,693,000		1,524,000		3,066,000		2,790,000
Selling, General And Administrative [Member]
(1) Includes stock-based compensation expense as follows:
Stock-based compensation	$ 3,351,000		$ 2,187,000		$ 6,482,000		$ 4,141,000

[1] (1) Includes stock-based compensation expense