Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Revenue	$ 56,508		$ 52,962		$ 165,599		$ 149,058
Cost of revenue (1)	26,495	[1]	25,148	[1]	78,004	[1]	72,381	[1]
Gross profit	30,013		27,814		87,595		76,677
Operating expenses:
Research and development (2)	11,967	[2]	11,792	[2]	35,553	[2]	33,115	[2]
Selling, general and administrative (3)	11,955	[3]	10,249	[3]	36,088	[3]	30,082	[3]
Litigation expense (benefit), net	(229)		722		(345)		2,474
Total operating expenses	23,693		22,763		71,296		65,671
Income from operations	6,320		5,051		16,299		11,006
Interest income and other, net	156		3		621		210
Income before income taxes	6,476		5,054		16,920		11,216
Income tax provision (benefit)	555		(419)		1,412		368
Net income	$ 5,921		$ 5,473		$ 15,508		$ 10,848
Basic net income per share (in Dollars per share)	$ 0.17		$ 0.16		$ 0.45		$ 0.32
Diluted net income per share (in Dollars per share)	$ 0.16		$ 0.16		$ 0.43		$ 0.31
Weighted average common shares outstanding:
Basic (in Shares)	35,145		33,594		34,677		34,149
Diluted (in Shares)	36,438		34,240		36,008		35,275

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

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

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