Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Revenue	$ 58,607		$ 51,628		$ 109,091		$ 96,096
Cost of revenue (1)	27,435	[1]	25,070	[1]	51,509	[1]	47,233	[1]
Gross profit	31,172		26,558		57,582		48,863
Research and development (2)	12,468	[1]	11,237	[1]	23,586	[1]	21,323	[1]
Selling, general and administrative (3)	12,167	[1]	10,343	[1]	24,133	[1]	19,833	[1]
Litigation expense (benefit)	(244)		939		(116)		1,752
Total operating expenses	24,391		22,519		47,603		42,908
Income from operations	6,781		4,039		9,979		5,955
Interest income and other, net	359		24		465		207
Income before income taxes	7,140		4,063		10,444		6,162
Income tax provision	548		581		857		787
Net income	6,592		3,482		9,587		5,375
Basic net income per share (in Dollars per share)	$ 0.19		$ 0.10		$ 0.28		$ 0.16
Diluted net income per share (in Dollars per share)	$ 0.18		$ 0.10		$ 0.27		$ 0.15
Basic (in Shares)	34,665		33,846		34,385		34,432
Diluted (in Shares)	35,997		34,903		35,660		35,598
Stock-based Compensation Expense	3,829		3,675		7,144		6,662
Cost of Sales [Member]
Stock-based Compensation Expense	118		89		213		152
Research and Development [Member]
Stock-based Compensation Expense	1,524		1,550		2,790		2,977
Selling, General And Administrative [Member]
Stock-based Compensation Expense	$ 2,187		$ 2,036		$ 4,141		$ 3,533

[1] Includes stock-based compensation expense