Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue	$ 238,091	$ 213,813	$ 196,519
Cost of revenue	110,190	100,665	94,925
Gross profit	127,901	113,148	101,594
Operating expenses:
Research and development	49,733	48,796	44,518
Selling, general and administrative	54,624	50,018	40,280
Litigation expense (benefit), net	(371)	(2,945)	3,379
Total operating expenses	103,986	95,869	88,177
Income from operations	23,915	17,279	13,417
Interest and other income, net	92	611	309
Income before income taxes	24,007	17,890	13,726
Income tax provision	1,109	2,134	425
Net income	$ 22,898	$ 15,756	$ 13,301
Basic net income per share (in Dollars per share)	$ 0.61	$ 0.45	$ 0.39
Diluted net income per share (in Dollars per share)	$ 0.59	$ 0.43	$ 0.38
Weighted average common shares outstanding:
Basic (in Shares)	37,387	34,871	34,050
Diluted (in Shares)	38,620	36,247	35,160