Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue	$ 81,416	$ 68,436	$ 154,954	$ 128,497
Cost of revenue	37,287	31,337	71,142	59,301
Gross profit	44,129	37,099	83,812	69,196
Operating expenses:
Research and development	15,743	13,368	31,781	28,971
Selling, general and administrative	17,964	16,853	35,482	32,962
Litigation expense (benefit), net	311	274	581	(8,426)
Total operating expenses	34,018	30,495	67,844	53,507
Income from operations	10,111	6,604	15,968	15,689
Interest and other income, net	235	295	877	485
Income before income taxes	10,346	6,899	16,845	16,174
Income tax provision	2,447	502	2,983	759
Net income	$ 7,899	$ 6,397	$ 13,862	$ 15,415
Net income per share:
Basic (in Dollars per share)	$ 0.20	$ 0.17	$ 0.35	$ 0.40
Diluted (in Dollars per share)	$ 0.19	$ 0.16	$ 0.34	$ 0.39
Weighted-average shares outstanding:
Basic (in Shares)	39,570	38,684	39,337	38,577
Diluted (in Shares)	40,745	39,608	40,670	39,563
Cash dividends declared per common share (in Dollars per share)	$ 0.20	$ 0.15	$ 0.40	$ 0.15