Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue	$ 94,079	$ 81,416	$ 178,591	$ 154,954
Cost of revenue	43,153	37,287	82,155	71,142
Gross profit	50,926	44,129	96,436	83,812
Operating expenses:
Research and development	17,876	15,743	35,197	31,781
Selling, general and administrative	21,531	17,964	39,299	35,482
Litigation expense (benefit), net	(8)	311	37	581
Total operating expenses	39,399	34,018	74,533	67,844
Income from operations	11,527	10,111	21,903	15,968
Interest and other income, net	597	235	1,140	877
Income before income taxes	12,124	10,346	23,043	16,845
Income tax provision	926	2,447	1,270	2,983
Net income	$ 11,198	$ 7,899	$ 21,773	$ 13,862
Net income per share:
Basic (in dollars per share)	$ 0.28	$ 0.20	$ 0.54	$ 0.35
Diluted (in dollars per share)	$ 0.27	$ 0.19	$ 0.52	$ 0.34
Weighted-average shares outstanding:
Basic (in shares)	40,387	39,570	40,208	39,337
Diluted (in shares)	41,716	40,745	41,681	40,670
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.20	$ 0.40	$ 0.40