Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 112,198	$ 94,079	$ 212,560	$ 178,591
Cost of revenue	50,773	43,153	96,293	82,155
Gross profit	61,425	50,926	116,267	96,436
Operating expenses:
Research and development	20,292	17,876	39,186	35,197
Selling, general and administrative	25,873	21,531	47,965	39,299
Litigation expense (benefit)	290	(8)	576	37
Total operating expenses	46,455	39,399	87,727	74,533
Income from operations	14,970	11,527	28,540	21,903
Interest and other income, net	1,237	597	2,618	1,140
Income before income taxes	16,207	12,124	31,158	23,043
Income tax provision	1,193	926	1,668	1,270
Net income	$ 15,014	$ 11,198	$ 29,490	$ 21,773
Net income per share:
Basic (in dollars per share)	$ 0.36	$ 0.28	$ 0.72	$ 0.54
Diluted (in dollars per share)	$ 0.35	$ 0.27	$ 0.68	$ 0.52
Weighted-average shares outstanding:
Basic (in shares)	41,323	40,387	41,185	40,208
Diluted (in shares)	43,397	41,716	43,332	41,681
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.20	$ 0.40	$ 0.40