Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue	$ 128,939	$ 106,456	$ 341,499	$ 285,047
Cost of revenue	58,083	48,531	154,377	130,686
Gross profit	70,856	57,925	187,122	154,361
Operating expenses:
Research and development	21,442	20,472	60,629	55,669
Selling, general and administrative	25,255	22,397	73,219	61,696
Litigation expense, net	327	55	903	92
Total operating expenses	47,024	42,924	134,751	117,457
Income from operations	23,832	15,001	52,371	36,904
Interest and other income, net	1,255	780	3,873	1,920
Income before income taxes	25,087	15,781	56,244	38,824
Income tax provision	1,445	1,408	3,112	2,678
Net income	$ 23,642	$ 14,373	$ 53,132	$ 36,146
Net income per share:
Basic (in dollars per share)	$ 0.57	$ 0.35	$ 1.29	$ 0.90
Diluted (in dollars per share)	$ 0.54	$ 0.34	$ 1.22	$ 0.87
Weighted-average shares outstanding:
Basic (in shares)	41,458	40,590	41,276	40,335
Diluted (in shares)	43,486	41,895	43,384	41,752
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.20	$ 0.60	$ 0.60