Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 168,813	$ 159,975	$ 461,183	$ 428,885
Cost of revenue	75,655	70,957	206,794	190,810
Gross profit	93,158	89,018	254,389	238,075
Operating expenses:
Research and development	27,742	25,630	80,746	70,720
Selling, general and administrative	34,692	29,552	100,302	85,431
Litigation expense	692	343	1,473	1,513
Total operating expenses	63,126	55,525	182,521	157,664
Income from operations	30,032	33,493	71,868	80,411
Interest and other income, net	2,257	2,714	7,827	5,387
Income before income taxes	32,289	36,207	79,695	85,798
Income tax expense	2,761	4,639	3,293	8,168
Net income	$ 29,528	$ 31,568	$ 76,402	$ 77,630
Net income per share
Basic (in dollars per share)	$ 0.68	$ 0.75	$ 1.77	$ 1.84
Diluted (in dollars per share)	$ 0.64	$ 0.71	$ 1.68	$ 1.75
Weighted-average shares outstanding:
Basic (in shares)	43,308	42,362	43,055	42,173
Diluted (in shares)	45,833	44,669	45,516	44,450