Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 151,007	$ 139,761	$ 292,370	$ 268,911
Cost of revenue	67,782	62,197	131,139	119,852
Gross profit	83,225	77,564	161,231	149,059
Operating expenses:
Research and development	27,545	23,481	53,003	45,091
Selling, general and administrative	35,058	28,561	65,611	55,879
Litigation expense	503	640	781	1,171
Total operating expenses	63,106	52,682	119,395	102,141
Income from operations	20,119	24,882	41,836	46,918
Interest and other income, net	2,229	2,232	5,569	2,673
Income before income taxes	22,348	27,114	47,405	49,591
Income tax expense	1,655	2,908	531	3,529
Net income	$ 20,693	$ 24,206	$ 46,874	$ 46,062
Net income per share:
Basic (in dollars per share)	$ 0.48	$ 0.57	$ 1.09	$ 1.09
Diluted (in dollars per share)	$ 0.45	$ 0.55	$ 1.03	$ 1.04
Weighted-average shares outstanding:
Basic (in shares)	43,109	42,237	42,929	42,079
Diluted (in shares)	45,483	44,400	45,358	44,341