Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 141,363	$ 129,150
Cost of revenue	63,357	57,655
Gross profit	78,006	71,495
Operating expenses:
Research and development	25,458	21,609
Selling, general and administrative	30,553	27,318
Litigation expense	278	531
Total operating expenses	56,289	49,458
Income from operations	21,717	22,037
Interest and other income, net	3,341	440
Income before income taxes	25,058	22,477
Income tax expense (benefit)	(1,123)	621
Net income	$ 26,181	$ 21,856
Net income per share:
Basic (in dollars per share)	$ 0.61	$ 0.52
Diluted (in dollars per share)	$ 0.58	$ 0.49
Weighted-average shares outstanding:
Basic (in shares)	42,749	41,922
Diluted (in shares)	45,232	44,282