Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue	$ 582,382	$ 470,929	$ 388,665
Cost of revenue	259,714	212,646	177,792
Gross profit	322,668	258,283	210,873
Operating expenses:
Research and development	93,455	82,359	73,643
Selling, general and administrative	113,803	97,257	83,012
Litigation expense (benefit), net	1,922	1,243	(229)
Total operating expenses	209,180	180,859	156,426
Income from operations	113,488	77,424	54,447
Interest and other income, net	4,994	5,520	2,817
Income before income taxes	118,482	82,944	57,264
Income tax provision	13,214	17,741	4,544
Net income	$ 105,268	$ 65,203	$ 52,720
Net income per share:
Basic (in dollars per share)	$ 2.49	$ 1.58	$ 1.30
Diluted (in dollars per share)	$ 2.36	$ 1.50	$ 1.26
Weighted-average shares outstanding:
Basic (in shares)	42,247	41,350	40,436
Diluted (in shares)	44,602	43,578	41,915