Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 627,921	$ 582,382	$ 470,929
Cost of revenue	281,596	259,714	212,646
Gross profit	346,325	322,668	258,283
Operating expenses:
Research and development	107,757	93,455	82,359
Selling, general and administrative	133,542	113,803	97,257
Litigation expense	2,464	1,922	1,243
Total operating expenses	243,763	209,180	180,859
Income from operations	102,562	113,488	77,424
Interest and other income, net	10,558	4,994	5,520
Income before income taxes	113,120	118,482	82,944
Income tax expense	4,281	13,214	17,741
Net income	$ 108,839	$ 105,268	$ 65,203
Net income per share
Basic (in dollars per share)	$ 2.52	$ 2.49	$ 1.58
Diluted (in dollars per share)	$ 2.38	$ 2.36	$ 1.50
Weighted-average shares outstanding:
Basic (in shares)	43,165	42,247	41,350
Diluted (in shares)	45,763	44,602	43,578