Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 159,975	$ 128,939	[1]	$ 428,885	$ 341,499	[1]
Cost of revenue	70,957	58,083		190,810	154,377
Gross profit	89,018	70,856		238,075	187,122
Operating expenses:
Research and development	25,630	21,442		70,720	60,629
Selling, general and administrative	29,552	25,255		85,431	73,219
Litigation expense	343	327		1,513	903
Total operating expenses	55,525	47,024		157,664	134,751
Income from operations	33,493	23,832		80,411	52,371
Interest and other income, net	2,714	1,255		5,387	3,873
Income before income taxes	36,207	25,087		85,798	56,244
Income tax provision	4,639	1,445		8,168	3,112
Net income	$ 31,568	$ 23,642		$ 77,630	$ 53,132
Net income per share:
Basic (in dollars per share)	$ 0.75	$ 0.57		$ 1.84	$ 1.29
Diluted (in dollars per share)	$ 0.71	$ 0.54		$ 1.75	$ 1.22
Weighted-average shares outstanding:
Basic (in shares)	42,362	41,458		42,173	41,276
Diluted (in shares)	44,669	43,486		44,450	43,384
Cash dividends declared per common share (in dollars per share)	$ 0.30	$ 0.20		$ 0.90	$ 0.60

[1] 2017 amounts have not been adjusted under the modified retrospective method.