Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statements of Operations:
Revenues	$ 78,173	$ 67,842	$ 225,702	$ 190,347
Cost of revenue	33,448	27,517	99,077	77,218
Gross profit	44,725	40,325	126,625	113,129
Operating expenses
Marketing and sales	11,787	10,027	34,182	28,383
Research and development	5,976	4,760	17,110	13,471
General and administrative	10,020	8,134	28,397	20,683
Total operating expenses	27,783	22,921	79,689	62,537
Income from operations	16,942	17,404	46,936	50,592
Other income (expense), net	625	593	2,342	100
Income before income taxes	17,567	17,997	49,278	50,692
Provision for income taxes	5,585	5,615	15,943	16,171
Net income	$ 11,982	$ 12,382	$ 33,335	$ 34,521
Net income per share:
Basic (in dollars per share)	$ 0.45	$ 0.47	$ 1.27	$ 1.33
Diluted (in dollars per share)	$ 0.45	$ 0.47	$ 1.26	$ 1.31
Shares used to compute net income per share:
Basic - weighted-average shares outstanding: (in shares)	26,416,041	26,083,405	26,334,738	25,952,451
Diluted (in shares)	26,609,878	26,381,313	26,539,078	26,290,758
Comprehensive Income (net of tax)
Comprehensive income	$ 11,828	$ 11,416	$ 31,781	$ 33,754