Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statements of Operations:
Revenue	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Cost of revenue	50,439	35,671	100,276	70,565
Gross profit	59,213	46,369	117,121	91,642
Operating expenses
Marketing and sales	17,557	14,630	34,129	27,617
Research and development	7,032	6,084	13,697	11,907
General and administrative	12,640	9,253	25,583	18,034
Total operating expenses	37,229	29,967	73,409	57,558
Income from operations	21,984	16,402	43,712	34,084
Other income, net	808	1,173	986	1,488
Income before income taxes	22,792	17,575	44,698	35,572
Provision for income taxes	4,478	5,489	8,333	11,286
Net income	$ 18,314	$ 12,086	$ 36,365	$ 24,286
Net income per share:
Basic (in dollars per share)	$ 0.68	$ 0.46	$ 1.35	$ 0.91
Diluted (in dollars per share)	$ 0.67	$ 0.45	$ 1.34	$ 0.91
Shares used to compute net income per share:
Basic (in shares)	26,972,990	26,541,978	26,925,673	26,554,262
Diluted (in shares)	27,274,882	26,649,152	27,232,215	26,710,217
Comprehensive Income (net of tax)
Comprehensive income	$ 14,796	$ 14,250	$ 35,240	$ 27,635