Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statements of Operations:
Revenue	$ 63,969	$ 52,866	$ 122,505	$ 98,940
Cost of revenue	26,419	20,183	49,701	37,233
Gross profit	37,550	32,683	72,804	61,707
Operating expenses
Marketing and sales	9,502	7,261	18,356	13,678
Research and development	4,397	3,914	8,711	7,370
General and administrative	6,304	5,534	12,549	10,237
Total operating expenses	20,203	16,709	39,616	31,285
Income from operations	17,347	15,974	33,188	30,422
Other income (expense), net	(36)	(66)	(493)	37
Income before income taxes	17,311	15,908	32,695	30,459
Provision for income taxes	5,625	4,952	10,556	9,401
Net income	$ 11,686	$ 10,956	$ 22,139	$ 21,058
Net income per share:
Basic (in dollars per share)	$ 0.45	$ 0.43	$ 0.86	$ 0.82
Diluted (in dollars per share)	$ 0.44	$ 0.42	$ 0.84	$ 0.81
Shares used to compute net income per share:
Basic (in shares)	25,921,111	25,620,005	25,885,888	25,597,055
Diluted (in shares)	26,277,503	26,146,848	26,245,135	26,132,265
Comprehensive Income (net of tax)
Comprehensive income	$ 12,960	$ 11,488	$ 22,338	$ 21,762