Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statements of Operations:
Revenue	$ 52,866	$ 39,749	$ 98,940	$ 77,062
Cost of revenue	20,183	14,896	37,233	28,930
Gross profit	32,683	24,853	61,707	48,132
Operating expenses
Marketing and sales	7,261	5,550	13,678	10,813
Research and development	3,914	2,751	7,370	5,379
General and administrative	5,534	3,923	10,237	7,917
Total operating expenses	16,709	12,224	31,285	24,109
Income from operations	15,974	12,629	30,422	24,023
Other income (expense), net	(66)	116	37	119
Income before income taxes	15,908	12,745	30,459	24,142
Provision for income taxes	4,952	4,134	9,401	7,244
Net income	10,956	8,611	21,058	16,898
Net income per share:
Basic (in Dollars per share)	$ 0.43	$ 0.34	$ 0.82	$ 0.68
Diluted (in Dollars per share)	$ 0.42	$ 0.33	$ 0.81	$ 0.66
Shares used to compute net income per share:
Basic (in Shares)	25,620,005	25,258,932	25,597,055	25,030,283
Diluted (in Shares)	26,146,848	25,850,247	26,132,265	25,627,382
Comprehensive Income (net of tax)
Comprehensive income	$ 11,488	$ 8,413	$ 21,762	$ 15,793