Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statements of Operations:
Revenue	$ 163,112	$ 125,991	$ 98,939
Cost of revenue	61,410	49,853	39,324
Gross profit	101,702	76,138	59,615
Operating expenses
Marketing and sales	22,386	18,098	15,752
Research and development	11,863	9,137	5,222
General and administrative	16,154	13,957	11,772
Total operating expenses	50,403	41,192	32,746
Income from operations	51,299	34,946	26,869
Other income (expense), net	279	23	(114)
Income before income taxes	51,578	34,969	26,755
Provision for income taxes	16,301	10,944	8,783
Net income	35,277	24,025	17,972
Less: dividends on redeemable preferred stock			(4,179)
Less: undistributed earnings allocated to preferred shareholders			(4,507)
Net income attributable to common shareholders	35,277	24,025	9,286
Net income per share:
Basic (in Dollars per share)	$ 1.40	$ 1.03	$ 0.75
Diluted (in Dollars per share)	$ 1.36	$ 0.98	$ 0.67
Shares used to compute net income per share:
Basic (in Shares)	25,198,556	23,373,593	12,352,004
Diluted (in Shares)	25,859,741	24,443,665	13,939,072
Other Comprehensive Income (Loss), net of tax
Foreign currency translation adjustments	(163)	(190)	(280)
Comprehensive income	$ 35,114	$ 23,835	$ 17,692