Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue	$ 37,313	$ 29,970
Cost of revenue	14,034	12,243
Gross profit	23,279	17,727
Operating expenses
Marketing and sales	5,263	4,441
Research and development	2,628	1,660
General and administrative	3,994	3,988
Total operating expenses	11,885	10,089
Income from operations	11,394	7,638
Other income (expense), net	3	(577)
Income before income taxes	11,397	7,061
Provision for income taxes	3,110	2,279
Net income	8,287	4,782
Net income per share:
Basic	$ 0.33	$ 0.23
Diluted	$ 0.32	$ 0.22
Shares used to compute net income per share:
Basic	25,014,907	20,934,948
Diluted	25,645,744	22,226,356
Comprehensive income	$ 7,380	$ 5,240