Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 41,327	$ 39,360	$ 83,504	$ 78,693
Cost of revenues	4,425	3,630	8,411	7,683
Gross profit	36,902	35,730	75,093	71,010
Operating expenses:
Sales and marketing	19,457	16,061	39,115	32,326
General and administrative	9,651	9,303	20,149	18,747
Unexchanged promotional merger shares	0	0	0	3,000
Total operating expenses	29,108	25,364	59,264	54,073
Income from operations	7,794	10,366	15,829	16,937
Other income	112	(16)	144	83
Income before income taxes	7,906	10,350	15,973	17,020
Income taxes	2,706	3,090	5,178	6,012
Net income	$ 5,200	$ 7,260	$ 10,795	$ 11,008
Basic net income per share (in dollars per share)	$ 0.34	$ 0.45	$ 0.70	$ 0.69
Diluted net income per share (in dollars per share)	$ 0.34	$ 0.45	$ 0.70	$ 0.69
Shares used in computing basic net income per share (in shares)	15,362	15,962	15,362	15,962
Shares used in computing diluted net income per share (in shares)	15,457	16,006	15,427	16,012