Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 37,565	$ 28,106	$ 74,525	$ 56,624
Cost of revenues	2,499	1,616	4,918	3,270
Gross profit	35,066	26,490	69,607	53,354
Operating expenses:
Sales and marketing	19,137	14,049	35,291	29,041
General and administrative	8,301	6,505	16,695	13,217
Settlement with State of Delaware			20,000
Total operating expenses	27,438	20,554	71,986	42,258
Income (loss) from operations	7,628	5,936	(2,379)	11,096
Other income and expense:
Interest income and other income	43	45	75	87
Gain (loss) on foreign currency	(1)		29	(209)
Income (loss) before income taxes	7,670	5,981	(2,275)	10,974
Income taxes	2,752	2,734	6,762	5,253
Net income (loss)	$ 4,918	$ 3,247	$ (9,037)	$ 5,721
Basic net income (loss) per share	$ 0.30	$ 0.20	$ (0.55)	$ 0.35
Diluted net income (loss) per share	$ 0.30	$ 0.20	$ (0.55)	$ 0.35
Shares used in computing basic net income (loss) per share	16,462	16,444	16,456	16,444
Shares used in computing diluted net income (loss) per share	16,585	16,453	16,456	16,452