CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Revenues	$ 220,651	$ 132,082	$ 70,071
Cost of revenues	46,642	26,296	16,465
Gross profit	174,009	105,786	53,606
Operating expenses:
Engineering and product development	2,914	1,057	839
Selling and marketing	116,487	62,185	28,950
General and administrative	27,330	45,192	5,646
Total operating expenses	146,731	108,434	35,435
Operating profit (loss)	27,278	(2,648)	18,171
Other income (loss):
Interest and other financing income (expense), net	(351)	(68)	(283)
Income (loss) before income tax (expense) benefit	26,927	(2,716)	17,888
Income tax (expense) benefit	(4,438)	2,022	(6,287)
Net income (loss)	22,489	(694)	11,601
Net income(loss) per share (Note 1):
Basic (in dollars per share)	$ 1.10	$ (0.06)	$ 1.13
Diluted (in dollars per share)	$ 1.08	$ (0.06)	$ 0.99
Shares used in computing net income (loss) per share:
Basic (in shares)	20,355,520	11,602,049	10,256,364
Diluted (in shares)	20,764,354	11,602,049	11,724,569
Other comprehensive income:
Foreign currency translation adjustments	859	2	0
Comprehensive income	$ 23,348	$ (692)	$ 11,601