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
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Revenues	$ 224,664	$ 220,651	$ 132,082
Cost of revenues	45,035	46,642	26,296
Gross profit	179,629	174,009	105,786
Operating expenses:
Engineering and product development	3,306	2,914	1,057
Selling and marketing	127,528	116,487	62,185
General and administrative	26,750	27,330	45,192
Total operating expenses	157,584	146,731	108,434
Operating profit (loss)	22,045	27,278	(2,648)
Other income (loss):
Interest and other financing income (expense), net	702	(351)	(68)
Income (loss) before income tax (expense) benefit	22,747	26,927	(2,716)
Income tax (expense) benefit	(4,370)	(4,438)	2,022
Net income (loss)	18,377	22,489	(694)
Net income(loss) per share (Note 1):
Basic (in dollars per share)	$ 0.90	$ 1.10	$ (0.06)
Diluted (in dollars per share)	$ 0.89	$ 1.08	$ (0.06)
Shares used in computing net income (loss) per share:
Basic (in shares)	20,454,970	20,355,520	11,602,049
Diluted (in shares)	20,657,240	20,764,354	11,602,049
Other comprehensive income:
Foreign currency translation adjustments	678	859	2
Comprehensive income	$ 19,055	$ 23,348	$ (692)