CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Revenues	$ 56,681	$ 34,745	$ 165,860	$ 103,333
Cost of revenues	11,281	8,142	34,870	20,054
Gross profit	45,400	26,603	130,990	83,279
Operating expenses:
Engineering and product development	628	281	2,146	700
Selling and marketing	28,285	15,468	85,188	45,505
General and administrative	6,231	4,540	22,593	36,279
Total operating expenses	35,144	20,289	109,927	82,484
Operating profit (loss)	10,256	6,314	21,063	795
Other income (loss):
Interest and other financing income (expense), net	(231)	(91)	(862)	101
Income before income tax expense (benefit)	10,025	6,223	20,201	896
Income tax expense (benefit)	2,500	1,974	3,606	(1,393)
Net income (loss)	7,525	4,249	16,595	2,289
Net income (loss) per share:
Basic (in dollars per share)	$ 0.35	$ 0.34	$ 0.83	$ 0.21
Diluted (in dollars per share)	$ 0.35	$ 0.32	$ 0.81	$ 0.20
Shares used in computing net income (loss) per share:
Basic (in shares)	21,205,675	12,342,160	20,001,456	10,951,630
Diluted (in shares)	21,752,845	13,183,255	20,548,626	11,670,555
Other comprehensive loss:
Foreign currency translation adjustments	961	0	865	0
Comprehensive income (loss)	$ 8,486	$ 4,249	$ 17,460	$ 2,289