CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Revenues	$ 50,075	$ 57,216
Cost of revenues	10,345	11,866
Gross profit	39,730	45,350
Operating expenses:
Engineering and product development	795	773
Selling and marketing	31,625	29,326
General and administrative	7,587	5,659
Total operating expenses	40,007	35,758
Income (loss) from operations	(277)	9,592
Other income (loss):
Interest and other financing income (expense), net	(147)	131
Net income (loss) before taxes	(424)	9,723
Income tax expense (benefit)	79	(2,511)
Net income	(345)	7,212
Net income per share:
Basic (in dollars per share)	$ (0.02)	$ 0.35
Diluted (in dollars per share)	$ (0.02)	$ 0.34
Shares used in computing net income per share:
Basic (in shares)	18,719,419	20,678,023
Diluted (in shares)	18,719,419	21,147,583
Other comprehensive income (loss):
Foreign currency translation adjustments	337	(1,813)
Comprehensive income	$ (8)	$ 5,399