SUPPLEMENTARY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
SUPPLEMENTARY FINANCIAL DATA (UNAUDITED) [Abstract]
Net revenue	$ 22,239	$ 16,828	$ 19,560	$ 15,967	$ 22,533	$ 19,426	$ 19,591	$ 15,727	$ 74,594	$ 77,277	$ 60,290
Cost of revenue	9,202	7,651	8,442	7,417	9,790	8,828	9,274	7,845	32,712	35,737	25,978
Gross profit	13,037	9,177	11,118	8,550	12,743	10,598	10,317	7,882	41,882	41,540	34,312
Operating expenses:
Sales and marketing	7,804	6,554	7,170	6,456	7,101	7,014	7,112	7,437	27,984	28,664	25,499
Research and development	2,438	2,440	2,217	2,121	2,122	2,217	1,872	2,216	9,216	8,427	9,141
General and administrative	3,135	2,160	2,354	2,289	2,452	2,475	2,854	3,495	9,938	11,276	10,104
Total operating expenses	13,377	11,154	11,741	10,866	11,675	11,706	11,838	13,148	47,138	48,367	44,744
Income (loss) from operations	(340)	(1,977)	(623)	(2,316)	1,068	(1,108)	(1,521)	(5,266)	(5,256)	(6,827)	(10,432)
Interest and other income, net	105	140	75	135	105	152	144	96	455	497	614
Loss before income taxes	(235)	(1,837)	(548)	(2,181)	1,173	(956)	(1,377)	(5,170)	(4,801)	(6,330)	(9,818)
Income tax provision (benefit)	43	(169)	90	(18)	96	(64)	89	97	(54)	218	243
Net Loss	$ (278)	$ (1,668)	$ (638)	$ (2,163)	$ 1,077	$ (892)	$ (1,466)	$ (5,267)	$ (4,747)	$ (6,548)	$ (10,061)
Net income (loss) per share-basic (in dollars per share)	$ (0.02)	$ (0.11)	$ (0.04)	$ (0.15)	$ 0.08	$ (0.06)	$ (0.10)	$ (0.38)
Net income (loss) per share-diluted (in dollars per share)	$ (0.02)	$ (0.11)	$ (0.04)	$ (0.15)	$ 0.08	$ (0.06)	$ (0.10)	$ (0.38)
Weighted average number of shares used in per share calculations:
Basic (in shares)	14,016	14,541	14,723	14,408	14,173	14,127	14,095	13,960
Diluted (in shares)	14,016	14,541	14,723	14,408	14,272	14,127	14,095	13,960