CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net revenue:
Products	$ 60,057	$ 46,879	$ 40,043
Service	17,220	13,411	13,231
Total net revenue	77,277	60,290	53,274
Cost of Revenue:
Products	26,911	17,545	15,805
Service	8,826	8,433	7,253
Total cost of revenue	35,737	25,978	23,058
Gross profit	41,540	34,312	30,216
Operating expenses:
Sales and marketing	28,664	25,499	24,735
Research and development	8,427	9,141	7,004
General and administrative	11,276	10,104	9,576
Total operating expenses	48,367	44,744	41,315
Loss from operations	(6,827)	(10,432)	(11,099)
Interest and other income, net	497	614	583
Loss before income taxes	(6,330)	(9,818)	(10,516)
Provision for income taxes	218	243	2
Net Loss	$ (6,548)	$ (10,061)	$ (10,518)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.46)	$ (0.73)	$ (0.78)
Weighted-average number of shares used in per share calculations:
Basic and diluted (in shares)	14,089	13,807	13,540