CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net revenue:
Products	$ 46,879	$ 40,043	$ 40,496
Service	13,411	13,231	13,186
Total net revenue	60,290	53,274	53,682
Cost of revenue:
Products	17,545	15,805	14,083
Service	8,433	7,253	7,676
Total cost of revenue	25,978	23,058	21,759
Gross profit	34,312	30,216	31,923
Operating expenses:
Sales and marketing	25,499	24,735	24,286
Research and development	9,141	7,004	6,810
General and administrative	10,104	9,576	10,320
Litigation settlement	0	0	850
Total operating expenses	44,744	41,315	42,266
Loss from operations	(10,432)	(11,099)	(10,343)
Interest and other income, net	614	583	1,572
Loss before income taxes	(9,818)	(10,516)	(8,771)
Provision for income taxes	243	2	8,908
Net loss	$ (10,061)	$ (10,518)	$ (17,679)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.73)	$ (0.78)	$ (1.33)
Weighted-average number of shares used in per share calculations:
Basic and diluted (in shares)	13,807	13,540	13,279