Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Product revenues	$ 23,877	$ 21,452
Service revenues	7,710	6,275
Total revenues	31,587	27,727
Cost of sales	9,473	8,507
Gross profit	22,114	19,220
Operating expenses:
Selling, general and administrative	17,287	15,008
Research and development	6,775	6,648
Total operating expenses	24,062	21,656
Operating loss	(1,948)	(2,436)
Interest expense	(37)	(59)
Other income (loss), net	16	(39)
Loss before income taxes	(1,969)	(2,534)
Income tax (expense) benefit, net	(2,277)	138
Net loss	$ (4,246)	$ (2,396)
Net loss per share:
Basic (in Dollars per share)	$ (0.26)	$ (0.15)
Diluted (in Dollars per share)	$ (0.26)	$ (0.15)
Weighted average shares used in computing net loss per share:
Basic (in Shares)	16,458	15,969
Diluted (in Shares)	16,458	15,969