Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue:
Products	$ 4,209	$ 4,834
Service and supplies	4,311	3,096
Total revenue	8,520	7,930
Cost of revenue:
Products	1,199	1,162
Service and supplies	1,146	887
Amortization of acquired intangibles	241	233
Total cost of revenue	2,586	2,282
Gross profit	5,934	5,648
Operating expenses:
Engineering and product development	2,027	1,866
Marketing and sales	2,619	2,438
General and administrative	1,748	1,672
Total operating expenses	6,394	5,976
Loss from operations	(460)	(328)
Gain from change in fair value of warrant	1,136	431
Interest expense	(817)	(826)
Other income	4	6
Other income (expense), net	323	(389)
Loss before income tax expense	(137)	(717)
Tax expense	(53)	(10)
Net loss and comprehensive loss	$ (190)	$ (727)
Net loss per share:
Basic and diluted	$ (0.02)	$ (0.07)
Weighted average number of shares used in computing loss per share:
Basic and diluted	11,429	10,820