CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 3,630	$ 3,635	$ 7,013	$ 7,615
Cost of sales	2,273	1,882	3,978	3,579
Gross profit	1,357	1,753	3,035	4,036
Operating expenses:
Research and development	422	891	908	1,849
Selling, general and administrative	2,811	2,967	5,592	5,791
Total operating expenses	3,233	3,858	6,500	7,640
Operating loss	(1,876)	(2,105)	(3,465)	(3,604)
Interest expense, net	(9)	(10)	(14)	(17)
Loss from continuing operations before taxes	(1,885)	(2,115)	(3,479)	(3,621)
Income tax expense	14		14
Loss from continuing operations, net of taxes	(1,899)	(2,115)	(3,493)	(3,621)
Income from discontinued operations	150	659	150	968
Net loss	$ (1,749)	$ (1,456)	$ (3,343)	$ (2,653)
Basic loss per share from continuing operations	$ (0.09)	$ (0.10)	$ (0.17)	$ (0.18)
Basic income per share from discontinued operations	$ 0.01	$ 0.03	$ 0.01	$ 0.05
Basic net loss per share	$ (0.08)	$ (0.07)	$ (0.16)	$ (0.13)
Shares used in computing basic net loss per share	20,664,944	20,506,499	20,642,306	20,497,523
Diluted loss per share from continuing operations	$ (0.09)	$ (0.10)	$ (0.17)	$ (0.18)
Diluted income per share from discontinued operations	$ 0.01	$ 0.03	$ 0.01	$ 0.05
Diluted net loss per share	$ (0.08)	$ (0.07)	$ (0.16)	$ (0.13)
Shares used in computing diluted net loss per share	20,664,944	20,506,499	20,642,306	20,497,523