Other Accrued Liabilities (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Other accrued liabilities
Accrued inventory received	$ 14,000	$ 14,000
Accrued professional services	95,000	45,000
Accrued warranty	93,000	117,000
Other	73,000	79,000
Total	$ 275,000	$ 255,000