Other Accrued Liabilities (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Other accrued liabilities
Accrued inventory received	$ 10,000	$ 14,000
Accrued professional services	89,000	45,000
Accrued warranty	96,000	117,000
Other	25,000	79,000
Total	$ 220,000	$ 255,000