Other Accrued Liabilities (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Other accrued liabilities
Accrued inventory received	$ 15,000	$ 2,000
Accrued professional services	194,000	150,000
Accrued warranty	105,000	227,000
Other	91,000	138,000
Total	$ 405,000	$ 517,000