Other Accrued Liabilities (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Other accrued liabilities
Accrued inventory received	$ 15,000	$ 2,000
Accrued professional services	81,000	150,000
Accrued warranty	140,000	227,000
Other	138,000	107,000
Total	$ 343,000	$ 517,000