Other Accrued Liabilities (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Other accrued liabilities
Accrued inventory received	$ 10,000	$ 10,000
Accrued professional services	$ 319,000	298,000
Accrued warranty		74,000
Other	$ 41,000	49,000
Total	$ 370,000	$ 431,000