Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Accrued Liabilities [Abstract]
Accrued warranty, current	$ 91	$ 102
Accrued compensation, including commissions and vacation	1,201	1,177
Accrued sales and other taxes	458	439
License liability - current	283	0
Accrued professional fees and other accrued liabilities	181	274
Total other accrued liabilities	$ 2,214	$ 1,992