Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Accrued Liabilities [Abstract]
Accrued warranty, current	$ 120	$ 109
Accrued compensation, including commissions and vacation	744	785
Accrued sales and other taxes	872	904
Distributor rights liability, current	88	85
Accrued professional fees and other accrued liabilities	392	477
Total other accrued liabilities	$ 2,216	$ 2,360