Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued payroll and related costs	$ 814	$ 1,299
Warranty reserve	130	118
Restructuring charges	225	273
Other accrued liabilities	381	484
Accrued liabilities	$ 1,550	$ 2,174