Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued payroll and related costs	$ 1,292	$ 2,119
Warranty reserve	115	120
Accrued taxes	0	318
Other accrued liabilities	414	328
Accrued liabilities	$ 1,821	$ 2,885