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Other Current Liabilities - Components of Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accrued expenses $ 518 $ 2,081
Taxes 38 12
Warranty provision 27 122
Restructuring liabilities 46 45
Other current liabilities $ 629 $ 2,260