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Other Current Liabilities - Components of Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Current Liabilities    
Accrued expenses $ 466 $ 518
Taxes 90 38
Warranty provision 31 27
Restructuring liabilities 64 46
Other current liabilities $ 651 $ 629