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Property, Plant and Equipment, net (Details) - Property, plant and equipment - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 3,117 $ 2,984
Less accumulated depreciation 770 698
Net property, plant and equipment 2,347 2,286
Machinery Fixture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 3,105 2,972
Leaseholds and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 12 $ 12