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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total cost $ 11,031 $ 10,603
Less: Total accumulated depreciation (8,673) (8,263)
Construction in progress 373 0
Total property, plant and equipment, net 2,731 2,340
Tools, Dies and Molds [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 10,038 9,660
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 493 203
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 211 277
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 289 $ 463