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Property and Equipment and Assets Held For Sale - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment at cost $ 3,374   $ 3,375
Less: accumulated depreciation (2,864)   (2,765)
Property and equipment, net 510   610
Depreciation 105 $ 151  
Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment at cost $ 1,491   1,511
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Tooling      
Property, Plant and Equipment [Line Items]      
Property and equipment at cost $ 371   371
Tooling | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 2 years    
Tooling | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Vehicles      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Property and equipment at cost $ 47   47
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Property and equipment at cost $ 137   137
Computer software      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Property and equipment at cost $ 1,043   1,043
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment at cost 211   211
Finance lease right-of-use asset      
Property, Plant and Equipment [Line Items]      
Property and equipment at cost 13   0
Projects in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment at cost $ 61   $ 55