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Property and Equipment and Assets Held For Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Property and equipment at cost $ 3,453   $ 3,453   $ 3,411
Less: accumulated depreciation (2,606)   (2,606)   (2,314)
Property and equipment, net 847   847   1,097
Depreciation 100 $ 200 300 $ 300  
Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment at cost 1,582   $ 1,582   1,557
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   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   47
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Property and equipment at cost 137   $ 137   137
Computer software          
Property, Plant and Equipment [Line Items]          
Useful life     3 years    
Property and equipment at cost 1,043   $ 1,043   1,043
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment at cost 211   211   201
Projects in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment at cost $ 62   $ 62   $ 55