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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   $ 3,375 $ 3,411  
Less: accumulated depreciation   (2,765) (2,314)  
Property and equipment, net   610 1,097  
Depreciation   522 681 $ 805
Impairment loss on equipment and software     200 900
Gain on sale   $ (2) (203) $ (38)
Minimum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life   2 years    
Maximum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life   15 years    
Equipment        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   $ 1,511 $ 1,557  
Net proceeds $ 200      
Gain on sale $ 15      
Equipment | Minimum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life     3 years 3 years
Equipment | Maximum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life     15 years 15 years
Tooling        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   371 $ 371  
Tooling | Minimum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life     2 years 2 years
Tooling | Maximum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life     5 years 5 years
Vehicles        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   47 $ 47  
Property and equipment, useful life     5 years 5 years
Furniture and fixtures        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   137 $ 137  
Property and equipment, useful life     5 years 5 years
Computer software        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   1,043 $ 1,043  
Property and equipment, useful life     3 years 3 years
Leasehold improvements        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   211 $ 201  
Construction in progress        
Property, Plant and Equipment [Line Items]        
Property and equipment at cost   $ 55 $ 55