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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Finance lease right-of-use asset $ 13   $ 13
Property and equipment at cost 3,266   3,477
Less: accumulated depreciation (2,635)   (2,802)
Property and equipment, net 631   675
Depreciation 44 $ 47  
Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,148   1,308
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 3 years    
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 15 years    
Tooling      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 414   384
Tooling | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 2 years    
Tooling | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 5 years    
Vehicles      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 83   83
Useful life (in years) 5 years    
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 86   86
Useful life (in years) 5 years    
Computer software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,144   1,194
Useful life (in years) 3 years    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 169   169
UV - Robots      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 105   105
Useful life (in years) 5 years    
Projects in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 104   $ 135