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Property and Equipment (Tables)
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the related assets and consist of the following (in thousands):
September 30,
2021		December 31,
2020
Equipment (useful life 3 to 15 years)
$1,308 $1,281 
Tooling (useful life 2 to 5 years)
324 240 
Vehicles (useful life 5 years)
83 47 
Furniture and fixtures (useful life 5 years)
86 137 
Computer software (useful life 3 years)
1,189 1,057 
Leasehold improvements (the shorter of useful life or lease life)169 169 
Finance lease right-of-use asset13 13 
UV - Robots (useful life 5 years)
105 — 
Projects in progress68 140 
Property and equipment at cost3,345 3,084 
Less: accumulated depreciation(2,757)(2,664)
Property and equipment, net$588 $420