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Property and Equipment
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment 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):
March 31,
2022		December 31,
2021
Equipment (useful life 3 to 15 years)
$1,148 $1,308 
Tooling (useful life 2 to 5 years)
414 384 
Vehicles (useful life 5 years)
83 83 
Furniture and fixtures (useful life 5 years)
86 86 
Computer software (useful life 3 years)
1,144 1,194 
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)
105 105 
Projects in progress104 135 
Property and equipment at cost3,266 3,477 
Less: accumulated depreciation(2,635)(2,802)
Property and equipment, net$631 $675 
Depreciation expense was $44 thousand and $47 thousand for the three months ended March 31, 2022 and 2021, respectively.