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Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2020
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):

March 31,
2020
December 31,
2019
Equipment (useful life 3 to 15 years)
$1,297  $1,297  
Tooling (useful life 2 to 5 years)
203  203  
Vehicles (useful life 5 years)
47  47  
Furniture and fixtures (useful life 5 years)
137  137  
Computer software (useful life 3 years)
1,028  1,028  
Leasehold improvements (the shorter of useful life or lease life)211  211  
Finance lease right-of-use asset13  13  
Projects in progress95  48  
Property and equipment at cost3,031  2,984  
Less: accumulated depreciation(2,641) (2,595) 
Property and equipment, net$390  $389