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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
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):
  
 
At December 31,
 
2018
 
2017
 
 
 
 
Equipment (useful life 3 - 15 years)
$
1,511

 
$
1,557

Tooling (useful life 2 - 5 years)
371

 
371

Vehicles (useful life 5 years)
47

 
47

Furniture and fixtures (useful life 5 years)
137

 
137

Computer software (useful life 3 years)
1,043

 
1,043

Leasehold improvements (the shorter of useful life or lease life)
211

 
201

Construction in progress
55

 
55

Property and equipment at cost
3,375

 
3,411

Less: accumulated depreciation
(2,765
)
 
(2,314
)
Property and equipment, net
$
610

 
$
1,097