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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
 
 
 
Equipment (useful life 3 - 15 years)
$
2,231

 
$
2,864

Tooling (useful life 2 - 5 years)
863

 
851

Vehicles (useful life 5 years)
39

 
39

Furniture and fixtures (useful life 5 years)
170

 
104

Computer software (useful life 3 years)
977

 
581

Leasehold improvements (the shorter of useful life or lease life)
256

 
509

Construction in progress
154

 
310

Property and equipment at cost
4,690

 
5,258

Less: accumulated depreciation
(2,365
)
 
(2,829
)
Property and equipment, net
$
2,325

 
$
2,429