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Property and Equipment
 12 Months Ended
Dec. 31, 2020
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): 
 At December 31,
 20202019
Equipment (useful life 3 - 15 years)
$1,281 $1,297 
Tooling (useful life 2 - 5 years)
240 203 
Vehicles (useful life 5 years)
47 47 
Furniture and fixtures (useful life 5 years)
137 137 
Computer software (useful life 3 years)
1,057 1,028 
Leasehold improvements (the shorter of useful life or lease life)169 211 
Finance lease right-of-use asset13 13 
Construction in progress140 48 
Property and equipment at cost3,084 2,984 
Less: accumulated depreciation(2,664)(2,595)
Property and equipment, net$420 $389 
 
Depreciation expense was $0.2 million and $0.3 million for the years ended December 31, 2020 and 2019, respectively.
In 2019, the Company ceased operations of the Taiwan affiliate and closed the Taiwan office. The net carrying value of the property and equipment of the office was immaterial. There were no impairment charges for property and equipment during 2020 and 2019.