Property and Equipment Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019			2018
Equipment (useful life 3 - 15 years)	$	1,297		$	1,511
Tooling (useful life 2 - 5 years)	203			371
Vehicles (useful life 5 years)	47			47
Furniture and fixtures (useful life 5 years)	137			137
Computer software (useful life 3 years)	1,028			1,043
Leasehold improvements (the shorter of useful life or lease life)	211			211
Finance lease right-of-use asset	13			—
Construction in progress	48			55
Property and equipment at cost	2,984			3,375
Less: accumulated depreciation	(2,595		)	(2,765		)
Property and equipment, net	$	389		$	610