Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

	Useful		September 30,			December 31,
	Life		2021			2020
Research and development equipment		5 years	$	1,425		$	1,397
Office and computer equipment (1)		3 years		762			733
Autos		5 years		54			54
Furniture and fixtures		7 years		41			41
Leasehold improvements		*		113			283
Construction in progress				32			115
				2,427			2,623
Less accumulated depreciation and amortization				(2,030	)		(2,085	)
Total			$	397		$	538

*

Shorter of lease term or estimated useful life

(1)

In the three months ended and nine months ended September 30, 2021, the Company received net proceeds of less than $1 in the sale of research and development equipment resulting in gains on the sale of these assets of less than $1. In the three months ended and nine months ended September 30, 2020, the Company received net proceeds of $0 and $44 in the sale of research and development equipment and office and computer equipment, respectively, resulting in a gain on the sale of these assets of $0 and $18 for the three months ended and nine months ended September 30, 2020, respectively.