Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property and Equipment

Schedule of major classifications of property and equipment and estimated useful lives

	Estimated useful lives				As of December 31,
	in years				2021			2020
Office furniture and equipment		3	to	10	$	5,410		$	5,219
Leasehold improvements		2	to	7		1,610			1,610
Vehicles		5	to	10		206			206
Manufacturing and test equipment		2	to	10		2,846			2,833
						10,072			9,868
Accumulated depreciation and amortization						(9,328	)		(8,962	)
Property and equipment, net					$	744		$	906