Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property and Equipment

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

	Estimated useful lives				As of December 31,
	in years				2019			2018
Office furniture and equipment		3	to	10	$	4,979		$	5,041
Leasehold improvements		2	to	10		1,609			1,570
Vehicles		5	to	10		206			206
Manufacturing and test equipment		2	to	10		2,779			2,633
						9,573			9,450
Accumulated depreciation and amortization						(8,529	)		(8,062	)
Property and equipment, net					$	1,044		$	1,388