Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

	December 31,
	2020			2019
Machinery and equipment	$	10,761		$	10,620
Furniture and fixtures		440			440
Office equipment		2,472			2,456
Building improvements		121			103
		13,794			13,619
Less:  Accumulated depreciation and amortization		(13,365	)		(13,227	)
	$	429		$	392