4. Property, Plant and Equipment, net

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

	December 31,
	2020			2019
Leasehold improvements	$	727		$	732
Machinery and equipment		11,971			12,430
Gross Property, Plant, and Equipment		12,698			13,162
Less accumulated depreciation and amortization		(9,132	)		(9,198	)
Property, plant and equipment, net	$	3,566		$	3,964

Depreciation and amortization expense relating to property, plant and equipment for the years ended December 31, 2020 and 2019 was approximately $1,344 and $1,219, respectively. During the year ended 31, 2020, the company removed from its records approximately $1,400 of fully depreciated machinery and equipment.