4. Property, Plant and Equipment, net (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of property, plant, and equipment

	December 31,
	2019			2018
Leasehold improvements	$	732		$	542
Machinery and equipment		12,430			10,224
Less accumulated depreciation and amortization		(9,198	)		(8,037	)
Property, plant and equipment, net	$	3,964		$	2,729