4. Property, Plant and Equipment, net

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

	December 31,
	2016			2015
Leasehold improvements	$	392		$	369
Machinery and equipment		8,548			7,184
Less accumulated depreciation and amortization		(6,454	)		(5,713	)
Property, plant and equipment, net	$	2,486		$	1,840

Depreciation and amortization expense relating to property, plant and equipment for the years ended December 31, 2016 and 2015 was approximately $748 and $531, respectively.