4. Property, Plant and Equipment, net

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

	December 31,
	2015			2014
Leasehold improvements	$	369		$	370
Machinery and equipment		7,184			6,214
Less accumulated depreciation and amortization		(5,713	)		(5,302	)
Property, plant and equipment, net	$	1,840		$	1,282

Depreciation and amortization expense relating to property, plant, and equipment for the years ended December 31, 2015 and 2014 was $531 and $460, respectively.