Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Summary of property, plant and equipment

	December 31,
	2017			2016
Land	$	1,000		$	1,000
Building		3,361			3,361
Machinery and equipment		10,530			10,461
Furniture and fixtures		437			432
Office equipment		2,439			2,377
Building improvements		1,433			1,421
		19,200			19,052
Less: Accumulated depreciation and amortization		(16,094	)		(15,773	)
	$	3,106		$	3,279