Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Depreciation and amortization of property, plant and equipment is provided for under the straight-line method over the assets’ estimated useful lives as follows:

	Useful Lives
Buildings and improvements	10 - 40 years
Machinery and equipment	5 - 15 years
Computer hardware and software	3 - 5 years
Furniture and fixtures	5 years

Property, plant and equipment, at cost, as of December 31, 2017 and 2016, consisted of:

	2017			2016
	(in thousands)
Land	$	257		$	257
Building and improvements	8,613			8,515
Machinery and equipment	9,142			7,515
Computer hardware and software	3,244			724
Furniture and fixtures	449			344
Construction in progress	55,017			15,496
	76,722			32,851
Less accumulated depreciation and amortization	(8,367		)	(6,636		)
Property, plant and equipment, net	$	68,355		$	26,215