Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2017

Property Plant And Equipment [Abstract]

Property and Equipment, Net and Depreciation and Amortization Expense Related to Property and Equipment

Property and equipment consist of the following (in thousands):

	Estimated Useful
	Life (Years)		September 30, 2017			December 31, 2016
Land		—	$	875		$	875
Buildings	39-40			17,389			17,389
Building improvements	5-40			34,957			34,957
Machinery and equipment	3-15			62,768			62,992
Furniture, fixtures and office equipment	5-10			3,556			3,556
Computer equipment and software		3		8,531			8,531
Construction in progress		—		—			202
				128,076			128,502
Less accumulated depreciation				(100,702	)		(99,575	)
Total property and equipment, net			$	27,374		$	28,927

Depreciation expense related to property and equipment for the three and nine months ended September 30, 2017 and 2016 was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Depreciation expense	$	454	$	597	$	1,350	$	1,775