Property and Equipment

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property and Equipment

4. Property and Equipment

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

	Estimated Useful		December 31,
	Life (Years)		2019			2018
Land		—	$	875		$	875
Buildings	39-40			17,389			17,389
Building improvements	5-40			37,543			34,967
Machinery and equipment	3-15			54,982			61,217
Furniture, fixtures and office equipment	5-10			3,005			2,954
Computer equipment and software		3		8,234			8,355
Construction in progress		—		114			342
				122,142			126,099
Less accumulated depreciation				(95,364	)		(100,497	)
Total property and equipment, net			$	26,778		$	25,602

Depreciation expense related to property and equipment for the years ended December 31, 2019 and 2018 was $1.6 million and $1.7 million, respectively. During the year ended December 31, 2019, the Company retired $6.7 million of manufacturing equipment and computer hardware as it was no longer in service. During the year ended December 31, 2018, the Company disposed of $2.1 million of furniture and fixtures, manufacturing equipment and laboratory equipment as it was no longer in service. The net book value for the disposed assets was de minimis.