Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Estimated useful lives by each type of asset category are as follows:

	Years
Buildings	Up to 39
Leasehold improvements	Lesser of (i) expected useful life of improvement or (ii) life of lease (including likely extension thereof)
Machinery and equipment	1 to 10

Property, plant and equipment by type were as follows:

(in thousands)	As of December 31,
Property, Plant and Equipment	2020		2019
Leasehold improvements	$	6,725	$	6,745
Machinery and equipment	43,030		41,243
Construction in progress	1,670		1,679
Total property, plant and equipment, at cost	51,425		49,667
Accumulated depreciation	(31,244)		(26,473)
Property, plant and equipment, net	$	20,181	$	23,194