Property, Plant, and Equipment, net (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, and Equipment

The estimated useful lives of property and equipment are principally as follows:

Asset	Useful Life
Buildings	39 years
Leasehold Improvements	Shorter of the estimated useful life or lease term
Aircraft	20 years
Machinery & equipment	5 to 7 years
IT software and equipment	3 to 5 years

As of December 31, 2019 and 2018, property, plant, and equipment, net consists of the following :

		As of December 31,
		2019		2018
	(In thousands)
Buildings		$	9,142	$	9,142
Leasehold improvements		20,048		16,570
Aircraft		320		320
Machinery and equipment		33,608		22,114
IT software and equipment		17,151		13,602
Construction in progress		3,674		620
		83,943		62,368
Less accumulated depreciation and amortization		(34,610)		(28,154)
Property, plant, and equipment, net		$	49,333	$	34,214