PROPERTY, PLANT, AND EQUIPMENT

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

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


(In thousands)	Estimated Useful Life	September 30, 2020		December 31, 2019
Property, plant and equipment
Land	n/a	$	4,466	$	4,466
Leasehold and building improvements	(1)	113,153		80,352
Land improvements	15 years	3,222		1,766
Buildings	30 - 40 years	200,141		112,815
Computer equipment and computer software	3 years	78,350		65,323
Laboratory equipment	3 - 10 years	136,462		104,008
Furniture and fixtures	3 - 10 years	23,950		14,539
Assets under construction	n/a	26,472		149,687
Property, plant and equipment, at cost		586,216		532,956
Accumulated depreciation		(129,761)		(77,631)
Property, plant and equipment, net		$	456,455	$	455,325

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(1)Lesser of remaining lease term, building life, or estimated useful life.

Depreciation expense for the three months ended September 30, 2020 and 2019 was $19.5 million and $8.4 million, respectively. Depreciation expense for the nine months ended September 30, 2020 and 2019 was $52.9 million and $21.8 million, respectively.

At September 30, 2020, the Company had $26.5 million of assets under construction which consisted of $9.7 million in laboratory equipment, $8.4 million of building and leasehold improvements, $7.9 million in capitalized costs related to software projects, and $0.5 million related to furniture and fixtures. Depreciation will begin on these assets once they are placed into service. The Company expects to incur an additional $2.0 million to complete the laboratory equipment, $13.3 million to complete the building projects and leasehold improvements, $3.6 million to complete the software projects, and minimal costs to complete the furniture and fixtures. These projects are expected to be completed throughout 2020 and 2021.