PROPERTY AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

Summarizes Components of Property and Equipment, Net

Property and equipment are recorded at historical cost, net of accumulated depreciation. The following table summarizes components of property and equipment, net, for each of the periods indicated:

	As of December 31,
	2020			2019
	(in thousands)
Leasehold improvements	$	55,019		$	53,950
Lab equipment		49,571			30,053
Building and improvements		39,397			23,108
Software and computer equipment		33,948			30,683
Furniture and fixtures		7,010			7,090
Land		5,183			5,183
Land improvements		3,610			3,403
Office equipment		1,178			1,157
Construction in progress		71,541			25,988
Property and equipment, gross		266,457			180,615
Less: accumulated depreciation		(76,027	)		(50,995	)
Property and equipment, net	$	190,430		$	129,620