PROPERTY AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019			2018
	(in thousands)
Leasehold improvements	$	53,950		$	20,937
Software and computer equipment		30,683			15,774
Lab equipment		30,053			17,659
Building and improvements		23,108			22,972
Furniture and fixtures		7,090			3,227
Land		5,183			4,158
Land improvements		3,403			—
Office equipment		1,157			436
Construction in progress		25,988			40,010
Property and equipment, gross		180,615			125,173
Less: accumulated depreciation		(50,995	)		(28,149	)
Property and equipment, net	$	129,620		$	97,024