PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016			2015
	(in thousands)
Land	$	4,158		$	4,158
Building and improvements		12,729			12,718
Software and computer equipment		6,775			6,149
Lab equipment		14,149			12,873
Office equipment		3,028			2,762
Leasehold improvements		22,872			21,723
Construction in progress		4,436			1,555
Property and equipment, gross		68,147			61,938
Less: accumulated depreciation		(30,346	)		(24,594	)
Property and equipment, net	$	37,801		$	37,344