PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015			2014
	(in thousands)
Land	$	4,158		$	4,158
Building		12,718			12,617
Software and computer equipment		6,149			4,415
Lab equipment		12,873			11,772
Office equipment		2,762			2,713
Leasehold improvements		21,723			21,640
Construction in progress		1,555			1,082
Property and equipment, gross		61,938			58,397
Less: accumulated depreciation		(24,594	)		(19,896	)
Property and equipment, net	$	37,344		$	38,501