Property and Equipment

3 Months Ended

Mar. 31, 2018

Property Plant And Equipment [Abstract]

Property and Equipment

9. Property and Equipment

Property and equipment and related accumulated depreciation and amortization are as follows (in thousands):

	March 31, 2018			December 31, 2017
Lab equipment	$	36,767		$	36,533
Computer equipment		12,256			11,808
Software		11,960			10,694
Furniture and office equipment		5,440			3,959
Leasehold improvements		32,674			26,968
Construction in progress		3,021			7,523
Total cost		102,118			97,485
Less: accumulated depreciation and amortization		(60,511	)		(56,366	)
Total property and equipment, net	$	41,607		$	41,119

Depreciation and amortization expense for the three months ended March 31, 2018 and 2017 was $5,365,000 and $4,466,000, respectively. The Company classifies capitalized internal use software in lab equipment, computer equipment and software based on its intended use.