Property and Equipment

6 Months Ended

Jun. 30, 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):

	June 30, 2018			December 31, 2017
Lab equipment	$	37,867		$	36,533
Computer equipment		12,285			11,808
Software		13,013			10,694
Furniture and office equipment		5,442			3,959
Leasehold improvements		37,765			26,968
Construction in progress		10,214			7,523
Total cost		116,586			97,485
Less: accumulated depreciation and amortization		(65,808	)		(56,366	)
Total property and equipment, net	$	50,778		$	41,119

Depreciation and amortization expense for the three and six months ended June 30, 2018 was $5,350,000 and $10,715,000, respectively, and $4,375,000 and $8,841,000 for the three and six months ended June 30, 2017, respectively. The Company classifies capitalized internal use software in lab equipment, computer equipment and software based on its intended use.