Property and Equipment

12 Months Ended

Dec. 31, 2018

Property Plant And Equipment [Abstract]

PROPERTY AND EQUIPMENT

5. PROPERTY AND EQUIPMENT

Property and equipment, net consists of the following:

	December 31,
	2018			2017
	(in thousands)
Laboratory equipment	$	9,309		$	3,714
Computers and purchased software		248			253
Furniture and fixtures		1,066			51
Leasehold improvements		24,520			34
Assets not yet in service		2,602			—
Property and equipment, at cost		37,745			4,052
Less accumulated depreciation and amortization		(2,108	)		(898	)
Property and equipment—net	$	35,637		$	3,154

Depreciation expense for the years ended December 31, 2018 and 2017 was approximately $1.3 million and $0.7 million, respectively. The Company disposed of approximately $0.1 million of property and equipment, net during the year ended December 31, 2018, primarily related to laboratory equipment no longer in use. There were no disposals during the year ended December 31, 2017. Leasehold improvements as of December 31, 2018 consist primarily of costs associated with the buildout of the Company’s new research and development, manufacturing and general office space in Bedford, Massachusetts, which the Company occupied as of December 31, 2018. Assets not yet in service consists of manufacturing equipment and furniture purchased for the new space that was not in service as of December 31, 2018.