Property and Equipment

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment 

Property and equipment consisted of the following (in thousands):

	June 30, 2019			December 31, 2018
Leasehold improvements	$	5,312		$	4,804
Lab and clean room equipment	14,199			13,787
Furniture and office equipment	14,846			15,145
Construction in progress	1,089			1,507
Property and equipment, gross	35,446			35,243
Less accumulated depreciation	(20,774		)	(17,819		)
Property and equipment, net	$	14,672		$	17,424

Depreciation expense for the six months ended June 30, 2019 and 2018, was approximately $3.3 million and $2.5 million, respectively, and approximately $1.6 million and $1.3 million for the three months ended June 30, 2019 and 2018, respectively.