Property and Equipment

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment 

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

	March 31, 2021		December 31, 2020
Leasehold improvements	$	6,010	$	6,010
Laboratory and clean room equipment	14,828		15,524
Furniture and equipment	15,137		15,295
Construction in progress	4,295		3,321
Asset retirement cost	819		785
Property and equipment, gross	41,089		40,935
Less accumulated depreciation	(30,045)		(29,498)
Property and equipment, net	$	11,044	$	11,437

Depreciation expense for each of the three months ended March 31, 2021 and 2020 is summarized in the table below (amounts in thousands):

	Three Months Ended March 31,
	2021		2020
Depreciation expense	$	1,161	$	1,506

Depreciation expense is allocated amongst cost of sales, research and development, and selling, general, and administrative expense on the unaudited condensed consolidated statements of operations.