Property and equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property and equipment

3. Property and equipment

The components of property and equipment were as follows as of December 31, 2021 and 2020:

(in thousands)	2021			2020
Leasehold improvements	$	5,940		$	5,655
Lab equipment		5,709			4,833
Computer equipment		994			942
Furniture and office equipment		472			459
Vehicles		305			296
Asset under construction		22			65
Total, at cost		13,442			12,250
Accumulated depreciation		(7,262	)		(4,243	)
Total, net	$	6,180		$	8,007

During the years ended December 31, 2021 and December 31, 2020, depreciation expense was $3.0 million and $2.7 million, respectively. Finance leases for vehicles and lab equipment are also included in property and equipment on the consolidated balance sheets (Note 6).