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).