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Fixed assets
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Fixed assets

5. Fixed assets

Fixed assets, net were as follows at December 31, 2021 and 2020:

December 31, 

    

2021

    

2020

Leasehold improvements

$

19,937

$

8,072

Computer equipment and software

 

13,812

 

11,471

Machinery and lab equipment

33,187

23,430

Furniture and fixtures

 

3,805

 

3,844

Assets in process

 

9,017

 

5,076

 

79,758

 

51,893

Less accumulated depreciation

 

(27,173)

 

(18,062)

Total

$

52,585

$

33,831

Depreciation expense was approximately $9.4 million, $6.6 million, and $4.7 million for the years ended December 31, 2021, 2020, and 2019, respectively.