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Fixed assets
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Fixed assets

5. Fixed assets

Fixed assets, net were as follows at December 31, 2022 and 2021:

December 31, 

    

2022

    

2021

Leasehold improvements

$

28,969

$

19,937

Computer equipment and software

 

15,332

 

13,812

Machinery and lab equipment

47,496

33,187

Furniture and fixtures

 

3,812

 

3,805

Assets in process

 

14,349

 

9,017

 

109,958

 

79,758

Less accumulated depreciation

 

(37,368)

 

(27,173)

Total

$

72,590

$

52,585

Depreciation expense was approximately $12.3 million, $9.4 million, and $6.6 million for the years ended December 31, 2022, 2021, and 2020, respectively.