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Fixed assets
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Fixed assets

5. Fixed assets

Fixed assets, net were as follows at December 31, 2020 and 2019:

December 31, 

    

2020

    

2019

Leasehold improvements

$

8,072

$

5,039

Computer equipment and software

 

11,471

 

8,069

Machinery and lab equipment

23,430

13,466

Furniture and fixtures

 

3,844

 

3,567

Assets in process

 

5,076

 

3,232

 

51,893

 

33,373

Less accumulated depreciation

 

(18,062)

 

(11,824)

Total

$

33,831

$

21,549

Depreciation expense was approximately $6.6 million, $4.7 million, and $2.6 million for the years ended December 31, 2020, 2019, and 2018, respectively.