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Property and equipment, net
 12 Months Ended
Dec. 31, 2023
Property and equipment, net [Abstract]  
Property and equipment, net

5. Property and equipment, net

Property and equipment, net, consists of the following (in thousands):


  
2023
     2022  
Leasehold property improvements
  
$
20,020
    
$
19,095
  
Laboratory equipment
    
39,534
      
32,265
  
Office equipment and other assets
    
1,922
      
1,710
  
Construction in progress
    
46
      
431
  
Total property and equipment, gross
    
61,522
      
53,501
  
Less: Accumulated Depreciation
    
(52,307
)
    
(45,668
)
Total property and equipment, net
  
$
9,215
    
$
7,833
  

Depreciation expense for the year ended December 2023, 2022 and 2021 was $4.1 million, $5.3 million and $7.6 million, respectively.