v3.25.2
Leases - Narrative (Details)
$ in Thousands
 1 Months Ended 6 Months Ended
Mar. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
ft²
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Aug. 31, 2024
ft²
Nov. 30, 2021
Lessee, Lease, Description [Line Items]            
Restricted cash   $ 13,691   $ 14,062    
Operating lease right-of-use assets   120,203   47,156    
Total operating lease liability   119,736        
Prepaid expenses   (3,032)   (6,777)    
Total payments under dispute   13,900   10,800    
Reduction in operating lease liabilities   2,053 $ 5,672      
60 First Street, Cambridge, Massachusetts Lease            
Lessee, Lease, Description [Line Items]            
Term of contract, lease not yet commenced (in years)           10 years
Operating lease, extension (in years)           10 years
Restricted cash   13,100   $ 13,100    
Operating lease right-of-use assets   76,800 44,900      
Total operating lease liability   $ 78,600 33,600      
60 First Street, Cambridge, Massachusetts Lease | Revision of Prior Period, Reclassification, Adjustment            
Lessee, Lease, Description [Line Items]            
Operating lease right-of-use assets     11,300      
Prepaid expenses     $ 11,300      
480 Arsenal Amendment            
Lessee, Lease, Description [Line Items]            
Area of operating lease | ft²         16,000  
500 Arsenal Lease            
Lessee, Lease, Description [Line Items]            
Term of contract, lease not yet commenced (in years)   11 months        
Restricted cash   $ 600        
Operating lease right-of-use assets $ 7,000          
Total operating lease liability 5,500          
Area of operating lease | ft²   48,500        
Tenant Improvements   $ 2,400        
Reduction in operating lease liabilities 3,100          
Reduction to operating lease right-of-use assets $ 3,100          
500 Arsenal Lease, Additional Tenant Improvement Allowance            
Lessee, Lease, Description [Line Items]            
Tenant Improvements   $ 1,200        
Expansion Space            
Lessee, Lease, Description [Line Items]            
Area of operating lease | ft²         9,400