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Leases - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 17, 2024
USD ($)
ft²
component
Jun. 01, 2022
USD ($)
ft²
period
building
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 16, 2024
ft²
component
Dec. 31, 2023
USD ($)
Leases                
Operating lease, expense     $ 5,900 $ 7,100 $ 19,500 $ 21,500    
Finance lease liabilities- current     2,642   2,642     $ 3,000
Finance lease liabilities- noncurrent     15,574   15,574     17,184
Aggregate rent, Initial term     189,608   189,608      
Operating lease ROU assets     59,465   59,465     91,896
Operating Lease, Liability     96,883   96,883      
Gain on termination of lease components         2,179      
MassBio                
Leases                
Finance lease cost     400 $ 400 1,000 $ 1,100    
Finance lease liabilities- current     2,600   2,600     3,000
Finance lease liabilities- noncurrent     $ 15,600   $ 15,600     $ 17,200
Minimum                
Leases                
Operating lease, term of contract     1 month 6 days   1 month 6 days      
Maximum                
Leases                
Operating lease, term of contract     14 years 8 months 12 days   14 years 8 months 12 days      
Renewal term     15 years   15 years      
Hopewell Campus                
Leases                
Area of real estate property | ft² 93,461           220,500  
Operating lease ROU assets $ 1,600              
Operating Lease, Liability $ 1,600              
Number of separate lease components | component             4  
Number of separate lease components terminated | component 3              
Gain on termination of lease components         $ 2,200      
Incremental borrowing rate of interest used to remeasure the remaining components of operating lease 7.50%              
Return of letter of credit pertaining to amendments to operating lease agreement $ 2,500              
Warren Premises                
Leases                
Operating lease, term of contract   17 years            
Number of buildings leased | building   2            
Area of real estate property | ft²   360,000            
Renewal term   5 years            
Number of renewable terms | period   3            
Lessee, Operating Lease, Existence of Option to Extend [true false]   true            
Aggregate rent, Initial term   $ 163,000            
Operating lease ROU assets   28,900            
Operating Lease, Liability   $ 28,900            
Base rent abatement period   3 years            
Base rent abatement   $ 18,600            
Aggregate rent net of base rate abatement, initial term   144,400            
Allowance for lease improvements   36,200            
Payment due from lessor at issuance of temporary certificate of occupancy   $ 5,000