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Leases - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 17, 2024
USD ($)
ft²
component
Jun. 01, 2022
USD ($)
ft²
period
building
May 31, 2022
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 16, 2024
ft²
component
Dec. 31, 2023
USD ($)
Leases                  
Operating lease, expense       $ 6,800 $ 7,200 $ 13,600 $ 14,300    
Finance lease liabilities- current       2,292   2,292     $ 3,000
Finance lease liabilities- noncurrent       15,574   15,574     17,184
Aggregate rent, Initial term       190,428   190,428      
Operating lease ROU assets       57,135   57,135     91,896
Operating Lease, Liability       92,832   92,832      
Gain on termination of lease components       2,200   2,179      
MassBio                  
Leases                  
Finance lease cost       300 $ 400 700 $ 700    
Finance lease liabilities- current       2,300   2,300     3,000
Finance lease liabilities- noncurrent       $ 15,600   $ 15,600     $ 17,200
Minimum                  
Leases                  
Operating lease, term of contract       2 months 12 days   2 months 12 days      
Maximum                  
Leases                  
Operating lease, term of contract       14 years 10 months 24 days   14 years 10 months 24 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   $ 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