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Leases - Narrative (Details)
$ in Thousands
1 Months Ended
Jan. 31, 2022
USD ($)
period
contract
Jul. 31, 2017
period
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Apr. 30, 2018
USD ($)
Lessee Lease Description [Line Items]          
Liabilities under lease     $ 70,976    
Right-of-use assets     63,956 $ 70,116  
Watertown Lease          
Lessee Lease Description [Line Items]          
Liabilities under lease $ 44,100        
Right-of-use assets $ 44,400        
Watertown Lease | Office and Laboratory Space          
Lessee Lease Description [Line Items]          
Lease contract term   10 years      
Number of extensions | period   1      
Lease extension term   5 years     5 years
Liabilities under lease         $ 15,100
Right-of-use assets         16,700
Construction costs         $ 1,500
Watertown Lease | Newly Leased Space          
Lessee Lease Description [Line Items]          
Number of extensions | period 1        
Lease extension term 5 years        
Liabilities under lease $ 20,100        
Right-of-use assets $ 20,100        
Lease term 10 years        
Tenant improvements $ 2,600        
Restricted cash     $ 3,300 $ 3,300  
Number of amended lease separate contracts | contract 2