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Related-party transactions - Narrative (Details)
$ in Thousands
2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2023
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 03, 2021
agreement
Related Party Transaction [Line Items]              
Other income (expense)       $ (263,140) $ (313,948) $ (138,170)  
Total operating expenses       354,636 368,470 386,292  
Number of transition services agreements | agreement             2
Initial term of transition services agreement             2 years
Other income, net       6,055 21,647 18,056  
Accrued expenses and other current liabilities $ 55,410 $ 55,410   54,678 55,410    
Accounts payable 6,024 $ 6,024   7,208 6,024    
Bluebird Bio | Separation Agreement              
Related Party Transaction [Line Items]              
Other income (expense) (200)     2,800      
Total operating expenses $ 1,800     200      
Bluebird Bio | Transition Services Agreement              
Related Party Transaction [Line Items]              
Other income, net       10,000 1,400    
Operating expenses       1,000 700    
Area of sublease, as a percent   30.00%          
Sublease income       4,900 800    
Amount due to related party       100      
Amount due from related party       $ 1,900      
Bluebird Bio | Transition Services Agreement | Forecast              
Related Party Transaction [Line Items]              
Area of sublease, as a percent     23.00%        
Bluebird Bio | Management Costs and Corporate Support Services              
Related Party Transaction [Line Items]              
Allocations for management costs and corporate support services provided to the Company         $ 55,300 $ 76,600