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Commitments and contingencies - Leases, Office and laboratory space Cambridge (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 06, 2021
Jan. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2017
Leases            
Lease liabilities     $ 14,258,000      
Operating lease right-of-use assets     13,169,000 $ 13,658,000    
Office and laboratory space in Cambridge Massachusetts            
Leases            
Lease total contractual Term   3 years        
Renewal term   2 years        
Leases, term of contract   3 years        
Annual rent   $ 2,100,000        
Rental payment   $ 2,300,000        
Rent free period   2 months        
Security deposit   $ 500,000        
Lease liabilities   $ 5,800,000        
Discounted percentage for present value of lease payments   9.00%        
New Office and laboratory space in Cambridge, United Kingdom            
Leases            
Lease total contractual Term 10 years          
Renewal term 10 years          
Leases, term of contract 5 years          
Annual rent $ 3,000,000.0          
Rent free period 6 months          
Security deposit $ 0          
Lease liabilities $ 11,100,000          
Discounted percentage for present value of lease payments 6.90%          
Operating lease right-of-use assets $ 11,600,000          
Office and laboratory space in Building 900, Babraham Research Campus, Cambridge            
Leases            
Renewal term         5 years  
Annual rent         $ 600,000  
Estimated service charges payable         $ 200,000  
Office and laboratory space in Building 900, Babraham Research Campus, Cambridge | General and administrative expenses            
Leases            
Loss on lease termination     300,000      
Office and laboratory space in Lexington, Massachusetts            
Leases            
Annual rent     $ 800,000      
Security deposit           $ 200,000
Discounted percentage for present value of lease payments     7.00%      
Payments for the extended lease remaining     $ 700,000 $ 200,000