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Commitments and contingencies - Leases, Office and laboratory space Cambridge (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Dec. 06, 2021
Jan. 31, 2023
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2017
Leases                
Operating lease right-of-use assets       $ 12,025 $ 13,169      
Lease liabilities       13,022        
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            
Rental payment   $ 2,300            
Rent free period   2 months            
Security deposit   $ 500            
Operating lease right-of-use assets   5,800            
Lease liabilities   $ 5,800            
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              
Rent free period 6 months              
Security deposit $ 0              
Operating lease right-of-use assets 11,600              
Lease liabilities $ 11,100              
Discounted percentage for present value of lease payments 6.90%              
Office and laboratory space in Building 900, Babraham Research Campus, Cambridge                
Leases                
Renewal term             5 years  
Annual rent             $ 600  
Estimated service charges payable             $ 200  
Office and laboratory space in Building 900, Babraham Research Campus, Cambridge | General and administrative expenses                
Leases                
Loss on lease termination     $ 300          
Office and laboratory space in Lexington, Massachusetts                
Leases                
Annual rent       $ 800        
Security deposit               $ 200
Discounted percentage for present value of lease payments       7.00%        
Payments for the extended lease remaining         $ 700 $ 200