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Commitments and Contingencies - Leases, Office and laboratory space Cambridge (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2022
Dec. 31, 2021
Dec. 06, 2021
Oct. 31, 2017
Leases          
Operating lease right-of-use assets   $ 16,750,000 $ 14,666,000    
Office and laboratory space in Building 900, Babraham Research Campus, Cambridge          
Leases          
Lease total contractual Term       10 years  
Leases, term of contract       5 years  
Renewal term       10 years 5 years
Annual rent     600,000 $ 3,000,000.0 $ 500,000
Rent free period       6 months  
Security deposit       $ 0  
Operating lease right-of-use assets       11,600,000  
Lease liabilities       $ 11,100,000  
Discounted percentage for present value of lease payments       6.90% 7.70%
Estimated service charges payable     200,000    
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%      
Payment under the lease $ 100,000 $ 400,000 $ 700,000