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Leases - Additional Information (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Aug. 31, 2021
USD ($)
Jul. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Lease
Sep. 30, 2020
USD ($)
Lessee Lease Description [Line Items]            
Number of operating leases | Lease         5  
Lessee, operating lease, existence of option to terminate         false  
Operating minimum lease payments         $ 913 $ 513
Office Space | Cambridge, Massachusetts            
Lessee Lease Description [Line Items]            
Operating lease, existence of option to extend false     true    
Operating lease, option to extend, description extend the lease term until December 2021     extend the lease term until October 2021    
Operating minimum lease payments $ 100     $ 200    
Operating lease, remaining extended lease term 2 months     5 months    
Office Space | Cambridge, Massachusetts | New Lease Agreement            
Lessee Lease Description [Line Items]            
Operating minimum lease payments   $ 3,200        
Operating lease, remaining extended lease term   3 years        
Office and Laboratory Space | Montreal, Quebec            
Lessee Lease Description [Line Items]            
Operating lease, existence of option to extend     false      
Operating lease, option to extend, description     extend the lease term until July 2025      
Operating minimum lease payments   $ 1,100 $ 500      
Operating lease, remaining extended lease term     4 years      
Operating lease, lease not yet commenced, description   As of September 30, 2021, the amended agreement has not commenced, and is expected to result in $1.1 million of minimum lease payments over the remaining lease term