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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 05, 2020
Nov. 30, 2019
Feb. 28, 2018
Sep. 30, 2022
Sep. 30, 2022
Mar. 31, 2015
Leased assets            
Sublease income       $ 700 $ 2,000  
Lease Cost:            
Operating lease cost       2,169 6,506  
Variable lease cost       504 1,408  
Total lease cost       $ 2,673 7,914  
Operating cash flows used for operating leases         $ 6,843  
Weighted average remaining lease term       2 years 8 months 12 days 2 years 8 months 12 days  
Weighted average incremental borrowing rate       7.50% 7.50%  
620 Memorial Drive, Cambridge MA            
Leased assets            
Term of lease           5 years
Option to extend the term     true      
Renewal term     5 years      
Sublease annual base rent $ 1,900          
620 Memorial Drive, Cambridge MA | Minimum            
Leased assets            
Rent for facility lease     $ 1,400      
620 Memorial Drive, Cambridge MA | Maximum            
Leased assets            
Rent for facility lease     $ 1,700      
301 Binney St, Cambridge MA            
Leased assets            
Option to extend the term   true        
Renewal term   2 years        
Base rent   $ 6,900        
Annual upward adjustment (as a percent)   3.50%        
Incentive to lease   $ 14,100        
Letter of credit   $ 2,300