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Related Party Transactions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 01, 2022
item
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Related Party Transactions            
Accrued expenses for related parties   $ 0.3   $ 0.3    
Flagship Pioneering Inc.            
Related Party Transactions            
Other income     $ 0.1   $ 0.3  
Cash payments received     0.1 2.4 0.3  
Outstanding receivables related to other current assets   0.0   0.0    
Flagship Pioneering Inc. | Shared Space Agreement            
Related Party Transactions            
Cash payments received   0.8        
Number of successive periods for renewal of sublease | item 6          
Sublease renewal term 1 month          
Flagship Pioneering Inc. | Shared Space Agreement | Maximum            
Related Party Transactions            
Other income   0.1   0.1    
Lilly | Lilly License and Collaboration Agreement            
Related Party Transactions            
Revenue from related party   4.3 $ 1.9 10.3 $ 7.6  
Deferred revenue from related party   12.1   12.1   $ 22.4
Lilly | Lilly License and Collaboration Agreement | Maximum            
Related Party Transactions            
Accounts receivable   $ 0.1   $ 0.1   $ 0.1