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Regeneron License and Collaboration Arrangement - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jul. 29, 2016
Sep. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2018
Dec. 31, 2017
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                      
Contract Assets                 $ 0.0    
Licence agreement cumulative revenue recognised               $ 35.3      
Regeneron Pharmaceuticals, Inc.                      
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                      
Contract Assets             $ 10.0        
Non refundable upfront payment received               25.0      
Additional payment for research funding received               $ 20.0   $ 5.0 $ 5.0
License agreement termination description               twelve years      
Contract research term period   5 years                  
Upfront payment $ 25.0 $ 25.0           $ 25.0      
Licence agreement cumulative revenue recognised     $ 3.4   $ 5.0   $ 10.0 4.3      
License agreement cumulative revenue reduction recognised           $ 6.6          
Increase in estimated transaction price         $ 10.0            
Contract liability               10.1 19.4    
Regeneron Pharmaceuticals, Inc. | Change in Accounting Estimate                      
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                      
License agreement cumulative revenue reduction recognised       $ 4.0              
Regeneron Pharmaceuticals, Inc. | Maximum                      
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                      
Licence agreement additional amount payable of option exercise fees               $ 100.0      
Regeneron Pharmaceuticals, Inc. | Minimum [Member]                      
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]                      
Licence agreement cumulative revenue recognised                 $ 25.6