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Strategic License Agreements (Details) - Strategic license agreement - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Oct. 31, 2019
Universities of Antwerp and Leuven in Belgium (the Universities) and Amendment Fee            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Refund liability   $ 7.0   $ 7.0    
Research and development expense   7.0   7.0    
Universities of Antwerp and Leuven in Belgium (the Universities) and Amendment Fee | Shinyaku Agreement | Subsequent event            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
One-time amendment fee $ 7.0          
Future regulatory and sales-based milestones payable rate (percent) 15.00%          
Tevard Biosciences (Tevard)            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Upfront payment           $ 5.2
Promissory notes purchased           $ 5.0
Stated interest rate (percent)           3.50%
Research and development expense   0.8   2.4    
Option maintenance fees     $ 1.5   $ 4.5  
Maximum exposure to future loss   $ 5.0   $ 5.0    
Advance termination notice allowed under the license agreement       180 days