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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
May 30, 2018
Jun. 30, 2021
Mar. 31, 2021
Takeda License Agreement      
Supply Commitment [Line Items]      
Royalties payable   $ 0.9 $ 0.3
Agreement term after first commercial sale   10 years  
Takeda Commercial Supply Agreement      
Supply Commitment [Line Items]      
Agreement term 5 years    
Automatic renewal term   1 year  
Termination notice term   12 months  
Termination notice term, uncured material breach   90 days  
Termination notice term, open purchase orders filed   180 days