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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Future aggregate milestone payments $ 74,500,000  
Percentage of Purchase Requirement 100.00% 100.00%
S*Bio Purchase Agreement    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Accrued payment for potential future payments $ 0  
CyDex License Agreement    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Accrued payment for potential future payments 0  
Presage License Agreement    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Accrued payment for potential future payments $ 0