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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 20, 2018
Feb. 28, 2018
Mar. 31, 2020
Mar. 31, 2019
Scenario, Forecast | Sublicense Agreement        
Subsequent Event [Line Items]        
Payment upon obligation     $ 7.0 $ 7.0
Subsequent Event | Sublicense Agreement        
Subsequent Event [Line Items]        
Payment upon obligation   $ 7.0    
Subsequent Event | CRG Servicing LLC        
Subsequent Event [Line Items]        
Debt instrument, face amount $ 175.0      
Maximum borrowing capacity 175.0      
Current borrowing capacity 100.0      
Additional borrowing capacity $ 75.0      
Debt maturity date Dec. 31, 2023      
Debt interest rate 9.50%