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Stockholders' Equity - Restricted Stock Units and Performance-Based Restricted Stock Units - Additional Information (Detail) - Restricted stock units (RSUs) [Member]
12 Months Ended
Aug. 14, 2018
Installment
shares
Mar. 31, 2020
shares
Mar. 31, 2019
shares
Class Of Stock [Line Items]      
Restricted stock awards granted   585,926  
Number of shares allocated   480,256 2,080,723
CMO [Member]      
Class Of Stock [Line Items]      
Number of shares allocated 160,714    
Vesting period 4 years    
Number of installment | Installment 12