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Stockholders' Equity - Common Stock - Additional Information (Detail) - USD ($)
 6 Months Ended
Sep. 30, 2022
Jan. 29, 2021
Jan. 19, 2021
Class Of Stock [Line Items]      
Securities authorized for offer and sale, amount     $ 150,000,000.0
2021 Inducement Equity Plan [Member]      
Class Of Stock [Line Items]      
Common shares authorized to be issued 750,000    
2018 Sales Agreement [Member]      
Class Of Stock [Line Items]      
Equity sales agreement expiration date Feb. 22, 2021    
ATM Prospectus Supplement [Member]      
Class Of Stock [Line Items]      
Issuance of common stock from stock options exercises, net, Shares 1,580,862    
Value of shares sold under equity distribution agreement $ 21,700,000    
2021 Shelf [Member]      
Class Of Stock [Line Items]      
Common stock value reserved for future issuance 100,000,000.0    
IPO [Member]      
Class Of Stock [Line Items]      
Securities authorized for offer and sale, amount 100,000,000.0    
At-The-Market Facility [Member] | ATM Prospectus Supplement [Member]      
Class Of Stock [Line Items]      
Common stock value reserved for future issuance $ 28,300,000    
Issuance of common stock from stock options exercises, net, Shares 0    
At-The-Market Facility [Member] | ATM Prospectus Supplement [Member] | Maximum [Member]      
Class Of Stock [Line Items]      
Common stock value reserved for future issuance   $ 50,000,000.0