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Stockholders' Equity - Stock Options and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Oct. 07, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Class Of Stock [Line Items]          
Vesting criteria probability of achievement percentage       0.00%  
Expense recorded       $ 0  
Weighted-average remaining contractual term of stock options exercisable       8 years 3 months 7 days  
Weighted-average remaining contractual term of stock options outstanding       8 years 3 months 7 days  
Number of common stock shares approved under ESPP   2,686,213   2,686,213  
Expected term   6 years 6 years 6 years 6 years
2012 Plan [Member]          
Class Of Stock [Line Items]          
Stock options granted   126,262   199,921  
2012 Plan [Member] | Executive Chairman [Member]          
Class Of Stock [Line Items]          
Stock options granted 30,000        
2012 Plan [Member] | Chief Scientific Officer [Member]          
Class Of Stock [Line Items]          
Stock options granted 7,500        
2016 Employee Stock Purchase Plan [Member]          
Class Of Stock [Line Items]          
Number of common stock shares approved under ESPP   75,000   75,000  
Employee subscription rate   15.00%   15.00%  
Compensation amount per employee       $ 25,000  
Number of shares per employee       500  
Fair market value at discount       85.00%  
Purchase period       6 months  
Initial offering period       2016-09  
Description of plan       Shares under the ESPP are purchased at 85 percent of the fair market value at the lower of (i) the closing price on the first trading day of the six-month purchase period or (ii) the closing price on the last trading day of the six-month purchase period.  
Expected term       6 months  
Shares available for purchase under ESPP   59,435   59,435