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Stockholders' Equity - Schedule of Stock-based Compensation Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 475 $ 660
Research and development    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 107 121
General and administrative    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 368 $ 539