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Stockholders' Equity - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]            
Total stock-based compensation expense $ 157 $ 544 $ 1,307 $ 1,877 $ 2,377 $ 2,256
Research and development            
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]            
Total stock-based compensation expense 40 117 87 363 473 419
General and administrative            
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]            
Total stock-based compensation expense $ 117 $ 427 $ 1,220 $ 1,514 $ 1,904 $ 1,837