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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

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