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Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2025
Class Of Stock [Line Items] |
Summary of Stock Option Activity | The following table summarizes the Company’s stock option activity from March 31, 2025 to September 30, 2025:
|  | Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at March 31, 2025 |  |  | 141,397 |  |  | $ | 22.66 |  |  | $ | — |
Options granted |  |  | 47,974 |  |  | $ | 1.81 |  |  | $ | — |
Options cancelled / forfeited |  |  | (2,552 | ) |  | $ | 14.51 |  |  | $ | — |
Options expired |  |  | (5,239 | ) |  | $ | 33.28 |  |  | $ | — |
Outstanding at September 30, 2025 |  |  | 181,580 |  |  | $ | 16.96 |  |  | $ | — |
Vested and Exercisable at September 30, 2025 |  |  | 56,268 |  |  | $ | 42.03 |  |  | $ | — |
Common Stock Reserved for Future Issuance | Common stock reserved for future issuance consisted of the following at September 30, 2025:
Common stock issuable pursuant to options outstanding and reserved under the 2012 Plan |  |  | 27,780 |
Common stock reserved under the 2012 Plan |  |  | — |
Common stock issuable pursuant to options outstanding and reserved under the A&R 2022 Plan |  |  | 149,634 |
Common stock reserved under the A&R 2022 Plan |  |  | 166,756 |
Common stock reserved under the ESPP |  |  | 3,708 |
Common stock reserved under the 2021 Inducement Equity Plan |  |  | 83 |
Common stock issuable pursuant to restricted stock units outstanding under the 2012 Plan |  |  | — |
Common stock issuable pursuant to restricted stock units outstanding under the A&R 2022 Plan |  |  | — |
Common stock issuable pursuant to options outstanding and reserved under the Inducement Plan |  |  | 4,166 |
Common stock issuable pursuant to outstanding pre-funded warrants |  |  | — |
Common stock issuable pursuant to outstanding common warrants |  |  | 539,060 |
Total at September 30, 2025 |  |  | 891,187 |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense for all stock-based awards consists of the following (in thousands):
|  | Three Months Ended |  |  | Three Months Ended |  |  | Six Months Ended |  |  | Six Months Ended |
|  | September 30, 2025 |  |  | September 30, 2024 |  |  | September 30, 2025 |  |  | September 30, 2024 |
Research and development |  | $ | 13 |  |  | $ | 25 |  |  | $ | 26 |  |  | $ | 51 |
General and administrative |  |  | 59 |  |  |  | 130 |  |  |  | 124 |  |  |  | 260 |
Total |  | $ | 72 |  |  | $ | 155 |  |  | $ | 150 |  |  | $ | 311 |
Fair Value of Employee Stock Options | The fair value of stock options was estimated at the grant date using the following weighted average assumptions:
|  | Three Months Ended |  |  | Three Months Ended |  |  | Six Months Ended |  |  | Six Months Ended |
|  | September 30, 2025 |  |  | September 30, 2024 |  |  | September 30, 2025 |  |  | September 30, 2024 |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Volatility |  |  | 111.00 | % |  |  | 99.00 | % |  |  | 112.30 | % |  |  | 99.37 | %
Risk-free interest rate |  |  | 3.83 | % |  |  | 3.64 | % |  |  | 3.87 | % |  |  | 3.75 | %
Expected life of options |  | 6 years |  |  | 6 years |  |  | 6 years |  |  | 6 years |
Weighted average grant date fair value |  | $ | 1.50 |  |  | $ | 5.11 |  |  | 1.53 |  |  | $ | 5.67 |
Summary of Warrant Activity | The following table summarizes the Company’s Common Warrant activity from March 31, 2025 to September 30, 2025:
|  | Number of Warrants |  |  | Exercise Price |
Outstanding at March 31, 2025 |  |  | 539,060 |  |  | $ | 9.60 |
Issued |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |
Outstanding at September 30, 2025 |  |  | 539,060 |  |  | $ | 9.60 |
Restricted stock units (RSUs) [Member] |
Class Of Stock [Line Items] |
Summary of Company's RSUs Activity | The following table summarizes the Company’s RSUs activity for the three months ended September 30, 2025:
|  | Number of Shares |  |  | Weighted Average Price |
Unvested at March 31, 2025 |  |  | 8,165 |  |  | $ | 6.57 |
Granted |  |  | — |  |  | $ | — |
Vested |  |  | (8,165 | ) |  | $ | 6.57 |
Cancelled / forfeited |  |  | — |  |  | $ | — |
Unvested at September 30, 2025 |  |  | — |  |  | $ | — |
ESPP Shares [Member] |
Class Of Stock [Line Items] |
Fair Value of Employee Stock Options | The fair value of ESPP shares was estimated at the purchase period commencement date using the following assumptions:
|  | Three Months Ended |  |  | Three Months Ended |  |  | Six Months Ended |  |  | Six Months Ended |
|  | September 30, 2025* |  |  | September 30, 2024 |  |  | September 30, 2025* |  |  | September 30, 2024 |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Volatility |  |  | 0.00 | % |  |  | 95.20 | % |  |  | 0.00 | % |  |  | 95.20 | %
Risk-free interest rate |  |  | 0.00 | % |  |  | 5.27 | % |  |  | 0.00 | % |  |  | 5.27 | %
Expected term |  |  | — |  |  | 6 months |  |  |  | — |  |  | 6 months |
Grant date fair value |  | $ | — |  |  | $ | 4.68 |  |  | $ | — |  |  | $ | 4.68 |
*There were no participants in the ESPP for the purchase periods that commenced on March 1, 2025.

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