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Stockholders' Equity - Fair Value of ESPP Shares (Detail) - $ / shares

3 Months Ended

6 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Sep. 30, 2024

Sep. 30, 2023

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Dividend yield

0.00%

0.00%

^[1]

0.00%

0.00%

Volatility

99.00%

0.00%

^[1]

99.37%

98.51%

Risk-free interest rate

3.64%

0.00%

^[1]

3.75%

3.95%

Expected term

6 years

0 years

^[1]

6 years

6 years

Grant date fair value

$ 0.43

$ 0

^[1]

$ 0.47

$ 1.45

ESPP Shares [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Dividend yield

0.00%

0.00%

^[2]

0.00%

0.00%

^[2]

Volatility

95.20%

0.00%

^[2]

95.20%

0.00%

^[2]

Risk-free interest rate

5.27%

0.00%

^[2]

5.27%

0.00%

^[2]

Expected term

6 months

6 months

Grant date fair value

$ 0.39

$ 0

^[2]

$ 0.39

$ 0

^[2]

[1]	There were no stock options granted during the three months ended September 30, 2023.
[2]	There were no participants in the ESPP for the purchase periods that commenced on March 1, 2023 September 1, 2023.

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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