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Stockholders' Equity - Fair Value of ESPP Shares (Detail) - $ / shares	3 Months Ended				9 Months Ended
	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Dividend yield	0.00%		0.00%		0.00%	0.00%
Volatility	100.83%		100.31%		99.38%	98.93%
Risk-free interest rate	4.32%		4.66%		3.75%	4.12%
Expected term	6 years		6 years		6 years	6 years
Grant date fair value	$ 0.32		$ 1.16		$ 0.47	$ 1.38
ESPP Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Dividend yield	0.00%	[1]	0.00%	[1]	0.00%	0.00%	[1]
Volatility	0.00%	[1]	0.00%	[1]	95.20%	0.00%	[1]
Risk-free interest rate	0.00%	[1]	0.00%	[1]	5.27%	0.00%	[1]
Expected term					6 months
Grant date fair value	$ 0	[1]	$ 0	[1]	$ 0.39	$ 0	[1]
[1] There were no participants in the ESPP for the purchase periods that commenced on March 1, 2023, September 1, 2023, or September 1, 2024.

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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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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