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Stockholders' Equity - Fair Value of ESPP Shares (Detail) - $ / shares	3 Months Ended			9 Months Ended
	Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2023		Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Dividend yield	0.00%		0.00%	0.00%		0.00%
Volatility	100.31%		95.93%	98.93%		95.43%
Risk-free interest rate	4.66%		3.97%	4.12%		3.21%
Expected term	6 years		6 years	6 years		6 years
Grant date fair value	$ 1.16		$ 1.23	$ 1.38		$ 1.96
ESPP Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Dividend yield	0.00%	[1]	0.00%	0.00%	[1]	0.00%
Volatility	0.00%	[1]	0.00%	0.00%	[1]	86.58%
Risk-free interest rate	0.00%	[1]	0.00%	0.00%	[1]	3.34%
Expected term						6 months
Grant date fair value	$ 0	[1]	$ 0	$ 0	[1]	$ 0.82
[1] There were no participants in the 2016 ESPP or the 2023 ESPP for the purchase periods beginning September 1, 2022, March 1, 2023 or September 1, 2023.

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- 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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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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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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