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Stock-based compensation - Assumptions to determine grant-date fair value of stock options (Details) - Stock options	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock-Based Compensation
Risk-free interest rate	4.34%	3.08%	3.69%	2.61%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years	6 years
Expected volatility	72.70%	74.50%	73.90%	75.50%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%

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.

+ References

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- Definition

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

+ References

No definition available.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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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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