Stock-based compensation - Assumptions to determine grant-date fair value of stock options (Details) - Stock options	3 Months Ended
Jun. 30, 2024	Jun. 30, 2023
Stock-Based Compensation
Risk-free interest rate	4.43%	3.60%
Expected term (in years)	6 years	6 years
Expected volatility	76.30%	74.10%
Expected dividend yield	0.00%	0.00%

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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+ Details