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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Summary of significant accounting policies |  |
Cash equivalents | $ 120,300 | $ 89,900
Restricted cash | 1,703 | 1,703
Research and development incentives | 1,604 | 1,773
Research and development incentives receivable, current | 1,619 | 3,725
Unrealized gains (loss) on short-term investments | (300) | 419
Foreign currency translation gain (loss) | $ 255 | 174
Minimum percentage of benefit recognized is being realized upon ultimate settlement | 50.00% |
Maximum | United Kingdom |  |
Summary of significant accounting policies |  |
Percentage of qualifying research and development expenses reimbursed by government | 16.20% |
Operating Lease |  |
Summary of significant accounting policies |  |
Restricted cash | $ 1,700 | $ 1,700

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