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Commitments and contingencies - Income Statement Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Lessee, Lease, Description [Line Items] |  |
Finance Lease Costs | $ 2,428 | $ 2,428
Operating Lease Costs | 1,156 | 1,129
Total lease cost | 5,647 | 5,675
Research and development |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease Costs | 2,428 | 2,428
Operating Lease Costs | 887 | 877
Total lease cost | 5,647 | 5,675
Other expense |  |
Lessee, Lease, Description [Line Items] |  |
Finance Lease Costs | 2,063 | 2,118
Selling, general and administrative |  |
Lessee, Lease, Description [Line Items] |  |
Operating Lease Costs | $ 269 | $ 252

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