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Commitments and contingencies - Additional information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Lessee, Lease, Description [Line Items] |  |  |  |  |
Finance Lease Costs | $ 607 | $ 607 | $ 1,214 | $ 1,214 |
Operating lease costs | 281 | 252 | 561 | 511 |
Minimum payments committed to manufacturing organization | 1,000 |  | 1,000 |  | $ 1,000
Research and development |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Finance Lease Costs | 607 | 518 | 1,214 | 1,035 |
Operating lease costs | 228 | 103 | 457 | 213 |
Selling, general and administrative |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Finance Lease Costs | 0 | 89 | 0 | 179 |
Operating lease costs | $ 53 | $ 149 | $ 104 | $ 298 |

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