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Commitments and contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Maximum exposure |  |  |  | $ 6,900
Accounts payable |  |  |  | $ 1,500
Loss in period | $ 2,100 |  |  |
Reversal of research and development costs |  | $ 6,300 | $ 1,500 |

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