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Fair value measurement - Warrants (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 22, 2020
Public warrants |  |  |  |
Fair value measurement of liabilities |  |  |  |
Warrants outstanding |  |  |  | 8,838,260
Private Placement Warrants |  |  |  |
Fair value measurement of liabilities |  |  |  |
Warrants outstanding | 6,535,304 | 6,535,304 |  |
Initial recognition |  |  | $ 480 |
Mezz Warrants |  |  |  |
Fair value measurement of liabilities |  |  |  |
Warrants outstanding | 3,187,500 | 3,187,500 |  |
Number of warrants issued | 3,187,500 |  |  |
Initial recognition |  | $ 13,665 |  |

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