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Income tax / (expense) (Details) € in Thousands, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Jun. 30, 2024 EUR (€) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 USD ($)
Disclosure Of Income Tax [Line Items] |  |  |  |  |
Current tax expense (income) |  | € 0 |  |  |
Unused tax losses with no expiration date |  | 483,570 |  | € 483,570 |
Unused tax losses subject to expiration |  | € 15,181 | $ 16,775 | € 15,181 | $ 16,775
Forecast |  |  |  |  |
Disclosure Of Income Tax [Line Items] |  |  |  |  |
Applicable tax rate | 0.00% |  |  |  |

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