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Significant Events in the Reporting Period - Additional Information (Detail) € in Thousands, $ in Millions | Jan. 29, 2024 USD ($) | Jun. 30, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Jun. 30, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
--- | --- | --- | --- | --- | ---
Significant Events In The Reporting Period LineItems |  |  |  |  |
Balance of equity | € |  | € 321,133 | € 145,697 | € (64,841) | € (263,348)
Third Party Investors [Member] |  |  |  |  |
Significant Events In The Reporting Period LineItems |  |  |  |  |
Commitment from investors | $ | $ 150 |  |  |  |
Ownership percentage | 42.00% |  |  |  |

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