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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%