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Income taxes - Summary of Income Tax Expense (Detail) - EUR (€)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Major components of tax expense (income) [abstract]        
Income tax expense € (70,623) € (94,178) € (355,740) € (154,835)
Income tax expense € (70,623) € (94,178) € (355,740) € (154,835)