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Lease liabilities (non-current and current) - Additional information (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]    
Borrowings interest rate 6.308%  
Increase (decrease) in lease liability € 42,613 € 26,254,000
Bottom Of Range [Member]    
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]    
Borrowings interest rate 3.00% 3.00%
Top of Range [member] | Lease liabilities [member]    
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]    
Borrowings interest rate 12.00% 12.00%