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Group Information - Summary Of Transactions And Balances With Related Parties (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]      
Revenue € 328    
Other financial interest 115 € 266 € 23
Professional services 11,591 14,129 15,484
Statement of financial position [abstract]      
Accounts receivables and accounts payables 369    
Impairment of financial assets 0 (1,411) 0
Borrowings (229,189) (144,849)  
Shareholders      
Analysis of income and expense [abstract]      
Revenue 328 67  
Interest on convertible bonds     3
Statement of financial position [abstract]      
Accounts receivables and accounts payables € 369    
Joint Venture      
Analysis of income and expense [abstract]      
Interest   47  
Impairment of financial assets   (1,945)  
Interest on convertible bonds     61
Statement of financial position [abstract]      
Current loans granted to Joint Venture   1,411  
Receivables from Joint Venture   534  
Impairment of financial assets   (1,945)  
Related parties      
Analysis of income and expense [abstract]      
Revenue   67  
Interest   47  
Impairment of financial assets   (1,945)  
Interest on convertible bonds     € 64
Statement of financial position [abstract]      
Current loans granted to Joint Venture   1,411  
Receivables from Joint Venture   534  
Impairment of financial assets   € (1,945)