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Financial Risk Management - Additional Information (Detail) - EUR (€)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial investments at fair value through profit or loss    
Basis points change in interest rates 100.00%  
Increase (decrease) in profit or loss € 1,951,000 € (1,317,000)
Fair value adjustment on derivative warrant liabilities 6,476,000  
Capital commitments € 0 0
Percentage Of Increase Decrease In Warrant Price 1.00%  
Warrant [Member]    
Financial investments at fair value through profit or loss    
Adjustments for increase (decrease) in derivative financial liabilities € 31,000 58,000
Other price risk [member]    
Financial investments at fair value through profit or loss    
Financial investments at fair value through profit or loss € 3,119,000 € 5,834,000