v3.26.3
Financial Risk Management - Additional Information (Detail) - EUR (€)
6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financial investments at fair value through profit or loss      
Basis points change in interest rates 100.00%    
Increase (decrease) in profit or loss € 665,000 € 907,000  
Capital commitments     € 0
Percentage Of Increase Decrease In Warrant Price 10.00%    
Warrants [member]      
Financial investments at fair value through profit or loss      
Adjustments for increase (decrease) in derivative financial liabilities € 731,000   9,000
Other price risk [member]      
Financial investments at fair value through profit or loss      
Financial investments at fair value through profit or loss € 7,305,000   € 70,000