v3.26.1
Financial risk management - Additional Information (Detail) - EUR (€)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Statement Of Lineitems [Line Items]          
Currency translation reserve € 468,774   € 468,774   € (270,169)
Net foreign exchange gain (loss) € 1,639,889 € (5,867,219) 5,397,075 € (10,889,757)  
Issue of share capital     € 112,409,702