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Earnings/(loss) per share - Summary of Basic and Diluted Earnings (Losses) per Share (Detail) - € / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings per share [abstract]      
Weighted average number of ordinary shares 55,073,045 54,899,456 54,853,045
Basic earnings/(losses) per share € (0.29) € (0.01) € 0.07
Diluted earnings/(losses) per share € (0.29) € (0.01) € 0.07