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Financial risk management - Disclosure of sensitivity Analysis of possible change in the main foreign currencies against the Euro (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sensitivity analysis of possible change in the main foreign currencies against the Euro [Line Items]    
Increase /(decrease) in loss before tax if Euro strengthens by 5% € (7,363) € (5,037)
Increase /(decrease) in loss before tax if Euro weakens by 5% 7,363 5,037
USD    
Sensitivity analysis of possible change in the main foreign currencies against the Euro [Line Items]    
Increase /(decrease) in loss before tax if Euro strengthens by 5% (7,610) (5,418)
Increase /(decrease) in loss before tax if Euro weakens by 5% 7,610 5,418
CNY    
Sensitivity analysis of possible change in the main foreign currencies against the Euro [Line Items]    
Increase /(decrease) in loss before tax if Euro strengthens by 5% 138 180
Increase /(decrease) in loss before tax if Euro weakens by 5% (138) (180)
HKD    
Sensitivity analysis of possible change in the main foreign currencies against the Euro [Line Items]    
Increase /(decrease) in loss before tax if Euro strengthens by 5% 1 123
Increase /(decrease) in loss before tax if Euro weakens by 5% (1) (123)
GBP    
Sensitivity analysis of possible change in the main foreign currencies against the Euro [Line Items]    
Increase /(decrease) in loss before tax if Euro strengthens by 5% 108 78
Increase /(decrease) in loss before tax if Euro weakens by 5% € (108) € (78)