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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
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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)

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