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Income Tax Expense - Summary of Net Profit/(Loss) Before Income Taxes and Non-controlling Interest (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € (14,698) | € (15,072) | € 3,561
Actual tax charge | 684 | 1,090 | 2,273
IRES (state tax) [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Expected tax benefit (expense) at statutory tax rates | 3,527 | 3,617 | (855)
Tax exempt income | 1,657 | 4,530 | 2,618
Aggregate effect of different tax rates in foreign jurisdictions | (254) | (481) | (79)
Italian regional tax | (11) | (8) | (28)
Non-deductible expenses | (3,140) | (5,675) | (1,635)
Tax effect on unremitted earnings | 0 | 0 | (755)
Chinese withholding tax on income not recoverable | 0 | (1,100) | 0
Effect of net change in deferred tax assets unrecognised | (2,463) | (1,973) | (1,539)
Actual tax charge | (684) | (1,090) | (2,273)
Domestic [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | (6,199) | (12,078) | (7,448)
Foreign [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € (8,499) | € (2,994) | € 11,009

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