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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € 3,561 | € 8,774 | € (20,565)
Actual tax charge | 2,273 | 4,389 | 4,341
IRES (state tax) [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Expected tax benefit (expense) at statutory tax rates | (855) | (2,106) | 4,936
Tax exempt income | 2,618 | 2,320 | 4,806
Aggregate effect of different tax rates in foreign jurisdictions | (79) | 191 | 322
Italian regional tax | (28) | (78) | (24)
Non-deductible expenses | (1,635) | (5,152) | (5,575)
Tax effect on unremitted earnings | (755) | (515) | (1,024)
Non taxable gain from disposal of a subsidiary | 0 | 1,057 | 0
Chinese withholding tax on income not recoverable | 0 | (699) | (1,396)
Effect of net change in deferred tax assets unrecognised | (1,539) | 593 | (6,386)
Actual tax charge | (2,273) | (4,389) | (4,341)
Domestic [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | (7,448) | (1,551) | (17,049)
Foreign [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € 11,009 | € 10,325 | € (3,516)

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