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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € 8,774 | € (20,565) | € (31,345)
Actual tax charge | 4,389 | 4,341 | 2,335
IRES (state tax) [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Expected tax benefit (expense) at statutory tax rates | (2,106) | 4,936 | 7,523
Tax exempt income | 2,320 | 4,806 | 3,297
Aggregate effect of different tax rates in foreign jurisdictions | 191 | 322 | (139)
Italian regional tax | (78) | (24) | (78)
Non-deductible expenses | (5,152) | (5,575) | (4,521)
Tax effect on unremitted earnings | (515) | (1,024) | (430)
Non taxable gain from disposal of a subsidiary | 1,057 | 0 | 0
Chinese withholding tax on income not recoverable | (699) | (1,396) | (139)
Effect of net change in deferred tax assets unrecognised | 593 | (6,386) | (7,848)
Actual tax charge | (4,389) | (4,341) | (2,335)
Domestic [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | (1,551) | (17,049) | (24,808)
Foreign [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € 10,325 | € (3,516) | € (6,537)

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