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Adjusted Earnings Before Interest, Tax, Depreciation and Amortisation (Adjusted EBITDA) - Summary of Reconciliation of Adjusted EBITDA to Profit (Loss) (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Reconciliation Of Consolidated Adjusted Ebitda [Abstract] |  |  |
Profit/(loss) for the year | € 4,385 | € (24,906) | € (33,680)
Income tax expense | 4,389 | 4,341 | 2,335
Profit / (loss) before tax | 8,774 | (20,565) | (31,345)
Adjustments for: |  |  |
- Addition (subtraction) of net finance income/(costs) | (331) | 11,415 | 9,868
- Addition (subtraction) of share of profit/(loss) equity-method inv. | (3,561) | (1,455) | (1,011)
Addition of depreciation | 20,281 | 23,258 | 24,196
Addition of amortisation | 1,090 | 907 | 917
- Subtraction of government grants related to PPE | (1,306) | (1,241) | (1,626)
Adjusted EBITDA | € 24,947 | € 12,319 | € 999

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