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Income Tax Expense - Summary of Total Income Taxes (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Income Taxes [line items] |  |  |  |
Current tax expense income | € (1,985) | € (7,556) | € (3,817) |
Deferred tax liability asset | (350) | 127 | 931 |
Total | (2,335) | (7,429) | (2,886) | [1]
Domestic [member] |  |  |  |
Disclosure Of Income Taxes [line items] |  |  |  |
Current tax expense income | (585) | (4,504) | (40) |
Deferred tax liability asset | (387) | 270 | (310) |
Foreign [member] |  |  |  |
Disclosure Of Income Taxes [line items] |  |  |  |
Current tax expense income | (1,400) | (3,052) | (3,777) |
Deferred tax liability asset | € 37 | € (143) | € 1,241 |
[1] | The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5(c).

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