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Income Tax Expense - Summary of Total Income Taxes (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income Taxes [line items]    
Current tax expense income € (7,556) € (3,817)
Deferred tax liability asset 127 931
Total (7,429) (2,886) [1]
Domestic [member]    
Disclosure Of Income Taxes [line items]    
Current tax expense income (4,504) (40)
Deferred tax liability asset 270 (310)
Foreign [member]    
Disclosure Of Income Taxes [line items]    
Current tax expense income (3,052) (3,777)
Deferred tax liability asset € (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.