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Income Tax Expense - Summary of Total Income Taxes (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Income Taxes [line items]      
Current tax expense income € (3,766) € (1,985) € (7,556)
Deferred tax liability asset (575) (350) 127
Total (4,341) (2,335) (7,429)
Domestic [member]      
Disclosure Of Income Taxes [line items]      
Current tax expense income (2,221) (585) (4,504)
Deferred tax liability asset 430 (387) 270
Foreign [member]      
Disclosure Of Income Taxes [line items]      
Current tax expense income (1,545) (1,400) (3,052)
Deferred tax liability asset € (1,005) € 37 € (143)