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Other Payables - Schedule Other Payables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Trade and other current payables [abstract]      
Salaries and wages € 5,085 € 3,864 € 10,989
Social security contributions 6,901 5,826 4,081
Vacation accrual 6,408 6,036 4,350
Withholding taxes on payroll and on others 2,379 2,557 2,747
Other accounts payable 6,141 9,304 7,240
Total € 26,914 € 27,587 € 29,407