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Supplier Accounts Payable and Other Current Liabilities - Schedule of Other Current Liabilities (Details) (Detail) - EUR (€)
€ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Disclosure Of Supplier Accounts And Other Current Liabilities [abstract]    
Social security € 13,238 € 6,343
Tax liabilities 203 448
Other debts 253 1,354
Deferred revenues 5,470 4,360
Total € 19,164 € 12,506