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Supplier Accounts Receivable and Other Current Liabilities - Schedule of Other Current Liabilities (Details) (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Supplier Accounts And Other Current Liabilities [Abstract]      
Social security € 12,094 € 10,794 € 4,464
Tax liabilities 428 504 388
Other debts 440 146 195
Deferred revenues 2,789 3,248 791
Total € 15,751 € 14,692 € 5,838