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Supplier Accounts Payable and Other Current Liabilities - Additional Information (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Disclosure Of Supplier Accounts And Other Current Liabilities [abstract]    
Supplier accounts and related payables term 1 year  
Current part of deferred revenue € 5,470 € 4,360