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Financial Revenue and Expenses - Summary of Financial Income and Expenses (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Detail Information About Financial Income And Expenses [line items]      
Financial revenues € 616 € 1,516 € 1,018
Financial expenses (3,325) (16) (146)
Total € (2,709) 1,500 € 871
Scenario, Previously Reported [Member]      
Disclosure Of Detail Information About Financial Income And Expenses [line items]      
Financial revenues   1,646  
Financial expenses   € (145)