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Financial Revenue and Expenses - Summary of Financial Income and Expenses (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detail information about financial income and expenses [abstract]    
Financial revenues € 491 € 1,813
Financial expenses (966) (360)
Total € (475) € 1,452