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Operating Expenses - Summary of Personnel Expenses (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of personnel expense [abstract]    
Wages and salaries € 25,332 € 14,256
Social security contributions 7,138 4,556
Expenses for pension commitments 1,223 1,100
Employer contribution to bonus shares 455 906
Share-based payments 8,040 16,758
Total personnel expenses € 42,188 € 37,577