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Operating Expenses - Summary of Personnel Expenses (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of personnel expense [Abstract]      
Wages and salaries € 22,451 € 14,651 € 7,243
Social security contributions 7,157 3,903 3,193
Expenses for pension commitments 1,583 982 116
Employer contribution to bonus shares 1,857 6,456 1,198
Share-based payments 30,781 34,353 10,419
Total € 63,830 € 60,345 € 22,168