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Financial income and expenses - Summary of finance income and costs (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Detailed Information About Finance Income Expense [Abstract]      
Interest income from short-term deposits € 850 € 790 € 507
Foreign currency gains     1,708
Gain on other financial instruments 2,099    
Financial income 2,949 790 2,215
Interest expenses form leases (289) (170) (16)
Foreign currency losses (9,774) (94) (145)
Financial expenses € (10,063) € (264) € (161)