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Leases - Summary of Right-of use assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets € 6,149 € 3,287 [1]
Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 5,760 2,799
IT and telecommunication    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 258 349
Vehicles [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 90 90
Other assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets € 41 € 49
[1] See Note 2 for details regarding the change in presentation of Other financial assets