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Leases - Additional Information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Additions to right-of-use assets € 5,100 € 300
Currency translation of  right-of-use assets  300 50
Cash payments for leases 2,400 2,100
Payments for leases 2,096 € 1,862 [1]
Until 2025 [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Payments for leases 6,900  
Later than one year [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Payments for leases € 2,100  
[1] See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets