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Employee Benefits - Additional Information (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Information About Defined Benefit Plans [Abstract]      
Defined contribution plan expense € 923 € 927 € 765
Pension provisions 1,148 1,408 1,085 [1]
Past service costs / amendment or settlement of plan 255    
Actuarial losses / (gains) on obligation 196 € (168) € (31)
Settlement of employee's rights € 450    
[1] The Group applied IFRS 16 “Leases” from January 1, 2019 using the modified retrospective method, and therefore, the comparative information for 2018 has not been restated. The impact of this application is presented in note 4.7 Application of the new IFRS 16 standard.