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Related-Party Transactions - Summary of transactions with key management personnel (Details) - Executive and corporate officers - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]      
Short-term benefits € 1,517 € 1,669 € 1,366
Pension plan expenses 92 77 66
Share-based compensation expense 907 259 280
Post-employment benefits 92 77 66
Share-based payment 907 259 280
Net total € 2,516 € 2,005 € 1,712