Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Related Party Disclosures - Summary of Loan From/To Related Parties (Details)

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Related Party Disclosures - Summary of Loan From/To Related Parties (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Swissfillon AG      
Disclosure Of Transactions Between Related Parties [Line Items]      
Interest received € 10 € 20 € 17
Financial assets   1,342  
SE Holdings Co.Ltd.      
Disclosure Of Transactions Between Related Parties [Line Items]      
Interest paid 5 6 5
Financial liabilities (940) (968)  
Directors and Key Managers      
Disclosure Of Transactions Between Related Parties [Line Items]      
Interest received 22 53 € 53
Financial assets € 447 € 4,614