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Related Party Disclosures - Summary of Transactions Between Related Parties Outstanding Balances (Details) - Other Related Parties - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Transactions Between Related Parties [Line Items]    
Outstanding balances € 500 € 51
ATHOS KG    
Disclosure Of Transactions Between Related Parties [Line Items]    
Outstanding balances € 500 € 51