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Related Party Disclosures - Summary of Aggregate Value of Transactions Related to Key Management Personnel (Details) - Key Management Personnel of Entity or Parent - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Transactions Between Related Parties [Line Items]      
Consulting services / patent assignment € 25 € 56 € 25
Purchases of various goods and services from TRON 10,105 9,968 11,160
Total € 10,130 € 10,024 € 11,185