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Company Information - Tax audit on payroll tax (Details) - EUR (€)
€ in Millions
 1 Months Ended
Oct. 30, 2020
Jun. 16, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 08, 2020
Other Non Current Assets [Line Items]          
Amount of guarantee       € 1.7  
Payroll Tax Audit, 2016, 2017 and 2018          
Other Non Current Assets [Line Items]          
Proposed payroll tax adjustment     € 1.7    
Payroll Tax Audit, 2018          
Other Non Current Assets [Line Items]          
Concession granted on disputed payroll taxes   € 0.5      
Payroll Tax Audit, 2016 and 2017          
Other Non Current Assets [Line Items]          
Payment of payroll taxes for taxable year € 1.2        
Amount of guarantee         € 1.2