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Pensions - Additional Information (Details) - Final Salary Defined Benefit Pension Plan
 12 Months Ended
Dec. 31, 2020
EUR (€)
Disclosure Of Defined Benefit Plans [Line Items]  
Description of participants contribute to retirement benefit plan Plan participants may elect to contribute a percentage of their income (between 1.5% and 2.5% of salary components up to the social security contribution ceiling). A €1.00 employee contribution results in an annual pension entitlement of €0.42.
Annual pension entitlement of employee contribution for one Euro € 0.42
Maximum pension fund contributions 34,000
Pension fund contributions expected for the following financial year € 200,000
Funded Base Plan  
Disclosure Of Defined Benefit Plans [Line Items]  
Weighted average duration of defined benefit obligation 35 years 11 months 1 day
Non-funded Supplement Plan  
Disclosure Of Defined Benefit Plans [Line Items]  
Weighted average duration of defined benefit obligation 19 years 9 months 7 days
Minimum  
Disclosure Of Defined Benefit Plans [Line Items]  
Percentage of defined contribution plan of salary 1.50%
Maximum  
Disclosure Of Defined Benefit Plans [Line Items]  
Percentage of defined contribution plan of salary 2.50%