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Operating expenses - Payroll Costs, Additional Information (Details) € in Thousands	12 Months Ended
	Dec. 31, 2021 EUR (€) employee	Dec. 31, 2020 EUR (€) employee	Dec. 31, 2019 EUR (€) employee
Analysis of income and expense [abstract]
End-of-period headcount | employee	100	90	110
Increase in number of employees | employee	10
Short-term employee benefits expense | €	€ 15,700	€ 15,100	€ 16,800
Share-based payments | €	€ 3,201	€ 2,924	€ 4,320

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- References

No definition available.

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The number of personnel employed by the entity at a date.

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- Definition

The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Increase (Decrease) In Number Of Employees

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No definition available.

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