Employee Benefits - Additional Information (Details) - EUR (€) € in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Disclosure of information about defined benefit plans [abstract]
Defined contribution plan expense	€ 485	€ 406
Net defined benefit liability (asset)	714		€ 864	€ 922
Current provisions	193		313
Actuarial gains (losses) on obligation	0		0
Provisions for employee benefits	€ 714		€ 864

The amount of current provisions, including provisions for employee benefits. [Refer: Provisions]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions]

+ References

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