Provisions - Summary of Restructuring Provision (Detail) - EUR (€) € in Thousands  | 
12 Months Ended | |
|---|---|---|
Dec. 31, 2021  | 
Dec. 31, 2020  | 
|
| Disclosure Of Additional Provisions Other Provisions [Line Items] | ||
| Current portion Beginning Balance | € 364 | |
| Non-current portion Beginning Balance | 207 | |
| Beginning Balance | 571 | |
| Current portion Ending Balance | 248 | € 364 | 
| Non-current portion Ending Balance | 133 | 207 | 
| Ending balance | 381 | 571 | 
| Restructuring provision [member] | ||
| Disclosure Of Additional Provisions Other Provisions [Line Items] | ||
| Current portion Beginning Balance | 364 | 0 | 
| Non-current portion Beginning Balance | 59 | 0 | 
| Beginning Balance | 423 | 0 | 
| Additions | 53 | 3,804 | 
| Releases | 0 | |
| Used during the year | (228) | (3,381) | 
| Interest accretion | 0 | |
| Current portion Ending Balance | 248 | 364 | 
| Non-current portion Ending Balance | 0 | 59 | 
| Ending balance | € 248 | € 423 | 
| X | ||||||||||
- Definition Disclosure Of Additional Provisions Other Provisions. No definition available. 
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| X | ||||||||||
- Definition Interest accretion Other Provision No definition available. 
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| X | ||||||||||
- Definition Used other provisions. No definition available. 
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| X | ||||||||||
- Definition The amount of additional other provisions made. [Refer: Other provisions] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Definition The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Definition The amount of current provisions other than provisions for employee benefits. [Refer: Provisions] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Details 
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