Provisions - Additional Information (Detail) € in Thousands  | 
12 Months Ended | |||
|---|---|---|---|---|
| 
 Dec. 31, 2021  
EUR (€) 
 | 
 Dec. 31, 2020  
EUR (€) 
 | 
 Dec. 31, 2019  
EUR (€) 
 | 
Feb. 29, 2020  | 
|
| Statements [Line Items] | ||||
| Provisions For Employee Benefits | € 73 | € 78 | € 363 | |
| Legal fees | 640 | |||
| Other provisions | 381 | 571 | ||
| General and administrative Expenses [Member] | ||||
| Statements [Line Items] | ||||
| Provisions For Employee Benefits | 2,674 | |||
| Legal fees | 208,945 | 9,134 | 4,451 | |
| Selling and distribution Expenses [Member] | ||||
| Statements [Line Items] | ||||
| Provisions For Employee Benefits | 360 | |||
| Legal fees | 15 | |||
| Restructuring provision [member] | ||||
| Statements [Line Items] | ||||
| Other provisions | € 248 | 423 | € 0 | |
| Top of range [member] | ||||
| Statements [Line Items] | ||||
| Provisions For Employee Benefits | 3,804 | |||
| Legal fees | € 115 | |||
| Internal and external staff members [Member] | ||||
| Statements [Line Items] | ||||
| Number of employees | 167 | |||
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- References No definition available. 
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- Definition The number of personnel employed by the entity at a date. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- 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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- Definition The amount of fees paid or payable for professional services. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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