Inventories - Additional Information (Details) - Cost of sales [member] - EUR (€) € in Thousands  | 
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021  | 
Dec. 31, 2020  | 
Dec. 31, 2019  | 
|
| Statements [Line Items] | |||
| Cost of inventories recognised as expense during period | € 21,243 | € 9,368 | € 3,177 | 
| Inventory write-down | € 651 | € 870 | € 1,311 | 
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition The amount of inventories recognised as an expense during the period. [Refer: Inventories] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Details 
  |