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Inventories (Details) - EUR (€) € in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Schedule of Inventory Disclosure [Line Items] |  |  |
Inventories | € 320 | € 387 | € 410
Gross |  |  |
Schedule of Inventory Disclosure [Line Items] |  |  |
Inventories | 353 | 420 | 443
Inventories write-down |  |  |
Schedule of Inventory Disclosure [Line Items] |  |  |
Inventories | € (33) | € (33) | € (33)

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