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Shareholders' Equity - Share warrants plans (Details) - Bonus share award plans - € / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Directors |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Subscription price |  |  |  | € 0.534
Service Providers |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Subscription price |  |  | € 0.48 |
David Nikodem |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Subscription price | € 0.29 | € 0.18 |  |

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