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Shareholders' Equity - Share warrants plans (Details) - Bonus share award plans - € / shares	12 Months Ended
	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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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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