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Shareholders' Equity - Bonus share award plans (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 EUR (€) shares | Dec. 31, 2019 plan | Dec. 31, 2018 | Jan. 01, 2020 plan
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Issued |  | 10,000 |  |
AGA |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of plans outstanding | plan |  | 2 |  | 4
Bonus share award plans |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Issued |  | 283,500 | 341,400 |
AGA 2017-1 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 2 years |  |  |
Issued | 92,300 |  |  |
Holding period (year) | 1 year |  |  |
Number of shares per AGA | shares | 1 |  |  |
Fair value per share at grant date () | € | € 7.04 |  |  |
AGA 2018 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of plans outstanding | plan |  |  |  | 2
AGA 2018-1 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 1 year |  |  |
Issued | 10,000 |  | 10,000 |
Holding period (year) | 1 year |  |  |
Number of shares per AGA | shares | 1 |  |  |
Fair value per share at grant date () | € | € 5.54 |  |  |
AGA 2018-2 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 2 years |  |  |
Issued | 65,700 |  | 65,700 |
Holding period (year) | 1 year |  |  |
Number of shares per AGA | shares | 1 |  |  |
Fair value per share at grant date () | € | € 5.54 |  |  |
AGA 2018-3 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 2 years |  |  |
Issued | 265,700 |  | 265,700 |
Holding period (year) | 1 year |  |  |
Number of shares per AGA | shares | 1 |  |  |
Fair value per share at grant date () | € | € 6.05 |  |  |
AGA 2019 plans |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of plans outstanding | plan |  |  |  | 2
AGA 2019-1 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 2 years |  |  |
Issued | 37,500 | 37,500 |  |
Holding period (year) | 1 year |  |  |
Number of shares per AGA | shares | 1 |  |  |
Fair value per share at grant date () | € | € 1.92 |  |  |
AGA 2019-2 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 1 year |  |  |
Issued | 246,000 | 246,000 |  |
Holding period (year) | 1 year |  |  |
Number of shares per AGA | shares | 1 |  |  |
Fair value per share at grant date () | € | € 1.92 |  |  |

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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. + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Represents the holding period of awards granted in share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period which the right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of award plans outstanding as of the reporting date. + References No definition available. + Details
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- Definition Number of shares that each equity instruments other than share options granted in a share-based payment arrangement, entitles the holder. + References No definition available. + Details
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