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Shareholders' Equity - Characteristics of BSA share warrant plans (Details) | 12 Months Ended |
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Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2020 EUR (€) item € / shares shares | Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2019 € / shares | Dec. 31, 2018 € / shares | Jan. 01, 2020 item
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Issued |  |  |  | 10,000 |  |
BSA share warrants |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of free share award plans | item |  |  |  |  |  | 3
BSA - 2017 plan |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Issued | item |  | 195,000 |  |  |  |
Number of shares per BSA | shares | 1 | 1 | 1 |  |  |
Subscription premium price per share () | € 0.534 | € 0.534 | € 0.534 |  |  |
Exercise price (in euros) | € 6.675 | € 6.675 | € 6.675 | € 6.67 | € 6.67 |
Fair value per BSA at grant date () | € | € 2.47 | € 2.47 | € 2.47 |  |  |
Expected volatility |  |  | 40.00% |  |  |
Average life (years) |  |  | 6 |  |  |
Risk free rate |  |  | 0.22% |  |  |
BSA - 2017 plan | Tranche one |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |
BSA - 2017 plan | Tranche two |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 2 years |  |  |  |  |
BSA - 2017 plan | Tranche three |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
BSA - 2018 plan |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Issued |  |  |  |  | 126,000 |
Exercise price (in euros) | € 6.070 | € 6.070 | € 6.070 | € 6.07 | € 6.067 |
BSA 2018-1 |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Issued | item |  | 126,000 |  |  |  |
Number of shares per BSA | shares | 1 | 1 | 1 |  |  |
Subscription premium price per share () | € 0.480 | € 0.480 | € 0.480 |  |  |
Exercise price (in euros) | € 6.067 | € 6.067 | € 6.067 |  |  |
Fair value per BSA at grant date () | € | € 1.98 | € 1.98 | € 1.98 |  |  |
Expected volatility |  |  | 40.00% |  |  |
Average life (years) |  |  | 6 |  |  |
Risk free rate |  |  | 0.30% |  |  |
BSA 2018-1 | Maximum |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
BSA 2018-1 | Minimum |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |
BSA 2019 |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |
Issued | item |  | 10,000 |  |  |  |
Number of shares per BSA | shares | 1 | 1 | 1 |  |  |
Subscription premium price per share () | € 0.180 | € 0.180 | € 0.180 |  |  |
Exercise price (in euros) | € 2.200 | € 2.200 | € 2.200 |  |  |
Fair value per BSA at grant date () | € | € 0.48 | € 0.48 | € 0.48 |  |  |
Expected volatility |  |  | 40.00% |  |  |
Average life (years) |  |  | 5.5 |  |  |
Risk free rate |  |  | 0.33% |  |  |
BSA 2019 bis |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |
Issued |  | 10,000 | 10,000 |  |  |
Number of shares per BSA | shares | 1 | 1 | 1 |  |  |
Subscription premium price per share () | € 0.290 | € 0.290 | € 0.290 |  |  |
Exercise price (in euros) | € 3.680 | € 3.680 | € 3.680 |  |  |
Fair value per BSA at grant date () | € | € 0.90 | € 0.90 | € 0.90 |  |  |
Expected volatility |  |  | 40.00% |  |  |
Average life (years) |  |  | 6 |  |  |
Risk free rate |  |  | 0.00% |  |  |
BSA 2019 ter |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Issued |  | 36,000 | 36,000 |  |  |
Number of shares per BSA | shares | 1 | 1 | 1 |  |  |
Subscription premium price per share () | € 0.290 | € 0.290 | € 0.290 |  |  |
Exercise price (in euros) | € 3.680 | € 3.680 | € 3.680 |  |  |
Fair value per BSA at grant date () | € | € 0.90 | € 0.90 | € 0.90 |  |  |
Expected volatility |  |  | 40.00% |  |  |
Average life (years) |  |  | 6 |  |  |
Risk free rate |  |  | 0.00% |  |  |
BSA 2019 ter | Maximum |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
BSA 2019 ter | Minimum |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |

X
- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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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 exercise price of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: 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 Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + 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 Represents the number of free share award plans approved by the reporting entity during the period. + References No definition available. + Details
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- Definition Subscription premium price per share of other equity instruments granted in share-based payment arrangement. + References No definition available. + Details
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