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Shareholders' Equity - Bonus share movements (in number of shares issuable upon exercise) (Details) € / shares in Units, € in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 14, 2020 | Jun. 28, 2020 | Jan. 26, 2020 | Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2019 EUR (€) plan € / shares shares | Dec. 31, 2018 EUR (€) € / shares | Jan. 01, 2020 plan
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Outstanding, Beginning balance |  |  |  | 274,800 | 337,200 |  |
Issued |  |  |  |  | 10,000 |  |
Exercised/Vesting |  |  |  |  | (27,400) |  |
Forfeited |  |  |  |  | (45,000) |  |
Outstanding, Ending balance |  |  |  |  | 274,800 | 337,200 |
Number of shares exercisable |  |  |  |  | 167,467 |  |
Share based payment expense | € |  |  |  | € 920 | € 1,180 | € 649 |
AGA |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Exercised/Vesting |  |  |  | (517,550) |  |  |
Number of plans outstanding | plan |  |  |  |  | 2 |  | 4
Bonus share award plans |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Outstanding, Beginning balance |  |  |  | 556,050 | 418,900 | 139,900 |
Issued |  |  |  |  | 283,500 | 341,400 |
Exercised/Vesting |  |  |  | (517,550) | (87,500) | (60,000) |
Forfeited |  |  |  | (9,400) | (58,850) | (2,400) |
Outstanding, Ending balance |  |  |  | 29,100 | 556,050 | 418,900 |
Number of awards forfeited as a result of voluntary departures | shares |  |  |  | 45,600 |  |  |
AGA 2017-1 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  |  | € 7.35 | € 7.35 |
Outstanding, Beginning balance |  |  |  |  | 77,500 | 79,900 |
Issued |  |  |  | 92,300 |  |  |
Exercised/Vesting |  |  |  |  | (77,500) |  |
Forfeited |  |  |  |  |  | (2,400) |
Outstanding, Ending balance |  |  |  |  |  | 77,500 |
AGA 2017-2 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  |  |  | € 7.35 |
Outstanding, Beginning balance |  |  |  |  |  | 60,000 |
Exercised/Vesting |  |  |  |  |  | (60,000) |
AGA 2018-1 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  |  | € 5.76 | € 5.76 |
Outstanding, Beginning balance |  |  |  |  | 10,000 |  |
Issued |  |  |  | 10,000 |  | 10,000 |
Exercised/Vesting |  |  |  |  | (10,000) |  |
Outstanding, Ending balance |  |  |  |  |  | 10,000 |
AGA 2018-2 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  | € 5.76 | € 5.76 | € 5.76 |
Outstanding, Beginning balance |  |  |  | 63,300 | 65,700 |  |
Issued |  |  |  | 65,700 |  | 65,700 |
Exercised/Vesting |  |  | (63,300) | (63,300) |  |  |
Forfeited |  |  |  |  | (2,400) |  |
Outstanding, Ending balance |  |  |  |  | 63,300 | 65,700 |
AGA 2018-3 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  | € 6.28 | € 6.28 | € 6.28 |
Outstanding, Beginning balance |  |  |  | 227,250 | 265,700 |  |
Issued |  |  |  | 265,700 |  | 265,700 |
Exercised/Vesting | (227,250) |  |  | (227,250) |  |  |
Forfeited |  |  |  |  | (38,450) |  |
Outstanding, Ending balance |  |  |  |  | 227,250 | 265,700 |
Number of awards forfeited as part of the redundancy plan | shares |  |  |  |  | 10,850 |  |
Number of awards forfeited refused by an employee | shares |  |  |  |  | 2,400 |  |
Number of awards forfeited as a result of voluntary departures | shares |  |  |  |  | 25,200 |  |
AGA 2019-1 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  | € 2.00 | € 2.00 |  |
Outstanding, Beginning balance |  |  |  | 37,500 |  |  |
Issued |  |  |  | 37,500 | 37,500 |  |
Forfeited |  |  |  | (8,400) |  |  |
Outstanding, Ending balance |  |  |  | 29,100 | 37,500 |  |
AGA 2019-2 |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Stock price at grant date (in euros) |  |  |  | € 2.00 | € 2.00 |  |
Outstanding, Beginning balance |  |  |  | 228,000 |  |  |
Issued |  |  |  | 246,000 | 246,000 |  |
Exercised/Vesting |  | (227,000) |  | (227,000) |  |  |
Forfeited |  |  |  | (1,000) | (18,000) |  |
Outstanding, Ending balance |  |  |  |  | 228,000 |  |

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