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Shareholders' Equity - Movements in BSPCE and BSA share warrants (in number of shares issuable upon exercise) (Details) € / shares in Units, € in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
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Mar. 09, 2020 item | May 27, 2019 item | Jan. 23, 2019 shares | Jan. 20, 2018 item shares | Dec. 31, 2020 item € / shares shares | Dec. 31, 2020 € / shares shares | Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2019 item € / shares shares | Dec. 31, 2019 € / shares shares | Dec. 31, 2019 EUR (€) € / shares shares | Dec. 31, 2018 EUR (€) item € / shares shares
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 | 167,467 | 167,467 |
Share based payment expense | € |  |  |  |  |  |  | € 920 |  |  | € 1,180 | € 649
BSA 2019 bis |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  | € 3.680 | € 3.680 | € 3.680 |  |  |  |
Issued |  |  |  |  | 10,000 | 10,000 |  |  |  |  |
Outstanding, Ending balance |  |  |  |  |  | 10,000 |  |  |  |  |
BSA 2019 bis | JPG Healthcare LLC |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Number of bonus shares granted |  |  |  |  |  | 10,000 |  |  |  |  |
BSA 2019 bis | Jeremy Goldberg |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Number of bonus shares granted | 10,000 |  |  |  |  |  |  |  |  |  |
BSA 2019 ter |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  | € 3.680 | € 3.680 | € 3.680 |  |  |  |
Issued |  |  |  |  | 36,000 | 36,000 |  |  |  |  |
Outstanding, Ending balance |  |  |  |  |  | 36,000 |  |  |  |  |
BSA 2019 ter | David Nikodem |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Number of bonus shares granted | 36,000 |  |  |  |  | 36,000 |  |  |  |  |
BSPCE and BSA share warrants |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Outstanding, Beginning balance |  |  |  |  |  | 274,800 |  |  | 337,200 |  | 411,500
Issued |  |  |  |  |  | 46,000 |  |  |  |  | 126,000
Exercised/Vesting |  |  |  |  |  | (10,000) |  |  |  |  | (180,300)
Forfeited |  |  |  |  |  |  |  |  |  |  | (20,000)
Outstanding, Ending balance |  |  |  |  |  | 310,800 |  |  | 274,800 |  | 337,200
Number of shares exercisable |  |  |  |  | 226,134 | 226,134 | 226,134 |  |  |  | 101,200
Share based payment expense | € |  |  |  |  |  |  | € 18 |  |  | € 227 | € 184
BSPCE plans |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Outstanding, Beginning balance |  |  |  |  |  | 8,800 |  |  | 36,200 |  | 216,500
Issued |  |  |  | 180,300 |  |  |  |  |  |  |
Exercised/Vesting |  |  |  |  |  |  |  |  | (27,400) |  | 180,300
Outstanding, Ending balance |  |  |  |  |  | 8,800 |  |  | 8,800 |  | 36,200
Number of shares exercisable |  |  |  |  | 8,800 | 8,800 | 8,800 | 8,800 | 8,800 | 8,800 | 36,200
Number of warrants exercised | shares |  |  | 274 | 1,803 |  |  |  |  |  |  |
Number of new shares issued upon exercise of warrants | shares |  |  | 27,400 |  |  |  |  |  |  |  |
Number of share warrants outstanding | shares |  |  |  |  | 88 | 88 | 88 | 88 | 88 | 88 | 362
BSPCE - 2015 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  |  |  |  | € 0.67 | € 0.67 | € 0.67 | € 0.67
Outstanding, Beginning balance |  |  |  |  |  |  |  |  | 22,800 |  | 54,700
Exercised/Vesting |  |  |  |  |  |  |  |  | (22,800) |  | (31,900)
Outstanding, Ending balance |  |  |  |  |  |  |  |  |  |  | 22,800
Number of shares exercisable |  |  |  |  |  |  |  |  |  |  | 22,800
BSPCE - 2013 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  | € 0.59 | € 0.59 | € 0.59 | € 0.59 | € 0.59 | € 0.59 | € 0.59
Outstanding, Beginning balance |  |  |  |  |  | 8,800 |  |  | 13,400 |  | 161,800
Exercised/Vesting |  |  |  |  |  |  |  |  | (4,600) |  | (148,400)
Outstanding, Ending balance |  |  |  |  |  | 8,800 |  |  | 8,800 |  | 13,400
Number of shares exercisable |  |  |  |  | 8,800 | 8,800 | 8,800 | 8,800 | 8,800 | 8,800 | 13,400
BSA plans |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Outstanding, Beginning balance |  |  |  |  |  | 266,000 |  |  | 301,000 |  | 195,000
Issued |  |  |  |  |  | 46,000 |  |  | 10,000 |  | 126,000
Exercised/Vesting |  |  |  |  |  | (10,000) |  |  |  |  |
Forfeited |  |  |  |  |  |  |  |  | (45,000) |  | (20,000)
Outstanding, Ending balance |  |  |  |  |  | 302,000 |  |  | 266,000 |  | 301,000
Number of shares exercisable |  |  |  |  | 217,334 | 217,334 | 217,334 | 158,667 | 158,667 | 158,667 | 65,000
Number of share warrants outstanding | shares |  |  |  |  | 302,000 | 302,000 | 302,000 | 266,000 | 266,000 | 266,000 |
BSA - 2017 plan |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  | € 6.675 | € 6.675 | € 6.675 | € 6.67 | € 6.67 | € 6.67 | € 6.67
Outstanding, Beginning balance |  |  |  |  |  | 140,000 |  |  | 175,000 |  | 195,000
Issued |  |  |  |  | 195,000 |  |  |  |  |  |
Exercised/Vesting |  |  |  |  |  | (10,000) |  |  |  |  |
Forfeited |  |  |  |  |  |  |  | 35,000 | (35,000) |  | (20,000)
Outstanding, Ending balance |  |  |  |  |  | 130,000 |  |  | 140,000 |  | 175,000
Number of shares exercisable |  |  |  |  | 130,000 | 130,000 | 130,000 | 120,000 | 120,000 | 120,000 | 65,000
Number of corporate officers who cancelled their share warrants |  | 2 |  |  |  |  |  |  |  |  | 1
BSA - 2017 plan | Karen Aach (former administrator) |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercised/Vesting |  |  |  |  |  | (10,000) |  |  |  |  |
BSA - 2018 plan |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  | € 6.070 | € 6.070 | € 6.070 | € 6.07 | € 6.07 | € 6.07 | € 6.067
Outstanding, Beginning balance |  |  |  |  |  | 116,000 |  |  | 126,000 |  |
Issued |  |  |  |  |  |  |  |  |  |  | 126,000
Forfeited |  |  |  |  |  |  |  |  | (10,000) |  |
Outstanding, Ending balance |  |  |  |  |  | 116,000 |  |  | 116,000 |  | 126,000
Number of shares exercisable |  |  |  |  | 77,334 | 77,334 | 77,334 | 38,667 | 38,667 | 38,667 |
Number of Company's external advisers to whom share warrants were allocated |  |  |  |  |  |  |  | 3 |  |  |
BSA - 2018 plan | JPG Healthcare LLC |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Forfeited |  |  |  |  |  |  |  | 10,000 |  |  |
BSA - 2018 plan | External Advisors [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Issued |  |  |  |  |  |  |  |  |  |  | 126,000
BSA - 2019 plan |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in euros) | € / shares |  |  |  |  | € 2.20 | € 2.20 | € 2.20 | € 2.20 | € 2.20 | € 2.20 |
Outstanding, Beginning balance |  |  |  |  |  | 10,000 |  |  |  |  |
Issued | 46,000 |  |  |  |  |  |  |  | 10,000 |  |
Outstanding, Ending balance |  |  |  |  |  | 10,000 |  |  | 10,000 |  |
Number of shares exercisable |  |  |  |  | 10,000 | 10,000 | 10,000 |  |  |  |
BSA - 2019 plan | David Nikodem |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |
Issued |  |  |  |  |  |  |  | 10,000 |  |  |

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