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Shareholders' Equity - Changes in share capital (Details) € / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
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Dec. 14, 2020 EUR (€) € / shares shares | Nov. 30, 2020 EUR (€) € / shares shares | Jul. 15, 2020 USD ($) shares | Jul. 15, 2020 EUR (€) € / shares shares | Jun. 28, 2020 EUR (€) € / shares shares | Apr. 18, 2020 EUR (€) | Apr. 17, 2020 EUR (€) | Feb. 07, 2020 EUR (€) € / shares shares | Jan. 26, 2020 EUR (€) € / shares shares | Oct. 02, 2019 EUR (€) item € / shares shares | Sep. 20, 2019 EUR (€) item € / shares shares | Apr. 18, 2019 EUR (€) € / shares shares | Jan. 26, 2019 EUR (€) € / shares shares | Jan. 23, 2019 EUR (€) € / shares shares | Dec. 31, 2018 EUR (€) € / shares shares | Apr. 18, 2018 EUR (€) € / shares shares | Apr. 17, 2018 EUR (€) € / shares shares | Jan. 26, 2018 EUR (€) € / shares shares | Jul. 31, 2020 USD ($) | Feb. 29, 2020 EUR (€) | Apr. 30, 2018 EUR (€) | Oct. 31, 2019 EUR (€) | Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2019 EUR (€) € / shares shares | Dec. 31, 2018 EUR (€) € / shares shares | Dec. 31, 2017 EUR (€) € / shares shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 61,596,000 |  |  |  |  |  |  |  | € 111,211,000 | € 41,392,000 | € 61,596,000 | € 61,292,000
Number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,630,261 |  |  |
Nominal value per share | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0.01 |  |  |
Issue of ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 109,099,000 | 8,903,000 | 35,497,000 |
Gross Proceeds From Issuing Shares |  |  | $ 107.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 107.7 | € 14,700,000 |  | € 8,900,000 |  |  |  |
Reclassification of debit retained earnings to premium related to share capital |  |  |  |  |  | € 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Enterprise Associates (NEA), as well as BVF Partners L.P., Sofinnova Partners and Novo Holdings A/S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 3,100,000 |
Number of capital increases | item |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 222,573 |  |  |  |  |  |  |  | € 386,302 | € 268,461 | € 222,573 | € 164,445
Number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,257,277 |  |  |  |  |  |  |  | 38,630,261 | 26,846,112 | 22,257,277 | 16,444,477
Nominal value per share | € / shares | € 0.01 | € 0.01 |  | € 0.01 | € 0.01 |  |  | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 |  |  |  |  | € 0.01 | € 0.01 | € 0.01 | € 0.01
Issue of ordinary shares |  | € 100 |  | € 74,783 |  |  |  | € 37,783 |  | € 3,139 | € 41,600 |  |  |  |  |  | € 55,725 |  |  |  |  |  | € 113,000 | € 45,000 | € 56,000 |
Number of shares issued during the period | shares |  | 10,000 | 7,478,261 | 7,478,261 |  |  |  | 3,778,338 |  | 313,936 | 4,159,999 |  |  |  | 22,257,277 |  | 5,572,500 |  |  |  |  |  | 11,256,599,000 | 4,473,935 | 5,572,500 |
Share capital | BSPCE plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  | € 274 |  |  |  | € 1,803 |  |  |  |  |  |  |  |
Number of shares issued during the period | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,400 |  |  |  | 180,300 |  |  |  |  |  |  |  |
Share capital | AGA Bonus Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of ordinary shares | € 2,273 |  |  |  | € 2,270 |  |  |  | € 633 |  |  | € 775 | € 100 |  |  | € 600 |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period | shares | 227,250 |  |  |  | 227,000 |  |  |  | 63,300 |  |  | 77,500 | 10,000 |  |  | 60,000 |  |  |  |  |  |  |  |  |  |
Premiums related to share capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 77,460,125 |  |  |  |  |  |  |  | € 139,667,603 | € 86,011,893 | € 77,460,125 | € 44,991,815
Issue of ordinary shares |  | € 66,650 |  | € 94,024,272 |  |  |  | € 14,962,218 |  | € 621,593 | € 8,236,798 |  |  |  |  |  | € 35,441,100 |  |  |  | € 32,400,000 |  | 108,986,000 | € 8,858,000 | € 35,441,000 |
Transaction costs |  |  |  | € (7,077,866) |  |  |  | € (319,564) |  | € (12,023) | € (312,294) |  |  |  |  |  | € (3,079,174) |  |  |  |  |  |  |  |  |
Appropriation of the issue premium |  |  |  |  |  |  | € (48,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € (48,000,000) |  |  |
Number of existing shareholders | item |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums related to share capital | BSPCE plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  | € 17,693 |  |  |  | € 106,384 |  |  |  |  |  |  |  |

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