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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
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