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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
12 Months Ended
Mar. 09, 2020
item
May 27, 2019
item
Jan. 23, 2019
shares
Dec. 31, 2021
EUR (€)
item
€ / shares
shares
Dec. 31, 2020
EUR (€)
item
€ / shares
Dec. 31, 2019
EUR (€)
€ / shares
BSA 2019 bis            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 3.68 € 3.68  
Outstanding, Beginning balance       10,000    
Issued       10,000 10,000  
Outstanding, Ending balance       10,000 10,000  
Number of shares exercisable       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 | item 10,000          
BSA 2019 ter            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 3.68 € 3.68  
Outstanding, Beginning balance       36,000    
Issued       36,000 36,000  
Outstanding, Ending balance       36,000 36,000  
Number of shares exercisable       12,000    
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       310,800 274,800 337,200
Issued       650,000 46,000 10,000
Exercised/Vesting         (10,000) (27,400)
Forfeited       (30,000)   (45,000)
Outstanding, Ending balance       930,800 310,800 274,800
Number of shares exercisable       286,800 226,134 167,467
Share based payment expense | €       € 859 € 18 € 227
BSPCE plans            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Outstanding, Beginning balance       8,800 8,800 36,200
Issued       600,000    
Exercised/Vesting           (27,400)
Outstanding, Ending balance       608,800 8,800 8,800
Number of shares exercisable       8,800 8,800 8,800
Number of warrants exercised | shares     274      
Number of new shares issued upon exercise of warrants | shares     27,400      
Number of share warrants outstanding | shares       600,088    
BSPCE - 2015 Plan [Member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)           € 0.67
Outstanding, Beginning balance           22,800
Exercised/Vesting           (22,800)
BSPCE - 2013 Plan [Member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 0.59 € 0.59 € 0.59
Outstanding, Beginning balance       8,800 8,800 13,400
Exercised/Vesting           (4,600)
Outstanding, Ending balance       8,800 8,800 8,800
Number of shares exercisable       8,800 8,800 8,800
BSPCE 2021            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 11.74    
Issued       600,000    
Outstanding, Ending balance       600,000    
BSPCE 2021 | Frederic Cren and Pierre Broqua            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of bonus shares granted       600,000    
BSA plans            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Outstanding, Beginning balance       302,000 266,000 301,000
Issued       50,000 46,000 10,000
Exercised/Vesting         (10,000)  
Forfeited       (30,000)   (45,000)
Outstanding, Ending balance       322,000 302,000 266,000
Number of shares exercisable       278,000 217,334 158,667
BSA - 2017 plan            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 6.67 € 6.67 € 6.67
Outstanding, Beginning balance       130,000 140,000 175,000
Exercised/Vesting         (10,000)  
Forfeited         (35,000) (35,000)
Outstanding, Ending balance       130,000 130,000 140,000
Number of shares exercisable       130,000 130,000 120,000
Number of corporate officers who cancelled their share warrants | item   2        
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)       € 6.07 € 6.07 € 6.07
Outstanding, Beginning balance       116,000 116,000 126,000
Forfeited           (10,000)
Outstanding, Ending balance       116,000 116,000 116,000
Number of shares exercisable       116,000 77,334 38,667
BSA - 2018 plan | JPG Healthcare LLC            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercised/Vesting | item         (10,000)  
BSA - 2019 plan            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 2.20 € 2.20 € 2.20
Outstanding, Beginning balance       10,000 10,000  
Issued 46,000         10,000
Outstanding, Ending balance       10,000 10,000 10,000
Number of shares exercisable       10,000 10,000  
BSA - 2019 plan | David Nikodem            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Issued | item         10,000  
BSA - Plan 2021-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Exercise price (in euros)       € 11.74    
Issued       50,000    
Forfeited       (30,000)    
Outstanding, Ending balance       20,000    
BSA - Plan 2021-1 | ISLS Consulting            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Forfeited       (30,000)    
BSA - Plan 2021-1 | ISLS Consulting and David Nikadem            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of bonus shares granted       50,000