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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
Apr. 16, 2021
€ / shares
Mar. 09, 2020
EquityInstruments
item
€ / shares
Dec. 31, 2022
EUR (€)
€ / shares
shares
Dec. 31, 2021
EUR (€)
€ / shares
shares
Dec. 31, 2020
EUR (€)
€ / shares
shares
BSA 2019 bis          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Exercise price (in euros)   € 3.68 € 3.68 € 3.68 € 3.68
Outstanding, Beginning balance     10,000 10,000  
Issued   10,000     10,000
Outstanding, Ending balance     10,000 10,000 10,000
Number of shares exercisable     10,000 10,000  
Number of bonus shares granted | EquityInstruments   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 ter          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Exercise price (in euros)   € 3.68 € 3.68 € 3.68 € 3.68
Outstanding, Beginning balance     36,000 36,000  
Issued   36,000     36,000
Outstanding, Ending balance     36,000 36,000 36,000
Number of shares exercisable     24,000 12,000  
Number of bonus shares granted | EquityInstruments   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
BSPCE and BSA share warrants          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Outstanding, Beginning balance     930,800 310,800 274,800
Issued       650,000 46,000
Exercised/Vesting         (10,000)
Forfeited     (124,000) (30,000)  
Outstanding, Ending balance     806,800 930,800 310,800
Number of shares exercisable     298,800 286,800 226,134
Share based payment expense | €     € 765 € 859 € 18
BSPCE plans          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Outstanding, Beginning balance     608,800 8,800 8,800
Issued       600,000  
Forfeited     (120,000)    
Outstanding, Ending balance     488,800 608,800 8,800
Number of shares exercisable     8,800 8,800 8,800
Number of share warrants outstanding | shares     480,088 600,088 88
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 8,800
Outstanding, Ending balance     8,800 8,800 8,800
Number of shares exercisable     8,800 8,800 8,800
BSPCE 2021 [Member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Exercise price (in euros) € 11.74   € 11.74 € 11.74  
Outstanding, Beginning balance     600,000    
Issued 600,000     600,000  
Forfeited     (120,000)    
Outstanding, Ending balance     480,000 600,000  
BSPCE 2021 [Member] | 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     322,000 302,000 266,000
Issued       50,000 46,000
Exercised/Vesting         (10,000)
Forfeited     (4,000) (30,000)  
Outstanding, Ending balance     318,000 322,000 302,000
Number of shares exercisable     290,000 278,000 217,334
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     130,000 130,000 140,000
Exercised/Vesting         (10,000)
Outstanding, Ending balance     130,000 130,000 130,000
Number of shares exercisable     130,000 130,000 130,000
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     116,000 116,000 116,000
Outstanding, Ending balance     116,000 116,000 116,000
Number of shares exercisable     116,000 116,000 77,334
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 10,000
Issued | EquityInstruments   46,000      
Outstanding, Ending balance     10,000 10,000 10,000
Number of shares exercisable     10,000 10,000 10,000
BSA - Plan 2021-1          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Exercise price (in euros)     € 11.74 € 11.74  
Outstanding, Beginning balance     20,000    
Issued       50,000  
Forfeited     (4,000) (30,000)  
Outstanding, Ending balance     16,000 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