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Share-based payments - Schedule of Warrants Outstanding (Details)
Jun. 30, 2025
shares
Apr. 20, 2021
shares
benefeciary
€ / shares
Mar. 17, 2020
shares
benefeciary
€ / shares
Mar. 29, 2019
shares
benefeciary
€ / shares
Jul. 27, 2018
shares
benefeciary
€ / shares
Jun. 25, 2015
shares
benefeciary
€ / shares
Feb. 10, 2015
shares
benefeciary
€ / shares
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards outstanding (in shares) 5,158,881            
BSA 2015-1              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards authorised (in shares)             100,000
Total number of awards granted (in shares)             26,000
Total number of shares to which the awards were likely to give right (in shares)             26,000
BSA issue price (in euro per share) | € / shares             € 4.87
Exercise price (in euros per share) | € / shares             € 17.67
Number of shares subscribed (in shares) 0            
Total number of awards lapsed, cancelled or forfeited (in shares) 26,000            
Total number of awards outstanding (in shares) 0            
Total number of awards available for subscription (in shares) 0            
Maximum total number of awards that may be subscribed (in shares) 0            
BSA 2015-1 | Corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)             15,000
BSA 2015-1 | Corporate officers | Anne-Marie GRAFFIN              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)             5,000
BSA 2015-1 | Corporate officers | Enno SPILLNER              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)             3,000
BSA 2015-1 | Corporate officers | Alain HERRERA              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)             5,000
BSA 2015-1 | Beneficiaries other than corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Number of beneficiaries who are not corporate officers | benefeciary             2
BSA 2015-2              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards authorised (in shares)           100,000  
Total number of awards granted (in shares)           64,000  
Total number of shares to which the awards were likely to give right (in shares)           64,000  
BSA issue price (in euro per share) | € / shares           € 5.00  
Exercise price (in euros per share) | € / shares           € 19.54  
Number of shares subscribed (in shares) 0            
Total number of awards lapsed, cancelled or forfeited (in shares) 64,000            
Total number of awards outstanding (in shares) 0            
Total number of awards available for subscription (in shares) 0            
Maximum total number of awards that may be subscribed (in shares) 0            
BSA 2015-2 | Beneficiaries other than corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Number of beneficiaries who are not corporate officers | benefeciary           1  
BSA 2018-2              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards authorised (in shares)         140,000    
Total number of awards granted (in shares)         5,820    
Total number of shares to which the awards were likely to give right (in shares)         5,820    
BSA issue price (in euro per share) | € / shares         € 2.36    
Exercise price (in euros per share) | € / shares         € 16.10    
Number of shares subscribed (in shares) 0            
Total number of awards lapsed, cancelled or forfeited (in shares) 0            
Total number of awards outstanding (in shares) 5,820            
Total number of awards available for subscription (in shares) 0            
Maximum total number of awards that may be subscribed (in shares) 5,820            
BSA 2018-2 | Beneficiaries other than corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Number of beneficiaries who are not corporate officers | benefeciary         1    
BSA 2019-1              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards authorised (in shares)       140,000      
Total number of awards granted (in shares)       18,000      
Total number of shares to which the awards were likely to give right (in shares)       18,000      
BSA issue price (in euro per share) | € / shares       € 1.15      
Exercise price (in euros per share) | € / shares       € 11.66      
Number of shares subscribed (in shares) 0            
Total number of awards lapsed, cancelled or forfeited (in shares) 0            
Total number of awards outstanding (in shares) 18,000            
Total number of awards available for subscription (in shares) 0            
Maximum total number of awards that may be subscribed (in shares) 18,000            
BSA 2019-1 | Corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)       12,700      
BSA 2019-1 | Corporate officers | Anne-Marie GRAFFIN              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)       2,900      
BSA 2019-1 | Corporate officers | Enno SPILLNER              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)       4,000      
BSA 2019-1 | Corporate officers | Alain HERRERA              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)       2,900      
BSA 2019-1 | Beneficiaries other than corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Number of beneficiaries who are not corporate officers | benefeciary       1      
BSA 2020              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards authorised (in shares)     500,000        
Total number of awards granted (in shares)     18,000        
Total number of shares to which the awards were likely to give right (in shares)     18,000        
BSA issue price (in euro per share) | € / shares     € 0.29        
Exercise price (in euros per share) | € / shares     € 6.59        
Number of shares subscribed (in shares) 0            
Total number of awards lapsed, cancelled or forfeited (in shares) 0            
Total number of awards outstanding (in shares) 18,000            
Total number of awards available for subscription (in shares) 0            
Maximum total number of awards that may be subscribed (in shares) 18,000            
BSA 2020 | Corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)     14,024        
BSA 2020 | Corporate officers | Anne-Marie GRAFFIN              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)     3,843        
BSA 2020 | Corporate officers | Enno SPILLNER              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)     3,829        
BSA 2020 | Corporate officers | Alain HERRERA              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of shares to which the awards were likely to give right (in shares)     3,195        
BSA 2020 | Beneficiaries other than corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Number of beneficiaries who are not corporate officers | benefeciary     1        
BSA 2021              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Total number of awards authorised (in shares)   650,000          
Total number of awards granted (in shares)   48,103          
Total number of shares to which the awards were likely to give right (in shares)   48,103          
BSA issue price (in euro per share) | € / shares   € 2.95          
Exercise price (in euros per share) | € / shares   € 13.47          
Number of shares subscribed (in shares) 0            
Total number of awards lapsed, cancelled or forfeited (in shares) 33,672            
Total number of awards outstanding (in shares) 14,431            
Total number of awards available for subscription (in shares) 0            
Maximum total number of awards that may be subscribed (in shares) 14,431            
BSA 2021 | Beneficiaries other than corporate officers              
Disclosure Of Detailed Information About Share-based Payments [Line Items]              
Number of beneficiaries who are not corporate officers | benefeciary   1