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Share-based payments - Schedule of Changes in Founder's Warrant (Details)
Jun. 30, 2025
shares
Jan. 07, 2017
shares
benefeciary
Feb. 02, 2016
shares
benefeciary
Jun. 10, 2015
shares
benefeciary
Feb. 10, 2015
shares
benefeciary
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards outstanding (in shares) 5,158,881        
BSPCE 2015-1          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards authorised (in shares)         450,000
Total number of awards granted (in shares)         71,650
Total number of shares to which the awards were likely to give right (in shares)         71,650
Number of shares subscribed (in shares) 0        
Total number of awards lapsed, cancelled or forfeited (in shares) 71,650        
Total number of awards outstanding (in shares) 0        
Total number of shares available for subscription (in shares) 0        
Maximum total number of shares that may be subscribed (in shares) 0        
BSPCE 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)         24,000
BSPCE 2015-1 | Laurent LEVY          
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)         24,000
BSPCE 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         13
BSPCE 2015-3          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards authorised (in shares)       450,000  
Total number of awards granted (in shares)       53,050  
Total number of shares to which the awards were likely to give right (in shares)       53,050  
Number of shares subscribed (in shares) 0        
Total number of awards lapsed, cancelled or forfeited (in shares) 53,050        
Total number of awards outstanding (in shares) 0        
Total number of shares available for subscription (in shares) 0        
Maximum total number of shares that may be subscribed (in shares) 0        
BSPCE 2015-3 | Beneficiaries other than corporate officers          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Number of beneficiaries who are not corporate officers | benefeciary       42  
BSPCE 2016 O          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards authorised (in shares)     450,000    
Total number of awards granted (in shares)     126,400    
Total number of shares to which the awards were likely to give right (in shares)     126,400    
Number of shares subscribed (in shares) 333        
Total number of awards lapsed, cancelled or forfeited (in shares) 29,250        
Total number of awards outstanding (in shares) 96,817        
Total number of shares available for subscription (in shares) 96,817        
Maximum total number of shares that may be subscribed (in shares) 96,817        
BSPCE 2016 O | 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)     23,500    
BSPCE 2016 O | Laurent LEVY          
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)     23,500    
BSPCE 2016 O | Beneficiaries other than corporate officers          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Number of beneficiaries who are not corporate officers | benefeciary     43    
BSPCE 2016 P          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards authorised (in shares)     450,000    
Total number of awards granted (in shares)     129,250    
Total number of shares to which the awards were likely to give right (in shares)     129,250    
Number of shares subscribed (in shares) 0        
Total number of awards lapsed, cancelled or forfeited (in shares) 31,150        
Total number of awards outstanding (in shares) 98,100        
Total number of shares available for subscription (in shares) 98,100        
Maximum total number of shares that may be subscribed (in shares) 98,100        
BSPCE 2016 P | 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)     23,500    
BSPCE 2016 P | Laurent LEVY          
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)     23,500    
BSPCE 2016 P | Beneficiaries other than corporate officers          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Number of beneficiaries who are not corporate officers | benefeciary     50    
BSPCE 2017 O          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards authorised (in shares)   450,000      
Total number of awards granted (in shares)   117,650      
Total number of shares to which the awards were likely to give right (in shares)   117,650      
Number of shares subscribed (in shares) 0        
Total number of awards lapsed, cancelled or forfeited (in shares) 20,600        
Total number of awards outstanding (in shares) 97,050        
Total number of shares available for subscription (in shares) 97,050        
Maximum total number of shares that may be subscribed (in shares) 97,050        
BSPCE 2017 O | 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)   26,400      
BSPCE 2017 O | Laurent LEVY          
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)   26,400      
BSPCE 2017 O | Beneficiaries other than corporate officers          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Number of beneficiaries who are not corporate officers | benefeciary   42      
BSCPE 2017          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Total number of awards authorised (in shares)   450,000      
Total number of awards granted (in shares)   80,000      
Total number of shares to which the awards were likely to give right (in shares)   80,000      
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) 80,000        
Total number of shares available for subscription (in shares) 80,000        
Maximum total number of shares that may be subscribed (in shares) 80,000        
BSCPE 2017 | 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)   32,000      
BSCPE 2017 | Laurent LEVY          
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)   32,000      
BSCPE 2017 | Beneficiaries other than corporate officers          
Disclosure Of Detailed Information About Share-based Payments [Line Items]          
Number of beneficiaries who are not corporate officers | benefeciary   3