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Shareholders' equity - Characteristics of BSA plans (Details)
12 Months Ended
Dec. 15, 2023
EUR (€)
EquityInstruments
Y
€ / shares
shares
May 25, 2023
EUR (€)
EquityInstruments
Y
€ / shares
shares
Apr. 16, 2021
EUR (€)
Y
EquityInstruments
€ / shares
shares
Mar. 09, 2020
EUR (€)
Y
EquityInstruments
€ / shares
shares
Jun. 28, 2019
EUR (€)
EquityInstruments
Y
€ / shares
shares
Dec. 14, 2018
EUR (€)
Y
EquityInstruments
€ / shares
shares
May 29, 2017
EUR (€)
EquityInstruments
Y
€ / shares
shares
Dec. 31, 2023
EquityInstruments
€ / shares
Dec. 31, 2024
plan
€ / shares
Dec. 31, 2022
€ / shares
BSA plans                    
Disclosure of classes of share capital [line items]                    
Number of plans outstanding | plan                 8  
Number of equity instruments granted | EquityInstruments               30,000    
BSA - 2017 plan                    
Disclosure of classes of share capital [line items]                    
Number of equity instruments granted | EquityInstruments             195,000      
Number of shares per instrument | shares             1      
Subscription premium price per share (€)             € 0.534      
Exercise price (in euros)             € 6.675 € 6.67 € 6.67 € 6.67
Fair value per instrument at grant date | €             € 2.47      
Expected volatility             40.00%      
Average life (years) | Y             6      
Risk-free rate             0.22%      
BSA - 2017 plan | Tranche one                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)             1 year      
BSA - 2017 plan | Tranche two                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)             2 years      
BSA - 2017 plan | Tranche three                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)             3 years      
BSA - 2018 plan                    
Disclosure of classes of share capital [line items]                    
Number of equity instruments granted | EquityInstruments           126,000        
Number of shares per instrument | shares           1        
Subscription premium price per share (€)           € 0.48        
Exercise price (in euros)           € 6.067   6.07 6.07 6.07
Fair value per instrument at grant date | €           € 1.98        
Expected volatility           40.00%        
Average life (years) | Y           6        
Risk-free rate           0.30%        
BSA - 2018 plan | Minimum                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)           1 year        
BSA - 2018 plan | Maximum                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)           3 years        
BSA - 2019 plan                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)         1 year          
Number of equity instruments granted | EquityInstruments         10,000          
Number of shares per instrument | shares         1          
Subscription premium price per share (€)         € 0.18          
Exercise price (in euros)         € 2.2     2.2 2.2 2.2
Fair value per instrument at grant date | €         € 0.48          
Expected volatility         40.00%          
Average life (years) | Y         5.5          
Risk-free rate         0.33%          
BSA 2019 bis                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)       1 year            
Number of equity instruments granted | EquityInstruments       10,000            
Number of shares per instrument | shares       1            
Subscription premium price per share (€)       € 0.29            
Exercise price (in euros)       € 3.68       3.68 3.68 3.68
Fair value per instrument at grant date | €       € 0.9            
Expected volatility       40.00%            
Average life (years) | Y       6            
Risk-free rate       0.00%            
BSA 2019 ter                    
Disclosure of classes of share capital [line items]                    
Number of equity instruments granted | EquityInstruments       36,000            
Number of shares per instrument | shares       1            
Subscription premium price per share (€)       € 0.29            
Exercise price (in euros)       € 3.68       € 3.68 3.68 3.68
Fair value per instrument at grant date | €       € 0.9            
Expected volatility       40.00%            
Average life (years) | Y       6            
Risk-free rate       0.00%            
BSA 2019 ter | Minimum                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)       1 year            
BSA 2019 ter | Maximum                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)       3 years            
BSA 2021                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)     3 years              
Number of equity instruments granted | EquityInstruments     50,000              
Number of shares per instrument | shares     1              
Subscription premium price per share (€)     € 2.45              
Exercise price (in euros)     € 11.74              
Expected volatility     64.00%              
Average life (years) | Y     5              
Risk-free rate     0.60%              
BSA 2021 | Minimum                    
Disclosure of classes of share capital [line items]                    
Fair value per instrument at grant date | €     € 3              
BSA 2021 | Maximum                    
Disclosure of classes of share capital [line items]                    
Fair value per instrument at grant date | €     € 3.2              
BSA 2023-1                    
Disclosure of classes of share capital [line items]                    
Vesting and holding period (year)   2 years 10 months 24 days                
Number of equity instruments granted | EquityInstruments   10,000           10,000    
Number of shares per instrument | shares   1                
Subscription premium price per share (€)   € 0.2                
Exercise price (in euros)   € 2.51           € 2.51 2.51  
Fair value per instrument at grant date | €   € 1.89                
Expected volatility   65.00%                
Average life (years) | Y   6.5                
Risk-free rate   2.96%                
BSA 2023-1 | David Nikodem                    
Disclosure of classes of share capital [line items]                    
Weighted average exercise price of other equity instruments granted in share-based payment arrangement   € 2.51           2.51    
Number of equity instruments granted | EquityInstruments   10,000                
Subscription premium price per share (€)               € 0.2    
BSA 2023-2                    
Disclosure of classes of share capital [line items]                    
Weighted average exercise price of other equity instruments granted in share-based payment arrangement € 3.91                  
Vesting and holding period (year) 2 years 3 months 18 days                  
Number of equity instruments granted | EquityInstruments 20,000             20,000    
Number of shares per instrument | shares 1                  
Subscription premium price per share (€) € 0.31                  
Exercise price (in euros) € 3.91             € 3.91 3.91  
Fair value per instrument at grant date | € € 2.67                  
Expected volatility 62.00%                  
Average life (years) | Y 6.2                  
Risk-free rate 2.65%                  
BSA 2023-2 | David Nikodem                    
Disclosure of classes of share capital [line items]                    
Weighted average exercise price of other equity instruments granted in share-based payment arrangement               3.91    
Number of equity instruments granted | EquityInstruments 20,000                  
Subscription premium price per share (€) € 0.31             0.31    
BSA - Plan 2021-1                    
Disclosure of classes of share capital [line items]                    
Exercise price (in euros)               € 11.74 € 11.74 € 11.74