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Financial liabilities - Financial liabilities - Disclosure of the main data and assumptions, OCEANE convertible loan notes (Details) (Details) - Oceane
€ in Thousands
Aug. 24, 2023
EUR (€)
€ / shares
Dec. 31, 2022
EUR (€)
€ / shares
Jul. 30, 2021
€ / shares
Disclosure of financial liabilities [line items]      
Fair value of convertible notes | € € 1,762 € 142  
Risk-free rate | Monte Carlo model      
Disclosure of financial liabilities [line items]      
Significant unobservable input, liabilities 0.0322 0.0305  
Credit spread | Monte Carlo model      
Disclosure of financial liabilities [line items]      
Significant unobservable input, liabilities 0.1398 0.1475 0.1400
Ordinary share price (in euro per share) | Monte Carlo model      
Disclosure of financial liabilities [line items]      
Significant unobservable input, liabilities | € / shares 16.74 6.18 31.50
Volatility | Monte Carlo model      
Disclosure of financial liabilities [line items]      
Significant unobservable input, liabilities 0.37 0.4401 0.53
Dividend | Monte Carlo model      
Disclosure of financial liabilities [line items]      
Significant unobservable input, liabilities 0 0