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Financial instruments - Fair value of the convertible senior secured notes (Details) - Convertible Senior Secured Notes - Financial liabilities at fair value through profit and loss category - Level 3
Jun. 30, 2023
Dec. 31, 2022
Risk-free rate    
Financial instruments    
Significant unobservable input liabilities 0.044 0.041
Dividend yield    
Financial instruments    
Significant unobservable input liabilities 0 0
Volatility    
Financial instruments    
Significant unobservable input liabilities 80.0 65.0
Credit spread    
Financial instruments    
Significant unobservable input liabilities 27.50 26.38