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Financial instruments - Fair value of the convertible senior secured notes (Details) - Financial liabilities at fair value through profit or loss - Convertible Senior Secured Notes - Level 3
Jun. 30, 2022
Dec. 31, 2021
Risk-free rate    
Disclosure of financial assets [line items]    
Significant unobservable input liabilities 0.0300 0.0125
Dividend yield    
Disclosure of financial assets [line items]    
Significant unobservable input liabilities 0 0
Volatility    
Disclosure of financial assets [line items]    
Significant unobservable input liabilities 0.525 0.525
Credit spread    
Disclosure of financial assets [line items]    
Significant unobservable input liabilities 0.218 0.218