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Derivative financial liabilities - Additional Information (Details)
6 Months Ended
Jun. 15, 2023
GBP (£)
Jun. 15, 2023
USD ($)
Dec. 16, 2021
GBP (£)
shares
Dec. 16, 2021
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2023
GBP (£)
Dec. 16, 2021
USD ($)
shares
Financial liabilities              
Restricted cash | £           £ 7,865,000  
Mudrick | Convertible Senior Secured Notes [Member]              
Financial liabilities              
Principal amount     £ 151,000,000       $ 200,000,000
Aggregate purchase price     £ 145,000,000 $ 192,000,000      
Convertible shares | shares     18,181,820 18,181,820      
Conversion rate | shares     90.9091       90.9091
Convertible senior secured notes principal amount, per instrument     £ 824       $ 1,000
Increase in nominal amount of outstanding Convertible Senior Secured Notes £ (7,963,000) $ (9,826,000)          
Mandatory cash balance under loan covenants | $         $ 10,000,000    
Restricted cash | £           £ 7,865,000  
Mudrick | Convertible Senior Secured Notes [Member] | Interest paid in-kind and semi-annually in arrears              
Financial liabilities              
Interest rate           9.00%