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Derivative financial liabilities - Additional Information (Details) - 12 months ended Dec. 31, 2021
£ in Thousands, $ in Thousands
GBP (£)
shares
USD ($)
shares
USD ($)
shares
Disclosure of financial liabilities [line items]      
Aggregate purchase price £ 166,981    
Limitation on restricted payments for retention guarantors | $   $ 10,000  
Restricted cash £ 7,420    
Convertible Senior Secured Notes      
Disclosure of financial liabilities [line items]      
Convertible shares | shares 18,181,820 18,181,820  
Conversion ratio per $1000 principal amount | shares 90.9091   90.9091
Additional interest rate 2.00%   2.00%
Convertible Senior Secured Notes | Interest paid in cash      
Disclosure of financial liabilities [line items]      
Interest rate 7.00%   7.00%
Convertible Senior Secured Notes | Interest paid in-kind and semi-annually in arrears      
Disclosure of financial liabilities [line items]      
Interest rate 9.00%   9.00%
Mudrick | Convertible Senior Secured Notes      
Disclosure of financial liabilities [line items]      
Principal amount £ 151,000   $ 200,000
Aggregate purchase price 145,000 $ 192,000  
Convertible Senior Secured Notes Principal Amount 756   $ 1,000
Microsoft and Rocket      
Disclosure of financial liabilities [line items]      
Aggregate purchase price £ 25,000