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Derivative financial liabilities - Additional Information (Details)
£ in Thousands, $ in Thousands
6 Months Ended
Jun. 15, 2022
GBP (£)
Jun. 15, 2022
USD ($)
Dec. 16, 2021
GBP (£)
shares
Dec. 16, 2021
USD ($)
shares
Jun. 30, 2022
GBP (£)
Jun. 30, 2021
GBP (£)
Jun. 30, 2022
USD ($)
Dec. 16, 2021
USD ($)
shares
Disclosure of financial liabilities [line items]                
Aggregate purchase price           £ 25,000    
Mudrick                
Disclosure of financial liabilities [line items]                
Increase through accumulating interest         £ 7,005      
Mudrick | Convertible loan notes                
Disclosure of financial liabilities [line items]                
Principal amount     £ 151,000         $ 200,000
Aggregate purchase price     £ 145,000 $ 192,000        
Convertible shares | shares     18,181,820 18,181,820        
Conversion ratio per $1000 principal amount | shares     90.9091         90.9091
Denominator in calculation of number of equity instruments holder of convertible debt is entitled to, notional amount     £ 824         $ 1,000
Interest rate         9.00%   9.00%  
Increase through accumulating interest £ 7,005 $ 8,950            
Mandatory cash balance under loan covenants | $             $ 10,000  
Restricted cash         £ 8,235