v3.25.0.1
Critical accounting judgments and key sources of estimation uncertainty (Details)
$ / shares in Units, £ in Thousands
 12 Months Ended
Dec. 16, 2021
USD ($)
shares
Dec. 16, 2021
GBP (£)
shares
Dec. 15, 2021
USD ($)
shares
Dec. 31, 2024
Dec. 31, 2022
Dec. 23, 2024
USD ($)
$ / shares
shares
Dec. 15, 2024
USD ($)
$ / shares
shares
Dec. 15, 2021
GBP (£)
shares
Convertible senior secured notes | Mudrick capital                
Critical accounting judgements and key sources of estimation uncertainty                
Principal amount     $ 200,000,000         £ 151,000
Aggregate purchase price $ 192,000,000 £ 145,000 $ 192,000,000          
Cash interest rate             10.00%  
Borrowings, paid in kind interest rate             12.00%  
Conversion rate     9.09091         9.09091
2021 Incentive Plan                
Critical accounting judgements and key sources of estimation uncertainty                
Quarterly vesting percentage         6.25%      
Measurement term of US Government gilt bonds to determine fair value of options granted       5 years        
First half of principal amount | Convertible senior secured notes                
Critical accounting judgements and key sources of estimation uncertainty                
Conversion price (Per share price) | $ / shares           $ 2.75    
Conversion rate           363.636    
Convertible senior secured notes principal amount, per instrument | $           $ 1,000    
First half of principal amount | Convertible senior secured notes | Mudrick capital                
Critical accounting judgements and key sources of estimation uncertainty                
Conversion price (Per share price) | $ / shares             $ 2.75  
Conversion rate             363.636  
Convertible senior secured notes principal amount, per instrument | $             $ 1,000  
Remaining half of principal amount | Convertible senior secured notes | Mudrick capital                
Critical accounting judgements and key sources of estimation uncertainty                
Conversion price (Per share price) | $ / shares             $ 3.5  
Conversion rate             285.714  
Convertible senior secured notes principal amount, per instrument | $             $ 1,000  
Convertible note                
Critical accounting judgements and key sources of estimation uncertainty                
Conversion rate 90.9091 90.9091