v3.26.1
Critical accounting judgments and key sources of estimation uncertainty (Details)
$ / shares in Units, £ in Millions
 12 Months Ended
May 27, 2025
D
Jan. 24, 2025
USD ($)
D
$ / shares
shares
Jan. 24, 2025
GBP (£)
D
shares
Dec. 23, 2024
USD ($)
$ / shares
shares
Dec. 23, 2024
GBP (£)
shares
Dec. 31, 2025
$ / shares
shares
Dec. 15, 2021
USD ($)
shares
Critical accounting judgements and key sources of estimation uncertainty              
Number of shares issued | shares           32,060,106  
Share Price | $ / shares   $ 5.6          
Convertible senior secured notes              
Critical accounting judgements and key sources of estimation uncertainty              
Ordinary shares | shares       47,343,585 47,343,585    
Market value per share | $ / shares       $ 7.42      
Convertible senior secured notes | Mudrick capital              
Critical accounting judgements and key sources of estimation uncertainty              
Cash interest rate       10.00%      
Borrowings, paid in kind interest rate       12.00%      
Conversion rate | shares             9.09091
Convertible senior secured notes principal amount, per instrument | $             $ 1,000
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      
Principal amount       $ 130,000,000 £ 104    
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 | shares       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 | shares       285.714      
Convertible senior secured notes principal amount, per instrument | $       $ 1,000      
Tranche A Warrant              
Critical accounting judgements and key sources of estimation uncertainty              
Number of days volume weighted average calculated | D 10 10 10        
Minimum percentage of warrant exercise price 103.00% 103.00% 103.00%        
Warrants expiration period   5 years 5 years        
Measurement term of share price after public disclosure of successful wing-borne flight to determine warrants expiration 30 days 30 days 30 days        
Exercise price per share | $ / shares   $ 6       $ 6  
Value per warrant | $ / shares   $ 2.29          
Tranche B Warrant              
Critical accounting judgements and key sources of estimation uncertainty              
Warrants expiration period   5 years 5 years        
Exercise price per share | $ / shares   $ 7.5          
Value per warrant | $ / shares   $ 3.61          
January 2025 offering              
Critical accounting judgements and key sources of estimation uncertainty              
Number of shares issued | shares   15,000,000 15,000,000     15,000,000  
Gross Proceeds   $ 90,000,000 £ 72        
January 2025 offering | Tranche A Warrant              
Critical accounting judgements and key sources of estimation uncertainty              
Number of shares issued | shares           50,000  
Number of warrants issued | shares   7,500,000 7,500,000        
January 2025 offering | Tranche B Warrant              
Critical accounting judgements and key sources of estimation uncertainty              
Number of warrants issued | shares   7,500,000 7,500,000        
Maximum | Tranche A Warrant              
Critical accounting judgements and key sources of estimation uncertainty              
Warrants expiration period   5 years 5 years