v3.25.0.1
Financial instruments - Additional Information (Details)
$ / shares in Units, £ in Thousands
 12 Months Ended
Dec. 23, 2024
USD ($)
$ / shares
Dec. 16, 2021
USD ($)
shares
Dec. 15, 2021
USD ($)
Dec. 31, 2024
GBP (£)
Dec. 31, 2023
GBP (£)
Dec. 31, 2024
USD ($)
Dec. 23, 2024
GBP (£)
shares
Dec. 23, 2024
USD ($)
shares
Dec. 15, 2024
Disclosure of financial liabilities [line items]                  
Total interest expense for financial liabilities not held at fair value through profit or loss       £ 156 £ 199        
Change in fair value from own credit risk       £ 22,293          
Percentage of increase in company's own credit spread during the period       11          
Convertible senior secured notes                  
Disclosure of financial liabilities [line items]                  
Convertible Senior Secured Notes Principal Amount | $               $ 1,000  
Principal amount outstanding | $           $ 130,194,859      
Aggregate purchase price | $     $ 192,000,000            
Change in fair value from own credit risk       £ 22,293          
Percentage of increase in company's own credit spread during the period       11          
Convertible senior secured notes | Credit spread                  
Disclosure of financial liabilities [line items]                  
Percentage of decrease in unobservable input       7.50%   7.50%      
Percentage of increase in unobservable input       7.50%   7.50%      
Increase (decrease) in fair value from reasonably possibly increase in unobservable input       £ (10,000)          
Increase (decrease) in fair value from reasonably possibly decrease in unobservable input       £ 10,000          
Convertible senior secured notes | Volatility                  
Disclosure of financial liabilities [line items]                  
Percentage of decrease in unobservable input       10.00%   10.00%      
Percentage of increase in unobservable input       10.00%   10.00%      
Increase (decrease) in fair value from reasonably possibly increase in unobservable input       £ (10,000)          
Increase (decrease) in fair value from reasonably possibly decrease in unobservable input       £ 10,000          
Convertible senior secured notes | Minimum                  
Disclosure of financial liabilities [line items]                  
Term of US Government debt to calculate interest rate, fair value measurement inputs       3 years          
Historical share price volatility period of comparable companies, fair value measurement inputs       3 months          
Convertible senior secured notes | Maximum                  
Disclosure of financial liabilities [line items]                  
Term of US Government debt to calculate interest rate, fair value measurement inputs       5 years          
Historical share price volatility period of comparable companies, fair value measurement inputs       4 years          
Convertible senior secured notes | Interest paid in-kind and semi-annually in arrears                  
Disclosure of financial liabilities [line items]                  
Interest rate                 12.00%
Convertible senior secured notes | Interest paid in cash                  
Disclosure of financial liabilities [line items]                  
Interest rate                 10.00%
Convertible senior secured notes | First half of principal amount                  
Disclosure of financial liabilities [line items]                  
Conversion rate | shares             363.636 363.636  
Principal amount converted | $ $ 130,194,859                
Convertible senior secured notes | Remaining half of principal amount                  
Disclosure of financial liabilities [line items]                  
Conversion rate | shares             285.714 285.714  
Convertible senior secured notes | Level 3                  
Disclosure of financial liabilities [line items]                  
Carrying Value       £ 524,242     £ 574,476    
Market value per share | $ / shares $ 7.42                
Financial liabilities at fair value through profit and loss category                  
Disclosure of financial liabilities [line items]                  
Carrying Value       524,676 110,198        
Financial liabilities at fair value through profit and loss category | Convertible senior secured notes                  
Disclosure of financial liabilities [line items]                  
Carrying Value       524,242 109,291        
Convertible note                  
Disclosure of financial liabilities [line items]                  
Maturity term   five-year              
Conversion rate | shares   90.9091              
Convertible Senior Secured Notes Principal Amount | $   $ 1,000              
Convertible note | Interest paid in-kind and semi-annually in arrears                  
Disclosure of financial liabilities [line items]                  
Interest rate   9.00%              
Convertible note | Interest paid in cash                  
Disclosure of financial liabilities [line items]                  
Interest rate   7.00%              
Convertible senior secured notes | Level 3                  
Disclosure of financial liabilities [line items]                  
Carrying Value       £ 524,242 £ 109,291