v3.26.1
Nature of Business (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended 41 Months Ended
Jan. 13, 2025
day
$ / shares
shares
Aug. 18, 2023
$ / shares
shares
Aug. 16, 2023
$ / shares
shares
Oct. 08, 2021
USD ($)
Jan. 31, 2025
day
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
Feb. 27, 2025
USD ($)
shares
Jan. 31, 2025
£ / shares
shares
Feb. 29, 2024
Jun. 30, 2023
USD ($)
Conversion of Stock [Line Items]                      
Ordinary share conversion ratio   1   1              
Proceeds from the exercise of warrants           $ 0 $ 37,258        
Net loss           (287,862) (155,122)        
Accumulated deficit           822,594 534,732        
Cash and cash equivalents           $ 149,608 $ 165,081        
PIPE Warrants                      
Conversion of Stock [Line Items]                      
Sale of stock, shares issued in transaction (in shares) | shares           0 3,752,050        
Term (in years)           1 year 1 month 6 days       3 years  
Proceeds from the exercise of warrants           $ 37,300 $ 37,300        
Proceeds from warrant exercises, fully exercised           $ 122,400          
2025 ADS Warrants                      
Conversion of Stock [Line Items]                      
Purchase price (in dollars per share) | $ / shares $ 5.7960         $ 5.7960          
Term (in years)           3 years          
Pre-funded Warrants                      
Conversion of Stock [Line Items]                      
Term (in years)           3 years          
Loan Agreement                      
Conversion of Stock [Line Items]                      
Convertible notes, face amount                     $ 50,000
Loan Agreement, Term Loan One                      
Conversion of Stock [Line Items]                      
Convertible notes, face amount                     $ 30,000
At-The-Market Offering                      
Conversion of Stock [Line Items]                      
Sale of stock, shares issued in transaction (in shares) | shares               5,491,836      
Consideration received on transaction               $ 54,800      
Private Placement                      
Conversion of Stock [Line Items]                      
Ordinary share conversion ratio     1                
Sale of stock, shares issued in transaction (in shares) | shares   16,076,750 16,076,750     3,752,050          
Sale of stock, price per share (in dollars per share) | $ / shares     $ 7.78                
Purchase price (in dollars per share) | $ / shares     $ 9.93                
Private Placement | PIPE Warrants                      
Conversion of Stock [Line Items]                      
Purchase price (in dollars per share) | $ / shares   $ 9.93                  
Term (in years)                   3 years  
Underwritten Offering                      
Conversion of Stock [Line Items]                      
Consideration received on transaction           $ 140,500          
Underwritten Offering | 2025 ADS Warrants                      
Conversion of Stock [Line Items]                      
Ordinary share conversion ratio 1       1            
Sale of stock, shares issued in transaction (in shares) | shares 24,014,728       24,014,728            
Consideration received on transaction           $ 203,200          
Sale of stock, price per share (in dollars per share) | (per share)         $ 4.2750       £ 0.008    
Purchase price (in dollars per share) | $ / shares         $ 5.7960            
Term (in years)         3 years       3 years    
Purchase of warrants (in shares) | shares         24,014,728       24,014,728    
Threshold consecutive trading days | day 3       3            
Underwritten Offering | Pre-funded Warrants                      
Conversion of Stock [Line Items]                      
Sale of stock, price per share (in dollars per share) | $ / shares         $ 4.2649            
Purchase price (in dollars per share) | $ / shares         $ 0.0001            
Purchase of warrants (in shares) | shares         11,044,720       11,044,720    
Warrants exercised (in shares) | shares           2,344,720          
American Depositary Shares | Initial Public Offering                      
Conversion of Stock [Line Items]                      
Maximum amount of stock that may be sold       $ 150,000              
Amount of stock authorized       $ 150,000              
American Depositary Shares | At-The-Market Offering                      
Conversion of Stock [Line Items]                      
Amount of stock authorized               $ 150,000