v3.26.1
Shareholders’ Equity/(Deficit) (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 16 Months Ended 34 Months Ended 41 Months Ended
Feb. 19, 2026
USD ($)
$ / shares
shares
Jan. 13, 2025
USD ($)
shares
Aug. 18, 2023
$ / shares
shares
Oct. 08, 2021
USD ($)
Feb. 28, 2026
USD ($)
shares
Mar. 31, 2026
USD ($)
shares
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2026
£ / shares
shares
Jun. 30, 2026
USD ($)
shares
Feb. 27, 2025
USD ($)
shares
Jan. 13, 2025
£ / shares
shares
Jan. 13, 2025
$ / shares
shares
Feb. 29, 2024
Dec. 31, 2023
Jun. 30, 2023
USD ($)
shares
Class of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares)       1                          
Number of shares available for purchase, percent of principal amount of term loan (as a percent)                               0.025 0.025
Number of options exercisable (in shares) | shares                                 94,222
Fair value of exercisable options                                 $ 700
Proceeds from issuance of pre-funded warrants associated with the 2025 Offering, net of issuance costs             $ 1 $ 0                  
PIPE Warrants                                  
Class of Stock [Line Items]                                  
Warrant exercise price (in dollars per share) | $ / shares     $ 9.93                            
Issuance of ordinary shares to settle warrant exercised (in shares) | shares             515,000       4,267,050            
Proceeds from the exercise of ADS warrants             $ 5,114     $ 42,400            
Proceeds from warrant exercises, fully exercised             117,300                    
ADS Warrants                                  
Class of Stock [Line Items]                                  
Proceeds from issuance of pre-funded warrants associated with the 2025 Offering, net of issuance costs   $ 149,800                              
Issuance costs of warrant   $ 9,400                              
Issuance of February 2026 Offering of pre-funded warrants             32,542                    
Pre-Funded Warrants                                  
Class of Stock [Line Items]                                  
Issuance of February 2026 Offering of pre-funded warrants           $ 33,700 $ 33,719                    
PIPE warrants remain outstanding | shares             23,848,829   23,848,829 23,848,829 23,848,829            
Hercules Capital, Inc.                                  
Class of Stock [Line Items]                                  
Term (in years)                                 10 years
Number of options exercisable (in shares) | shares                                 94,222
Fair value of exercisable options                                 $ 700
At-The-Market Offering                                  
Class of Stock [Line Items]                                  
Sale of stock, shares issued in transaction (in shares) | shares                 108,000     5,491,836          
Consideration received on transaction                 $ 1,400     $ 54,800          
Sale of stock, average price per share (in dollars per share) | £ / shares                   £ 13.2649              
Private Placement                                  
Class of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares)     1                            
Sale of stock, shares issued in transaction (in shares) | shares     16,076,750                            
Sale of stock, price per share (in dollars per share) | $ / shares     $ 7.78                            
Private Placement | PIPE Warrants                                  
Class of Stock [Line Items]                                  
Term (in years)                             3 years    
Underwritten Offering                                  
Class of Stock [Line Items]                                  
Sale of stock, shares issued in transaction (in shares) | shares         15,160,619                        
Consideration received on transaction $ 140,500                                
Underwritten Offering | ADS Warrants                                  
Class of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares)   1                              
Sale of stock, shares issued in transaction (in shares) | shares   24,014,728                              
Sale of stock, price per share (in dollars per share) | (per share)                         £ 0.008 $ 4.2750      
Warrant exercise price (in dollars per share) | $ / shares                           $ 5.7960      
Issuance of ordinary shares to settle warrant exercised (in shares) | shares         35,059,448                        
Purchase of warrants (in shares) | shares         19,898,829               24,014,728 24,014,728      
Proceeds from issuance and exercises of warrants         $ 203,200                        
Underwritten Offering | Pre-Funded Warrants                                  
Class of Stock [Line Items]                                  
Sale of stock, price per share (in dollars per share) | $ / shares $ 7.9999                         $ 4.2649      
Warrant exercise price (in dollars per share) | $ / shares                           $ 0.0001      
Purchase of warrants (in shares) | shares 1,250,000                       11,044,720 11,044,720      
Warrants exercised (in shares) | shares           6,000,000                      
Underwritten Offering | 2026 ADS Warrants                                  
Class of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares) 1                                
Sale of stock, shares issued in transaction (in shares) | shares 17,500,000                                
Sale of stock, price per share (in dollars per share) | $ / shares $ 8.00                                
American Depositary Shares | Initial Public Offering                                  
Class of Stock [Line Items]                                  
Amount authorized       $ 150,000                          
American Depositary Shares | At-The-Market Offering                                  
Class of Stock [Line Items]                                  
Amount authorized                       $ 150,000