v3.25.2
Nature of Business (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 22 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
Jun. 30, 2025
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
shares
Feb. 27, 2025
USD ($)
shares
Jan. 31, 2025
£ / shares
shares
Dec. 31, 2024
USD ($)
Feb. 29, 2024
$ / shares
Jun. 30, 2023
USD ($)
Conversion of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares)   1   1                          
Proceeds from the exercise of warrants                   $ 0 $ 37,258            
Net loss           $ (38,403) $ (17,864) $ (38,101) $ (35,187) (56,267) (73,288)            
Accumulated deficit           590,999       590,999   $ 590,999     $ 534,732    
Cash and cash equivalents           $ 221,881   $ 228,628   221,881 $ 228,628 $ 221,881     $ 165,081    
PIPE Warrants                                  
Conversion of Stock [Line Items]                                  
Sale of stock, shares issued in transaction (in shares) | shares           0           3,752,050          
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]                                  
Warrant exercise price (in dollars per share) | $ / shares $ 5.7960         $ 5.7960       $ 5.7960   $ 5.7960          
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
Initial Public Offering | American Depositary Shares                                  
Conversion of Stock [Line Items]                                  
Maximum amount of stock that may be sold       $ 150,000                          
Amount authorized       $ 150,000                 $ 150,000        
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        
At-The-Market Offering | American Depositary Shares                                  
Conversion of Stock [Line Items]                                  
Amount authorized                         $ 150,000        
Private Placement                                  
Conversion of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares)     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                            
Warrant exercise price (in dollars per share) | $ / shares                               $ 9.93  
Private Placement | PIPE Warrants                                  
Conversion of Stock [Line Items]                                  
Warrant exercise price (in dollars per share) | $ / shares   $ 9.93                              
Term (in years)                               3 years  
Underwritten Offering | 2025 ADS Warrants                                  
Conversion of Stock [Line Items]                                  
Ordinary share conversion ratio (in shares) 1       1                        
Sale of stock, shares issued in transaction (in shares) | shares 24,014,728       24,014,728                        
Sale of stock, price per share (in dollars per share) | (per share)         $ 4.2750                 £ 0.008      
Warrant exercise 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                        
Warrant exercise price (in dollars per share) | $ / shares         $ 0.0001                        
Purchase of warrants (in shares) | shares         11,044,720                 11,044,720