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Nature of the Business and Basis of Presentation (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 5 Months Ended 8 Months Ended 9 Months Ended
Jun. 16, 2025
$ / shares
shares
Jun. 13, 2025
$ / shares
shares
Jun. 12, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Jun. 30, 2025
shares
Oct. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Feb. 14, 2025
USD ($)
$ / shares
Jun. 12, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
Jun. 15, 2025
$ / shares
Class of Stock [Line Items]                            
Stock split, conversion ratio   0.01                        
Common stock, par value (in dollars per share) | $ / shares $ 0.001 $ 0.001         $ 0.001     $ 0.001     $ 0.001 $ 0.001
Net loss | $       $ 2,631     $ 24,607 $ 21,790 $ 15,148 $ 17,867     $ 61,545  
Accumulated deficit | $             79,412     17,867     79,412  
Cash used for operating activity | $       $ 0           (6,269)     (44,792)  
Cash and cash equivalents | $             $ 133,265     34,766     $ 133,265  
Cash | $                   $ 34,766        
Pre-Merger Sale of Common Stock and Warrants                            
Class of Stock [Line Items]                            
Consideration received | $                     $ 200,000 $ 200,000    
Series Seed Convertible Preferred Stock                            
Class of Stock [Line Items]                            
Convertible preferred stock, par value (in dollars per shares) | $ / shares             $ 0.0001     $ 0.0001     $ 0.0001  
Series A Non-Voting Preferred Shares                            
Class of Stock [Line Items]                            
Preferred stock, par value (in dollars per share) | $ / shares             $ 0.001     $ 0.001     $ 0.001  
Recapitalization exchange ratio   0.0001445                        
Number of exercisable shares (in shares)         2,890                  
Shares issued upon conversion (in shares) 1                          
Ordinary Shares                            
Class of Stock [Line Items]                            
Recapitalization exchange ratio   0.1445                        
Number of shares issued and sold (in shares)     85,506,824                      
Warrants, exercisable (in shares)   2,767,122 19,149,690                 19,149,690    
Estimated purchase price (in dollars per share) | $ / shares     $ 1.9110               $ 1.9110 $ 1.9110    
Stock converted (in shares)   12,355,716                        
Shares issued upon conversion (in shares) 1                          
Convertible Notes Payable                            
Class of Stock [Line Items]                            
Number of shares issued and sold (in shares)     8,392,303                      
Consideration received | $           $ 37,500                
Accrued interest | $     $ 3,000                      
Number of exercisable shares (in shares)     21,200,564                      
Convertible Notes Payable | Fairmount Convertible Note Purchase Agreement                            
Class of Stock [Line Items]                            
Number of exercisable shares (in shares)     12,808,261                      
Convertible notes payable | $           37,500 $ 0           $ 0  
Convertible Notes Payable | Fairmount Convertible Note Purchase Agreement | Related Party                            
Class of Stock [Line Items]                            
Convertible notes payable | $           15,000                
Convertible Notes Payable | Fairmount Convertible Note Purchase Agreement | Fairmount Healthcare Fund II L.P. | Related Party                            
Class of Stock [Line Items]                            
Convertible notes payable | $           $ 15,000                
Convertible Notes Payable | Ordinary Shares                            
Class of Stock [Line Items]                            
Stock converted (in shares)   1,850,790                        
Pre-Funded Warrant                            
Class of Stock [Line Items]                            
Warrants, issued and sold (in shares)     19,149,690                      
Estimated purchase price (in dollars per share) | $ / shares     $ 13.22                 13.22    
Estimated purchase price warrants (in dollars per share) | $ / shares   $ 1.000 $ 1.9109               $ 1.9109 $ 1.9109    
Warrants converted (in shares)   2,767,122                        
Pre-Funded Warrant | Convertible Notes Payable                            
Class of Stock [Line Items]                            
Warrants converted (in shares)   1,212,683