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Nature of the Business and Basis of Presentation (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 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 ($)
Mar. 31, 2025
USD ($)
Jun. 12, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
Jun. 15, 2025
$ / shares
Dec. 31, 2024
USD ($)
$ / 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
Net loss | $       $ 2,631     $ 24,607 $ 21,790 $ 15,148   $ 61,545    
Accumulated deficit | $             79,412       79,412   $ 17,867
Cash used for operating activity | $       $ 0             (44,792)    
Cash and cash equivalents | $             $ 133,265       $ 133,265   $ 34,766
Pre-Merger Sale of Common Stock and Warrants                          
Class of Stock [Line Items]                          
Consideration received | $                   $ 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      
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 | 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      
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