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Convertible Preferred Shares and Shareholders' Equity (Deficit) - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 4 Months Ended
Sep. 19, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
vote
$ / shares
shares
Sep. 30, 2025
vote
$ / shares
shares
Jun. 16, 2025
$ / shares
Jun. 15, 2025
$ / shares
Jun. 13, 2025
$ / shares
shares
Jun. 12, 2025
$ / shares
shares
Feb. 14, 2025
$ / shares
Class of Stock [Line Items]                    
Common stock, authorized (in shares)       40,000,000 175,000,000          
Common stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001    
Common stock, issued (in shares)       1,018,604 13,892,516          
Common stock, outstanding (in shares)       1,018,604 13,892,516          
Common stock, number of votes | vote       1 1          
Common stock reserved for issuance of conversion shares (in shares)       3,972,893 12,340,650          
Cash dividends | $       $ 0.0            
Pre-Funded Warrant                    
Class of Stock [Line Items]                    
Estimated purchase price warrants (in dollars per share) | $ / shares               $ 1.000 $ 1.9109 $ 1.9109
Estimated purchase price (in dollars per share) | $ / shares                 13.22  
Warrants exercised (in shares)         0          
Ordinary Shares                    
Class of Stock [Line Items]                    
Estimated purchase price (in dollars per share) | $ / shares                 $ 1.9110 $ 1.9110
Warrants, exercisable (in shares)               2,767,122 19,149,690  
Common stock, issued (in shares)       722,500            
Common stock, outstanding (in shares)       722,500            
Closing of underwritten public offering, minimum price | $ / shares       $ 1.00            
Closing of underwritten public offering, minimum proceeds | $       $ 50.0            
Series Seed Convertible Preferred Stock                    
Class of Stock [Line Items]                    
Convertible preferred stock, conversion ratio       0.0001445            
Conversion price (in dollars per share) | $ / shares $ 0.20                  
Series Seed Convertible Preferred Stock | Related Party | Fairmount Healthcare Fund II L.P.                    
Class of Stock [Line Items]                    
Convertible preferred stock, issued (in shares) 20,000,000   20,000,000              
Convertible preferred stock, purchase price (in dollars per share) | $ / shares $ 0.20   $ 0.20              
Issuance of Series Seed convertible preferred stock | $ $ 4.0   $ 4.0              
Series A Non-Voting Preferred Shares                    
Class of Stock [Line Items]                    
Number of exercisable shares (in shares)   2,890                
Convertible preferred stock, conversion ratio         1,000          
RSAs                    
Class of Stock [Line Items]                    
Common stock, issued (in shares)       296,104 168,215          
Common stock, outstanding (in shares)       296,104 168,215          
Early Exercised Stock Options                    
Class of Stock [Line Items]                    
Common stock, issued (in shares)         811          
Common stock, outstanding (in shares)         811