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Convertible Preferred Shares and Shareholders' Equity (Deficit) - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 4 Months Ended
Sep. 19, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
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
Dec. 31, 2024
$ / shares
shares
Class of Stock [Line Items]                
Common stock, authorized (in shares)     175,000,000         40,000,000
Common stock, par value (in dollars per share) | $ / shares     $ 0.001 $ 0.001 $ 0.001     $ 0.001
Common stock, issued (in shares)     13,892,516         1,018,604
Common stock, outstanding (in shares)     13,892,516         1,018,604
Common stock, number of votes | vote     1          
Common stock reserved for issuance of conversion shares (in shares)     12,340,650          
Pre-Funded Warrant                
Class of Stock [Line Items]                
Estimated purchase price warrants (in dollars per share) | $ / shares           $ 1.000 $ 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  
Warrants, exercisable (in shares)           2,767,122 19,149,690  
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              
Convertible preferred stock, purchase price (in dollars per share) | $ / shares $ 0.20              
Issuance of Series Seed convertible preferred stock | $ $ 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)     168,215          
Common stock, outstanding (in shares)     168,215          
Early Exercised Stock Options                
Class of Stock [Line Items]                
Common stock, issued (in shares)     811          
Common stock, outstanding (in shares)     811