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Convertible Preferred Shares and Shareholders' Equity (Deficit) - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 7 Months Ended
Sep. 19, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
shares
Dec. 31, 2025
vote
$ / shares
shares
Jun. 16, 2025
$ / shares
Jun. 15, 2025
$ / shares
Jun. 13, 2025
$ / shares
shares
Jun. 12, 2025
$ / shares
Feb. 14, 2025
$ / 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     $ 0.001
Common stock, issued (in shares)     27,556,767           1,018,604
Common stock, outstanding (in shares)     27,556,767           1,018,604
Common stock, number of votes | vote     1            
Common stock reserved for issuance of conversion shares (in shares)     14,124,815            
Pre-Funded Warrant                  
Class of Stock [Line Items]                  
Estimated purchase price warrants (in dollars per share) | $ / shares     $ 0.001     $ 0.001 $ 1.9109 $ 1.9109  
Estimated purchase price (in dollars per share) | $ / shares     $ 13.410       $ 13.22    
Warrants, exercisable (in shares)     131,434            
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      
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 convertible preferred stock | $ $ 4.0                
Series A Preferred Stock                  
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