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Convertible Notes Payable (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 13, 2025
Jun. 12, 2025
Sep. 30, 2024
 [3]
Oct. 31, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2025
Debt Instrument [Line Items]              
Notes payable, noncurrent [1]         $ 0 $ 37,482 [2] $ 0
Interest expense     $ 0   0 [3] 852 [4] 2,185 [3]
Ordinary Shares              
Debt Instrument [Line Items]              
Number of shares issued and sold (in shares)   85,506,824          
Stock converted (in shares) 12,355,716            
Pre-Funded Warrant              
Debt Instrument [Line Items]              
Warrants converted (in shares) 2,767,122            
Related Party              
Debt Instrument [Line Items]              
Notes payable, noncurrent           14,993  
Interest expense           $ 341 865
Convertible Notes Payable              
Debt Instrument [Line Items]              
Number of exercisable shares (in shares)   21,200,564          
Number of shares issued and sold (in shares)   8,392,303          
Consideration received       $ 37,500      
Accrued interest   $ 3,000          
Convertible Notes Payable | Ordinary Shares              
Debt Instrument [Line Items]              
Stock converted (in shares) 1,850,790            
Convertible Notes Payable | Pre-Funded Warrant              
Debt Instrument [Line Items]              
Warrants converted (in shares) 1,212,683            
Fairmount Convertible Note Purchase Agreement | Convertible Notes Payable              
Debt Instrument [Line Items]              
Convertible notes payable       $ 37,500 0   0
Accrue interest rate       12.00%   12.00%  
Debt instrument, increase limit       $ 37,500      
Notes payable, noncurrent           $ 37,500  
Debt issuance costs (less than)           100 100
Interest expense         $ 0 900 $ 2,200
Non-cash interest expense related to the amortization of debt issuance costs (less than)           $ 100  
Number of exercisable shares (in shares)   12,808,261          
Fairmount Convertible Note Purchase Agreement | Convertible Notes Payable | Maximum              
Debt Instrument [Line Items]              
Debt instrument, higher borrowing capacity option       75,000      
Fairmount Convertible Note Purchase Agreement | Convertible Notes Payable | Related Party              
Debt Instrument [Line Items]              
Convertible notes payable       $ 15,000      
[1] Includes related party amount of $14,993 as of December 31, 2024
[2] Includes related party amount of $14,993 as of December 31, 2024 (see Note 4).
[3] Includes related party amount of $865 for the nine months ended September 30, 2025.
[4] Includes related party amount of $341 for the period from September 19, 2024 (inception) to December 31, 2024 (see Note 4).