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CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2025
Research and development $ 2,473 [1] $ 20,347 [1] $ 14,034 [2] $ 43,059 [1]
General and administrative 158 [3] 5,538 [3] 3,157 [4] 18,081 [3]
Interest expense 0 [5] 0 [5] 852 [6] 2,185 [5]
Related Party        
Research and development 2,473 6,175 13,185 21,244
General and administrative $ 90 $ 89 571 719
Interest expense     $ 341 $ 865
[1] Includes related party amount of $6,175 and $21,244 for the three and nine months ended September 30, 2025, respectively, and $2,473 for the period from September 19, 2024 (inception) through September 30, 2024.
[2] Includes related party amount of $13,185 for the period from September 19, 2024 (inception) to December 31, 2024 (see Note 12).
[3] Includes related party amount of $89 and $719 for the three and nine months ended September 30, 2025, respectively, and $90 for the period from September 19, 2024 (inception) through September 30, 2024.
[4] Includes related party amount of $571 for the period from September 19, 2024 (inception) to December 31, 2024 (see Note 12).
[5] Includes related party amount of $865 for the nine months ended September 30, 2025.
[6] Includes related party amount of $341 for the period from September 19, 2024 (inception) to December 31, 2024 (see Note 4).