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Paragon Option Agreements - Expenses Related Development Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2025
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and development expense $ 2,473 [1] $ 20,347 [1] $ 14,034 [2] $ 43,059 [1]
General and administrative expense 158 [3] 5,538 [3] $ 3,157 [4] 18,081 [3]
Paragon Therapeutics | License Agreement Terms | Paragon Option Agreements        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and development expense 2,473 6,184   19,217
General and administrative expense 90 89   569
Operating costs and expenses, total $ 2,563 $ 6,273   $ 19,786
[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).