Consolidated Statements of Operations And Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Dec. 31, 2024	Dec. 31, 2025
Research and development	[1]	$ 31,234	$ 93,121
General and administrative	[2]	4,304	20,421
Change in fair value of Convertible Notes payable	[3]	12,600	21,584
Related Party
Research and development		24,600	28,600
General and administrative		1,000	300
Change in fair value of Convertible Notes payable		$ 2,700	$ 4,600

[1] Includes related party amount of $28.6 million for the year ended December 31, 2025 and $24.6 million for the period from June 18, 2024 (inception) to December 31, 2024 (see Note 13).

[2] Includes related party amount of $0.3 million for the year ended December 31, 2025 and $1.0 million for the period from June 18, 2024 (inception) to December 31, 2024 (see Note 13).

[3] Includes related party amount of $4.6 million for the year ended December 31, 2025 and $2.7 million for the period from June 18, 2024 (inception) to December 31, 2024 (see Note 13).