Segment Reporting - Summary Of Significant Expense Categories For The Segment (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Dec. 31, 2024	Dec. 31, 2025
Segment Reporting
External research and development costs	[1]	$ 31,234	$ 93,121
Total operating expenses		(35,538)	(113,542)
Operating Segments
Segment Reporting
Research and development personnel-related costs (including stock-based compensation)		3,509	28,560
Other research and development costs		155	2,472
General and administrative personnel-related costs (including stock-based compensation)		1,714	12,691
Professional and consulting fees		2,253	6,933
Other general and administrative costs		337	797
Total operating expenses		35,538	113,542
JADE101 | Operating Segments
Segment Reporting
External research and development costs		22,992	28,943
JADE201 | Operating Segments
Segment Reporting
External research and development costs		2,437	24,249
JADE301 | Operating Segments
Segment Reporting
External research and development costs		$ 2,141	$ 8,897

[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).