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SEGMENT REPORTING - Schedule of Segment Revenue and Significant Segment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
REVENUE:
Total segment revenue	$ 0		$ 18,168		$ 367	$ 229,414
LESS:
Research and development	(22,331)		(43,503)		(38,428)	(92,212)
Other external costs	(5,377)		(8,542)		(11,576)	(17,405)
Net income (loss)	(28,710)	$ (23,708)	(30,696)	$ 148,451	(52,418)	117,755
Reportable Segment
REVENUE:
Total segment revenue	0		18,168		367	229,414
LESS:
Compensation costs (excluding stock based compensation)	(7,725)		(13,842)		(15,915)	(27,619)
Other segment items	(3,618)		(178)		(8,121)	(13,336)
Net income (loss)	(28,710)		(30,696)		(52,418)	117,755
Reportable Segment | Rinvatercept program expenses
LESS:
Research and development	(4,101)		(1,431)		(6,751)	(2,948)
Reportable Segment | Elritercept program expenses
LESS:
Research and development	(14)		(15,636)		(17)	(34,531)
Reportable Segment | Cibotercept program expenses
LESS:
Research and development	(267)		(4,059)		57	(9,967)
Reportable Segment | Preclinical & development expenses
LESS:
Research and development	(6,111)		(1,981)		(8,117)	(3,725)
Reportable Segment | Other external costs
LESS:
Other external costs	$ (6,874)		$ (11,737)		$ (13,921)	$ (19,533)

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