SEGMENT REPORTING - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Research and development
General and administrative	$ 4,625	$ 4,848	$ 9,729	$ 10,173
Other income, net	(800)	(3,844)	(2,374)	(6,745)
Segment net loss	40,950	20,537	69,746	35,410
Reportable Segment
Research and development
External costs	31,559	13,862	50,986	21,168
Internally-managed costs	4,556	4,790	9,409	9,088
General and administrative	3,121	3,243	6,722	6,913
Other segment expenses	2,514	2,486	5,003	4,986
Other income, net	(800)	(3,844)	(2,374)	(6,745)
Segment net loss	$ 40,950	$ 20,537	$ 69,746	$ 35,410