SEGMENT REPORTING - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Research and development
General and administrative	$ 4,665	$ 5,104
Other income, net	(412)	(1,574)
Segment net loss	20,737	28,796
Reportable Segment
Research and development
External costs	10,759	19,427
Internally managed costs	4,695	4,853
General and administrative	3,287	3,601
Other segment expenses	2,408	2,489
Other income, net	(412)	(1,574)
Segment net loss	$ 20,737	$ 28,796