SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Supplemental Financial Information [Abstract]
Research and development	$ 9,263	$ 1,796
Compensation and other employee liabilities	1,843	4,207
Interest	241	249
Operating lease liability, current	142	133
Operating lease liability, noncurrent	77	150
Operating lease liability	219	283
Other, current	161	230
Other, noncurrent	0	0
Other	161	230
Accrued expenses and other current liabilities	$ 11,650	$ 6,615
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Other liabilities, long-term	$ 77	$ 150
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities, long-term	Other liabilities, long-term
Total	$ 11,727	$ 6,765