SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION - Schedule of Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ (389,035)		$ (384,451)
Property and equipment purchases in accounts payable	34	$ 34
Common stock issued in exchange for reduction in debt	0	815
Shares issued to settle extension fees and accrued interest for stand-by letters of credit	127	1,370
Cash paid for interest	$ 844	$ 1,434