SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Current Liquidity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Accounting Policies [Abstract]
Cash and cash equivalents	$ 22,482	$ 25,021	$ 15,683
Restricted cash and cash equivalents (current and noncurrent)	14,980		25,828
Working capital deficit	(40,948)		(36,978)
Accumulated deficit	(624,544)		$ (633,376)
Net Income (Loss)	8,832	(85,607)
Cash used in operations	$ (38,868)	$ (39,178)