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ORGANIZATION - Components of Current Liquidity (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 199,349						$ 199,349		$ 63,892
Debt securities available for sale	12,026						12,026		98,592
Unrestricted liquidity	211,375						211,375		162,484
Less: Other Ironton set-aside	0						0		54,560
Available unrestricted liquidity	211,375						211,375		107,924
Restricted Cash (current and non-current)	184,790						184,790		163,631
Working capital	205,375						205,375		197,916
Accumulated deficit	(320,057)						(320,057)		$ (242,525)
Net loss	$ 4,886	$ (56,576)	$ (25,842)	$ (34,948)	$ (15,004)	$ (25,432)	$ (77,532)	$ (75,384)

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