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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 44	$ 153	$ 482
Change in value of investments accounted for at fair value	7,106	1,835	(153)
Change in value of warrant liabilities	(8,078)	(5,436)	3,726
Change in value of Convertible Debentures	0	155	291
Foreign exchange gain (loss)	(128)	767	(46)
Other	350	233	(322)
Other income (loss)	1,194	(2,293)	3,978
Department Of Energy Award	$ 1,900	$ 0	$ 0

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Change in value of investments accounted at fair value

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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