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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 11	$ 72
Change in value of investments accounted for at fair value	1,456	(391)
Change in value of warrant liabilities	(3,504)	1,146
Change in value of Convertible Debentures	0	465
Foreign exchange gain (loss)	(339)	1,236
Other	329	(36)
Other income (loss)	$ (2,047)	$ 2,492

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