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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 72	$ 111
Change in value of investments accounted for at fair value	(391)	375
Change in value of warrant liabilities	1,146	(732)
Change in value of Convertible Debentures	465	(1,436)
Foreign exchange gain	1,236	0
Other	(36)	(1)
Other income (loss)	$ 2,492	$ (1,683)

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