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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 56	$ 142	$ 128	$ 252
Change in value of investments accounted for at fair value	527	(362)	136	13
Change in value of warrant liabilities	(1,238)	1,846	(92)	1,115
Change in value of Convertible Debentures	(465)	943	0	(493)
Foreign exchange (loss) gain	(255)	(16)	981	(19)
Other	0	(1)	(36)	1
Other (loss) income	$ (1,375)	$ 2,552	$ 1,117	$ 869

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