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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 14	$ 56	$ 25	$ 128
Change in value of investments accounted for at fair value	(435)	527	1,021	136
Change in value of warrant liabilities	(3,546)	(1,238)	(7,050)	(92)
Change in value of Convertible Debentures	0	(465)	0
Foreign exchange gain (loss)	659	(255)	320	981
Other	873	0	1,202	(36)
Other income (loss)	$ (2,435)	$ (1,375)	$ (4,482)	$ 1,117

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