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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ (4)	$ 134	$ 124	$ 386
Change in value of investments accounted for at fair value	258	(589)	394	(576)
Change in value of warrant liabilities	307	2,166	215	3,281
Change in value of Convertible Debentures	153	940	153	447
Foreign exchange gain (loss)	(105)	(15)	876	(34)
Other	19	(324)	(17)	(323)
Other income	$ 628	$ 2,312	$ 1,745	$ 3,181

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