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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 134	$ 84	$ 386	$ 157
Change in value of investments accounted for at fair value	(589)	1,127	(576)	1,570
Change in value of warrant liabilities	2,166	(2,722)	3,281	(3,802)
Change in value of convertible debentures	940	(1,455)	447	(1,135)
Sale of surplus assets	0	0	0	293
Foreign exchange gain (loss)	(15)	(170)	(34)	(60)
Gain on sale of assets held for sale	0	0	0	341
Other	(324)	(129)	(323)	(67)
Other income (loss)	$ 2,312	$ (3,265)	$ 3,181	$ (2,703)

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