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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 84	$ 57	$ 157	$ 118
Change in value of investments accounted at fair value	1,127	(113)	1,570	505
Change in value of warrant liabilities	(2,722)	571	(3,802)	1,416
Change in value of convertible debentures	(1,455)	160	(1,135)	(615)
Sale of surplus assets	0	0	293	1,138
Foreign exchange gain (loss)	(170)	0	(60)	0
Gain on sale of assets held for sale	0	0	341	0
Other	(129)	14	(67)	(110)
Other income	$ (3,265)	$ 689	$ (2,703)	$ 2,452

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Change in value of convertible debentures

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Change in value of investments accounted at fair value

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Other

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount of income (expense) related to nonoperating activities, classified as other.

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