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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Interest income | $ 50 | $ 29
Change in value of investments accounted at fair value | (224) | 499
Change in value of warrant liabilities | 364 | (2,193)
Change in value of convertible debentures | (145) | (922)
Sale of surplus assets | 14 | 793
Other | 4 | (123)
Other income | $ 63 | $ (1,917)

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- Definition Change in value of convertible debentures + References No definition available. + Details
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- Definition Change in value of investments accounted at fair value + References No definition available. + Details
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- Definition Change in value of warrant liabilities + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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