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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Interest income | $ 161 | $ 143 | $ 94
Change in value of investments accounted at fair value | 509 | 0 | 38
Change in value of warrant liabilities | 784 | 420 | 590
Change in value of convertible debentures | (940) | (407) | (1,548)
Gain on settlement of loans and borrowings | 0 | 424 | 0
Insurance settlement | 0 | 223 | 0
Sales and property tax refunds | 0 | 176 | 0
Gain on sale of mineral properties | 0 | 316 | 0
Gain (Loss) on Disposition of Property Plant Equipment | 1,913 | 0 | 0
Other | 142 | (96) | 406
Other income (expense) | $ 2,569 | $ 1,199 | $ (420)

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 + Details
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