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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Interest income | $ 24 | $ 32 | $ 74 | $ 61
Change in value of investments accounted at fair value | 667 | 119 | 443 | 618
Change in value of warrant liabilities | (1,445) | 3,038 | (1,081) | 845
Change in value of convertible debentures | 465 | 147 | 320 | (775)
Sale of surplus assets | 265 | 345 | 279 | 1,138
Foreign exchange gain (loss) | 134 | 1 | 111 | 36
Gain on sale of assets held for sale | 341 | 0 | 341 | 0
Other | 48 | (2) | 75 | (160)
Other income | $ 499 | $ 3,680 | $ 562 | $ 1,763

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