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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Interest income | $ 57 | $ 36 | $ 118 | $ 76
Change in value of investments accounted at fair value | (113) | 0 | 505 | 0
Change in value of warrant liabilities | 571 | 1,178 | 1,416 | 1,879
Change in value of convertible debentures | 160 | 323 | (615) | (666)
Sale of surplus assets | 0 | 0 | 1,138 | 0
Other | 14 | 333 | (110) | 814
Other income | $ 689 | $ 1,870 | $ 2,452 | $ 2,103

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