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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Interest income | $ 142 | $ 24 | $ 252 | $ 74
Change in value of investments accounted at fair value | (362) | 667 | 13 | 443
Change in value of warrant liabilities | 1,846 | (1,445) | 1,115 | (1,081)
Change in value of convertible debentures | 943 | 465 | (493) | 320
Sale of surplus assets | 0 | 265 | 0 | 279
Foreign exchange gain (loss) | (16) | 134 | (19) | 111
Gain on sale of assets held for sale | 0 | 341 | 0 | 341
Other | (1) | 48 | 1 | 75
Other income | $ 2,552 | $ 499 | $ 869 | $ 562

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