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SUPPLEMENTAL FINANCIAL INFORMATION (Tables) | 6 Months Ended
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Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Other Nonoperating Income (Expense) | The components of other income (expense) are as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
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 |  |  | — |  |  | 341 |  |  | — |
Other | 48 |  |  | (2 | ) |  | 75 |  |  | (160 | )
Other income | $ | 499 |  |  | $ | 3,680 |  |  | $ | 562 |  |  | $ | 1,763 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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