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SUPPLEMENTAL FINANCIAL INFORMATION | 6 Months Ended
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Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION 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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