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SUPPLEMENTAL FINANCIAL INFORMATION | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Interest income | $ | 84 |  |  | $ | 57 |  |  | $ | 157 |  |  | $ | 118 |
Change in value of investments accounted at fair value | 1,127 |  |  | (113 | ) |  | 1,570 |  |  | 505 |
Change in value of warrant liabilities | (2,722 | ) |  | 571 |  |  | (3,802 | ) |  | 1,416 |
Change in value of convertible debentures | (1,455 | ) |  | 160 |  |  | (1,135 | ) |  | (615 | )
Sale of surplus assets | — |  |  | — |  |  | 293 |  |  | 1,138 |
Foreign exchange gain (loss) | (170 | ) |  | — |  |  | (60 | ) |  | — |
Gain on sale of assets held for sale | — |  |  | — |  |  | 341 |  |  | — |
Other | (129 | ) |  | 14 |  |  | (67 | ) |  | (110 | )
Other (expense) income | $ | (3,265 | ) |  | $ | 689 |  |  | $ | (2,703 | ) |  | $ | 2,452 |

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