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SUPPLEMENTAL FINANCIAL INFORMATION | 6 Months Ended
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Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of other income are as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Interest income | $ | 142 |  |  | $ | 24 |  |  | $ | 252 |  |  | $ | 74 |
Change in value of investments accounted for 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 | — |  |  | 265 |  |  | — |  |  | 279 |
Foreign exchange gain (loss) | (16 | ) |  | 134 |  |  | (19 | ) |  | 111 |
Gain on sale of assets held for sale | — |  |  | 341 |  |  | — |  |  | 341 |
Other | (1 | ) |  | 48 |  |  | 1 |  |  | 75 |
Other income | $ | 2,552 |  |  | $ | 499 |  |  | $ | 869 |  |  | $ | 562 |

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