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SUPPLEMENTAL FINANCIAL INFORMATION | 6 Months Ended
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Jun. 30, 2021
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest income | $ | 14 |  |  | $ | 56 |  |  | $ | 25 |  |  | $ | 128 |
Change in value of investments accounted for at fair value | (435) |  |  | 527 |  |  | 1,021 |  |  | 136 |
Change in value of warrant liabilities | (3,546) |  |  | (1,238) |  |  | (7,050) |  |  | (92) |
Change in value of Convertible Debentures | — |  |  | (465) |  |  | — |  |  | — |
Foreign exchange gain (loss) | 659 |  |  | (255) |  |  | 320 |  |  | 981 |
Other | 873 |  |  | — |  |  | 1,202 |  |  | (36) |
Other income (loss) | $ | (2,435) |  |  | $ | (1,375) |  |  | $ | (4,482) |  |  | $ | 1,117 |

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