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SUPPLEMENTAL FINANCIAL INFORMATION | 3 Months Ended
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Mar. 31, 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 March 31,
|  |  |  |  | 2021 |  | 2020
Interest income |  |  |  |  | $ | 11 |  |  | $ | 72 |
Change in value of investments accounted for at fair value |  |  |  |  | 1,456 |  |  | (391) |
Change in value of warrant liabilities |  |  |  |  | (3,504) |  |  | 1,146 |
Change in value of Convertible Debentures |  |  |  |  | — |  |  | 465 |
Foreign exchange gain (loss) |  |  |  |  | (339) |  |  | 1,236 |
Other |  |  |  |  | 329 |  |  | (36) |
Other income (loss) |  |  |  |  | $ | (2,047) |  |  | $ | 2,492 |

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