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SUPPLEMENTAL FINANCIAL INFORMATION | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest income | $ | 5 |  |  | $ | (4) |  |  | $ | 30 |  |  | $ | 124 |
Change in value of investments accounted for at fair value | 1,294 |  |  | 258 |  |  | 2,315 |  |  | 394 |
Change in value of warrant liabilities | (1,000) |  |  | 307 |  |  | (8,050) |  |  | 215 |
Change in value of Convertible Debentures | — |  |  | 153 |  |  | — |  |  | 153 |
Foreign exchange gain (loss) | (536) |  |  | (105) |  |  | (216) |  |  | 876 |
Other | 674 |  |  | 19 |  |  | 1,876 |  |  | (17) |
Other income (loss) | $ | 437 |  |  | $ | 628 |  |  | $ | (4,045) |  |  | $ | 1,745 |

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