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SUPPLEMENTAL FINANCIAL INFORMATION | 9 Months Ended
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Sep. 30, 2020
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
Interest income | $ | (4) |  |  | $ | 134 |  |  | $ | 124 |  |  | $ | 386 |
Change in value of investments accounted for at fair value | 258 |  |  | (589) |  |  | 394 |  |  | (576) |
Change in value of warrant liabilities | 307 |  |  | 2,166 |  |  | 215 |  |  | 3,281 |
Change in value of Convertible Debentures | 153 |  |  | 940 |  |  | 153 |  |  | 447 |
Foreign exchange gain (loss) | (105) |  |  | (15) |  |  | 876 |  |  | (34) |
Other | 19 |  |  | (324) |  |  | (17) |  |  | (323) |
Other income | $ | 628 |  |  | $ | 2,312 |  |  | $ | 1,745 |  |  | $ | 3,181 |

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