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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
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 | 0 | 153 | 0 | 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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