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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
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 | 0 | 465
Foreign exchange gain (loss) | (339) | 1,236
Other | 329 | (36)
Other income (loss) | $ (2,047) | $ 2,492

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