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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, 2020 | Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Interest income | $ 72 | $ 111
Change in value of investments accounted for at fair value | (391) | 375
Change in value of warrant liabilities | 1,146 | (732)
Change in value of Convertible Debentures | 465 | (1,436)
Foreign exchange gain | 1,236 | 0
Other | (36) | (1)
Other income (loss) | $ 2,492 | $ (1,683)

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