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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
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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