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5. INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Investment Holdings [Line Items] |  |  |  |
Change in fair value of investment | $ (3,081) | $ (4,266) | $ 3,704 | $ 9,622
Loss on sale of investment |  |  | (2,762) | (8,147)
Net realized and unrealized gain (loss) on investment | (3,081) | (5,181) | 942 | 1,475
Warrant Investment [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Change in fair value of investment | (3,081) | (3,216) | 225 | (822)
Gain on sale of investment | 0 | 0 | 554 | 0
Common Stock Investment [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Change in fair value of investment | 0 | (1,050) | 3,479 | 10,444
Loss on sale of investment | $ 0 | $ (915) | $ (3,316) | $ (8,147)

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