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5. INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investment Holdings [Line Items] |  |  |  |
Change in fair value of investment | $ 2,677 | $ 6,980 | $ 6,785 | $ 13,888
Loss on sale of investment |  |  | (2,762) | (7,232)
Net realized and unrealized gain (loss) on investment | 3,231 | 5,338 | 4,023 | 6,656
Warrant Investment [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Change in fair value of investment | 2,677 | 3,091 | 3,306 | 2,394
Gain on sale of investment | 554 | 0 | 554 | 0
Common Stock Investment [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Change in fair value of investment | 0 | 3,889 | 3,479 | 11,494
Loss on sale of investment | $ 0 | $ (1,642) | $ (3,316) | $ (7,232)

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