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5. INVESTMENT AT FAIR VALUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investment Holdings [Line Items]
Change in fair value of investment	$ 0	$ 4,108
Net realized and unrealized gain (loss) on investment	839	792
Warrant Investment [Member]
Investment Holdings [Line Items]
Change in fair value of investment	0	630
Gain on sale of investment	839	0
Common Stock Investment [Member]
Investment Holdings [Line Items]
Change in fair value of investment	0	3,478
Loss on sale of investment	$ 0	$ (3,316)

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Amount of realized and unrealized gain (loss) on investment.

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