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INVESTMENT AT FAIR VALUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investment Holdings [Line Items]
Change in fair value of investment	$ 0	$ 2,677	$ 0	$ 6,785
Net realized and unrealized gain (loss) on investment	0	3,231	839	4,023
Warrant Investment [Member]
Investment Holdings [Line Items]
Change in fair value of investment	0	2,677	0	3,306
Gain on sale of investment	0	554	839	554
Common Stock Investment [Member]
Investment Holdings [Line Items]
Change in fair value of investment	0	0	0	3,479
Gain on sale of investment	$ 0
Loss on sale of investment		0	0	3,316
Loss on sale of investment		$ 0	$ 0	$ (3,316)

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