6. Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss on sale of investment	$ (9,230)	$ (19,095)
Change in fair value of investment	9,899	(59,103)
Net realized and unrealized gain (loss) on investment	669	(78,198)
Investments - Warrants [Member]
Change in fair value of investment	(1,308)	(11,895)
Investments - Common Stock [Member]
Loss on sale of investment	(9,230)	(19,095)
Change in fair value of investment	$ 11,207	$ (47,208)