6. Investments at Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net realized and unrealized gain (loss) on investment	$ 13,661	$ 669
Veritone Warrants [Member]
Change in fair value of investment	1,996	(1,308)
Gain on sale of investment	11,503	0
Veritone Common Stock [Member]
Change in fair value of investment	3,478	11,207
Loss on sale of investment	$ (3,316)	$ (9,230)