Fair Value of Financial Assets and Liabilities (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Beginning balance	$ 1,020
Purchase of other investments at fair value	8,194	$ 345
Ending balance	10,345	1,020
Significant unobservable inputs (Level 3) [Member]
Beginning balance	1,020
Purchase of other investments at fair value	131
Purchase of investment in DatChat at fair value	1,000
Fair value of Hoth upon issuance		675
Change in fair value of Hoth	8,194	345
Ending balance	$ 10,345	$ 1,020