Equity Method Accounting for Common Stock of Asterias, at Fair Value (Details Narrative) - Asterias Biotherapeutics [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 13, 2016
Common stock, outstanding				21,700,000
Fair value on investment	$ 48,900	$ 100,000		$ 65,700
Price per share on NYSE American	$ 2.25	$ 4.60		$ 3.02
Unrealized gains on equity method investment	$ (51,107)	$ 34,361