Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	[1]	Dec. 31, 2016	[2]
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets	$ 23,294		$ 25,703
Accumulated amortization	(16,394)		(15,497)
Intangible assets, net	$ 6,900		$ 10,206

[1] Reflects the effect of the OncoCyte Deconsolidation.

[2] Reflects the effect of the Asterias Deconsolidation