Goodwill and Intangible Assets, Net - Schedule of Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Goodwill	[1]	$ 12,977
Other		10	10
Total intangible assets		66,210	19,020
Accumulated amortization		(16,889)	(15,895)
Intangible assets, net		49,321	3,125
IPR&D - OPC1 [Member]
Total intangible assets	[2]	31,700
IPR&D - VAC2 [Member]
Total intangible assets	[2]	14,840
Patents [Member]
Total intangible assets		19,010	19,010
Royalty Contracts [Member]
Total intangible assets	[2]	$ 650

[1] Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired and liabilities assumed in the Asterias Merger (see Note 3).

[2] See Note 3 for information on the Asterias Merger which was consummated on March 8, 2019.