Schedule of Supplemental Cash Flow Information (Details) - Asterias Biotherapeutics, Inc. [Member] - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Acquired Indefinite-lived Intangible Assets [Line Items]
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	$ 13	$ 17
Issuance of common shares for merger		32,353
Assumption of liabilities		1,136
Assumptions of warrants		$ 867

The fair value of stock issued in noncash financing activities.

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