Selected Balance Sheet Components - Schedule of Property and Equipment, Net, and Construction in Progress (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Equipment, furniture and fixtures		$ 381	$ 954
Right-of-use assets	[1]		726
Accumulated depreciation and amortization		(381)	(554)
Property and equipment, net			$ 1,126

[1] AgeX adopted ASC 842 on January 1, 2019. For additional information on this standard and right-of-use assets and liabilities, see Notes 2 and 8.