Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization		$ (3,198)	$ (3,185)
Property and equipment, net		8,918	5,835
Construction in progress			1,268
Property, plant and equipment, net, and construction in progress		8,918	5,835
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		4,424	3,842
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		2,746	3,910
Right-of-Use Assets [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	$ 4,946

[1] BioTime adopted ASC 842 on January 1, 2019. For additional information on this standard and right-of-use assets and liabilities see Notes 2 and 15.