Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (3,185)	[1]	$ (3,156)
Property and equipment, net	5,835		5,533
Construction in progress	1,268	[1]
Property, plant and equipment, net, including construction in progress	5,835	[1]	5,533
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,842	[1]	4,255
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,910	[1]	$ 4,434

[1] Reflects the effect of the AgeX Deconsolidation.