Income Taxes - Schedule of Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed tax benefit at federal statutory rate	21.00%	34.00%
Research and development and other credits	1.00%	2.00%
Re-rate of federal net deferred tax assets	0.00%	(38.00%)
Permanent differences	(3.00%)	(8.00%)
Change in valuation allowance	4.00%	(32.00%)
Establish deferred tax liability for AgeX/OncoCyte shares at deconsolidation	8.00%	17.00%
Deconsolidation of AgeX and subsidiaries net deferred tax assets	(28.00%)	0.00%
State tax benefit, net of effect on federal income taxes	0.00%	27.00%
Foreign rate differential	(2.00%)	(2.00%)
Income tax benefit	1.00%	0.00%

Deconsolidation of AgeX and subsidiaries net deferred tax assets.

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Establish deferred tax liability.

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Effective Income Tax Rate Reconciliation Permanent Differences

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Re-rate of federal net deferred tax assets.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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