Related Party Transactions (Details)				1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 17, 2017 $ / shares shares	Aug. 17, 2017 $ / shares shares	Jul. 10, 2017 USD ($) $ / shares shares	Feb. 28, 2017 $ / shares shares	Sep. 30, 2017 USD ($) ft² $ / shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) ft² $ / shares shares	Sep. 30, 2016 USD ($)	Jun. 30, 2017 $ / shares	Feb. 17, 2017 $ / shares	Dec. 31, 2016 USD ($) $ / shares
Related Party Transaction [Line Items]
Carrying value of convertible notes					$ 0		$ 0				$ 1,032,000
Common stock issued to unaffiliated and existing investors (in shares) | shares		300,000
Common stock price per share issued to unaffiliated and existing investors (in dollars per share) | $ / shares		$ 2.81
Loss on debt extinguishment					$ (2,799,000)	$ 0	(2,799,000)	$ 0
Rent per month							$ 5,050
Area of office space (in square feet) | ft²					900		900
Common Stock [Member]
Related Party Transaction [Line Items]
Common shares issued (in shares) | shares	11,057,693			7,453,704
Price per share on NYSE MKT (in dollars per share) | $ / shares			$ 3.09
Stock price per share (in dollars per share) | $ / shares	$ 2.60			$ 2.70
OncoCyte [Member]
Related Party Transaction [Line Items]
Price per share on NYSE MKT (in dollars per share) | $ / shares					$ 7.55		$ 7.55		$ 5.20	$ 4.85
Markup rate on allocated costs							5.00%
Interest rate charged on unpaid and overdue invoices							15.00%
Receivables from related party					$ 2,100,000		$ 2,100,000
OncoCyte [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Term of payment							30 days
Asterias Biotherapeutics [Member]
Related Party Transaction [Line Items]
Price per share on NYSE MKT (in dollars per share) | $ / shares					$ 3.40		$ 3.40		$ 3.55		$ 4.60
Receivables from related party											$ 300,000
Net payables to related party					$ 100,000		$ 100,000
Ascendance Biotechnology, Inc [Member]
Related Party Transaction [Line Items]
Receivables from related party					$ 300,000		$ 300,000
Hadasit Bio-Holdings, Ltd [Member]
Related Party Transaction [Line Items]
Ownership percentage, noncontrolling owners			21.20%
AgeX Therapeutics, Inc [Member]
Related Party Transaction [Line Items]
Common shares issued (in shares) | shares		4,950,000
Alfred D. Kingsley [Member]
Related Party Transaction [Line Items]
Common stock shares converted (in shares) | shares		300,000
Common stock shares converted price per share (in dollars per shares) | $ / shares		$ 2.81
Alfred D. Kingsley [Member] | AgeX Therapeutics, Inc [Member]
Related Party Transaction [Line Items]
Common shares issued (in shares) | shares							200,000
Stock price per share (in dollars per share) | $ / shares		$ 2.00
Additional common shares purchased (in shares) | shares		421,500
Additional common stock shares purchased price per share (in dollars per share) | $ / shares		$ 2.00
Cell Cure Neurosciences, Ltd. [Member]
Related Party Transaction [Line Items]
Carrying value of convertible notes											1,865,000
Amount of accrued interest											2,544,000
Unamortized debt discount											$ 679,000
Cell Cure Neurosciences, Ltd. [Member] | Convertible Notes Payable [Member]
Related Party Transaction [Line Items]
Stated interest rate					3.00%		3.00%
Conversion price (in dollars per share) | $ / shares					$ 20.00		$ 20.00
Accrued interest is payable period							3 years
Cell Cure Neurosciences, Ltd. [Member] | Convertible Notes Payable [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Estimated fair market value (in dollars per share) | $ / shares							$ 28.00
Intrinsic value (in dollars per share) | $ / shares							$ 8
Effective annual interest rate					11.00%		11.00%
Cell Cure Neurosciences, Ltd. [Member] | Convertible Notes Payable [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Estimated fair market value (in dollars per share) | $ / shares							$ 40.00
Intrinsic value (in dollars per share) | $ / shares							$ 20
Effective annual interest rate					23.00%		23.00%
Cell Cure Neurosciences, Ltd. [Member] | Hadasit Bio-Holdings, Ltd [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Common shares issued (in shares) | shares			1,220,207
Common shares issued value			$ 3,800,000
Cell Cure Neurosciences, Ltd. [Member] | Hadasit Bio-Holdings, Ltd [Member] | Convertible Notes Payable [Member]
Related Party Transaction [Line Items]
Intrinsic value of equity							$ 3,100,000
Loss on debt extinguishment					$ 2,800,000		$ 2,800,000
Cell Cure Neurosciences, Ltd. [Member] | Hadasit Bio-Holdings, Ltd [Member] | Convertible Notes Payable [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Common shares issued (in shares) | shares			2,776,662
Common shares issued value			$ 8,600,000