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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Feb. 17, 2017
Feb. 15, 2017
Jul. 16, 2016
Jun. 16, 2016
May 13, 2016
Feb. 28, 2017
Dec. 31, 2016
Oct. 31, 2015
Sep. 30, 2015
Subsequent Event [Line Items]                  
Number of shares sold (in shares)     7,322,176            
Warrants exercise cash proceeds       $ 16.4          
Common Stock [Member]                  
Subsequent Event [Line Items]                  
Offering price (in dollars per share)               $ 3.19 $ 3.29
Minimum [Member]                  
Subsequent Event [Line Items]                  
Equity method ownership percentage             20.00%    
Asterias Biotherapeutics, Inc. [Member]                  
Subsequent Event [Line Items]                  
Warrants exercise cash proceeds         $ 16.2        
Warrants issued (in shares)         2,959,559        
Equity method ownership percentage         57.10%   48.70%    
Asterias Biotherapeutics, Inc. [Member] | Maximum [Member]                  
Subsequent Event [Line Items]                  
Equity method ownership percentage             50.00%    
Subsequent Event [Member] | Common Stock [Member]                  
Subsequent Event [Line Items]                  
Number of shares sold (in shares)   7,453,704       7,453,704      
Offering price (in dollars per share)           $ 2.70      
Proceeds from issuance initial public offering   $ 18.7       $ 18.7      
Subsequent Event [Member] | OncoCyte [Member]                  
Subsequent Event [Line Items]                  
Warrants exercised (in shares) 625,000                
Warrants exercise price (in dollars per share) $ 3.25                
Warrants exercise cash proceeds $ 2.0                
Warrants exercisable term 5 years                
Subsequent Event [Member] | OncoCyte [Member] | Investors Group 1 [Member]                  
Subsequent Event [Line Items]                  
Warrants exercise price (in dollars per share) $ 5.50                
Warrants issued (in shares) 200,000                
Subsequent Event [Member] | OncoCyte [Member] | Investors Group 2[Member]                  
Subsequent Event [Line Items]                  
Warrants exercise price (in dollars per share) $ 3.25                
Warrants issued (in shares) 212,500                
Subsequent Event [Member] | OncoCyte [Member] | Maximum [Member]                  
Subsequent Event [Line Items]                  
Equity method ownership percentage 50.00%