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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Aug. 29, 2016
Jul. 05, 2016
Jun. 16, 2016
May 13, 2016
Sep. 30, 2016
Dec. 31, 2015
Preferred Shares [Abstract]            
Preferred shares, shares authorized (in shares)         2,000,000 2,000,000
Preferred shares, shares issued (in shares)         0 0
Preferred shares, shares outstanding (in shares)         0 0
Common Shares [Abstract]            
Common stock, authorized (in shares)         150,000,000 150,000,000
Common stock, par value (in dollars per share)         $ 0 $ 0
Common shares, shares issued (in shares)         103,392,000 94,894,000
Common shares, shares outstanding (in shares)         102,772,000 90,421,000
Treasury stock (in shares)         620,000 4,473,000
Over-Allotment Option [Member]            
Common Shares [Abstract]            
Common shares, new shares issued (in shares)   1,098,326        
Proceeds from sale of stock   $ 2.2        
OncoCyte Offering [Member]            
Common Shares [Abstract]            
Issuance of common stock and warrants (in dollars per share) $ 3.25          
OncoCyte Offering Warrants [Member]            
Common Shares [Abstract]            
Warrants to purchase stock (in shares) 1          
Warrants exercised period         5 years  
Asterias Biotherapeutics [Member]            
Common Shares [Abstract]            
Common shares, shares outstanding (in shares)       3,852,880 21,700,000  
Proceeds from sale of stock       $ 16.2    
Percentage of ownership interest       57.10% 49.00%  
Oppenheimer & Co. Inc [Member]            
Common Shares [Abstract]            
Common shares, shares issued (in shares)     7,322,176      
Purchase price per share (in dollars per share)     $ 2.39      
Proceeds from sale of stock     $ 16.4      
OncoCyte Corporation [Member]            
Common Shares [Abstract]            
Proceeds from sale of stock $ 9.8          
Issuance of common stock and warrants (in shares) 3,246,153          
Warrants to purchase common stock (in shares) 1          
Percentage of ownership interest 51.20%