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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 18, 2015
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Segment
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Feb. 17, 2017
Aug. 29, 2016
Schedule of Equity Method Investments [Line Items]              
Equity ownership percentage             51.20%
Reverse Stock Split [Abstract]              
Reverse stock split ratio 0.5            
Cash and Cash Equivalents [Abstract]              
Cash     $ 7,600 $ 10,200      
Subsidiary, Sale of Stock [Line Items]              
Proceeds from sale of common stock     0 0 $ 11,649    
Realized loss on sale of BioTime shares     0 0 $ 397    
Shares held as available-for-sale securities, at fair value     $ 760 2,237      
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, useful life     10 years        
Impairment of long-lived assets [Abstract]              
Impairment losses     $ 0        
Income Tax Disclosure [Line Items]              
Accrued interest and penalties     $ 0 $ 0      
Federal corporate tax rate     34.00% 34.00% 34.00%    
Computations of Basic and Diluted Net Loss Per Common Share [Abstract]              
Net loss     $ (19,375) $ (11,168) $ (8,735)    
Weighted average shares outstanding - basic and diluted (in shares) | shares     30,195,000 26,529,000 21,009,000    
Net loss per common share - basic and diluted (in dollars per share) | $ / shares     $ (0.64) $ (0.42) $ (0.42)    
Segments [Abstract]              
Number of operating segments | Segment     1        
Plan [Member]              
Income Tax Disclosure [Line Items]              
Federal corporate tax rate   21.00%          
Equipment and Furniture [Member] | Minimum [Member]              
Property, Plant and Equipment [Line Items]              
Equipment and furniture, useful life     3 years        
Equipment and Furniture [Member] | Maximum [Member]              
Property, Plant and Equipment [Line Items]              
Equipment and furniture, useful life     10 years        
Equipment [Member] | Minimum [Member]              
Property, Plant and Equipment [Line Items]              
Equipment and furniture, useful life     3 years        
Equipment [Member] | Maximum [Member]              
Property, Plant and Equipment [Line Items]              
Equipment and furniture, useful life     5 years        
BioTime, Inc. [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity ownership percentage       51.10%   50.00%  
Subsidiary, Sale of Stock [Line Items]              
Number of shares sold (in shares) | shares     266,442 0 259,712    
Proceeds from sale of common stock     $ 934   $ 815    
Realized loss on sale of BioTime shares     $ (309)   $ (397)    
Shares held as available-for-sale securities (in shares) | shares     353,264        
Shares held as available-for-sale securities, at fair value     $ 800        
Long-lived Intangible Assets [Member]              
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, useful life     10 years        
Stock Options [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Antidilutive securities excluded from computation of earnings per share (in shares) | shares     3,390,000 3,017,000 2,240,000    
Warrants [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Antidilutive securities excluded from computation of earnings per share (in shares) | shares     2,779,000 3,246,000 0