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Organization, Description of the Business and Liquidity (Details) - USD ($)
$ in Thousands
Mar. 28, 2018
Dec. 31, 2017
Feb. 17, 2017
Dec. 31, 2016
Aug. 29, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]              
Equity ownership percentage         51.20%    
Accumulated deficit   $ (54,677)   $ (35,302)      
Cash and cash equivalents   7,600   10,174   $ 7,996 $ 257
BioTime shares held as available-for-sale securities, at fair value   760   $ 2,237      
Subsequent Event [Member]              
Schedule of Equity Method Investments [Line Items]              
Gross proceeds from private placement $ 10,000            
Subsequent Event [Member] | Investor One [Member]              
Schedule of Equity Method Investments [Line Items]              
Gross proceeds from private placement 8,000            
Subsequent Event [Member] | Investor Two [Member]              
Schedule of Equity Method Investments [Line Items]              
Gross proceeds from private placement $ 2,000            
BioTime, Inc. [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity ownership percentage     50.00% 51.10%      
BioTime shares held as available-for-sale securities, at fair value   $ 800