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Equity Method Investment (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Aug. 06, 2018
Feb. 11, 2018
Equity Method Investment        
Contributions owed to the joint venture $ 1,000,000      
Loss from equity method investment 951,000 $ 40,000    
Equity method investment 9,000 960,000    
SABC        
Equity Method Investment        
Percentage of ownership interest       49.00%
Carryover basis of license contributed 0      
JV Entity        
Equity Method Investment        
Loss from equity method investment $ 951,000 $ 40,000    
Hepalink | SABC        
Equity Method Investment        
Percentage of ownership interest     51.00%  
Minimum amount obligated to make an additional equity investment at first future financing     $ 10,800,000  
Hepalink | JV Entity        
Equity Method Investment        
Contribution obligated     $ 7,200,000 $ 1,000,000