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Subsequent Events (Details) - USD ($)
1 Months Ended
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 27, 2018
Dec. 31, 2017
Number of common shares   36,933,217 30,087,213    
Value of common stock   $ 3,693 $ 3,009    
Share Price       $ 3.00 $ 5.325
Subsequent Event          
Number of common shares 82,019        
Subsequent Event | Pfizer Inc          
Value of common stock $ 8,000,000        
Prior trading days 10 days        
Share Price $ 97.5380        
Upfront cash payment $ 3,000,000        
Future milestone payments $ 323,000,000