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Related Party Transactions - Corporate Officers’ Family Members (Details) - USD ($)
12 Months Ended
Sep. 11, 2018
Dec. 31, 2018
Dec. 31, 2017
Commercialization Agreement      
Net cash proceeds   $ 2,564,938 $ 1,100,000
Convertible debt, Gross   $ 11,294,770 $ 13,916,478
Warrants to purchase (in shares)   759,396 1,036,717
Note purchase agreement | September 2018 Conte convertible note payable      
Commercialization Agreement      
Net cash proceeds $ 100,000    
Convertible debt, Gross 111,250    
Discount $ 11,250    
Class of Warrant or Right Term 5 years    
Warrants to purchase (in shares) 33,918    
Dr. A. Conte | Note purchase agreement | September 2018 Conte convertible note payable      
Commercialization Agreement      
Net cash proceeds $ 100,000    
Convertible debt, Gross 111,250    
Discount $ 11,250    
Class of Warrant or Right Term 5 years    
Warrants to purchase (in shares) 33,918    
Exercise price (in dollars per share) $ 1.23