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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Technology development and licensing revenue $ 125,000 $ 125,000
Operating expenses:    
Research and development 3,052,049 2,767,659
General and administrative 1,838,906 2,217,864
Total operating expenses 4,890,995 4,985,523
Loss from operations (4,765,955) (4,860,523)
Other income (expense):    
(Loss) gain from change in valuation of earn-out milestone liability (41,274) 3,130,000
Fair value of warrants issued in connection with amendment to modify GEN-1 earn-out milestone payments (400,000)
Investment income 88,309 113,791
Interest expense (339,365) (350,747)
Other income 1,407 27
Total other income (expense), net (290,923) 2,493,071
Net loss $ (5,056,878) $ (2,367,452)
Net loss per common share - Basic and diluted $ (0.20) $ (0.12)
Weighted average common shares outstanding - Basic and diluted 25,804,349 19,104,785