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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
Technology development and licensing revenue $ 500,000 $ 500,000
Operating expenses:    
Research and development 11,344,819 13,065,309
General and administrative 7,641,593 8,000,164
Total operating expenses 18,986,412 21,065,473
Loss from operations (18,486,412) (20,565,473)
Other income (expense):    
(Loss) gain from change in earn-out milestone liability (1,300,291) 3,189,955
Fair value of warrants issued in connection with amendment to modify GEN-1 earn-out milestone payments (400,000)
Impairment of in-process research and development (2,370,257)
Investment income, net 119,907 500,882
Interest expense (1,292,338) (1,393,400)
Other income 7 29
Total other (expense) income (4,842,972) 1,897,466
Loss before income tax benefit (23,329,384) (18,668,007)
Income tax benefit 1,845,823 1,816,474
Net loss $ (21,483,561) $ (16,851,533)
Net loss per common share - basic and diluted $ (0.67) $ (0.77)
Weighted average common shares outstanding - basic and diluted 31,961,248 21,832,932