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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Licensing revenue $ 125,000 $ 125,000 $ 250,000 $ 250,000
Operating expenses:        
Research and development 2,990,861 3,558,074 6,042,910 6,325,733
General and administrative 1,901,136 2,136,684 3,740,042 4,354,548
Total operating expenses 4,891,997 5,694,758 9,782,952 10,680,281
Loss from operations (4,766,997) (5,569,758) (9,532,952) (10,430,281)
Other (expense) income:        
(Loss) gain from change in valuation of earn-out milestone liability (256,296) (127,061) (297,570) 3,002,939
Fair value of warrants issued in connection with amendment to modify GEN-1 earn-out milestone payments (400,000)
Investment income 20,960 144,602 109,269 258,393
Interest expense (340,602) (349,448) (679,967) (700,195)
Other (expense) income (2,850) 1,407 (2,823)
Total other (expense) income, net (575,938) (334,757) (866,861) 2,158,314
Net loss $ (5,342,935) $ (5,904,515) $ (10,399,813) $ (8,271,967)
Net loss per common share - Basic and diluted $ (0.18) $ (0.29) $ (0.37) $ (0.42)
Weighted average shares outstanding - Basic and diluted 29,887,329 20,605,762 27,830,573 19,713,449