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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Licensing revenue $ 125,000 $ 125,000 $ 250,000 $ 250,000
Operating expenses:        
Research and development 2,593,412 2,990,861 5,164,985 6,042,910
General and administrative 2,602,990 1,901,136 5,539,761 3,740,042
Total operating expenses 5,196,402 4,891,997 10,704,746 9,782,952
Loss from operations (5,071,402) (4,766,997) (10,454,746) (9,532,952)
Other (expense) income:        
Gain (loss) from change in valuation of earn-out milestone liability 81,000 (256,296) (70,000) (297,570)
Investment income (349) 20,960 2,062 109,269
Interest expense (221,227) (340,602) (378,841) (679,967)
Recognized loss on extinguishment of debt (234,419) (234,419)
Other (expense) income (2,000) (1,456) 1,407
Total other (expense) income, net (376,995) (575,938) (682,654) (866,861)
Net loss $ (5,448,397) $ (5,342,935) $ (11,137,400) $ (10,399,813)
Basic and diluted $ (0.06) $ (0.18) $ (0.15) $ (0.37)
Basic and diluted 85,923,755 29,887,329 76,165,451 27,830,573