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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Licensing revenue $ 125,000 $ 125,000 $ 375,000 $ 375,000
Operating expenses:        
Research and development 2,468,066 2,491,696 7,633,051 8,534,606
General and administrative 2,718,510 1,792,904 8,258,271 5,532,946
Total operating expenses 5,186,576 4,284,600 15,891,322 14,067,552
Loss from operations (5,061,576) (4,159,600) (15,516,322) (13,692,552)
Other (expense) income:        
Loss from change in fair-value of earn-out milestone liability (257,000) (1,099,721) (327,000) (1,397,291)
Impairment of in-process research and development (2,370,257) (2,370,257)
Investment income 3,552 10,114 5,614 119,383
Interest expense (95,520) (450,732) (474,361) (1,130,699)
Recognized loss on extinguishment of debt (234,419)
Other (expense) income (1,400) (1,456) 7
Total other (expense) income, net (348,968) (3,911,996) (1,031,622) (4,778,857)
Net loss $ (5,410,544) $ (8,071,596) $ (16,547,944) $ (18,471,409)
Net loss per common share        
Basic and diluted $ (0.06) $ (0.24) $ (0.21) $ (0.62)
Weighted average shares outstanding        
Basic and diluted 86,557,736 34,112,254 79,667,613 29,934,764