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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]        
Revenue from contract with customer, product and service Grant [Member] Grant [Member] Grant [Member] Grant [Member]
Grant revenue $ 0 $ 1,378,239 $ 1,840,216 $ 3,754,379
Operating expenses:        
Research and development 2,015,930 1,803,682 5,852,887 4,890,375
General and administrative 1,730,730 1,333,062 4,655,404 4,893,021
Total operating expenses 3,746,660 3,136,744 10,508,291 9,783,396
Loss before other income (expense) (3,746,660) (1,758,505) (8,668,075) (6,029,017)
Change in fair value of warrant liability 9,073 45,103 5,205 265,538
Government grants and other income 0 0 0 179,027
Interest income (expense), net 487 (3,230) (495) (254)
Loss from continuing operations (3,737,100) (1,716,632) (8,663,365) (5,584,706)
Net loss $ (3,737,100) $ (1,716,632) $ (8,663,365) $ (5,584,706)
Loss per common share, basic ( in dollar per share) $ (0.08) $ (0.10) $ (0.22) $ (0.40)
Loss per common share, diluted ( in dollar per share) $ (0.08) $ (0.10) $ (0.22) $ (0.40)
Weighted average number of shares outstanding, basic (in shares) 44,804,741 17,968,664 40,064,119 13,833,410
Weighted average number of shares outstanding, diluted (in shares) 44,804,741 17,968,664 40,064,119 13,833,410