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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenues:        
Total revenue $ 658,553 $ 937,092 $ 1,306,980 $ 1,397,612
Costs and expenses:        
Costs of research and development revenue 411,109 829,504 815,855 1,220,266
Research and development 1,830,798 2,209,242 3,173,660 4,017,340
General and administrative 1,714,029 1,747,614 3,369,729 3,301,621
Foreign currency exchange loss, net 20,621 17,806 10,373 46,078
Total costs and expenses 3,976,557 4,804,166 7,369,617 8,585,305
Loss from operations (3,318,004) (3,867,074) (6,062,637) (7,187,693)
Other income:        
Interest income 30,009 20,900 32,977 46,570
Other income 0 0 250,000 0
Total other income 30,009 20,900 282,977 46,570
Net loss $ (3,287,995) $ (3,846,174) $ (5,779,660) $ (7,141,123)
Basic and diluted net loss per common share (in dollars per share) $ (0.12) $ (0.14) $ (0.20) $ (0.26)
Basic and diluted weighted-average common shares outstanding (in shares) 28,264,157 27,645,366 28,257,776 27,589,627
Research and Development [Member]        
Revenues:        
Total revenue $ 614,435 $ 937,092 $ 1,148,156 $ 1,397,612
License [Member]        
Revenues:        
Total revenue $ 44,118 $ 0 $ 158,824 $ 0