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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues:        
Total revenue $ 397,060 $ 879,597 $ 2,212,271 $ 2,186,577
Costs and expenses:        
Costs of research and development revenue 105,869 602,847 1,625,731 1,418,702
Research and development 716,351 743,585 2,444,469 3,917,245
General and administrative 1,282,361 1,383,433 4,164,970 4,753,162
Foreign currency exchange loss 12,600 13,205 38,143 23,578
Total costs and expenses 2,117,181 2,743,070 8,273,313 10,112,687
Loss from operations (1,720,121) (1,863,473) (6,061,042) (7,926,110)
Other income:        
Interest income 105,862 54,300 319,787 87,277
Other income 0 0 1,017,592 250,000
Total other income 105,862 54,300 1,337,379 337,277
Net loss $ (1,614,259) $ (1,809,173) $ (4,723,663) $ (7,588,833)
Basic and diluted net loss per common share (in dollars per share) $ (0.06) $ (0.06) $ (0.16) $ (0.27)
Basic and diluted weighted-average common shares outstanding (in shares) 28,811,061 28,391,894 28,794,712 28,302,332
Research and Development [Member]        
Revenues:        
Total revenue $ 352,942 $ 835,480 $ 2,079,918 $ 1,983,636
License [Member]        
Revenues:        
Total revenue $ 44,118 $ 44,117 $ 132,353 $ 202,941