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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues:        
Research and development revenue $ 937,092 $ 524,271 $ 1,397,612 $ 839,643
Costs and expenses:        
Costs of research and development revenue 829,504 624,240 1,220,266 902,422
Provision for contract losses 0 74,955 0 74,955
Research and development 2,209,242 1,116,163 4,017,340 1,871,616
General and administrative 1,747,614 1,475,232 3,301,621 3,128,624
Foreign currency exchange loss (gain), net 17,806 31,690 46,078 42,557
Total costs and expenses 4,804,166 3,322,280 8,585,305 6,020,174
Loss from operations (3,867,074) (2,798,009) (7,187,693) (5,180,531)
Interest income 20,900 146,587 46,570 314,970
Net loss $ (3,846,174) $ (2,651,422) $ (7,141,123) $ (4,865,561)
Basic and diluted net loss per common share (in dollars per share) $ (0.14) $ (0.10) $ (0.26) $ (0.18)
Basic and diluted weighted-average common shares outstanding (in shares) 27,645,366 27,467,366 27,589,627 27,459,415