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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Grant and collaboration revenue $ 440,602 $ 209,941 $ 1,156,579 $ 574,173
Operating expenses:        
Research and development 461,421 451,227 1,270,357 1,006,945
General and administrative 427,292 412,650 929,637 922,714
Total operating expenses 888,713 863,877 2,199,994 1,929,659
Loss from operations (448,111) (653,936) (1,043,415) (1,355,486)
Other income (expense):        
Interest income 60 881 812 2,105
Interest expense (7,153) (1,093) (8,295) (2,221)
Total other income (expense) (7,093) (212) (7,483) (116)
Net loss $ (455,204) $ (654,148) $ (1,050,898) $ (1,355,602)
Basic and diluted:        
Net loss per common share (in dollars per share) $ (0.03) $ (1,994.35) $ (0.11) $ (4,706.95)
Weighted average shares outstanding (in shares) 13,823,452 328 9,255,497 288