CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue from contract with customer, product and service	us-gaap:GrantMember	us-gaap:GrantMember
Grant revenue	$ 1,268,829	$ 1,132,830
Operating expenses:
Research and development	1,740,655	1,643,371
General and administrative	1,332,769	1,859,017
Total operating expenses	3,073,424	3,502,388
Loss before other income (expense)	(1,804,595)	(2,369,558)
Change in fair value of warrant liability	(46,054)	283,070
Interest income (expense), net	(1,247)	2,672
Loss from continuing operations	(1,851,896)	(2,083,816)
Net loss	$ (1,851,896)	$ (2,083,816)
Loss per common share - basic and diluted (usd per share)	$ (0.06)	$ (0.22)
Weighted-average number of common shares outstanding — basic and diluted	30,551,316	9,534,842