CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue from contract with customer, product and service	us-gaap:GrantMember	us-gaap:GrantMember	us-gaap:GrantMember	us-gaap:GrantMember
Grant revenue	$ 571,387	$ 1,243,310	$ 1,840,216	$ 2,376,140
Operating expenses:
Research and development	2,096,302	1,443,322	3,836,957	3,086,693
General and administrative	1,591,905	1,700,942	2,924,674	3,559,959
Total operating expenses	3,688,207	3,144,264	6,761,631	6,646,652
Loss before other income (expense)	(3,116,820)	(1,900,954)	(4,921,415)	(4,270,512)
Change in fair value of warrant liability	42,186	(62,635)	(3,868)	220,435
Government grants and other income	0	179,027	0	179,027
Interest income (expense), net	265	304	(982)	2,976
Loss from continuing operations	(3,074,369)	(1,784,258)	(4,926,265)	(3,868,074)
Net loss	$ (3,074,369)	$ (1,784,258)	$ (4,926,265)	$ (3,868,074)
Earnings Per Share, Diluted( In dollar per share)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.33)
Earnings Per Share, Basic( In dollar per share)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.33)
Weighted Average Number of Shares Outstanding, Diluted( In dollar per share)	44,756,201	13,951,283	37,654,521	11,743,062
Weighted Average Number of Shares Outstanding, Basic( In dollar per share)	44,756,201	13,951,283	37,654,521	11,743,062