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
Income Statement [Abstract]
Grant revenue	$ 1,243,310	$ 895,778	$ 2,376,140	$ 1,551,413
Operating expenses:
Research and development	1,443,322	840,144	3,086,693	1,540,073
General and administrative	1,700,942	967,736	3,559,959	2,456,226
Total operating expenses	3,144,264	1,807,880	6,646,652	3,996,299
Loss before other income (expense)	(1,900,954)	(912,102)	(4,270,512)	(2,444,886)
Change in fair value of warrant liability	(62,635)	0	220,435	0
Government grants and other income	179,027	0	179,027	0
Interest income, net	304	8,457	2,976	19,165
Net loss	$ (1,784,258)	$ (903,645)	$ (3,868,074)	$ (2,425,721)
Loss per common share - basic and diluted (usd per share)	$ (0.13)	$ (0.30)	$ (0.33)	$ (0.90)
Weighted-average number of common shares outstanding — basic and diluted	13,951,283	3,015,807	11,743,062	2,696,149