Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Condensed Consolidated Statements of Operations
Grant revenue	$ 980,000	$ 1,883,000	$ 1,776,000	$ 3,119,000
Operating expenses
Research and development	8,259,000	9,020,000	17,863,000	17,048,000
General and administrative	2,350,000	2,083,000	4,888,000	4,066,000
Total operating expenses	10,609,000	11,103,000	22,751,000	21,114,000
Loss from operations	(9,629,000)	(9,220,000)	(20,975,000)	(17,995,000)
Other income (expense)
Interest income	46,000	5,000	64,000	6,000
Change in fair value of convertible debt	6,036,000		2,874,000
Total other income (expense), net	6,082,000	5,000	2,938,000	6,000
Net loss	$ (3,547,000)	$ (9,215,000)	$ (18,037,000)	$ (17,989,000)
Net Loss per Share
Net loss per share, basic	$ (0.10)	$ (0.26)	$ (0.50)	$ (0.55)
Weighted average shares outstanding, basic	36,068,130	35,999,642	36,056,649	32,517,416
Net loss per share, diluted	$ (0.17)	$ (0.26)	$ (0.50)	$ (0.55)
Weighted average shares outstanding, diluted	56,544,698	35,999,642	36,056,649	32,517,416