Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Condensed Consolidated Statements of Operations
Grant revenue	$ 1,225,000	$ 1,338,000	$ 3,001,000	$ 4,457,000
Operating expenses
Research and development	7,978,000	8,400,000	25,842,000	25,448,000
General and administrative	3,583,000	1,561,000	8,470,000	5,627,000
Total operating expenses	11,561,000	9,961,000	34,312,000	31,075,000
Loss from operations	(10,336,000)	(8,623,000)	(31,311,000)	(26,618,000)
Other income (expense)
Interest income	47,000	9,000	111,000	15,000
Interest expense	(1,176,000)		(1,176,000)
Change in fair value of convertible debt	(15,833,000)		(12,959,000)
Loss on convertible debt extinguishment	(3,863,000)		(3,863,000)
Total other income (expense), net	(20,825,000)	9,000	(17,887,000)	15,000
Net loss	$ (31,161,000)	$ (8,614,000)	$ (49,198,000)	$ (26,603,000)
Per share information:
Net loss per share, basic (in dollars per share)	$ (0.86)	$ (0.24)	$ (1.36)	$ (0.79)
Net loss per share, diluted (in dollars per share)	$ (0.86)	$ (0.24)	$ (1.36)	$ (0.79)
Weighted average shares outstanding, basic (in shares)	36,086,990	36,038,686	36,067,025	33,704,071
Weighted average shares outstanding, diluted (in shares)	36,086,990	36,038,686	36,067,025	33,704,071