Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Consolidated Statements of Operations [Abstract]
Grant revenue	$ 1,236,000	$ 1,066,000
Operating expenses
Research and development	8,028,000	4,350,000
General and administrative	1,983,000	2,151,000
Total operating expenses	10,011,000	6,501,000
Loss from operations	(8,775,000)	(5,435,000)
Other income (expense)
Interest income	1,000	2,000
Interest expense		(62,000)
Total other income (expense), net	1,000	(60,000)
Net loss	$ (8,774,000)	$ (5,495,000)
Per share information:
Net loss per share, basic	$ (0.30)	$ (0.27)
Net loss per share, diluted	$ (0.30)	$ (0.27)
Weighted average shares outstanding, basic	28,996,499	20,458,355
Weighted average shares outstanding, diluted	28,996,499	20,458,355