Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Operations [Abstract]
Grant revenue	$ 5,508,000	$ 4,474,000
Operating expenses
Research and development	35,017,000	20,015,000
General and administrative	7,437,000	8,281,000
Total operating expenses	42,454,000	28,296,000
Loss from operations	(36,946,000)	(23,822,000)
Other income (expense)
Gain upon extinguishment of Paycheck Protection Program loan		726,000
Interest income	29,000	5,000
Interest expense	0	(64,000)
Total other income (expense), net	29,000	667,000
Net loss	$ (36,917,000)	$ (23,155,000)
Net Loss per Share
Net loss per share, basic	$ (1.08)	$ (0.96)
Net loss per share, diluted	$ (1.08)	$ (0.96)
Weighted average shares outstanding, basic	34,294,124	24,104,146
Weighted average shares outstanding, diluted	34,294,124	24,104,146