Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Operations [Abstract]
Grant revenue	$ 823,000
Operating expenses
Research and development	14,444,000	$ 9,824,000
General and administrative	7,966,000	9,265,000
Loss on sale of assets (Note 6)		663,000
Total operating expenses	22,410,000	19,752,000
Loss from operations	(21,587,000)	(19,752,000)
Other income (expense)
Interest income	28,000	96,000
Interest expense	(628,000)	(931,000)
Other income (expense)	6,000	(9,000)
Change in fair value of derivative liabilities		1,117,000
Total other income (expense), net	(594,000)	273,000
Net loss	$ (22,181,000)	$ (19,479,000)
Per share information:
Net loss per share, basic	$ (1.35)	$ (2.49)
Weighted average shares outstanding, basic	16,415,012	7,827,197
Net loss per share, diluted	$ (1.35)	$ (2.55)
Weighted average shares outstanding, diluted	16,415,012	8,009,909