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Consolidated Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Consolidated Statements of Operations [Abstract]        
Grant revenue $ 1,251,000 $ 288,000 $ 3,485,000 $ 319,000
Operating expenses        
Research and development 5,626,000 4,066,000 15,201,000 9,464,000
General and administrative 1,768,000 1,845,000 6,058,000 5,989,000
Total operating expenses 7,394,000 5,911,000 21,259,000 15,453,000
Loss from operations (6,143,000) (5,623,000) (17,774,000) (15,134,000)
Other income (expense)        
Gain upon extinguishment of Paycheck Protection Program loan 726,000   726,000  
Interest income   4,000 4,000 28,000
Interest expense (2,000) (150,000) (64,000) (451,000)
Total other income (expense), net 724,000 (146,000) 666,000 (423,000)
Net loss $ (5,419,000) $ (5,769,000) $ (17,108,000) $ (15,557,000)
Per share information:        
Net loss per share, basic and diluted (in dollars per share) $ (0.22) $ (0.31) $ (0.73) $ (0.99)
Weighted average shares outstanding, basic and diluted 24,820,233 18,394,614 23,363,113 15,740,858