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CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating expenses:        
Research and development $ 2,493 $ 2,945 $ 6,896 $ 7,560
General and administrative 1,998 2,222 6,165 6,653
Total operating expenses 4,491 5,167 13,061 14,213
Loss from operations (3,251) (5,094) (9,461) (14,140)
Other income (expense):        
Interest income 119 48 290 74
Interest expense (87) (173) (333) (552)
Loss on disposal of property and equipment     (2)  
Change in fair value of liability instruments       1
Total other income (expense) 32 (125) (45) (477)
Net loss $ (3,219) $ (5,219) $ (9,506) $ (14,617)
Net loss per share, basic $ (1) $ (2.85) $ (3.54) $ (9.22)
Net loss per share, diluted $ (1) $ (2.85) $ (3.54) $ (9.22)
Basic weighted average shares used in calculating net loss per share attributable to common stockholders 3,225,351 1,829,444 2,688,232 1,585,946
Diluted weighted average shares used in calculating net loss per share attributable to common stockholders 3,225,351 1,829,444 2,688,232 1,585,946
Grant [Member]        
Revenue $ 1,240 $ 73 $ 3,600 $ 73