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CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating expenses:        
Research and development $ 1,420 $ 2,831 $ 4,403 $ 4,615
General and administrative 1,924 2,289 4,167 4,431
Total operating expenses 3,344 5,120 8,570 9,046
Loss from operations (1,490) (5,120) (6,210) (9,046)
Other income (expense):        
Interest income 120 19 171 26
Interest expense (112) (181) (246) (379)
Loss on disposal of property and equipment     (2)
Change in fair value of liability instruments       1
Total other income (expense) 8 (162) (77) (352)
Net loss $ (1,482) $ (5,282) $ (6,287) $ (9,398)
Net loss per share, basic $ (0.59) $ (3.56) $ (2.60) $ (6.43)
Net loss per share, diluted $ (0.59) $ (3.56) $ (2.60) $ (6.43)
Basic weighted average shares used in calculating net loss per share attributable to common stockholders 2,509,378 1,483,655 2,415,221 1,461,330
Diluted weighted average shares used in calculating net loss per share attributable to common stockholders 2,509,378 1,483,655 2,415,221 1,461,330
Government Contracts and Other [Member]        
Revenue $ 1,854   $ 2,360