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CONDENSED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating expenses:    
Research and development $ 2,983 $ 1,785
General and administrative 2,243 2,141
Total operating expenses 5,226 3,926
Operating loss (4,720) (3,926)
Other income (expense):    
Interest income 51 7
Interest expense (134) (198)
Change in fair value of liability instruments   1
Loss on disposal of property and equipment (2) 0
Total other expense (85) (190)
Net loss $ (4,805) $ (4,116)
Net loss per share, basic $ (0.14) $ (0.19)
Net loss per share, diluted $ (0.14) $ (0.19)
Basic weighted average shares used in calculating net loss per share attributable to common stockholders 34,800,260 21,507,061
Diluted weighted average shares used in calculating net loss per share attributable to common stockholders 34,800,260 21,507,061
Grant [Member]    
Revenue $ 506