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Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating expenses:        
Research and development $ 2,064 $ 1,784 $ 3,310 $ 2,836
General and administrative 986 1,090 2,103 1,729
Total operating expenses 3,050 2,874 5,413 4,565
Loss from operations (3,050) (2,874) (5,413) (4,565)
Net loss (3,050) (2,874) (5,413) (4,565)
Net loss attributable to common stockholders (Note 11) $ (3,765) $ (3,178) $ (6,834) $ (5,129)
Net loss per share attributable to common stockholders – basic and diluted $ (1.00) $ (0.92) $ (1.82) $ (1.52)
Weighted-average number of shares used in computing net loss per common share, basic and diluted 3,764,488 3,462,182 3,764,488 3,383,774