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Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating expenses:    
Research and development $ 20,962 $ 30,580
General and administrative 8,870 6,922
Total operating expenses 29,832 37,502
Loss from operations (29,832) (37,502)
Interest income 143 393
Change in fair value of preferred stock tranche obligation 2,158 72
Net loss (27,531) (37,037)
Cumulative dividends on convertible preferred stock (7,189) (7,055)
Net loss attributable to common stockholders $ (34,720) $ (44,092)
Net loss per common share—basic and diluted $ (5.25) $ (33.41)
Weighted-average number of shares outstanding used in computing net loss per common share—basic and diluted 6,618,445 1,319,912