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Consolidated 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 $ 4,229 $ 4,094 $ 7,821 $ 7,121
General and administrative 2,556 1,144 4,091 2,420
Loss from operations 6,785 5,238 11,912 9,541
Other income (expense):        
Interest expense (276) 0 (507) 0
Interest income and other income (expense), net 3 9 6 84
Net loss $ (7,058) $ (5,229) $ (12,413) $ (9,457)
Net loss per share of common stock, basic and diluted (in USD per share) $ (7.63) $ (11.42) $ (17.30) $ (21.28)
Weighted-average shares of common stock outstanding, basic and diluted (in shares) 925,432 457,998 717,618 444,466