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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Operating expenses:        
Research and development $ 16,537 $ 15,480 $ 50,520 $ 42,737
General and administrative 3,579 2,907 11,641 9,957
4SC Royalty Settlement (see Note 4) 0 0 0 17,250
Total operating expenses 20,116 18,387 62,161 69,944
Loss from operations (20,116) (18,387) (62,161) (69,944)
Other income (expense):        
Interest income 230 10 343 51
Other income (expense), net (1,338) (915) (2,115) (1,867)
Total other expense (1,108) (905) (1,772) (1,816)
Net loss $ (21,224) $ (19,292) $ (63,933) $ (71,760)
Net loss per share, basic (in dollars per share) $ (0.69) $ (0.76) $ (2.16) $ (3.33)
Net loss per share, diluted (in dollars per share) $ (0.69) $ (0.76) $ (2.16) $ (3.33)
Weighted-average common shares outstanding, basic (in shares) 30,564,995 25,320,091 29,655,946 21,559,964
Weighted-average common shares outstanding, diluted (in shares) 30,564,995 25,320,091 29,655,946 21,559,964