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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating expenses:        
Research and development $ 16,538 $ 15,738 $ 33,983 $ 27,257
General and administrative 4,072 3,432 8,062 7,050
4SC royalty settlement (see Note 4) 0 0 0 17,250
Total operating expenses 20,610 19,170 42,045 51,557
Loss from operations (20,610) (19,170) (42,045) (51,557)
Other income (expense):        
Interest income 106 13 113 41
Other income (expense), net (1,397) 1,223 (777) (952)
Total other income (expense) (1,291) 1,236 (664) (911)
Net loss $ (21,901) $ (17,934) $ (42,709) $ (52,468)
Net loss per share, basic (in USD per share) $ (0.72) $ (0.82) $ (1.49) $ (2.44)
Net loss per share, diluted (in USD per share) $ (0.72) $ (0.82) $ (1.49) $ (2.44)
Weighted-average common shares outstanding, basic (in shares) 30,248,767 21,749,439 28,686,910 21,463,656
Weighted-average common shares outstanding, diluted (in shares) 30,248,767 21,749,439 28,686,910 21,463,656