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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - 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 $ 22,197 $ 23,590 $ 61,732 $ 49,351
General and administrative 4,844 4,622 15,155 14,151
Total operating expenses 27,041 28,212 76,887 63,502
Loss from operations (27,041) (28,212) (76,887) (63,502)
Other income (expenses), net 238 (117) (534) (332)
Net loss before tax (26,803) (28,329) (77,421) (63,834)
Income tax expense (2)   (3)  
Net loss (26,805) (28,329) (77,424) (63,834)
Other comprehensive (loss) income:        
Unrealized (loss) gain on available-for-sale securities (136) (4) (408) 5
Foreign currency translation adjustments 14 6 32 11
Total other comprehensive (loss) income (122) 2 (376) 16
Comprehensive loss $ (26,927) $ (28,327) $ (77,800) $ (63,818)
Net loss per share, basic $ (0.57) $ (1.41) $ (2.63) $ (3.18)
Net loss per share, diluted $ (0.57) $ (1.41) $ (2.63) $ (3.18)
Weighted-average shares used to compute net loss per share, basic 47,253,527 20,092,094 29,413,421 20,043,301
Weighted-average shares used to compute net loss per share, diluted 47,253,527 20,092,094 29,413,421 20,043,301