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Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Statement [Abstract]        
Revenue $ 0 $ 248 $ 0 $ 1,580
Operating expenses:        
Research and development (45,617) (33,002) (82,763) (62,275)
General and administrative (15,022) (14,574) (30,268) (28,728)
Total operating expenses (60,639) (47,576) (113,031) (91,003)
Loss from operations (60,639) (47,328) (113,031) (89,423)
Interest and other income (expense), net 5,653 6,455 11,535 11,313
Interest expense (868) (319) (1,313) (630)
Net loss $ (55,854) $ (41,192) $ (102,809) $ (78,740)
Earnings Per Share [Abstract]        
Basic (USD per share) $ (0.92) $ (0.70) $ (1.71) $ (1.37)
Diluted (USD per share) $ (0.92) $ (0.70)    
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Shares used in computing net loss per share - basic (in shares) 60,382,796 59,172,869 60,281,859 57,623,842
Shares used in computing net loss per share - diluted (in shares) 60,382,796 59,172,869 60,281,859 57,623,842
Comprehensive loss:        
Net loss $ (55,854) $ (41,192) $ (102,809) $ (78,740)
Net unrealized loss on short-term investments (128) (910) (962) (283)
Total other comprehensive loss (128) (910) (962) (283)
Comprehensive loss $ (55,982) $ (42,102) $ (103,771) $ (79,023)