Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating expenses:
Research and development	$ (17,938)	$ (47,754)	$ (93,572)	$ (130,517)
General and administrative	(10,331)	(14,260)	(39,224)	(44,528)
Total operating expenses	(28,269)	(62,014)	(132,796)	(175,045)
Loss from operations	(28,269)	(62,014)	(132,796)	(175,045)
Interest and other income (expense), net	2,783	5,128	9,452	16,663
Interest expense	(815)	(877)	(2,423)	(2,190)
Net loss	$ (26,301)	$ (57,763)	$ (125,767)	$ (160,572)
Net loss per share - basic (USD per share)	$ (0.43)	$ (0.95)	$ (2.05)	$ (2.66)
Net loss per share - diluted (USD per share)	$ (0.43)	$ (0.95)	$ (2.05)	$ (2.66)
Shares used in computing net loss per share - basic (in shares)	61,406,475	60,730,935	61,339,118	60,432,643
Shares used in computing net loss per share - diluted (in shares)	61,406,475	60,730,935	61,339,118	60,432,643
Comprehensive loss:
Net loss	$ (26,301)	$ (57,763)	$ (125,767)	$ (160,572)
Net unrealized gain (loss) on short-term investments	35	1,465	(287)	503
Total other comprehensive gain (loss)	35	1,465	(287)	503
Comprehensive loss	$ (26,266)	$ (56,298)	$ (126,054)	$ (160,069)