Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenue	$ 0	$ 0	$ 0	$ 1,580
Operating expenses:
Research and development	(47,754)	(32,339)	(130,517)	(94,614)
General and administrative	(14,260)	(15,346)	(44,528)	(44,074)
Total operating expenses	(62,014)	(47,685)	(175,045)	(138,688)
Loss from operations	(62,014)	(47,685)	(175,045)	(137,108)
Interest and other income (expense), net	5,128	6,515	16,663	17,827
Interest expense	(877)	(317)	(2,190)	(946)
Net loss	$ (57,763)	$ (41,487)	$ (160,572)	$ (120,227)
Earnings Per Share [Abstract]
Basic (USD per share)	$ (0.95)	$ (0.70)	$ (2.66)	$ (2.06)
Diluted (USD per share)	$ (0.95)	$ (0.70)	$ (2.66)	$ (2.06)
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Shares used in computing net loss per share - basic (in shares)	60,730,935	59,688,451	60,432,643	58,319,608
Shares used in computing net loss per share - diluted (in shares)	60,730,935	59,688,451	60,432,643	58,319,608
Comprehensive loss:
Net loss	$ (57,763)	$ (41,487)	$ (160,572)	$ (120,227)
Net unrealized gain on short-term investments	1,465	334	503	51
Total other comprehensive gain	1,465	334	503	51
Comprehensive loss	$ (56,298)	$ (41,153)	$ (160,069)	$ (120,176)