Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue
Total revenue	$ 15,288		$ 29,396
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Collaboration Revenue [Member]		Collaboration Revenue [Member]
Operating Expenses
Research and development	$ 62,785	$ 39,727	$ 118,758	$ 75,995
General and administrative	25,169	16,677	48,004	34,861
Total operating expenses	87,954	56,404	166,762	110,856
Loss from operations	(72,666)	(56,404)	(137,366)	(110,856)
Other Income (Expense)
Interest and other income	6,935	5,973	14,814	11,298
Interest expense	(391)	(406)	(773)	(804)
Total other income, net	6,544	5,567	14,041	10,494
Loss before income taxes	(66,122)	(50,837)	(123,325)	(100,362)
Income tax expense			226
Net Loss	$ (66,122)	$ (50,837)	$ (123,551)	$ (100,362)
Net loss per share, basic	$ (0.75)	$ (0.59)	$ (1.41)	$ (1.18)
Net loss per share, diluted	$ (0.75)	$ (0.59)	$ (1.41)	$ (1.18)
Weighted average number of shares used in computing net loss per share, basic	87,586	86,635	87,501	85,270
Weighted average number of shares used in computing net loss per share, diluted	87,586	86,635	87,501	85,270
Comprehensive Loss
Net loss	$ (66,122)	$ (50,837)	$ (123,551)	$ (100,362)
Other comprehensive income (loss)
Unrealized gain (loss) on short-term investments	(263)	353	(53)	808
Comprehensive Loss	$ (66,385)	$ (50,484)	$ (123,604)	$ (99,554)