Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenue	$ 63,745	$ 25,706	$ 81,144	$ 38,714
Operating expenses
Research and development	38,325	62,020	89,922	118,898
General and administrative	10,343	12,371	23,616	25,092
Restructuring and related costs	18,422	0	39,465	0
Total operating expenses	67,090	74,391	153,003	143,990
Loss from operations	(3,345)	(48,685)	(71,859)	(105,276)
Interest income	2,519	4,911	5,708	9,007
Unrealized gain on equity securities	0	4,808	0	8,487
Non-cash interest expense related to the sale of future royalties	(9,647)	(7,286)	(18,991)	(14,470)
Interest and other income (expense), net	(1,044)	(1,758)	(2,336)	(3,971)
Loss before provision for income taxes	(11,517)	(48,010)	(87,478)	(106,223)
(Benefit) from / provision for income taxes	(18)	8	(11)	8
Net loss	$ (11,499)	$ (48,018)	$ (87,467)	$ (106,231)
Net loss per share, basic	$ (0.14)	$ (0.59)	$ (1.04)	$ (1.49)
Net loss per share, diluted	$ (0.14)	$ (0.59)	$ (1.04)	$ (1.49)
Weighted-average shares used in computing basic net loss per share	84,580,125	81,224,628	83,846,892	71,341,211
Weighted-average shares used in computing diluted net loss per share	84,580,125	81,224,628	83,846,892	71,341,211