Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenues	$ 16,924	$ 25,147	$ 40,010	$ 59,140
Operating expenses
Research and development	45,669	31,714	126,660	94,036
General and administrative	15,269	14,643	45,780	44,825
Total operating expenses	60,938	46,357	172,440	138,861
Loss from operations	(44,014)	(21,210)	(132,430)	(79,721)
Interest income	4,550	1,014	9,952	1,327
Unrealized gain on equity securities	694	3,496	2,023	323
Non-cash interest expense related to the sale of future royalties	(5,936)		(6,378)
Interest and other income (expense), net	(2,739)	(2,788)	(8,640)	(4,039)
Loss before provision for income taxes	(47,445)	(19,488)	(135,473)	(82,110)
Provision for income taxes	1,839		2,385	2,500
Net loss	$ (49,284)	$ (19,488)	$ (137,858)	$ (84,610)
Net loss per share, basic	$ (0.81)	$ (0.37)	$ (2.3)	$ (1.74)
Net loss per share, diluted	$ (0.81)	$ (0.37)	$ (2.3)	$ (1.74)
Weighted-average shares used in computing basic loss per share	60,599,025	52,345,732	59,894,181	48,622,258
Weighted-average shares used in computing diluted loss per share	60,599,025	52,345,732	59,894,181	48,622,258