Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 6,288	$ 0
Operating expenses:
Research and development	86,379	93,715
General and administrative	41,739	43,400
Total operating expenses	128,118	137,115
Loss from operations	(121,830)	(137,115)
Other income (expense), net:
Interest income and other expense, net	9,157	3,911
Total other income (expense), net	9,157	3,911
Net loss	(112,673)	(133,204)
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities	811	(753)
Net comprehensive loss	$ (111,862)	$ (133,957)
Net loss per share, basic (in dollars per share)	$ (1.95)	$ (2.37)
Net loss per share, diluted (in dollars per share)	$ (1.95)	$ (2.37)
Weighted-average number of shares used to compute net loss per share, basic (in shares)	57,744	56,201
Weighted-average number of shares used to compute net loss per share, diluted (in shares)	57,744	56,201