Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating expenses:
Research and development	$ 32,137	$ 72,787
General and administrative	40,973	32,852
Restructuring and impairment costs	62,081	0
Total operating expenses	135,191	105,639
Loss from operations	(135,191)	(105,639)
Other income (expense), net:
Interest income, net	10,949	4,587
Loss on disposal of assets	(71)	0
Other expense, net	(338)
Total other income, net	10,540	4,587
Net loss	(124,651)	(101,052)
Unrealized gain (loss) on investments in marketable securities	1,048	(1,048)
Comprehensive loss	$ (123,603)	$ (102,100)
Net loss per share attributable to common stockholders-basic	$ (2.19)	$ (1.84)
Net loss per share attributable to common stockholders-diluted	$ (2.19)	$ (1.84)
Weighted-average shares used in computing net loss per share-basic	57,015,159	54,873,675
Weighted-average shares used in computing net loss per share-diluted	57,015,159	54,873,675