Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating expenses:
Research and development	$ 75,791	$ 29,373
General and administrative	20,919	5,398
Total operating expenses	96,710	34,771
Loss from operations	(96,710)	(34,771)
Interest expense	(1,604)	(4,942)
Net change in fair value of redeemable convertible preferred stock tranche obligations	(8,783)
Change in fair value of derivative liabilities	6,453	(1,216)
Loss on extinguishment of convertible notes	(2,316)
Other income (expense), net	4,813	(22)
Net loss and comprehensive loss	$ (98,147)	$ (40,951)
Net loss per share attributable to common stockholders, basic	$ (16.53)	$ (104.4)
Net loss per share attributable to common stockholders, diluted	$ (16.53)	$ (104.4)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic	5,938,782	392,268
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted	5,938,782	392,268