Unaudited Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net loss	$ (56,241)	$ (32,052)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	32	13
Amortization of loan fees		12
Final payment amortization and loss on debt extinguishment		767
Success fee amortization		17
Stock-based compensation expense	6,412	750
Accretion of discount on short-term investments	(6,247)	(1,409)
Non-cash lease expense	(17)	14
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(4,875)	(2,168)
Accounts receivable - other	(45)	(1)
Other assets	(34)	13
Accounts payable	834	630
Accrued expenses and other current liabilities	2,130	2,380
Net cash used in operating activities	(58,051)	(31,034)
Investing Activities
Proceeds from sales and maturities of short-term investments	517,230	166,371
Purchases of short-term investments	(828,874)	(303,100)
Purchases of property and equipment	(25)
Net cash used in investing activities	(311,669)	(136,729)
Financing Activities
Proceeds from initial public offering, net of issuance costs	406,410
Proceeds from issuance of Series F redeemable convertible preferred stock, net of issuance costs		104,627
Payments of success fee or long-term debt	(365)	(16,284)
Proceeds from exercise of common stock options and issuance of common stock under the employee stock purchase plan	2,244	1,820
Deferred offering costs	(3,424)	(270)
Net cash provided by financing activities	404,865	89,893
Net increase (decrease) in cash, cash equivalents and restricted cash	35,145	(77,870)
Cash, cash equivalents and restricted cash at beginning of period	8,266	88,143
Cash, cash equivalents and restricted cash at end of period	43,411	10,273
Supplemental Disclosure of Cash Flow Information
Cash paid for interest		$ 376
Supplemental Schedule of Non-cash Investing and Financing Activities:
Reclassification of 38,413,909 redeemable convertible preferred stock to 38,413,909 shares of common stock	307,890
Reclassification of deferred offering costs	$ 6,845