Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (89,988)	$ (39,699)
Adjustments to reconcile net loss to net cash used by operations:
Stock-based compensation	6,975	1,436
Accretion of discounts on available-for-sale marketable securities	(5,428)	(510)
Depreciation and amortization expense	1,570	1,245
Non-cash lease expense	1,859	1,266
Changes in assets and liabilities:
Prepaid expense and other current assets	(666)	(207)
Other non-current assets	(995)	(37)
Accounts payable	6,034	1,104
Accrued compensation	1,628	444
Other accrued expenses and current liabilities	3,278	2,327
Other non-current liabilities	296
Operating lease liability	(1,752)	(1,216)
Net cash used in operating activities	(77,189)	(33,847)
Cash flows from investing activities
Purchases of available-for-sale marketable securities	(362,751)	(53,862)
Proceeds from maturities of available-for-sale marketable securities	174,300	13,683
Purchases of property and equipment	(1,673)	(287)
Net cash used in provided by investing activities	(190,124)	(40,466)
Cash flows from financing activities
Proceeds from issuance of common stock upon initial public offering, net of underwriting commissions	341,171
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		59,900
Proceeds from exercise of common stock options	227	370
Principal paid on finance lease liabilities	(709)	(562)
Payments for offering costs	(3,361)	(156)
Net cash provided by financing activities	337,328	59,552
Net increase (decrease) in cash and cash equivalents and restricted cash	70,015	(14,761)
Cash, cash equivalents and restricted cash, at beginning of period	35,212	38,289
Cash, cash equivalents and restricted cash, at end of period	105,227	23,528
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position
Cash and cash equivalents	104,663	22,967
Restricted cash	564	561
Cash, cash equivalents and restricted cash at end of period	105,227	23,528
Supplemental disclosure for non-cash investing and financing activities
Conversion of 114,556,997 shares of redeemable convertible preferred stock to common stock upon the closing of initial public offering	180,574
Unpaid deferred offering costs included in accounts payable and other current liabilities		729
Purchases of property and equipment in accounts payable	10
Vesting of restricted stock	6	53
Right-of-use asset obtained in exchange for operating and finance lease liability	2,518	854
Supplemental disclosure of cash flow information
Cash paid for interest	$ 115	$ 140