Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (26,693)	$ (11,143)
Adjustments to reconcile net loss to net cash used by operations:
Stock-based compensation	2,278	468
Accretion of discounts on available-for-sale marketable securities	(280)	(78)
Depreciation and amortization expense	482	394
Non-cash lease expense	526	384
Changes in assets and liabilities:
Prepaid expense and other current assets	(2,573)	(161)
Other non-current assets	(293)	(435)
Accounts payable	3,068	105
Accrued compensation	(1,449)	(777)
Other accrued expenses and current liabilities	(71)	126
Operating lease liability	(520)	(341)
Net cash used in operating activities	(25,525)	(11,458)
Cash flows from investing activities
Purchases of available-for-sale marketable securities	(145,336)
Proceeds from maturities of available-for-sale marketable securities	23,000	13,683
Purchases of property and equipment	(543)	(28)
Net cash provided by (used in) investing activities	(122,879)	13,655
Cash flows from financing activities
Proceeds from issuance of common stock upon initial public offering, net of underwriting commissions	341,171
Proceeds from exercise of common stock options	64	24
Principal paid on finance lease liabilities	(231)	(168)
Payments for offering costs	(2,955)
Net cash provided by (used in) financing activities	338,049	(144)
Net increase in cash and cash equivalents and restricted cash	189,645	2,053
Cash, cash equivalents and restricted cash, at beginning of period	35,212	38,289
Cash, cash equivalents and restricted cash, at end of period	224,857	40,342
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position
Cash and cash equivalents	224,287	39,786
Restricted cash	570	556
Cash, cash equivalents and restricted cash at end of period	224,857	40,342
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 accrued expenses and current liabilities	406
Purchases of property and equipment in accounts payable	89
Vesting of restricted stock	6	18
Right-of-use asset obtained in exchange for operating and finance lease liability	2,518	357
Supplemental disclosure of cash flow information
Cash paid for interest	$ 44	$ 44