Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (55,496)	$ (24,234)
Adjustments to reconcile net loss to net cash used by operations:
Stock-based compensation	3,562	915
Accretion of discounts on available-for-sale marketable securities	(2,535)	(70)
Depreciation and amortization expense	1,012	807
Non-cash lease expense	1,187	822
Changes in assets and liabilities:
Prepaid expense and other current assets	535	(899)
Other non-current assets	(332)	136
Accounts payable	967	595
Accrued compensation	(90)	(275)
Other accrued expenses and current liabilities	2,621	263
Operating lease liability	(1,131)	(775)
Net cash used in operating activities	(49,700)	(22,715)
Cash flows from investing activities
Purchases of available-for-sale marketable securities	(225,229)
Proceeds from maturities of available-for-sale marketable securities	36,000	13,683
Purchases of property and equipment	(1,571)	(31)
Net cash (used in) provided by investing activities	(190,800)	13,652
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		25,059
Proceeds from exercise of common stock options	137	60
Principal paid on finance lease liabilities	(467)	(357)
Payments for offering costs	(3,361)
Net cash provided by financing activities	337,480	24,762
Net increase in cash and cash equivalents and restricted cash	96,980	15,699
Cash, cash equivalents and restricted cash, at beginning of period	35,212	38,289
Cash, cash equivalents and restricted cash, at end of period	132,192	53,988
Reconciliation of cash, cash equivalents and restricted cash to statement of financial position
Cash and cash equivalents	131,618	53,430
Restricted cash	574	558
Cash, cash equivalents and restricted cash at end of period	132,192	53,988
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
Purchases of property and equipment in accounts payable	6	23
Vesting of restricted stock	6	35
Right-of-use asset obtained in exchange for operating and finance lease liability	2,518	744
Supplemental disclosure of cash flow information
Cash paid for interest	$ 82	$ 90