CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (52,214)	$ (28,112)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	219	151
Stock-based compensation	9,858	2,456
Non-cash lease expense	228	0
Amortization of premiums and discounts on marketable securities, net	(2,815)	0
Write-off of deferred IPO costs	0	1,741
Changes in operating assets and liabilities:
Prepaid expenses, other current and long-term assets	(5,425)	(1,514)
Operating lease liabilities	(231)	3
Accounts payable	(1,289)	393
Accrued expenses and other liabilities	2,882	950
Net cash used in operating activities	(48,787)	(23,932)
Cash flows from investing activities:
Maturities of marketable securities	40,000	0
Purchases of marketable securities	(226,963)	0
Purchases of property and equipment	(135)	(511)
Net cash used in investing activities	(187,098)	(511)
Cash flows from financing activities:
Proceeds from exercise of stock options	309	578
Payment of deferred offering costs related to the Sales Agreement	(563)	0
Proceeds from the Financing Transaction, net of issuance costs	161,365	0
Cash acquired in connection with the reverse recapitalization	81,821	0
Payment of reverse recapitalization transaction costs	(8,736)	0
Net cash provided by financing activities	234,196	578
Net decrease in cash, cash equivalents and restricted cash	(1,689)	(23,865)
Cash, cash equivalents and restricted cash at the beginning of the period	75,590	110,078
Cash, cash equivalents and restricted cash at the end of the period	73,901	86,213
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	73,847	86,159
Restricted cash	54	54
Total cash, cash equivalents and restricted cash	73,901	86,213
Supplemental disclosure of non-cash operating activities:
Lease liabilities obtained in exchange for right-of-use assets	0	(387)
Deferred offering costs related to the Merger included in accounts payable and accrued expenses and other current liabilities	0	959
Receivables from stock option exercises included in prepaid expenses and other current assets	56	0
Supplemental disclosure of non-cash investing and financing activities:
Conversion of convertible preferred stock to common stock	$ 149,749	$ 0