CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flow from operating activities:
Net loss	$ (75,521)	$ (51,511)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	11,906	5,476
Depreciation and amortization expense	96	68
Accretion of discounts and amortization of premiums on investments, net	(3,057)	(910)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	483	4,677
Other long-term assets	(110)	(1,872)
Accounts payable	(164)	1,368
Accrued and other liabilities	9,999	3,672
Operating lease assets and liabilities, net	(26)	43
Other liabilities	(384)	(133)
Net cash used in operating activities	(56,778)	(39,122)
Cash flow from investing activities:
Purchases of short-term investments	(123,982)	(147,623)
Maturities of short-term investments	136,000	154,744
Purchases of property and equipment	(142)	(195)
Net cash provided by investing activities	11,876	6,926
Cash flow from financing activities:
Proceeds from sale of common stock in connection with ATM, net	44,888
Payments for offering costs	(234)	(371)
Proceeds from issuance of common stock under ESPP	356	150
Proceeds from issuance of common stock upon exercise of stock options	986	617
Net cash provided by financing activities	45,996	396
Net increase (decrease) in cash and cash equivalents	1,094	(31,800)
Cash and cash equivalents at the beginning of the year	22,397	54,197
Cash and cash equivalents at the end of the period	$ 23,491	22,397
Supplemental disclosure of noncash investing and financing activities:
Right-of-use asset obtained in exchange for operating lease liability		765
Deferred offering costs included in accounts payable		$ 15