Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flow from operating activities:
Net loss	$ (35,545)	$ (22,901)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	5,418	2,248
Depreciation and amortization expense	43	28
Accretion of discounts and amortization of premiums on investments, net	(1,310)	(32)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(98)	5,493
Other long-term assets	(55)	(428)
Accounts payable	2,894	875
Accrued and other liabilities	2,554	191
Operating lease assets and liabilities, net	(43)	(11)
Other liabilities	(225)
Net cash used in operating activities	(26,367)	(14,537)
Cash flow from investing activities:
Purchases of short-term investments	(48,346)	(71,791)
Maturities of short-term investments	67,750	59,744
Purchases of property and equipment	(46)	(158)
Net cash provided by (used in) investing activities	19,358	(12,205)
Cash flow from financing activities:
Proceeds from sale of common stock in connection with ATM, net	44,888
Payments for offering costs	(159)
Proceeds from issuance of common stock under ESPP	228
Proceeds from issuance of common stock upon exercise of stock options	556	2
Net cash provided by financing activities	45,513	2
Net increase (decrease) in cash and cash equivalents	38,504	(26,740)
Cash and cash equivalents at the beginning of the year	22,397	54,197
Cash and cash equivalents at the end of the period	60,901	27,457
Supplemental disclosure of noncash investing and financing activities:
Right-of-use asset obtained in exchange for operating lease liability		765
Offering costs included in accounts payable	$ 75	$ 1