Condensed Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (26,455)	$ (21,004)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,538	1,270
Depreciation	3	3
(Accretion) amortization of premiums on investments, net	(372)	149
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(382)	(1,037)
Accounts payable	630	(426)
Accrued research and development expenses	(378)	1,970
Accrued compensation and related expenses	(1,201)	(461)
Accrued other expenses	70	993
Operating right-of-use assets and lease liabilities, net	(4)	4
Net cash used in operating activities	(26,551)	(18,539)
Cash flows from investing activities:
Purchases of short-term investments	(34,405)	(34,291)
Maturities of short-term investments	48,450	14,200
Net cash provided by (used in) investing activities	14,045	(20,091)
Cash flows from financing activities:
Proceeds from follow-on public offering	23,000	0
Follow-on public offering costs	(1,813)	0
Proceeds from exercise of stock options	48	0
Net cash provided by financing activities	21,235	0
Net increase (decrease) in cash and cash equivalents	8,729	(38,630)
Cash and cash equivalents at the beginning of the period	10,775	66,346
Cash and cash equivalents at the end of the period	19,504	27,716
Supplemental disclosure of cash flow information:
Follow-on public offering costs in accrued other expenses	$ 9	$ 0