Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net loss	$ (12,209)	$ (10,546)
Adjustments to reconcile net loss to net cash used in by operating activities:
Share-based compensation expense	2,112	1,772
Depreciation and amortization	122	54
Amortization of premiums and accretion of discounts on short-term investments, net	(523)	0
Change in operating assets and liabilities:
Prepaid expenses and other assets	(379)	(1,455)
Other assets	142	142
Accounts payable	(459)	321
Accrued expenses	(146)	(1,650)
Lease liabilities, net	0	(1)
Net cash used in operating activities	(11,340)	(11,363)
Investing activities
Purchases of short-term investments	(27,622)	0
Proceeds from maturity of short-term investments	20,272	0
Net cash used in investing activities	(7,350)	0
Financing activities
Issuance of common stock, net of issuance costs	0	1
Exercise of warrants and stock options to purchase common stock	16	7
Net cash provided by financing activities	16	8
Net decrease in cash and cash equivalents	(18,674)	(11,355)
Cash and cash equivalents at beginning of period	36,773	103,554
Cash and cash equivalents at end of period	18,099	92,199
Supplemental disclosure of cash flow information
Interest paid	579	102
Interest income	878	10
Supplemental disclosure of noncash activities
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 381	$ 0