Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net loss	$ (7,636)	$ (8,491)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	125	108
Stock-based compensation expense	446	328
Non-cash lease expense	432	311
Non-cash interest and other expense, net	53	64
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(28)	178
Accounts payable	12	(323)
Accrued expenses and other liabilities	(1,214)	1,063
Interest payable	7	2
Operating lease liabilities	(500)	(347)
Cash used in operating activities	(8,303)	(7,107)
Investing activities:
Purchase of property and equipment	(46)	(3)
Cash used in investing activities	(46)	(3)
Financing activities:
Proceeds from the issuance of common stock, net of issuance costs	44	1,403
Cash provided by financing activities	44	1,403
Net decrease in cash and cash equivalents	(8,305)	(5,707)
Cash, cash equivalents and restricted cash at beginning of period	31,598	51,829
Cash, cash equivalents and restricted cash at end of period	23,293	46,122
Supplemental disclosure of cash flow information:
Cash paid for interest	292	268
Cash paid for income taxes	$ 24
Non-cash investing activities:
Property and equipment in accounts payable		$ 16