Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (10,490)	$ (9,895)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	60	44
Amortization of operating lease right-of-use assets	385	328
Share-based compensation expense	159	315
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(17)	52
Accounts payable	12	124
Operating lease liability	(360)	(339)
Accrued expenses and other liabilities	(231)	517
Net cash used in operating activities	(10,482)	(8,854)
Cash flows from investing activities:
Purchases of property and equipment	(160)	(77)
Net cash used in investing activities	(160)	(77)
Cash flows from financing activities:
Proceeds from exercise of warrants		8,509
Proceeds from issuance of common stock and warrants, net of commissions and issuance costs	7,962
Net cash provided by financing activities	7,962	8,509
(Decrease) Increase in cash and cash equivalents and restricted cash	(2,680)	(422)
Cash, cash equivalents and restricted cash at beginning of period	19,181	19,603
Cash, cash equivalents and restricted cash at end of period	16,501	19,181
Supplemental disclosure of cash flow information and non-cash investing and financing activities:
Fair value of warrants issued in connection with financing activities	5,225
Increase in operating right-of-use assets and liabilities related to lease modifications		629
Cash and cash equivalents	16,351	19,031
Restricted cash included in other non-current assets	150	150
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 16,501	$ 19,181