Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Net loss	$ (9,499)	$ (8,879)
Depreciation	64	61
Reduction in the carrying amount of right-of-use assets	242	219
Share-based compensation	846	903
Loss on disposal of property and equipment	4	0
Accounts receivable	97	(153)
Prepaid expenses and other current assets	123	275
Accounts payable	(24)	380
Accrued expenses and other current liabilities	598	265
Deferred revenue	(341)	(469)
Operating lease liability	(233)	(166)
Net cash used in operating activities	(8,123)	(7,564)
Purchase of property and equipment	(12)	(68)
Net cash used in investing activities	(12)	(68)
Proceeds from sales of common stock	3,042	1,658
Issuance costs of sale of common stock	(435)	(231)
Net cash provided by financing activities	2,607	1,427
Net change in cash and cash equivalents	(5,528)	(6,205)
Cash and cash equivalents at beginning of period	7,363	12,872
Cash and cash equivalents at end of period	1,835	6,667
Unpaid issuance costs of common stock	20	0
Issuance of restricted stock units in lieu of cash bonus obligations	$ 564	$ 401