Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Operating activities:
Net loss	$ (3,501)	$ (3,325)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	22	16
Reduction in the carrying amount of right-of-use assets	79	71
Share-based compensation	278	319
Changes in operating assets and liabilities:
Accounts receivable	48	(179)
Prepaid expenses and other current assets	20	57
Other receivable due from related party	0	0
Accounts payable	345	257
Accrued expenses and other current liabilities	226	(201)
Deferred revenue	(1)	101
Operating lease liability	(76)	(29)
Net cash used in operating activities	(2,560)	(2,913)
Investing activities:
Purchase of property and equipment	(10)	(29)
Net cash used in investing activities	(10)	(29)
Financing activities:
Proceeds from sales of common stock	244	0
Issuance costs of sale of common stock	(180)	0
Net cash provided by financing activities	64	0
Net change in cash and cash equivalents	(2,506)	(2,942)
Cash and cash equivalents at beginning of period	7,363	12,872	$ 12,872
Cash and cash equivalents at end of period	4,857	9,930	$ 7,363
Supplemental disclosure of noncash investing and financing activities:
Unpaid issuance costs of common stock	$ 6	$ 0