Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net loss	$ (8,879)	$ (9,162)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	61	45
Reduction in the carrying amount of right-of-use assets	219	418
Share-based compensation	903	1,237
Changes in operating assets and liabilities:
Accounts receivable	(153)	34
Prepaid expenses and other current assets	275	97
Other receivable due from related party	0	56
Accounts payable	380	100
Accrued expenses and other current liabilities	265	34
Deferred revenue	(469)	203
Operating lease liability	(166)	(453)
Net cash used in operating activities	(7,564)	(7,391)
Investing activities:
Purchase of property and equipment	(68)	(75)
Net cash used in investing activities	(68)	(75)
Financing activities:
Proceeds from sales of common stock	1,658	2,001
Issuance costs of sale of common stock	(231)	(59)
Proceeds from exercise of common stock options	0	5
Net cash provided by financing activities	1,427	1,947
Net change in cash and cash equivalents	(6,205)	(5,519)
Cash and cash equivalents at beginning of period	12,872	21,407
Cash and cash equivalents at end of period	6,667	15,888
Supplemental disclosure of noncash investing and financing activities:
Issuance of restricted stock units in lieu of cash bonus obligations	$ 401	$ 393