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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Cash flows from operating activities:        
Net loss $ (1,346,000) $ (1,174,000) $ (3,147,000) $ (3,272,000)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation 4,000     5,000
Amortization of right-of-use asset - operating 25,000     23,000
Share-based compensation 204,000     167,000
Loss from disposal of property and equipment       2,000
Change in operating assets and liabilities:        
Other current assets (598,000)     (414,000)
Accounts payable 32,000     (103,000)
Accrued compensation and employee benefits 62,000     (757,000)
Accrued expenses and other liabilities 22,000     51,000
Net cash used in operating activities (1,595,000)     (4,298,000)
Cash flows from investing activities:        
Purchase of property and equipment       (2,000)
Net cash used in investing activities       (2,000)
Cash flows from financing activities:        
Net decrease in cash and cash equivalents (1,595,000)     (4,300,000)
Cash and cash equivalents, beginning of year 42,445,000   $ 49,059,000 53,359,000
Cash and cash equivalents, end of year $ 40,850,000 $ 42,445,000   $ 49,059,000