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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (4,687,000) $ (2,826,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 6,000 8,000
Amortization of right-of-use asset - operating 25,000 50,000
Share-based compensation 226,000 391,000
Change in operating assets and liabilities:    
Other current assets (376,000) (345,000)
Accounts payable 209,000 (93,000)
Accrued compensation and employee benefits 9,000 17,000
Accrued expenses and other liabilities 426,000 509,000
Net cash used in operating activities (4,162,000) (2,289,000)
Cash flows from investing activities:    
Net cash used in investing activities 0 0
Cash flows from financing activities:    
Proceeds from issuance of common stock associated with stock options 14,000 0
Net cash provided by financing activities 14,000 0
Net decrease in cash and cash equivalents (4,148,000) (2,289,000)
Cash and cash equivalents, beginning of year 37,431,000 42,445,000
Cash and cash equivalents, end of period 33,283,000 40,156,000
Supplemental disclosure of noncash investing and financing transactions:    
Leased assets and operating lease liabilities - amended lease term $ 214,000 $ 0