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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:        
Net loss $ (2,009) $ (1,346) $ (5,339) $ (9,926)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation 3 4 15 20
Amortization of right-of-use asset – operating 16 25 96 94
Share-based compensation 114 204 686 556
Loss from disposal of property and equipment     5
Change in operating assets and liabilities:        
Other current assets (606) (598) 93 808
Other assets     6
Accounts payable 167 32 28 (783)
Accrued compensation and employee benefits (16) 62 (73) (752)
Accrued expenses and other liabilities 803 22 (526) (934)
Net cash used in operating activities (1,528) (1,595) (5,014) (10,912)
Cash flows from investing activities:        
Purchase of property and equipment     (2)
Net cash used in investing activities (2)
Cash flows from financing activities:        
Net cash provided by financing activities
Net decrease in cash and cash equivalents (1,528) (1,595) (5,014) (10,914)
Cash and cash equivalents, beginning of year 37,431 42,445 42,445 53,359
Cash and cash equivalents, end of year 35,903 40,850 37,431 42,445
Supplemental cash flow information:        
Interest paid
Income tax refund received
Supplemental disclosure of noncash investing and financing transactions:        
Leased assets and operating lease liabilities – amended lease term $ 214