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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities:    
Net loss $ (6,244) $ (5,650)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 21 52
Reduction in the carrying amount of right-of-use assets 299 268
Share-based compensation 345 565
Allowance for doubtful accounts 0 (34)
Changes in operating assets and liabilities:    
Accounts receivable (0) (87)
Prepaid expenses and other current assets (173) (179)
Accounts payable 528 (165)
Accrued expenses and other current liabilities 252 (485)
Operating lease liability (313) (270)
Net cash used in operating activities (4,939) (5,453)
Investing activities:    
Purchase of property and equipment (1) (5)
Net cash used in investing activities (1) (5)
Financing activities:    
Proceeds from sales of common stock 8,690 10,513
Issuance costs of sale of common stock 834 1,228
Net cash provided by financing activities 7,856 9,285
Net change in cash and cash equivalents 2,916 3,827
Cash and cash equivalents at beginning of period 2,371 1,103
Cash and cash equivalents at end of period 5,287 4,930
Supplemental disclosure of noncash investing and financing activities:    
Unpaid issuance costs of common stock $ 173 $ 40