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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating activities:    
Net loss $ (7,946) $ (11,571)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 67 84
Reduction in the carrying amount of right-of-use assets 363 327
Share-based compensation 741 1,030
Loss on disposal of property and equipment (0) (4)
Allowance for doubtful accounts (34) 23
Changes in operating assets and liabilities:    
Accounts receivable (97) (115)
Prepaid expenses and other current assets (44) (5)
Accounts payable (316) 184
Accrued expenses and other current liabilities (678) 482
Deferred revenue 0 (341)
Operating lease liability (364) (316)
Net cash used in operating activities (8,026) (9,974)
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Purchase of property and equipment (6) (12)
Net cash used in investing activities (6) (12)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Proceeds from sales of common stock 10,552 4,388
Issuance costs of sale of common stock 1,252 662
Net cash provided by financing activities 9,300 3,726
Net change in cash and cash equivalents 1,268 (6,260)
Cash and cash equivalents at beginning of year 1,103 7,363
Cash and cash equivalents at end of year 2,371 1,103
Supplemental disclosure of noncash investing and financing activities:    
Unpaid issuance costs of common stock 6 195
Issuance of restricted stock units in lieu of cash bonus obligations $ 301 $ 564