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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract    
Net loss $ (2,712) $ (2,267)
us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract    
Depreciation 12 19
Reduction in the carrying amount of right-of-use assets 97 87
Share-based compensation 170 204
Allowance for doubtful accounts 0 (24)
us-gaap_IncreaseDecreaseInOperatingCapitalAbstract    
Accounts receivable (0) (29)
Prepaid expenses and other current assets (27) (43)
Accounts payable 422 155
Accrued expenses and other current liabilities 467 311
Operating lease liability (101) (87)
Net cash used in operating activities (1,618) (1,530)
us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract    
Proceeds from sales of common stock 212 1,466
Issuance costs of sale of common stock 16 90
Net cash provided by financing activities 196 1,376
Net change in cash and cash equivalents (1,422) (154)
Cash and cash equivalents at beginning of period 2,371 1,103
Cash and cash equivalents at end of period 949 949
us-gaap_SupplementalCashFlowElementsAbstract    
Unpaid issuance costs of common stock $ 17 $ 181