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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities:    
Net loss $ (3,913) $ (6,925)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]    
Depreciation 36 43
Reduction in the carrying amount of right-of-use assets 176 159
Share-based compensation 388 595
Allowance for doubtful accounts (34) 0
Changes in operating assets and liabilities:    
Accounts receivable 87 86
Prepaid expenses and other current assets 153 70
Accounts payable 561 69
Accrued expenses and other current liabilities (119) 353
Deferred revenue 0 (8)
Operating lease liability (177) (153)
Net cash used in operating activities (2,842) (5,711)
Investing activities:    
Purchase of property and equipment (3) (12)
Net cash used in investing activities (3) (12)
Financing activities:    
Proceeds from sales of common stock 3,315 2,950
Issuance costs of sale of common stock (152) (285)
Net cash provided by financing activities 3,163 2,665
Net change in cash and cash equivalents 318 (3,058)
Cash and cash equivalents at beginning of period 1,103 7,363
Cash and cash equivalents at end of period 1,421 4,305
Supplemental disclosure of noncash investing and financing activities:    
Unpaid issuance costs of common stock 66 106
Issuance of restricted stock units in lieu of cash bonus obligations $ 0 $ 564