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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (588) $ (1,097)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1
Stock-based compensation 107 67
Noncash interest expense 34
Change in fair value of equity investment (2)
Changes in operating assets and liabilities:    
Trade receivable (42) (49)
Other accounts receivable and prepaid expenses (143) (70)
Inventory 144 (38)
Trade payables (101) (21)
Other accounts payable and accrued expenses 21 41
Deferred revenue (11) (32)
Net cash used in operating activities (579) (1,200)
Cash flows from investing activities:    
Purchases of fixed assets (1) (1)
Net cash used in investing activities (1) (1)
Cash flows from financing activities:    
Proceeds from exercise of options 7
Net cash provided by financing activities 7
Effects of currency translation on cash (3) (7)
Net (decrease) increase in cash (583) (1,201)
Cash at beginning of period 3,283 2,713
Cash at end of period 2,700 1,512
Supplemental disclosures of cash flow information:    
Cash paid for interest
Cash paid for taxes