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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (2,898) $ (3,389)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1 1
Stock-based compensation 169 287
Noncash interest expense 102
Change in fair value of equity investment 1 12
Changes in operating assets and liabilities:    
Trade receivable (23) (26)
Prepaid expenses and other accounts receivable 542 (1,008)
Inventory (1,004) (1,378)
Trade payables (4) (46)
Other accounts payable and accrued expenses 61 (77)
Deferred revenue (55) (78)
Accrued severance pay, net (3) (2)
Net cash used in operating activities (3,111) (5,704)
Cash flows from investing activities:    
Purchases of equipment (1) (4)
Net cash used in investing activities (1) (4)
Cash flows from financing activities:    
Proceeds from issuance of common stock 4,215
Proceeds from exercise of options 7
Net cash provided by financing activities 4,222  
Effects of currency translation on cash and cash equivalents (36) (57)
Net increase (decrease) in cash 1,074 (5,765)
Cash at beginning of period 2,713 7,737
Cash at end of period $ 3,787 $ 1,972