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Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Statement of Cash Flows [Abstract]    
Net loss $ (2,123,000) $ (4,276,000)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 325,000 344,000
Stock-based compensation 496,000 211,000
Stock and options issued for services 11,000 173,000
Changes in assets and liabilities    
Accounts receivable (1,033,000) 81,000
Other receivables (15,000) (77,000)
Inventories 300,000 103,000
Prepaid expenses and other assets (27,000) (78,000)
Accounts payable 195,000 828,000
Accrued expenses (137,000) 72,000
Net cash used in operating activities (2,008,000) (2,619,000)
Investing activities    
Purchase of property and equipment (13,000)
Net cash used in investing activities (13,000)
Financing activities    
Proceeds from issuance of stock 5,000
Net cash provided by financing activities 5,000
Net decrease in cash and restricted cash (2,008,000) (2,627,000)
Cash and restricted cash, beginning of period 3,019,000 5,675,000
Cash and restricted cash, end of period 1,011,000 3,048,000
Cash paid during the year for:    
Amounts included in the measurement of lease liabilities 20,000 60,000
Non-cash financing and investing activities:    
Value of shares relinquished in modification of stock-based compensation awards (Note 7) $ 24,000