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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net loss $ (3,214,000) $ (1,739,000)
Net loss from discontinued operations 124,000 394,000
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 12,000 13,000
Stock-based compensation expense related to employee and director stock awards 60,000 75,000
Loss on divestiture of subsidiary 865,000 0
Non-cash expense incurred to obtain consent of Secured Convertible Note holders 368,000 0
Non-cash gain on changes in fair value of warrant liabilities (194,000) (0)
Non-cash gain on changes in fair value of embedded derivative liability (65,000) (0)
Accretion of interest and amortization of debt discounts on convertible notes 415,000 0
Changes in operating assets and liabilities:    
Accounts receivable (54,000) 250,000
Inventory (107,000) (80,000)
Prepaid expenses and other current assets (115,000) (45,000)
Operating lease right-of-use assets 84,000 59,000
Other assets 1,000 (6,000)
Accounts payable and accrued liabilities 308,000 (74,000)
Operating lease liabilities (60,000) (34,000)
Net cash used in operating activities, continuing operations (1,572,000) (1,187,000)
Investing activities:    
Proceeds from divestiture of subsidiary 1,070,000 0
Purchases of property and equipment (2,000) (13,000)
Net cash provided by (used in) investing activities, continuing operations 1,068,000 (13,000)
Financing activities:    
Payments on Secured Convertible Notes (578,000) 0
Debt issuance cost (19,000) 0
Net cash used in financing activities, continuing operations (597,000) 0
Net decrease in cash, cash equivalents, and restricted cash, continuing operations (1,101,000) (1,200,000)
Net decrease in cash and cash equivalents, discontinued operations (206,000) (424,000)
Net decrease in cash, cash equivalents, and restricted cash, consolidated (1,307,000) (1,624,000)
Cash, cash equivalents and restricted cash, beginning of year, consolidated 3,606 5,846
Less: Cash and cash equivalents of discontinued operations, end of period 0 (52)
Cash, cash equivalents and restricted cash of continuing operations, end of period 2,299,000 4,170,000
Supplemental disclosure of cash flow information:    
Interest paid in continuing operations 236,000 0
Interest paid in discontinued operations 0 5,000
Supplemental disclosure of non-cash information:    
Conversion of Preferred Stock to common stock 465,000 0
Down round feature adjustments related to Preferred Stock 380,000 0
Issuance of embedded derivative liability in conjunction with Unsecured Convertible Notes $ 224,000 $ 0