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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 $ (4,799) $ (3,775)
Net loss from discontinued operations 124 702
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 23 26
Stock-based compensation expense related to employee and director stock awards 115 139
Loss on divestiture of subsidiary 865 0
Non-cash expense incurred to obtain consent of Secured Convertible Note holders 368 0
Modification of common stock warrants, included in Other expense, net 69 285
Non-cash gain on changes in fair value of warrant liabilities (114) (216)
Non-cash loss (gain) on changes in fair value of embedded derivative liability 18 (40)
Non-cash right-of-use amortization 168 140
Accretion of interest and amortization of debt discounts on convertible notes 726 457
Changes in operating assets and liabilities:    
Accounts receivable 133 (481)
Inventory (144) (81)
Prepaid expenses and other current assets 1 (83)
Other assets 2 (5)
Accounts payable and accrued liabilities 457 166
Operating lease liabilities (162) (127)
Net cash used in operating activities, continuing operations (2,150) (2,893)
Investing activities:    
Proceeds from divestiture of subsidiary 1,070 0
Purchases of property and equipment (4) (15)
Net cash provided by (used in) investing activities, continuing operations 1,066 (15)
Financing activities:    
Proceeds from Warrant Exercise 226 0
Payments on Secured Convertible Notes (1,200) (193)
Debt issuance cost (115) (294)
Net cash (used in) provided by financing activities, continuing operations (1,089) 2,513
Net decrease in cash, cash equivalents, and restricted cash, continuing operations (2,173) (395)
Net decrease in cash and cash equivalents, discontinued operations (206) (561)
Net decrease in cash, cash equivalents, and restricted cash, consolidated (2,379) (956)
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 (16)
Cash, cash equivalents and restricted cash of continuing operations, end of period 1,227 4,874
Supplemental disclosure of cash flow information:    
Interest paid in continuing operations 130 47
Interest paid in discontinued operations 0 9
Supplemental disclosure of non-cash information:    
Conversion of Preferred Stock to common stock 1,944 849
Down round feature adjustments related to Preferred Stock 380 1,996
Issuance of embedded derivative liability in conjunction with Unsecured Convertible Notes 224 0
Warrant liabilities transferred to equity 242 0
Convertible Notes and May 2023 Warrants [Member]    
Financing activities:    
Proceeds from issuance of Secured Convertible Notes and May 2023 Warrants, net of discounts 0 3,000
Warrant Liability [Member]    
Supplemental disclosure of non-cash information:    
Warrant liabilities transferred to equity $ 312 $ 1,360