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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating activities:    
Net loss $ 5,748 $ (4,799)
Net (income) from discontinued operations, net of taxes (11,042) (196)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 3 18
Stock-based compensation expense related to employee and director stock awards 6 115
Non-cash expense incurred to obtain consent of Secured Convertible Note holders 0 368
Non-cash gain on changes in fair value of warrant liability (0) (114)
Non-cash loss on changes in fair value of embedded derivative liability (0) 18
Non-cash loss on modification of warrants 0 69
Non-cash right-of-use asset amortization 90 168
Impairment of long-lived assets 589 0
Accretion of interest and amortization of debt discounts on convertible notes 46 726
Changes in operating assets and liabilities:    
Accounts receivable 0 243
Inventory (467) (7)
Prepaid expenses and other current assets (32) 35
Other assets 1 2
Accounts payable and accrued liabilities 919 137
Operating lease liabilities (176) (162)
Net cash used in operating activities, continuing operations (4,315) (3,379)
Investing activities:    
Purchases of property and equipment 0 (2)
Net cash used in investing activities, continuing operations 0 (2)
Financing activities:    
Payments on Secured Convertible Notes 0 (1,200)
Warrant repurchases (1,989) 0
Payment on Bridge Note (507) 0
Cash debt issuance cost 0 (115)
Net cash used in financing activities, continuing operations (1,882) (1,089)
Net decrease in cash, cash equivalents, and restricted cash, continuing operations (6,197) (4,470)
Net increase in cash and cash equivalents, discontinued operations 11,111 2,091
Net increase (decrease) in cash, cash equivalents, and restricted cash, consolidated 4,914 (2,379)
Cash, cash equivalents and restricted cash, beginning of period 907 3,606
Cash, cash equivalents and restricted cash of continuing operations, end of period 5,821 1,227
Supplemental disclosure of cash flow information:    
Interest paid 8 130
Supplemental disclosure of non-cash information:    
Conversions of preferred stock to common stock 0 1,944
Down round feature adjustments related to preferred stock 0 380
Issuance of derivative liability in conjunction with Unsecured Convertible Notes 0 224
Warrant liabilities transferred to equity 0 242
Warrants and Pre-funded Warrants [Member]    
Financing activities:    
Proceeds from warrant exercises 614 226
Warrant Liability [Member]    
Supplemental disclosure of non-cash information:    
Warrant liabilities transferred to equity $ 0 $ 312