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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities:    
Net loss $ (6,011) $ (5,532)
Net loss from discontinued operations 124 1,106
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 32 39
Stock-based compensation expense related to employee and director stock awards 137 201
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 254 222
Accretion of interest and amortization of debt discounts on convertible notes 871 1,119
Changes in operating assets and liabilities:    
Accounts receivable (24) 913
Inventory 83 (195)
Prepaid expenses and other current assets (70) 82
Other assets (16) (10)
Accounts payable and accrued liabilities (532) (1,289)
Operating lease liabilities (265) (224)
Net cash used in operating activities, continuing operations (4,211) (3,539)
Investing activities:    
Proceeds from divestiture of subsidiary 1,070 0
Purchases of property and equipment (6) (16)
Net cash provided by (used in) investing activities, continuing operations 1,064 (16)
Financing activities:    
Payments on Secured Convertible Notes (1,990) (770)
Debt issuance cost (115) (294)
Net cash provided by financing activities, continuing operations 1,000 1,936
Net decrease in cash, cash equivalents, and restricted cash, continuing operations (2,147) (1,619)
Net decrease in cash and cash equivalents, discontinued operations (206) (279)
Net decrease in cash, cash equivalents, and restricted cash, consolidated (2,353) (1,898)
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 (293)
Cash, cash equivalents and restricted cash of continuing operations, end of period 1,253 3,655
Supplemental disclosure of cash flow information:    
Interest paid in continuing operations 147 174
Interest paid in discontinued operations 0 15
Supplemental disclosure of non-cash information:    
Conversion of Preferred Stock to common stock 1,944 995
Down round feature adjustments related to Preferred Stock 380 1,996
Down round feature adjustments related to common stock warrants 1,005 0
Issuance of embedded derivative liability in conjunction with Unsecured Convertible Notes 224 0
Warrant liabilities transferred to equity 242 169
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
Underwritten Registered Direct Offering [Member]    
Financing activities:    
Proceeds from issuance of common stock and pre-funded warrants in an underwritten registered direct offering, net of issuance costs 2,858 0
Warrants and Pre-funded Warrants [Member]    
Financing activities:    
Proceeds from Warrant Exercise 247 0
Warrant Liability [Member]    
Supplemental disclosure of non-cash information:    
Warrant liabilities transferred to equity $ 312 $ 1,360