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Consolidated Statements of Cash Flows
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Operating activities:    
Net loss $ (7,223) $ (9,640)
Net income from held-for-sale assets (111) (404)
Net loss from discontinued operations 124 3,899
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 40 51
Stock-based compensation expense related to employee and director stock awards 148 291
Non-cash loss on divestiture of subsidiary (865) (0)
Extinguishment of Secured Convertible Note (13) 0
Non-cash expense incurred to obtain consent of Secured Convertible Note holders 368 0
Modification of common stock warrants, included in Other expense 69 292
Non-cash gain on changes in fair value of warrant liability (114) (272)
Non-cash loss (gain) on changes in fair value of embedded derivative liability 18 (40)
Non-cash right-of-use amortization 341 305
Accretion of interest and amortization of debt discounts on convertible notes 874 1,690
Changes in operating assets and liabilities:    
Accounts receivable 291 846
Inventory (272) 162
Prepaid expenses and other current assets (48) 11
Other assets (2) (6)
Accounts payable and accrued liabilities (195) (1,127)
Operating lease liabilities (369) (319)
Net cash used in operating activities, continuing operations (5,183) (4,261)
Investing activities:    
Proceeds from divestiture of subsidiary 1,070 0
Purchases of property and equipment (6) (19)
Net cash provided by (used in) investing activities, continuing operations 1,064 (19)
Financing activities:    
Payments on Secured Convertible Notes (1,990) (1,474)
Cash debt issuance cost (115) (181)
Net cash provided by financing activities, continuing operations 1,500 1,910
Net decrease in cash, cash equivalents, and restricted cash, continuing operations (2,619) (2,370)
Net increase in cash and cash equivalents, held-for-sale assets 126 503
Net decrease in cash and cash equivalents, discontinued operations (206) (373)
Net decrease in cash, cash equivalents and restricted cash, consolidated (2,699) (2,240)
Cash, cash equivalents and restricted cash, beginning of year 3,606 5,846
Less: Cash and cash equivalents of discontinued operations, end of period 0 (206)
Cash, cash equivalents and restricted cash of continuing operations, end of year 907 3,400
Supplemental disclosure of cash flow information:    
Interest paid in continuing operations 147 174
Interest paid in discontinued operations 0 15
Conversions of preferred stock to common stock 1,944 1,023
Down round feature adjustments related to preferred stock 380 7,057
Down round feature adjustments related to common stock warrants 1,005 0
Issuance of 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
Bridge Loan [Member]    
Financing activities:    
Proceeds from Bridge Loan 500 0
Underwritten Registered Direct Offering [Member]    
Financing activities:    
Proceeds from issuance of common stock and pre-funded warrants the 2024 Public Offering, net of issuance costs 2,858 0
Warrants and Pre-funded Warrants [Member]    
Financing activities:    
Proceeds from Warrants Exercise 247 565
Warrant Liability [Member]    
Supplemental disclosure of cash flow information:    
Warrant liabilities transferred to equity $ 312 $ 1,360