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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating activities:    
Net loss $ (9,640) $ (10,608)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 51 120
Amortization of intangible assets 152 363
Goodwill, intangible and other asset impairment 2,593 6,737
Impairment of property and equipment 2 66
Stock-based compensation expense related to employee and director stock awards 291 220
Non-cash gain on changes in fair value of warrant liability (272) (5,446)
Non-cash gain on changes in fair value of embedded derivative liability (40) (0)
Non-cash gain on changes in fair value of contingent liability 0 (561)
Non-cash loss on modification of common stock warrants 292 1,922
Accretion of interest and amortization of debt discounts on convertible notes 1,690 0
Changes in operating assets and liabilities:    
Accounts receivable 1,214 (305)
Inventory 560 (217)
Prepaid expenses and other current assets 172 218
Operating lease right-of-use assets 417 (1,420)
Other assets (17) (5)
Accounts payable and accrued liabilities (1,158) 667
Operating lease liabilities (438) 1,595
Net cash used in operating activities (4,131) (6,654)
Investing activities:    
Purchases of property and equipment (19) (112)
Net cash used in investing activities (19) (112)
Financing activities:    
Payments on Secured Convertible Notes (1,474) 0
Cash debt issuance cost (181) 0
Proceeds from warrant exercises and issuance of December 2023 Warrants, net 565 1,703
Payment on line of credit 0 (105)
Net cash provided by financing activities 1,910 4,633
Net decrease in cash, cash equivalents, and restricted cash (2,240) (2,133)
Cash, cash equivalents and restricted cash, beginning of year 5,846 7,979
Cash, cash equivalents and restricted cash, end of year 3,606 5,846
Supplemental disclosure of cash flow information:    
Interest paid 326 17
Income taxes paid 359 24
Supplemental disclosure of non-cash information:    
Conversions of preferred stock to common stock 1,023 742
Down round feature adjustments related to preferred stock 7,057 5,657
Equity transferred to warrant liabilities 0 3,825
Common stock warrant modification recorded as debt discount 113 0
Warrant liabilities transferred to equity 169 0
Addition of operating lease, right-of-use asset 0 2,039
Series C Preferred Stock [Member]    
Financing activities:    
Proceeds from issuance of Series C Preferred Stock and November 2022 Warrants, net 0 3,035
Convertible Notes and May 2023 Warrants [Member]    
Financing activities:    
Proceeds from issuance of Secured Convertible Notes and May 2023 Warrants, net of discounts 3,000 0
Warrant Liability [Member]    
Supplemental disclosure of non-cash information:    
Warrant liabilities transferred to equity $ 1,360 $ 9,353