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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net loss $ (5,532) $ (2,402) [1]
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of property and equipment 39 88
Amortization of intangible assets 114 272
Non-cash loss on modification of common stock warrants 285 1,922
Non-cash gain on changes in fair value of warrant liability (216) (4,470)
Non-cash gain on changes in fair value of combined derivative liability (40) (0)
Non-cash gain on changes in fair value of contingent liability 0 (219)
Accretion of interest and amortization of debt discounts on convertible notes 1,119 0
Changes in operating assets and liabilities:    
Accounts receivable 1,057 (465)
Inventory (56) (848)
Prepaid expenses and other current assets 227 234
Operating lease right-of-use assets 305 (1,526)
Other assets (20) (1)
Accounts payable and accrued liabilities (988) 128
Operating lease liabilities (312) 1,712
Net cash used in operating activities (3,817) (5,445)
Investing activities:    
Purchases of property and equipment (17) (112)
Net cash used in investing activities (17) (112)
Financing activities:    
Proceeds from convertible notes and warrant issuances, net of discount 3,000 0
Payment on the convertible notes (770) 0
Debt issuance cost (294) 0
Proceeds from the exercise of warrants 0 1,703
Payment on the line of credit 0 (105)
Net cash provided by financing activities 1,936 1,598
Net change in cash, cash equivalents, and restricted cash (1,898) (3,959)
Cash, cash equivalents and restricted cash, beginning of year 5,846 7,979
Cash, cash equivalents and restricted cash, end of period 3,948 4,020
Supplemental disclosure of cash flow information:    
Interest paid 189 12
Supplemental disclosure of non-cash information:    
Derivative liability transferred to equity 169 0
Equity transferred to warrant liability 0 3,825
Addition of operating lease, right-of-use asset 0 2,039
Reassessment of operating lease, right-of-use asset 0 164
Series B Preferred Stock [Member]    
Supplemental disclosure of non-cash information:    
Adjustment of Preferred Stock conversion price 1,802 5,657
Series C Preferred Stock [Member]    
Supplemental disclosure of non-cash information:    
Adjustment of Preferred Stock conversion price 194 0
Employees and Directors [Member]    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense related to employee and director stock awards 201 130
Conversion of Series B Preferred Stock to Common Stock [Member]    
Supplemental disclosure of non-cash information:    
Conversion of Preferred Stock to common stock 268 110
Conversion of Series C Preferred Stock to Common Stock [Member]    
Supplemental disclosure of non-cash information:    
Conversion of Preferred Stock to common stock 728 0
Warrant Liability [Member]    
Supplemental disclosure of non-cash information:    
Derivative liability transferred to equity $ 1,360 $ 7,502
[1] After giving retroactive effect to a 1-for-35 reverse stock split that became effective November 15, 2022.