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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (4,293) $ (10,279)
Adjustments to reconcile net loss to net cash used in operating activities:    
Other income (40) (30)
Capitalized interest on promissory notes payable 0 40
Depreciation 33 159
Stock-based compensation 44 117
Provision for doubtful accounts receivable 6 14
Provision for slow-moving and obsolete inventories 25 32
Provision for warranties (33) (111)
Amortization of loan discounts and origination fees 225 364
Loss on impairment 0 338
Change in operating assets and liabilities:    
Inventories 1,012 2,358
Prepayments to vendors (200) 120
Prepaid and other assets 521 247
Accrued and other liabilities (47) (584)
Right of use assets and lease liabilities 75 (12)
Deferred revenue 0 (268)
Total adjustments 1,854 3,566
Net cash used in operating activities (2,439) (6,713)
Cash flows from investing activities:    
Acquisitions of property and equipment (69) (41)
Proceeds from the sale of property and equipment 0 25
Net cash used in investing activities (69) (16)
Cash flows from financing activities:    
Proceeds from the issuance of common stock and warrants 6,079 3,500
Costs related to reverse stock-split (16) 0
Offering costs paid on the issuance of common stock and warrants 0 (334)
Principal payments under finance lease obligations 0 (1)
Proceeds from exercise of stock options and purchases through employee stock purchase plan 0 6
Proceeds from related party promissory notes payable 0 800
Payments for deferred financing costs 0 (114)
Net payments on credit line borrowings - Credit Facilities (1,402) (768)
Advanced capital contribution 450 0
Net cash provided by financing activities 4,486 4,099
Net increase (decrease) in cash 1,978 (2,630)
Cash, beginning of year 52 2,682
Cash, end of year 2,030 52
Supplemental information:    
Cash paid in year for interest 380 364
Cash paid in year for income taxes 0 1
Non-cash investing and financing activities:    
Debt-to-equity exchange transactions 1,716 304
Nonrelated Party    
Change in operating assets and liabilities:    
Accounts receivable (1,131) 783
Accounts payable (580) (1)
Related Party    
Change in operating assets and liabilities:    
Accounts receivable (202) 0
Accounts payable 2,146 0
2021 Streeterville Note    
Cash flows from financing activities:    
Payments on the Note 0 (1,640)
2022 Streeterville Note    
Cash flows from financing activities:    
Payments on the Note (625) 0
Proceeds from notes payable 0 2,000
Promissory Note Payable    
Cash flows from financing activities:    
Proceeds from notes payable $ 0 $ 650