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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net loss $ (2,001,000) $ (5,182,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 334,000 267,000
Stock based compensation expense 10,000 10,000
Amortization of debt discount/premium, net 1,052,000 3,472,000
Loss on retirement of debt 0 239,000
Reserve for excess and slow-moving inventories 27,000 70,000
Accounts receivable (199,000) 271,000
Inventories 133,000 58,000
Prepaid expenses and other assets 46,000 778,000
Accounts payable 41,000 748,000
Interest payable – related party 75,000 (1,103,000)
Accrued payroll and related expenses 22,000 45,000
Deferred revenue – short-term 351,000 (53,000)
Other current liabilities (211,000) 53,000
Long-term deferred revenue and other noncurrent liabilities (185,000) (288,000)
Net cash used in operating activities (505,000) (615,000)
Reserve for excess and slow-moving inventories 27,000 70,000
Net Cash Provided by (Used in) Investing Activities [Abstract]    
Capital expenditures (20,000) (771,000)
Net cash used in investing activities (20,000) (771,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]    
Proceeds from sale of common stock, net 99,000 2,640,000
Payment on convertible promissory note 398,000  
Proceeds from exercise of warrants and pre-funded warrants 0 421,000
Net cash provided by financing activities (299,000) 3,061,000
Net increase (decrease) in cash and cash equivalents (824,000) 1,675,000
Cash and cash equivalents at beginning of period 2,000,000 4,177,000
Cash and cash equivalents at end of period 1,176,000 5,852,000
Supplemental Cash Flow Information [Abstract]    
Cash paid for interest 102,000 140,000
Cash paid for related party interest 317,000 1,492,000
Convertible note price reset   43,000
Related Party Convertible Debt Price Reset [Member]    
Supplemental Cash Flow Information [Abstract]    
Convertible note price reset 2,789,000 3,160,000
Nonrelated Party [Member]    
Supplemental Cash Flow Information [Abstract]    
Convertible note price reset 37,000 43,000
Promissory note converted to common stock 0 603,000
Related Party [Member]    
Supplemental Cash Flow Information [Abstract]    
Convertible note price reset 2,789,000  
Promissory note converted to common stock 1,563,000 0
January 2023 Convertible Note [Member]    
Supplemental Cash Flow Information [Abstract]    
Fair value of amended convertible note issued in connection with the extinguishment of original convertible note $ 0 $ 1,239,000