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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 2,599,000 $ (2,423,000) $ (7,000,000)
Adjustments to reconcile net income to cash used in operating activities:      
Change in fair value of common stock warrant and option liabilities (1,862,000) (593,000)  
Change in fair value of contingent consideration (1,000,000) 0  
Depreciation 13,000 51,000  
Lease amortization 104,000 177,000  
Amortization of note receivable discount (69,000) 0  
Loss on sale of property and equipment 0 2,000  
Gain on sale of intangible assets (750,000) 0  
Stock-based compensation 78,000 138,000  
Impairment of property and equipment 0 36,000  
Changes in operating assets and liabilities:      
Accounts receivable and other receivables (193,000) (246,000)  
Inventories (381,000) 303,000  
Prepaid expenses and other current assets 205,000 275,000  
Accounts payable and accrued expenses (213,000) (678,000)  
Amounts due to related parties 0 17,000  
Operating lease liabilities (119,000) (269,000)  
Net cash used in operating activities (1,588,000) (3,210,000) (9,600,000)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Proceeds from sale of intangible assets 500,000 0  
Proceeds from sale of property and equipment 0 17,000  
Purchases of property and equipment 0 (13,000)  
Net cash provided by investing activities 500,000 4,000  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from ESPP purchases 5,000 5,000  
Net cash provided by financing activities 5,000 5,000  
Net decrease in cash and cash equivalents (1,083,000) (3,201,000)  
Cash and cash equivalents - beginning of period 4,242,000 6,518,000 6,518,000
Cash and cash equivalents - end of period 3,159,000 3,317,000 $ 4,242,000
NONCASH INVESTING AND FINANCING ACTIVITIES:      
Proceeds from sale of property and equipment in accounts receivable and other receivables 0 12,000  
Purchases of property and equipment in accounts payable and accrued expenses 0 13,000  
Right of use assets obtained in exchange for new operating lease liabilities 0 86,000  
Proceeds from sale of intangible assets in accounts receivable and other receivables $ 250,000 $ 0