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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues:        
Total revenues $ 1,302,000 $ 1,537,000 $ 3,957,000 $ 3,829,000
Operating expenses (income):        
Cost of revenues 884,000 1,032,000 2,389,000 2,136,000
Research and development 0 24,000 9,000 40,000
Gain on sale of intangible assets 0 0 (750,000) (4,000,000)
Impairment of property and equipment 0 0 0 36,000
Change in fair value of contingent consideration 0 0 (2,000,000) 0
Selling, general and administrative 1,570,000 2,241,000 5,434,000 6,986,000
Total operating expenses 2,454,000 3,297,000 5,082,000 5,198,000
Loss from operations (1,152,000) (1,760,000) (1,125,000) (1,369,000)
Interest income 7,000 233,000 222,000 428,000
Credit loss (257,000) 0 (4,745,000) 0
Other income 1,698,000 15,000 2,770,000 168,000
Change in fair value of common stock warrant and option liabilities 560,000 330,000 1,875,000 493,000
Net income (loss) from continuing operations 856,000 (1,182,000) (1,003,000) (280,000)
Net loss from discontinued operations 0 (430,000) 0 (2,694,000)
Net income (loss) attributable to common stockholders $ 856,000 $ (1,612,000) $ (1,003,000) $ (2,974,000)
Net income (loss) per share attributable to common stockholders:        
Basic net income (loss) per share attributable to common stockholders from continuing operations $ 0.63 $ (0.87) $ (0.73) $ (0.21)
Basic net income (loss) per share attributable to common stockholders from discontinued operations 0 (0.32) (0) (1.98)
Net income (loss) per basic share attributable to common stockholders 0.63 (1.18) (0.73) (2.18)
Diluted net income (loss) per share attributable to common stockholders from continuing operations 0.62 (0.87) (0.73) (0.21)
Diluted net income (loss) per share attributable to common stockholders from discontinued operations 0 (0.32) (0) (1.98)
Net income (loss) per diluted share attributable to common stockholders $ 0.62 $ (1.18) $ (0.73) $ (2.18)
Weighted-average number of shares used in per share calculations:        
Weighted average shares - Basic 1,367,192 1,363,753 1,366,768 1,362,754
Weighted average shares - Diluted 1,371,879 1,363,753 1,366,768 1,362,754
Other comprehensive income, net of tax        
Unrealized gains on available-for-sale securities $ 0 $ 36,000 $ 0 $ 117,000
Reclassification adjustment for gains on available-for-sale securities included in net income (loss) 0 0 0 (111,000)
Change in unrealized gains on available-for-sale securities 0 36,000 0 6,000
Comprehensive income (loss) 856,000 (1,576,000) (1,003,000) (2,968,000)
Product        
Revenues:        
Total revenues $ 1,302,000 $ 1,537,000 $ 3,957,000 $ 3,829,000