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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]        
REVENUES $ 4,709 $ 4,760 $ 14,060 $ 13,730
COST OF REVENUES (424) (428) (1,303) (1,112)
Gross profit 4,285 4,332 12,757 12,618
OPERATING EXPENSES        
Selling, general and administrative 4,018 3,677 11,562 11,609
Research and development 1,177 1,550 2,829 4,134
Total operating expenses 5,195 5,227 14,391 15,743
Loss from operations (910) (895) (1,634) (3,125)
OTHER INCOME        
Interest and other income 73 179 230 181
Total other income 73 179 230 181
Net loss before provision for income taxes (837) (716) (1,404) (2,944)
Provision for income taxes 0 8 2 20
Net loss $ (837) $ (724) $ (1,406) $ (2,964)
Loss per common share -        
Basic (in dollars per share) $ (0.04) $ (0.04) $ (0.07) $ (0.15)
Diluted (in dollars per share) $ (0.04) $ (0.04) $ (0.07) $ (0.15)
Weighted average common shares used in computing per share amounts -        
Basic (in shares) 19,499,174 19,278,295 19,390,258 19,209,620
Diluted (in shares) 19,499,174 19,278,295 19,390,258 19,209,620