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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Statement [Abstract]        
REVENUES $ 4,672 $ 4,716 $ 9,352 $ 8,970
COST OF REVENUES (444) (352) (879) (684)
Gross profit 4,228 4,364 8,473 8,286
OPERATING EXPENSES        
Selling, general and administrative 3,608 3,937 7,544 7,931
Research and development 835 1,276 1,653 2,584
Total operating expenses 4,443 5,213 9,197 10,515
Loss from operations (215) (849) (724) (2,229)
OTHER INCOME        
Interest and other income 88 0 157 1
Total other income 88 0 157 1
Net loss before provision for income taxes (127) (849) (567) (2,228)
Provision for income taxes 0 4 2 12
Net loss $ (127) $ (853) $ (569) $ (2,240)
Loss per common share -        
Basic (in dollars per share) $ (0.01) $ (0.04) $ (0.03) $ (0.12)
Diluted (in dollars per share) $ (0.01) $ (0.04) $ (0.03) $ (0.12)
Weighted average common shares used in computing per share amounts -        
Basic (in shares) 19,460,351 19,120,327 19,380,605 19,168,534
Diluted (in shares) 19,460,351 19,120,327 19,380,605 19,168,534