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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
REVENUES $ 4,716 $ 4,008 $ 8,970 $ 7,403
COST OF REVENUES (352) (364) (684) (680)
Gross profit 4,364 3,644 8,286 6,723
OPERATING EXPENSES        
Selling, general and administrative 3,861 3,124 7,784 6,068
Research and development 1,276 1,618 2,584 3,221
Total operating expenses 5,137 4,742 10,368 9,289
Loss from operations (773) (1,098) (2,082) (2,566)
OTHER INCOME        
Interest and other income 0 0 1 0
Total other income 0 0 1 0
Net loss before provision for income taxes (773) (1,098) (2,081) (2,566)
Provision for income taxes 4 0 12 0
Net loss $ (777) $ (1,098) $ (2,093) $ (2,566)
Loss per common share -        
Basic (in dollars per share) $ (0.04) $ (0.06) $ (0.11) $ (0.14)
Diluted (in dollars per share) $ (0.04) $ (0.06) $ (0.11) $ (0.14)
Weighted average common shares used in computing per share amounts -        
Basic (in shares) 19,120,327 18,812,418 19,168,534 18,736,736
Diluted (in shares) 19,120,327 18,812,418 19,168,534 18,736,736