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Condensed Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Sales $ 11,446 $ 14,462 $ 22,662 $ 29,570
Cost of goods sold 6,052 7,777 11,943 16,100
Gross profit 5,394 6,685 10,719 13,470
Operating expenses:        
Research and development 2,224 2,203 4,642 4,541
Sales and marketing 1,379 2,229 2,918 4,503
General and administrative 2,389 1,757 5,067 3,752
Total operating expenses 5,992 6,189 12,627 12,796
Income (loss) from operations (598) 496 (1,908) 674
Other expense (income):        
Interest income, net (47) (189) (171) (376)
Other expense 11   11  
Total other income (36) (189) (160) (376)
Income (loss) before income taxes (562) 685 (1,748) 1,050
Provision for income taxes 174 23 190 52
Net income (loss) $ (736) $ 662 $ (1,938) $ 998
Net income (loss) per share:        
Basic $ (0.08) $ 0.07 $ (0.20) $ 0.10
Diluted $ (0.08) $ 0.07 $ (0.20) $ 0.10
Weighted average shares used in calculating income (loss) per share:        
Basic 9,683 9,697 9,686 9,661
Diluted 9,683 10,128 9,686 10,071