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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Sales $ 17,377 $ 11,216
Cost of goods sold 10,480 5,891
Gross profit 6,897 5,325
Operating expenses:    
Research and development 2,706 2,418
Sales and marketing 2,439 1,539
General and administrative 3,633 2,678
Total operating expenses 8,778 6,635
Loss from operations (1,881) (1,310)
Other expense (income):    
Interest income, net (8) (124)
Other expense 7 0
Total other income (1) (124)
Loss before income taxes (1,880) (1,186)
Provision (benefit) for income taxes (2,117) 16
Net income (loss) $ 237 $ (1,202)
Net income (loss) per share:    
Basic $ 0.02 $ (0.12)
Diluted $ 0.02 $ (0.12)
Weighted average shares used in calculating income (loss) per share:    
Basic 9,869 9,690
Diluted 10,839 9,690