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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Sales $ 17,297 $ 11,446 $ 34,674 $ 22,662
Cost of goods sold 9,998 6,052 20,478 11,943
Gross profit 7,299 5,394 14,196 10,719
Operating expenses:        
Research and development 2,726 2,224 5,432 4,642
Sales and marketing 2,489 1,379 4,928 2,918
General and administrative 3,261 2,389 6,894 5,067
Change in fair value of contingent consideration 1,557 0 1,557 0
Total operating expenses 10,033 5,992 18,811 12,627
Loss from operations (2,734) (598) (4,615) (1,908)
Other expense (income):        
Interest income, net (7) (47) (15) (171)
Other expense 9 11 16 11
Total other expense (income) 2 (36) 1 (160)
Loss before income taxes (2,736) (562) (4,616) (1,748)
Provision (benefit) for income taxes (127) 174 (2,244) 190
Net loss $ (2,609) $ (736) $ (2,372) $ (1,938)
Net loss per share:        
Basic $ (0.26) $ (0.08) $ (0.24) $ (0.20)
Diluted $ (0.26) $ (0.08) $ (0.24) $ (0.20)
Weighted average shares used in calculating loss per share:        
Basic 10,026 9,683 9,948 9,686
Diluted 10,026 9,683 9,948 9,686