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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Net sales $ 109,112 $ 108,709
Cost of sales 23,708 24,147
Gross profit 85,404 84,562
Sales and marketing 53,694 50,268
General and administrative 20,472 19,424
Research and development 9,229 6,937
Acquisition-related amortization and remeasurement (Note 13) 6,457 63
Operating income (loss) (4,448) 7,870
Interest expense, net (257) (183)
Other income (expense), net (404) 2,912
Income (loss) before income taxes (5,109) 10,599
Income tax benefit (expense) 6,006 (5,373)
Net income $ 897 $ 5,226
Net income per common share:    
Basic $ 0.05 $ 0.28
Diluted $ 0.05 $ 0.27
Weighted average number of common shares:    
Basic 18,750,184 18,404,856
Diluted 19,191,146 18,874,591
Other comprehensive income (loss), before tax    
Unrealized loss on debt securities $ (2,593)  
Currency translation adjustment (449) $ 697
Other comprehensive income (loss) before tax (3,042) 697
Income tax related to items of other comprehensive income (loss) 641  
Other comprehensive income (loss), net of tax (2,401) 697
Comprehensive income (loss) $ (1,504) $ 5,923