Condensed Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 105,593	$ 104,823
Cost of sales	25,914	23,409
Gross profit	79,679	81,414
Sales and marketing	50,785	54,313
General and administrative	16,444	17,865
Research and development	10,897	9,964
Acquisition-related amortization and remeasurement (Note 12)	4,469	(7,582)
Operating income (loss)	(2,916)	6,854
Interest expense, net	(417)	(423)
Other expense, net	(2,690)	(798)
Income (loss) before income taxes	(6,023)	5,633
Income tax benefit	207	20,032
Net income (loss)	$ (5,816)	$ 25,665
Net income (loss) per common share:
Basic	$ (0.30)	$ 1.33
Diluted	$ (0.30)	$ 1.32
Weighted average number of common shares:
Basic	19,526,872	19,143,934
Diluted	19,526,872	19,299,820
Other comprehensive loss, before tax
Unrealized loss on debt securities	$ (726)
Currency translation adjustment	(1,027)	$ (1,711)
Other comprehensive loss before tax	(1,753)	(1,711)
Income tax related to other comprehensive loss	180
Other comprehensive loss, net of tax	(1,573)	(1,711)
Comprehensive income (loss)	$ (7,389)	$ 23,954