Condensed Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 104,823	$ 109,112
Cost of sales	23,409	23,708
Gross profit	81,414	85,404
Sales and marketing	54,313	53,694
General and administrative	17,865	20,472
Research and development	9,964	9,229
Acquisition-related amortization and remeasurement (Note 13)	(7,582)	6,457
Operating income (loss)	6,854	(4,448)
Interest expense, net	(423)	(257)
Other expense, net	(798)	(404)
Income (loss) before income taxes	5,633	(5,109)
Income tax benefit	20,032	6,006
Net income	$ 25,665	$ 897
Net income per common share:
Basic	$ 1.33	$ 0.05
Diluted	$ 1.32	$ 0.05
Weighted average number of common shares:
Basic	19,143,934	18,750,184
Diluted	19,299,820	19,191,146
Other comprehensive loss, before tax
Unrealized loss on debt security		$ (2,593)
Currency translation adjustment	$ (1,711)	(449)
Other comprehensive loss before tax	(1,711)	(3,042)
Income tax related to other comprehensive loss		641
Other comprehensive loss, net of tax	(1,711)	(2,401)
Comprehensive income (loss)	$ 23,954	$ (1,504)