Condensed Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 112,428	$ 110,985	$ 339,415	$ 288,943
Cost of sales	28,307	26,243	81,660	72,818
Gross profit	84,121	84,742	257,755	216,125
Sales and marketing	56,097	52,926	164,220	150,718
General and administrative	16,312	16,541	51,091	49,453
Research and development	12,360	9,962	36,378	28,691
Acquisition-related amortization and remeasurement (Note 12)	(335)	1,138	5,028	(2,766)
Operating income (loss)	(313)	4,175	1,038	(9,971)
Interest expense, net	(433)	(731)	(1,400)	(2,055)
Other income (expense), net	(1,789)	1,817	(3,528)	6,088
Income (loss) before income taxes	(2,535)	5,261	(3,890)	(5,938)
Income tax benefit (expense)	364	(607)	(1,677)	17,833
Net income (loss)	$ (2,171)	$ 4,654	$ (5,567)	$ 11,895
Net income (loss) per common share:
Basic	$ (0.11)	$ 0.24	$ (0.28)	$ 0.62
Diluted	$ (0.11)	$ 0.24	$ (0.28)	$ 0.61
Weighted average number of common shares:
Basic	19,769,823	19,335,718	19,633,782	19,217,057
Diluted	19,769,823	19,398,567	19,633,782	19,319,302
Other comprehensive income (loss), before tax
Unrealized gain (loss) on debt securities	$ 513		$ (115)
Currency translation adjustment	(719)	$ 2,275	(1,901)	$ 2,048
Other comprehensive income (loss), before tax	(206)	2,275	(2,016)	2,048
Income tax benefit (expense) related to other comprehensive income (loss)	(128)		28
Other comprehensive income (loss), net of tax	(334)	2,275	(1,988)	2,048
Comprehensive income (loss)	$ (2,505)	$ 6,929	$ (7,555)	$ 13,943