Condensed Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 121,394	$ 73,135	$ 226,987	$ 177,958
Cost of sales	27,439	23,166	53,353	46,575
Gross profit	93,955	49,969	173,634	131,383
Sales and marketing	57,338	43,479	108,123	97,792
General and administrative	18,335	15,047	34,779	32,912
Research and development	13,121	8,765	24,018	18,729
Acquisition-related amortization and remeasurement (Note 12)	894	3,678	5,363	(3,904)
Operating income (loss)	4,267	(21,000)	1,351	(14,146)
Interest expense, net	(550)	(901)	(967)	(1,324)
Other income (expense), net	951	5,069	(1,739)	4,271
Income (loss) before income taxes	4,668	(16,832)	(1,355)	(11,199)
Income tax benefit (expense)	(2,248)	(1,592)	(2,041)	18,440
Net income (loss)	$ 2,420	$ (18,424)	$ (3,396)	$ 7,241
Net income (loss) per common share:
Basic	$ 0.12	$ (0.96)	$ (0.17)	$ 0.38
Diluted	$ 0.12	$ (0.96)	$ (0.17)	$ 0.37
Weighted average number of common shares:
Basic	19,650,610	19,215,392	19,575,127	19,149,523
Diluted	19,938,392	19,215,392	19,575,127	19,271,467
Other comprehensive income (loss), before tax
Unrealized gain (loss) on debt securities	$ 98		$ (628)
Currency translation adjustment	(155)	$ 1,484	(1,182)	$ (227)
Other comprehensive income (loss), before tax	(57)	1,484	(1,810)	(227)
Income tax related to other comprehensive income (loss)	(24)		156
Other comprehensive income (loss), net of tax	(81)	1,484	(1,654)	(227)
Comprehensive income (loss)	$ 2,339	$ (16,940)	$ (5,050)	$ 7,014