Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 105,570	$ 90,277	$ 315,666	$ 253,458
Cost of goods sold	49,524	43,052	150,440	118,999
Gross profit	56,046	47,225	165,226	134,459
Operating expenses:
Selling expenses	24,908	19,155	72,945	55,445
General and administrative expenses	26,518	26,069	79,469	57,806
Operating expenses	51,426	45,224	152,414	113,251
Operating income	4,620	2,001	12,812	21,208
Interest expense	(119)	(142)	(710)	(329)
Other income (expense), net	209	(615)	(802)	(15)
Income before income taxes	4,292	2,474	12,904	20,894
Income tax expense	636	736	2,717	6,004
Net income	$ 3,656	$ 1,738	$ 10,187	$ 14,890
Basic income per share of common stock (in USD per share)	$ 0.40	$ 0.19	$ 1.12	$ 1.65
Diluted income per share of common stock (in USD per share)	$ 0.39	$ 0.19	$ 1.09	$ 1.60
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	9,078	9,017	9,073	9,017
Effect of dilutive securities outstanding (in shares)	279	313	273	312
Diluted weighted average shares outstanding (in shares)	9,357	9,330	9,346	9,329
Comprehensive income:
Net income	$ 3,656	$ 1,738	$ 10,187	$ 14,890
Adjustment for foreign currency translation	(928)	398	57	(918)
Net comprehensive income	$ 2,728	$ 2,136	$ 10,244	$ 13,972