CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Income Statement [Abstract]
Net sales	$ 63,200	$ 50,752
Cost of sales	13,936	11,610
Gross profit	49,264	39,142
Selling, general and administrative expenses:
General and administrative	11,940	10,212
Selling and marketing	17,270	13,201
Research and development	7,941	8,259
Total selling, general and administrative expenses	37,151	31,672
Operating income	12,113	7,470
Other expense, net:
Interest expense, net	(6)	(7)
Loss on foreign currency transactions	(915)	(1,299)
Royalty income	273	160
Other income (expense), net	62	(85)
Total other expense, net	(586)	(1,231)
Income before income taxes	11,527	6,239
Provision for income taxes	1,925	1,247
Net income	$ 9,602	$ 4,992
Net income per share:
Basic	$ 0.20	$ 0.11
Diluted	$ 0.19	$ 0.10
Weighted average shares outstanding:
Basic	47,755	46,617
Diluted	49,288	49,213