CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Jan. 01, 2021	Jan. 03, 2020
Income Statement [Abstract]
Net sales		$ 230,472	$ 163,460	$ 150,185
Cost of sales		51,835	45,098	38,231
Gross profit		178,637	118,362	111,954
Selling, general and administrative expenses:
General and administrative		44,142	33,911	29,313
Selling and marketing		67,294	45,764	45,491
Research and development		33,862	31,918	25,298
Total selling, general and administrative expenses		145,298	111,593	100,102
Operating income		33,339	6,769	11,852
Other income (expense), net:
Interest income (expense), net		(38)	238	988
Gain (loss) on foreign currency transactions	[1]	(2,964)	864	(517)
Royalty income		1,015	440	551
Other income (loss), net		(48)	(44)	152
Total other income (expenses), net		(2,035)	1,498	1,174
Income before income taxes		31,304	8,267	13,026
Provision (benefit) for income taxes		6,803	2,354	(1,022)
Net income		$ 24,501	$ 5,913	$ 14,048
Net income per share:
Basic		$ 0.52	$ 0.13	$ 0.32
Diluted		$ 0.50	$ 0.12	$ 0.30
Weighted average shares outstanding:
Basic		47,210	45,605	44,493
Diluted		49,456	47,953	46,895

[1] Shown as a separate line item on the Consolidated Statements of Income.