CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended
	Mar. 28, 2025	Mar. 29, 2024
Income Statement [Abstract]
Net sales	$ 42,589,000	$ 77,356,000
Cost of sales	14,584,000	16,321,000
Gross profit	28,005,000	61,035,000
Selling, general and administrative expenses:
General and administrative	24,458,000	23,228,000
Selling and marketing	24,621,000	26,708,000
Research and development	13,663,000	13,380,000
Restructuring, impairment and related charges	22,664,000
Total selling, general and administrative expenses	85,406,000	63,316,000
Operating loss	(57,401,000)	(2,281,000)
Other income (expense), net:
Interest income, net	1,366,000	1,529,000
Gain (loss) on foreign currency transactions	1,418,000	(2,297,000)
Royalty income		508,000
Other income, net	131,000	330,000
Total other income, net	2,915,000	70,000
Loss before income taxes	(54,486,000)	(2,211,000)
Provision (benefit) for income taxes	(275,000)	1,128,000
Net loss	$ (54,211,000)	$ (3,339,000)
Net loss per share:
Basic	$ (1.1)	$ (0.07)
Diluted	$ (1.1)	$ (0.07)
Weighted average shares outstanding:
Basic	49,344	48,907
Diluted	49,344	48,907