Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Net sales		$ 107,680	$ 104,701	$ 204,477	$ 212,315
Cost and expenses:
Cost of sales (1)	[1]	60,571	57,779	115,051	116,144
Research and development		23,188	21,342	46,340	43,678
Selling, general and administrative		29,866	32,118	59,877	67,200
Amortization of purchased intangible assets		10,081	9,748	19,933	19,543
Restructuring charges		1,210	13	7,838	22
Costs and Expenses		124,916	121,000	249,039	246,587
Loss from operations		(17,236)	(16,299)	(44,562)	(34,272)
Other (expense) income:
Interest expense		(126)	(144)	(324)	(433)
Interest income		1,386	2,333	2,999	5,042
Foreign transaction loss		(385)	(373)	(440)	(914)
Pension curtailment gain		1,530	0	1,530	0
Loss on extinguishment of debt		0	0	0	(241)
Loss before taxes		(14,831)	(14,483)	(40,797)	(30,818)
Income tax provision (benefit)		2,049	1,286	6,887	(414)
Net loss		$ (16,880)	$ (15,769)	$ (47,684)	$ (30,404)
Loss per share:
Basic (in dollars per share)		$ (0.36)	$ (0.34)	$ (1.02)	$ (0.65)
Diluted (in dollars per share)		$ (0.36)	$ (0.34)	$ (1.02)	$ (0.65)
Weighted average shares used in computing loss per share:
Basic (in shares)		46,662	46,965	46,653	47,049
Diluted (in shares)		46,662	46,965	46,653	47,049

[1] Excludes amortization of purchased intangibles of $7,739 and $7,486 for the three months ended June 28, 2025, and June 29, 2024, respectively, and $15,298 and $15,008 for the six months ended June 28, 2025, and June 29, 2024, respectively.