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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Segment Reporting Information [Line Items]    
Revenues $ 171,356 $ 168,725
Gross profit 64,523 62,738
Cost of revenues $ 106,833 $ 105,987
Gross margin 37.70% 37.20%
Research and development $ 27,800 $ 28,627
Selling Expense 13,027 12,506
Marketing Expense 4,447 5,280
Net Contribution 19,249 16,325
General and Administrative Expense 15,980 15,293
Gain (loss) on disposition of business 0 20,271
Operating Income (Loss) 3,269 21,303
Investment Income, Interest 3,416 3,258
Interest Expense, Operating and Nonoperating (99) (102)
Other income, net 890 520
Income before income taxes 7,476 24,979
Systems    
Segment Reporting Information [Line Items]    
Revenues 34,836 32,024
Probe Cards    
Segment Reporting Information [Line Items]    
Revenues 136,520 136,701
Probe Cards | Systems    
Segment Reporting Information [Line Items]    
Revenues 0 0
Systems    
Segment Reporting Information [Line Items]    
Revenues 34,836 32,024
Systems | Systems    
Segment Reporting Information [Line Items]    
Revenues 34,836 32,024
Operating segments | Probe Cards    
Segment Reporting Information [Line Items]    
Revenues 136,520 136,701
Gross profit 51,615 50,791
Cost of revenues $ 84,905 $ 85,910
Gross margin 37.80% 37.20%
Research and development $ 21,056 $ 20,848
Selling Expense 6,566 7,220
Marketing Expense 1,580 1,918
Net Contribution 22,413 20,805
Operating segments | Systems    
Segment Reporting Information [Line Items]    
Revenues 34,836 32,024
Gross profit 15,515 14,506
Cost of revenues $ 19,321 $ 17,518
Gross margin 44.50% 45.30%
Research and development $ 3,968 $ 5,166
Selling Expense 3,660 3,586
Marketing Expense 1,741 1,660
Net Contribution 6,146 4,094
Corporate and Other    
Segment Reporting Information [Line Items]    
Revenues 0 0
Gross profit (2,607) (2,559)
Cost of revenues 2,607 2,559
Research and development 2,776 2,613
Selling Expense 2,801 1,700
Marketing Expense 1,126 1,702
Net Contribution $ (9,310) $ (8,574)