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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Segment Reporting Information [Line Items]        
Revenues $ 195,798 $ 197,474 $ 367,154 $ 366,199
Cost of revenues 122,860 110,574 229,693 216,561
Gross profit $ 72,938 $ 86,900 $ 137,461 $ 149,638
Gross margin 37.30% 44.00% 37.40% 40.90%
Research and development $ 28,793 $ 31,564 $ 56,593 $ 60,191
Selling Expense 11,974 13,894 25,001 26,400
Marketing Expense 4,807 6,492 9,254 11,772
Net Contribution 27,364 34,950 46,613 51,275
General and Administrative Expense 15,058 17,488 31,038 32,781
Gain (loss) on disposition of business 0 310 0 20,581
Operating Income (Loss) 12,306 17,772 15,575 39,075
Other income (expense), net (6) 360 884 880
Income before income taxes 14,942 21,547 22,418 46,526
Interest income, net 2,642 3,415 5,959 6,571
Systems        
Segment Reporting Information [Line Items]        
Revenues 33,690 30,682 68,526 62,706
Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 162,108 166,792 298,628 303,493
Probe Cards | Systems        
Segment Reporting Information [Line Items]        
Revenues 0 0 0 0
Systems        
Segment Reporting Information [Line Items]        
Revenues 33,690 30,682 68,526 62,706
Systems | Systems        
Segment Reporting Information [Line Items]        
Revenues 33,690 30,682 68,526 62,706
Operating segments | Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 162,108 166,792 298,628 303,493
Cost of revenues 100,040 91,553 184,945 177,463
Gross profit $ 62,068 $ 75,239 $ 113,683 $ 126,030
Gross margin 38.30% 45.10% 38.10% 41.50%
Research and development $ 20,974 $ 23,710 $ 42,030 $ 44,558
Selling Expense 7,181 8,353 13,747 15,573
Marketing Expense 1,598 2,907 3,178 4,825
Net Contribution 32,315 40,269 54,728 61,074
Operating segments | Systems        
Segment Reporting Information [Line Items]        
Revenues 33,690 30,682    
Cost of revenues 20,419 16,505 39,740 34,023
Gross profit $ 13,271 $ 14,177 $ 28,786 $ 28,683
Gross margin 39.40% 46.20% 42.00% 45.70%
Research and development $ 5,261 $ 5,240 $ 9,229 $ 10,406
Selling Expense 3,424 4,174 7,084 7,760
Marketing Expense 1,882 1,824 3,623 3,484
Net Contribution 2,704 2,939 8,850 7,033
Operating segments | Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues     0 0
Gross profit     (5,008) (5,075)
Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues 0 0    
Cost of revenues 2,401 2,516 5,008 5,075
Gross profit (2,401) (2,516)    
Research and development 2,558 2,614 5,334 5,227
Selling Expense 1,369 1,367 4,170 3,067
Marketing Expense 1,327 1,761 2,453 3,463
Net Contribution $ (7,655) $ (8,258) $ (16,965) $ (16,832)