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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 24, 2022
Sep. 25, 2021
Sep. 24, 2022
Sep. 25, 2021
Segment Reporting Information [Line Items]        
Revenues $ 180,869 $ 189,964 $ 581,950 $ 564,676
Gross profit $ 62,213 $ 80,219 $ 250,806 $ 233,208
Gross margin 34.40% 42.20% 43.10% 41.30%
Probe Cards        
Segment Reporting Information [Line Items]        
Revenues $ 139,365 $ 154,850 $ 467,056 $ 467,389
Systems        
Segment Reporting Information [Line Items]        
Revenues 41,504 35,114 114,894 97,287
Operating segments | Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 139,365 154,850 467,056 467,389
Gross profit $ 48,252 $ 69,868 $ 203,874 $ 206,783
Gross margin 34.60% 45.10% 43.70% 44.20%
Operating segments | Systems        
Segment Reporting Information [Line Items]        
Revenues $ 41,504 $ 35,114 $ 114,894 $ 97,287
Gross profit $ 22,284 $ 17,553 $ 59,967 $ 48,059
Gross margin 53.70% 50.00% 52.20% 49.40%
Operating segments | Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues $ 0 $ 0 $ 0 $ 0
Gross profit $ (8,323) $ (7,202) $ (13,035) $ (21,634)
Gross margin