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Operating Segments and Enterprise-Wide Information - Revenue by Segment, Recognition Type, and Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 27, 2025
Sep. 28, 2024
Disaggregation of Revenue [Line Items]        
Revenues $ 202,676 $ 207,917 $ 569,830 $ 574,116
Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 166,380 172,174 465,008 475,667
Systems        
Disaggregation of Revenue [Line Items]        
Revenues 36,296 35,743 104,822 98,449
Taiwan        
Disaggregation of Revenue [Line Items]        
Revenues 46,911 47,922 145,152 122,612
Taiwan | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 35,917 42,105 123,478 109,476
Taiwan | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 10,994 5,817 21,674 13,136
United States        
Disaggregation of Revenue [Line Items]        
Revenues 36,375 55,015 117,624 148,672
United States | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 26,802 45,015 87,435 120,046
United States | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 9,573 10,000 30,189 28,626
China        
Disaggregation of Revenue [Line Items]        
Revenues 11,665 34,513 34,680 75,213
China | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 7,760 27,367 20,545 56,364
China | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 3,905 7,146 14,135 18,849
South Korea        
Disaggregation of Revenue [Line Items]        
Revenues 70,802 41,728 171,102 141,552
South Korea | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 68,644 40,870 166,689 140,233
South Korea | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 2,158 858 4,413 1,319
Malaysia        
Disaggregation of Revenue [Line Items]        
Revenues 5,814 5,280 13,569 13,745
Malaysia | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 5,633 4,458 13,297 11,150
Malaysia | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 181 822 272 2,595
Japan        
Disaggregation of Revenue [Line Items]        
Revenues 11,385 8,056 36,370 24,209
Japan | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 8,406 3,734 20,665 12,594
Japan | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 2,979 4,322 15,705 11,615
Europe        
Disaggregation of Revenue [Line Items]        
Revenues 7,363 7,756 22,392 25,420
Europe | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 2,441 2,149 9,200 8,927
Europe | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 4,922 5,607 13,192 16,493
Singapore        
Disaggregation of Revenue [Line Items]        
Revenues 9,937 5,475 22,865 14,755
Singapore | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 8,697 4,726 19,057 12,354
Singapore | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 1,240 749 3,808 2,401
Rest of World        
Disaggregation of Revenue [Line Items]        
Revenues 2,424 2,172 6,076 7,938
Rest of World | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 2,080 1,750 4,642 4,523
Rest of World | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 344 422 1,434 3,415
Products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues 198,222 201,260 555,073 559,306
Products transferred at a point in time | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 164,573 166,968 459,846 464,668
Products transferred at a point in time | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 33,649 34,292 95,227 94,638
Products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenues 4,454 6,657 14,757 14,810
Products and services transferred over time | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 1,807 5,206 5,162 10,999
Products and services transferred over time | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 2,647 1,451 9,595 3,811
Foundry & Logic        
Disaggregation of Revenue [Line Items]        
Revenues 92,933 107,446 277,718 297,874
Foundry & Logic | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 92,933 107,446 277,718 297,874
Foundry & Logic | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
DRAM        
Disaggregation of Revenue [Line Items]        
Revenues 68,182 60,184 174,097 164,122
DRAM | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 68,182 60,184 174,097 164,122
DRAM | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Flash        
Disaggregation of Revenue [Line Items]        
Revenues 5,265 4,544 13,193 13,671
Flash | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 5,265 4,544 13,193 13,671
Flash | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Systems        
Disaggregation of Revenue [Line Items]        
Revenues 36,296 35,743 104,822 98,449
Systems | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Systems | Systems        
Disaggregation of Revenue [Line Items]        
Revenues $ 36,296 $ 35,743 $ 104,822 $ 98,449