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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 6 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Disaggregation of Revenue [Line Items]        
Revenues $ 197,474 $ 155,916 $ 366,199 $ 323,364
Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 166,792 115,303 303,493 242,631
Systems        
Disaggregation of Revenue [Line Items]        
Revenues 30,682 40,613 62,706 80,733
Taiwan        
Disaggregation of Revenue [Line Items]        
Revenues 44,813 29,512 74,690 69,841
Taiwan | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 40,192 25,316 67,371 64,213
Taiwan | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 4,621 4,196 7,319 5,628
United States        
Disaggregation of Revenue [Line Items]        
Revenues 47,891 42,673 93,657 80,404
United States | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 39,435 31,131 75,031 55,772
United States | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 8,456 11,542 18,626 24,632
China        
Disaggregation of Revenue [Line Items]        
Revenues 25,087 23,508 40,700 50,607
China | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 20,311 16,516 28,997 34,992
China | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 4,776 6,992 11,703 15,615
South Korea        
Disaggregation of Revenue [Line Items]        
Revenues 49,107 27,863 99,824 48,638
South Korea | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 48,691 26,455 99,363 46,027
South Korea | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 416 1,408 461 2,611
Malaysia        
Disaggregation of Revenue [Line Items]        
Revenues 6,602 6,677 8,465 17,947
Malaysia | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 5,084 6,177 6,692 16,501
Malaysia | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 1,518 500 1,773 1,446
Japan        
Disaggregation of Revenue [Line Items]        
Revenues 7,611 7,932 16,153 18,909
Japan | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 4,513 3,902 8,860 11,038
Japan | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 3,098 4,030 7,293 7,871
Europe        
Disaggregation of Revenue [Line Items]        
Revenues 8,815 10,816 17,664 20,242
Europe | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 3,250 2,415 6,778 5,841
Europe | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 5,565 8,401 10,886 14,401
Singapore        
Disaggregation of Revenue [Line Items]        
Revenues 4,522 2,823 9,280 8,163
Singapore | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 4,112 1,718 7,628 4,918
Singapore | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 410 1,105 1,652 3,245
Rest of World        
Disaggregation of Revenue [Line Items]        
Revenues 3,026 4,112 5,766 8,613
Rest of World | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 1,204 1,673 2,773 3,329
Rest of World | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 1,822 2,439 2,993 5,284
Products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues 193,621 153,025 358,046 316,413
Products transferred at a point in time | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 165,492 112,985 301,133 236,903
Products transferred at a point in time | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 28,129 40,040 56,913 79,510
Products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenues 3,853 2,891 8,153 6,951
Products and services transferred over time | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 1,300 2,318 2,360 5,728
Products and services transferred over time | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 2,553 573 5,793 1,223
Foundry & Logic        
Disaggregation of Revenue [Line Items]        
Revenues 103,660 81,967 190,428 183,529
Foundry & Logic | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 103,660 81,967 190,428 183,529
Foundry & Logic | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
DRAM        
Disaggregation of Revenue [Line Items]        
Revenues 58,042 30,464 103,938 50,354
DRAM | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 58,042 30,464 103,938 50,354
DRAM | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Flash        
Disaggregation of Revenue [Line Items]        
Revenues 5,090 2,872 9,127 8,748
Flash | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 5,090 2,872 9,127 8,748
Flash | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Systems        
Disaggregation of Revenue [Line Items]        
Revenues 30,682 40,613 62,706 80,733
Systems | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Systems | Systems        
Disaggregation of Revenue [Line Items]        
Revenues $ 30,682 $ 40,613 $ 62,706 $ 80,733