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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

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