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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. 28, 2024 | Sep. 30, 2023 | Sep. 28, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 207,917 | $ 171,575 | $ 574,116 | $ 494,939
Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 172,174 | 128,339 | 475,667 | 370,970
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,743 | 43,236 | 98,449 | 123,969
Taiwan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47,922 | 42,975 | 122,612 | 112,816
Taiwan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,105 | 39,155 | 109,476 | 103,368
Taiwan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,817 | 3,820 | 13,136 | 9,448
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,015 | 43,725 | 148,672 | 124,129
United States | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45,015 | 31,182 | 120,046 | 86,954
United States | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,000 | 12,543 | 28,626 | 37,175
China |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,513 | 21,750 | 75,213 | 72,357
China | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27,367 | 10,779 | 56,364 | 45,771
China | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,146 | 10,971 | 18,849 | 26,586
South Korea |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 41,728 | 35,075 | 141,552 | 83,713
South Korea | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,870 | 31,805 | 140,233 | 77,832
South Korea | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 858 | 3,270 | 1,319 | 5,881
Malaysia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,280 | 5,964 | 13,745 | 23,911
Malaysia | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,458 | 5,778 | 11,150 | 22,279
Malaysia | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 822 | 186 | 2,595 | 1,632
Japan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,056 | 6,964 | 24,209 | 25,873
Japan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,734 | 2,976 | 12,594 | 14,014
Japan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,322 | 3,988 | 11,615 | 11,859
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,756 | 9,296 | 25,420 | 29,538
Europe | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,149 | 2,583 | 8,927 | 8,424
Europe | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,607 | 6,713 | 16,493 | 21,114
Singapore |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,475 | 3,677 | 14,755 | 11,840
Singapore | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,726 | 2,752 | 12,354 | 7,670
Singapore | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 749 | 925 | 2,401 | 4,170
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,172 | 2,149 | 7,938 | 10,762
Rest of World | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,750 | 1,329 | 4,523 | 4,658
Rest of World | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 422 | 820 | 3,415 | 6,104
Products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 201,260 | 169,507 | 559,306 | 485,920
Products transferred at a point in time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 166,968 | 127,731 | 464,668 | 368,939
Products transferred at a point in time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,292 | 41,776 | 94,638 | 116,981
Products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,657 | 2,068 | 14,810 | 9,019
Products and services transferred over time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,206 | 608 | 10,999 | 2,031
Products and services transferred over time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,451 | 1,460 | 3,811 | 6,988
Foundry & Logic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 107,446 | 96,366 | 297,874 | 279,895
Foundry & Logic | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 107,446 | 96,366 | 297,874 | 279,895
Foundry & Logic | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
DRAM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 60,184 | 27,478 | 164,122 | 77,832
DRAM | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 60,184 | 27,478 | 164,122 | 77,832
DRAM | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Flash |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,544 | 4,495 | 13,671 | 13,243
Flash | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,544 | 4,495 | 13,671 | 13,243
Flash | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,743 | 43,236 | 98,449 | 123,969
Systems | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 35,743 | $ 43,236 | $ 98,449 | $ 123,969

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