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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. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 177,996 | $ 140,604 | $ 496,573 | $ 410,835
Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 150,773 | 116,447 | 419,272 | 338,187
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27,223 | 24,157 | 77,301 | 72,648
China |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,546 | 31,383 | 120,946 | 73,581
China | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,851 | 24,427 | 107,756 | 58,882
China | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,695 | 6,956 | 13,190 | 14,699
Taiwan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36,935 | 18,255 | 58,772 | 78,491
Taiwan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,351 | 16,513 | 56,278 | 75,157
Taiwan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,584 | 1,742 | 2,494 | 3,334
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36,328 | 33,665 | 96,365 | 106,297
United States | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31,596 | 28,400 | 79,575 | 88,127
United States | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,732 | 5,265 | 16,790 | 18,170
South Korea |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,571 | 23,597 | 101,886 | 55,514
South Korea | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,337 | 22,779 | 93,596 | 50,596
South Korea | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,234 | 818 | 8,290 | 4,918
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16,979 | 9,548 | 52,154 | 29,689
Europe | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,679 | 5,754 | 36,656 | 15,601
Europe | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,300 | 3,794 | 15,498 | 14,088
Japan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,145 | 16,929 | 23,317 | 16,611
Japan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12,288 | 13,640 | 14,307 | 12,568
Japan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,857 | 3,289 | 9,010 | 4,043
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,954 | 5,665 | 35,574 | 43,454
Asia-Pacific | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,505 | 3,516 | 24,502 | 31,807
Asia-Pacific | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,449 | 2,149 | 11,072 | 11,647
Rest of the world |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,538 | 1,562 | 7,559 | 7,198
Rest of the world | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,166 | 1,418 | 6,602 | 5,449
Rest of the world | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 372 | 144 | 957 | 1,749
Products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 176,239 | 138,885 | 490,922 | 405,885
Products transferred at a point in time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 150,252 | 115,324 | 417,529 | 335,054
Products transferred at a point in time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,987 | 23,561 | 73,393 | 70,831
Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,757 | 1,719 | 5,651 | 4,950
Services transferred over time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 521 | 1,123 | 1,743 | 3,133
Services transferred over time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,236 | 596 | 3,908 | 1,817
Foundry & Logic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108,411 | 68,431 | 323,503 | 213,453
Foundry & Logic | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108,411 | 68,431 | 323,503 | 213,453
Foundry & Logic | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
DRAM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31,379 | 39,425 | 75,127 | 104,355
DRAM | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 31,379 | 39,425 | 75,127 | 104,355
DRAM | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Flash |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,983 | 8,591 | 20,642 | 20,379
Flash | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,983 | 8,591 | 20,642 | 20,379
Flash | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27,223 | 24,157 | 77,301 | 72,648
Systems | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 27,223 | $ 24,157 | $ 77,301 | $ 72,648

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