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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. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 157,824 | $ 138,018 | $ 318,577 | $ 270,231
Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 133,784 | 113,637 | 268,499 | 221,740
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,040 | 24,381 | 50,078 | 48,491
China |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 48,758 | 20,355 | 92,400 | 42,198
China | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45,625 | 16,304 | 82,905 | 34,455
China | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,133 | 4,051 | 9,495 | 7,743
Taiwan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,171 | 14,872 | 29,201 | 54,894
Taiwan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,806 | 12,826 | 27,941 | 52,378
Taiwan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,365 | 2,046 | 1,260 | 2,516
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,121 | 38,369 | 60,037 | 72,632
United States | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,368 | 32,072 | 47,979 | 59,727
United States | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,753 | 6,297 | 12,058 | 12,905
South Korea |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,113 | 28,171 | 64,951 | 37,259
South Korea | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,249 | 27,360 | 60,245 | 34,083
South Korea | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 864 | 811 | 4,706 | 3,176
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,132 | 10,648 | 35,175 | 20,141
Europe | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,767 | 4,474 | 24,977 | 9,847
Europe | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,365 | 6,174 | 10,198 | 10,294
Japan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,059 | 16,093 | 14,363 | 10,946
Japan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,679 | 12,867 | 8,802 | 9,052
Japan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,380 | 3,226 | 5,561 | 1,894
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,500 | 7,683 | 18,429 | 26,525
Asia-Pacific | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,347 | 6,262 | 12,214 | 18,167
Asia-Pacific | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,153 | 1,421 | 6,215 | 8,358
Rest of the world |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,970 | 1,827 | 4,021 | 5,636
Rest of the world | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,943 | 1,472 | 3,436 | 4,031
Rest of the world | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27 | 355 | 585 | 1,605
Products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 155,756 | 136,367 | 314,683 | 267,000
Products transferred at a point in time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 133,208 | 113,028 | 267,277 | 220,519
Products transferred at a point in time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,548 | 23,339 | 47,406 | 46,481
Services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,068 | 1,651 | 3,894 | 3,231
Services transferred over time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 576 | 609 | 1,222 | 1,221
Services transferred over time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,492 | 1,042 | 2,672 | 2,010
Foundry & Logic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 109,347 | 73,442 | 215,092 | 145,022
Foundry & Logic | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 109,347 | 73,442 | 215,092 | 145,022
Foundry & Logic | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
DRAM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,052 | 36,044 | 43,748 | 64,930
DRAM | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,052 | 36,044 | 43,748 | 64,930
DRAM | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Flash |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,385 | 4,151 | 9,659 | 11,788
Flash | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,385 | 4,151 | 9,659 | 11,788
Flash | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,040 | 24,381 | 50,078 | 48,491
Systems | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 24,040 | $ 24,381 | $ 50,078 | $ 48,491

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