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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
Jul. 01, 2023
Jun. 25, 2022
Jul. 01, 2023
Jun. 25, 2022
Disaggregation of Revenue [Line Items]        
Revenues $ 155,916 $ 203,907 $ 323,364 $ 401,081
Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 115,303 167,708 242,631 327,691
Systems        
Disaggregation of Revenue [Line Items]        
Revenues 40,613 36,199 80,733 73,390
Taiwan        
Disaggregation of Revenue [Line Items]        
Revenues 29,512 50,020 69,841 103,089
Taiwan | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 25,316 45,188 64,213 87,710
Taiwan | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 4,196 4,832 5,628 15,379
United States        
Disaggregation of Revenue [Line Items]        
Revenues 42,673 31,242 80,404 56,889
United States | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 31,131 21,539 55,772 41,515
United States | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 11,542 9,703 24,632 15,374
China        
Disaggregation of Revenue [Line Items]        
Revenues 23,508 49,735 50,607 88,134
China | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 16,516 40,578 34,992 73,369
China | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 6,992 9,157 15,615 14,765
South Korea        
Disaggregation of Revenue [Line Items]        
Revenues 27,863 28,755 48,638 56,256
South Korea | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 26,455 27,418 46,027 52,299
South Korea | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 1,408 1,337 2,611 3,957
Malaysia        
Disaggregation of Revenue [Line Items]        
Revenues 6,677 16,244 17,947 38,443
Malaysia | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 6,177 16,157 16,501 37,674
Malaysia | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 500 87 1,446 769
Japan        
Disaggregation of Revenue [Line Items]        
Revenues 7,932 9,937 18,909 19,319
Japan | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 3,902 6,716 11,038 11,501
Japan | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 4,030 3,221 7,871 7,818
Europe        
Disaggregation of Revenue [Line Items]        
Revenues 10,816 8,091 20,242 16,486
Europe | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 2,415 3,824 5,841 6,206
Europe | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 8,401 4,267 14,401 10,280
Singapore        
Disaggregation of Revenue [Line Items]        
Revenues 2,823 7,108 8,163 18,004
Singapore | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 1,718 5,131 4,918 15,415
Singapore | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 1,105 1,977 3,245 2,589
Rest of the world        
Disaggregation of Revenue [Line Items]        
Revenues 4,112 2,775 8,613 4,461
Rest of the world | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 1,673 1,157 3,329 2,002
Rest of the world | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 2,439 1,618 5,284 2,459
Products transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenues 153,025 199,782 316,413 394,034
Products transferred at a point in time | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 112,985 166,701 236,903 325,537
Products transferred at a point in time | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 40,040 33,081 79,510 68,497
Products and services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenues 2,891 4,125 6,951 7,047
Products and services transferred over time | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 2,318 1,007 5,728 2,154
Products and services transferred over time | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 573 3,118 1,223 4,893
Foundry & Logic        
Disaggregation of Revenue [Line Items]        
Revenues 81,967 122,380 183,529 236,501
Foundry & Logic | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 81,967 122,380 183,529 236,501
Foundry & Logic | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
DRAM        
Disaggregation of Revenue [Line Items]        
Revenues 30,464 36,843 50,354 71,280
DRAM | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 30,464 36,843 50,354 71,280
DRAM | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Flash        
Disaggregation of Revenue [Line Items]        
Revenues 2,872 8,485 8,748 19,910
Flash | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 2,872 8,485 8,748 19,910
Flash | Systems        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Systems        
Disaggregation of Revenue [Line Items]        
Revenues 40,613 36,199 80,733 73,390
Systems | Probe Cards        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Systems | Systems        
Disaggregation of Revenue [Line Items]        
Revenues $ 40,613 $ 36,199 $ 80,733 $ 73,390