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Operating Segments and Enterprise-Wide Information - Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 160,753	$ 132,213
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	134,715	108,103
Systems
Disaggregation of Revenue [Line Items]
Revenues	26,038	24,110
United States
Disaggregation of Revenue [Line Items]
Revenues	31,916	34,263
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	25,611	27,655
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	6,305	6,608
South Korea
Disaggregation of Revenue [Line Items]
Revenues	14,088	26,723
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	13,692	25,018
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	396	1,705
China
Disaggregation of Revenue [Line Items]
Revenues	43,642	21,843
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	37,280	18,151
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	6,362	3,692
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	31,780	22,387
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	30,439	21,257
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,341	1,130
Japan
Disaggregation of Revenue [Line Items]
Revenues	8,370	10,432
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,535	5,300
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	2,835	5,132
Europe
Disaggregation of Revenue [Line Items]
Revenues	21,043	9,493
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	16,210	5,373
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,833	4,120
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues	7,863	3,263
Asia-Pacific | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	4,455	2,790
Asia-Pacific | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,408	473
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	2,051	3,809
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,493	2,559
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	558	1,250
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	158,927	130,633
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	134,069	107,491
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	24,858	23,142
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	1,826	1,580
Services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	646	612
Services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,180	968
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	105,745	71,580
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	105,745	71,580
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	24,696	28,886
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	24,696	28,886
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	4,274	7,637
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	4,274	7,637
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	26,038	24,110
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 26,038	$ 24,110

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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