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Segment, Geographic, Product and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 30, 2017
Segment Reporting [Abstract] |
Total net revenue | The following tables summarize total net revenues and long-lived assets (excluding intangible assets) attributed to significant countries (in thousands):
|  | Years Ended |
|  | December 30, 2017 |  |  | December 31, 2016 |  |  | December 26, 2015 |
Total net revenues (1): |  |  |  |  |  |  |  |  |  |  |  |
South Korea |  | $ | 94,082 |  |  | $ | 44,735 |  |  | $ | 30,572 |
China |  |  | 29,826 |  |  |  | 43,460 |  |  |  | 17,373 |
Singapore |  |  | 21,810 |  |  |  | 37,096 |  |  |  | 17,395 |
United States |  |  | 33,983 |  |  |  | 29,887 |  |  |  | 36,720 |
Taiwan |  |  | 20,147 |  |  |  | 27,189 |  |  |  | 46,715 |
Japan |  |  | 41,979 |  |  |  | 26,604 |  |  |  | 31,140 |
Other |  |  | 16,794 |  |  |  | 12,158 |  |  |  | 7,452 |
Total net revenues |  | $ | 258,621 |  |  | $ | 221,129 |  |  | $ | 187,367 |
(1) | Net revenues are attributed to countries based on the customer's deployment and service locations of systems.
Long-lived tangible assets |
|  | December 30, 2017 |  |  | December 31, 2016 |
Long-lived tangible assets: |  |  |  |  |  |  |  |
United States |  | $ | 43,427 |  |  | $ | 42,688 |
Taiwan |  |  | 510 |  |  |  | 818 |
South Korea |  |  | 576 |  |  |  | 554 |
Japan |  |  | 60 |  |  |  | 57 |
All Other |  |  | 237 |  |  |  | 109 |
Total long-lived tangible assets |  | $ | 44,810 |  |  | $ | 44,226 |
Revenues by product type | The Company’s product lines differ primarily based on the environment in which the systems will be used. Automated systems are used primarily in high-volume production environments. Materials characterization products are primarily used to measure the composition, band gap, structure, and other physical and electrical properties of semiconducting materials for discrete electronic industry, high brightness LED and solar/photovoltaic structures in both development and high-volume environments. Integrated systems are installed inside wafer processing equipment to provide near real-time measurements for improving process control and increasing throughput. Revenues by product type were as follows (in thousands):
|  | Years Ended |
|  | December 30, 2017 |  |  | December 31, 2016 |  |  | December 26, 2015 |
Automated Systems |  | $ | 151,401 |  |  | $ | 127,378 |  |  | $ | 102,386 |
Integrated Systems |  |  | 42,183 |  |  |  | 43,846 |  |  |  | 31,579 |
Materials Characterization Systems |  |  | 21,293 |  |  |  | 13,842 |  |  |  | 12,980 |
Total product revenues |  | $ | 214,877 |  |  | $ | 185,066 |  |  | $ | 146,945 |
Customers accounted for 10% or more of total accounts receivable | The following customers accounted for 10% or more of total accounts receivable, net:
|  | Years Ended |
|  | December 30, 2017 |  |  | December 31, 2016 |  |  | December 26, 2015 |
Taiwan Semiconductor Manufacturing Company Limited |  | *** |  |  |  | 20 | % |  |  | 26 | %
Samsung Electronics Co. Ltd. |  |  | 13 | % |  |  | 14 | % |  | *** |
Micron Technology, Inc. |  |  | 18 | % |  |  | 12 | % |  | *** |
Intel Corporation |  | *** |  |  |  | 11 | % |  | *** |
Toshiba Corporation |  |  | 31 | % |  |  | 10 | % |  |  | 27 | %
*** | The customer accounted for less than 10% of total accounts receivable, net, as of that period end.
Customers accounted for 10% or more of total revenue | The following customers accounted for 10% or more of total net revenue:
|  | Years Ended |
|  | December 30, 2017 |  |  | December 31, 2016 |  |  | December 26, 2015 |
Samsung Electronics Co. Ltd. |  |  | 26 | % |  | *** |  |  |  | 13 | %
SK Hynix |  |  | 13 | % |  |  | 15 | % |  |  | 11 | %
Micron Technology, Inc. |  |  | 12 | % |  |  | 20 | % |  |  | 16 | %
Intel Corporation |  |  | 11 | % |  |  | 18 | % |  | *** |
Toshiba Corporation |  |  | 11 | % |  | *** |  |  |  | 10 | %
Taiwan Semiconductor Manufacturing Company Limited |  | *** |  |  |  | 10 | % |  |  | 19 | %
*** | The customer accounted for less than 10% of total net revenue during the period.

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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