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Segment, Geographic, Product and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 27, 2014
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 27, 2014 |  | December 28, 2013 |  | December 29, 2012
Total net revenues (1): |  |  |  |  |
United States | $ | 36,123 |  |  | 47,019 |  |  | 44,811 |
South Korea | 41,381 |  |  | 34,873 |  |  | 79,555 |
China | 28,702 |  |  | 13,063 |  |  | 5,323 |
Taiwan | 19,790 |  |  | 9,645 |  |  | 16,757 |
Other | 40,447 |  |  | 39,707 |  |  | 36,435 |
Total net revenues | $ | 166,443 |  |  | $ | 144,307 |  |  | $ | 182,881 |
(1) Net revenues are attributed to countries based on the customer's deployment and service locations of systems.
Long-lived tangible assets |
Long-lived tangible assets: | December 27, 2014 |  | December 28, 2013
United States | $ | 47,729 |  |  | $ | 44,775 |
Japan | 71 |  |  | 125 |
South Korea | 284 |  |  | 445 |
All Other | 1,549 |  |  | 2,094 |
Total long-lived tangible assets | $ | 49,633 |  |  | $ | 47,439 |
Revenues by product type | Revenues by product type were as follows (in thousands):
| Years Ended
| December 27, 2014 |  | December 28, 2013 |  | December 29, 2012
Automated Systems | $ | 108,768 |  |  | $ | 82,924 |  |  | $ | 119,451 |
Integrated Systems | 15,334 |  |  | 11,412 |  |  | 12,379 |
Materials Characterization Systems | 9,487 |  |  | 13,066 |  |  | 11,997 |
Total product revenues | $ | 133,589 |  |  | $ | 107,402 |  |  | $ | 143,827 |
Customers accounted for 10% or more of total accounts receivable | The following customers accounted for 10% or more of total accounts receivable, net:
| At
| December 27, 2014 |  | December 28, 2013 |  | December 29, 2012
Samsung Electronics Co. Ltd. | 10.0 | % |  | 27.4 | % |  | *** |
Intel Corporation | *** |  |  | 14.4 | % |  | 12.3 | %
Taiwan Semiconductor Manufacturing Company Limited | 20.2 | % |  | 12.1 | % |  | 17.3 | %
SK Hynix | *** |  |  | 21.8 | % |  | *** |
Micron | 23.7 | % |  | *** |  |  | *** |
GLOBALFOUNDRIES | 10.2 | % |  | *** |  |  | *** |
*** 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 27, 2014 |  | December 28, 2013 |  | December 29, 2012
Samsung Electronics Co. Ltd. | 26.9 | % |  | 14.4 | % |  | 27.8 | %
Intel Corporation | 12.6 | % |  | 30.0 | % |  | 22.3 | %
SK Hynix | 12.2 | % |  | 18.4 | % |  | 16.5 | %
Micron | 10.4 | % |  | *** |  |  | *** |
*** The customer accounted for less than 10% of total net revenue during the period.

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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=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: 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=6534315&loc=d3e9038-108599 + Details
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