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Segment, Geographic, Product and Significant Customer Information | 9 Months Ended
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Sep. 29, 2018
Segment Reporting [Abstract] |
Segment, Geographic, Product and Significant Customer Information | Note 13. Segment, Geographic, Product and Significant Customer Information The Company has one operating segment, which is the sale, design, manufacture, marketing and support of optical critical dimension and thin film systems. The following tables summarize total net revenues and long-lived assets (excluding intangible assets) attributed to significant countries (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 29, 2018 |  |  | September 30, 2017 |  |  | September 29, 2018 |  |  | September 30, 2017 |
Total net revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Korea |  | $ | 23,598 |  |  | $ | 22,269 |  |  | $ | 92,397 |  |  | $ | 72,388 |
Japan |  |  | 19,693 |  |  |  | 4,781 |  |  |  | 48,090 |  |  |  | 17,400 |
United States |  |  | 8,414 |  |  |  | 6,231 |  |  |  | 22,545 |  |  |  | 28,101 |
China |  |  | 14,486 |  |  |  | 3,403 |  |  |  | 50,861 |  |  |  | 17,420 |
Taiwan |  |  | 1,883 |  |  |  | 2,304 |  |  |  | 4,918 |  |  |  | 19,016 |
Singapore |  |  | 5,842 |  |  |  | 9,774 |  |  |  | 20,377 |  |  |  | 12,229 |
Other |  |  | 2,674 |  |  |  | 7,913 |  |  |  | 8,319 |  |  |  | 13,862 |
Total net revenues |  | $ | 76,590 |  |  | $ | 56,675 |  |  | $ | 247,507 |  |  | $ | 180,416 |
|  | September 29, 2018 |  |  | December 30, 2017 |
Long-lived tangible assets: |  |  |  |  |  |  |  |
United States |  | $ | 42,013 |  |  | $ | 43,427 |
International |  |  | 1,122 |  |  |  | 1,383 |
Total long-lived tangible assets |  | $ | 43,135 |  |  | $ | 44,810 |
With respect to customer concentration, Samsung Electronics Co. Ltd., Yangtze Memory Technologies Co. Ltd., SK Hynix, and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended September 29, 2018, and Samsung Electronics Co. Ltd., SK Hynix, Toshiba Corporation, Yangtze Memory Technologies Co. Ltd., and Micron Technology, Inc. each accounted for more than 10% of total sales for the nine months ended September 29, 2018. Samsung Electronics Co. Ltd., Intel Corporation, and Micron Technology, Inc. each accounted for more than 10% of total sales for the three months ended September 30, 2017, and Samsung Electronics Co. Ltd., SK Hynix, Intel Corporation, and Micron Technology, Inc. each accounted for more than 10% of total sales for the nine months ended September 30, 2017. With respect to accounts receivable concentration, Toshiba Corporation and SK Hynix each accounted for more than 10% of total accounts receivable as of September 29, 2018. Samsung Electronics Co. Ltd., Micron Technology, Inc., and Intel Corporation each accounted for more than 10% of total accounts receivable as of December 30, 2017.

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