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Segment, Geographic, Product and Significant Customer Information | 9 Months Ended
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Sep. 28, 2019
Segment Reporting [Abstract] |
Segment, Geographic, Product and Significant Customer Information | Note 15. 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 28, 2019 |  |  | September 29, 2018 |  |  | September 28, 2019 |  |  | September 29, 2018 |
Total net revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 14,091 |  |  | $ | 8,414 |  |  | $ | 40,135 |  |  | $ | 22,545 |
China |  |  | 20,357 |  |  |  | 14,486 |  |  |  | 60,590 |  |  |  | 50,861 |
Japan |  |  | 11,189 |  |  |  | 19,693 |  |  |  | 19,720 |  |  |  | 48,090 |
South Korea |  |  | 10,519 |  |  |  | 23,598 |  |  |  | 37,557 |  |  |  | 92,397 |
Taiwan |  |  | 8,590 |  |  |  | 1,883 |  |  |  | 23,529 |  |  |  | 4,918 |
Singapore |  |  | 2,775 |  |  |  | 5,842 |  |  |  | 13,049 |  |  |  | 20,377 |
Other |  |  | 5,604 |  |  |  | 2,674 |  |  |  | 13,265 |  |  |  | 8,319 |
Total net revenues |  | $ | 73,125 |  |  | $ | 76,590 |  |  | $ | 207,845 |  |  | $ | 247,507 |
|  | September 28, 2019 |  |  | December 29, 2018 |
Long-lived tangible assets: |  |  |  |  |  |  |  |
United States |  | $ | 51,152 |  |  | $ | 46,325 |
International |  |  | 1,297 |  |  |  | 1,575 |
Total long-lived tangible assets |  | $ | 52,449 |  |  | $ | 47,900 |
With respect to customer concentration, SK hynix, Intel Corporation, Toshiba Memory Corporation, Taiwan Semiconductor Manufacturing Company, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the three months ended September 28, 2019, and SK hynix, Intel Corporation, Taiwan Semiconductor Manufacturing Company Limited, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the nine months ended September 28, 2019. Samsung Electronics Co. Ltd., Yangtze Memory Technologies Co. Ltd., SK hynix, and Toshiba Memory 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 Memory 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. With respect to accounts receivable concentration, Yangtze Memory Technologies Co. Ltd., Toshiba Memory Corporation, and Taiwan Semiconductor Manufacturing Company each accounted for more than 10% of total accounts receivable as of September 28, 2019. SK hynix and Toshiba Memory Corporation each accounted for more than 10% of total accounts receivable as of December 29, 2018.

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