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Segment, Geographic, Product and Significant Customer Information | 6 Months Ended
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Jun. 30, 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 |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |  |  | June 30, 2018 |  |  | July 1, 2017 |
Total net revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Korea |  | $ | 30,980 |  |  | $ | 31,500 |  |  | $ | 68,798 |  |  | $ | 50,119 |
Japan |  |  | 15,017 |  |  |  | 9,267 |  |  |  | 28,396 |  |  |  | 12,620 |
United States |  |  | 7,392 |  |  |  | 8,297 |  |  |  | 14,130 |  |  |  | 21,870 |
China |  |  | 28,333 |  |  |  | 7,330 |  |  |  | 36,375 |  |  |  | 14,017 |
Taiwan |  |  | 1,974 |  |  |  | 4,878 |  |  |  | 3,034 |  |  |  | 16,711 |
Singapore |  |  | 2,380 |  |  |  | 963 |  |  |  | 14,535 |  |  |  | 2,454 |
Other |  |  | 2,528 |  |  |  | 2,192 |  |  |  | 5,649 |  |  |  | 5,950 |
Total net revenues |  | $ | 88,604 |  |  | $ | 64,427 |  |  | $ | 170,917 |  |  | $ | 123,741 |
|  | June 30, 2018 |  |  | December 30, 2017 |
Long-lived tangible assets: |  |  |  |  |  |  |  |
United States |  | $ | 41,851 |  |  | $ | 43,427 |
International |  |  | 1,199 |  |  |  | 1,383 |
Total long-lived tangible assets |  | $ | 43,050 |  |  | $ | 44,810 |
With respect to customer concentration, Samsung Electronics Co. Ltd., Yangtze Memory Technologies Co. Ltd., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended June 30, 2018, and Samsung Electronics Co. Ltd., SK Hynix, Toshiba Corporation, Yangtze Memory Technologies CO. Ltd., Micron Technology, Inc., and Intel Corporation each accounted for more than 10% of total sales for the six months ended June 30, 2018. Samsung Electronics Co. Ltd., SK Hynix, and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended July 1, 2017, and Samsung Electronics Co. Ltd., SK Hynix, Taiwan Semiconductor Manufacturing Company Limited, and Intel Corporation each accounted for more than 10% of total sales for the six months ended July 1, 2017. With respect to accounts receivable concentration, Toshiba Corporation, Yangtze Memory Technologies Co. Ltd., Intel Corporation, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total accounts receivable as of June 30, 2018. Samsung Electronics Co. Ltd., Micron Technology, Inc., and Toshiba Corporation each accounted for more than 10% of total accounts receivable as of December 30, 2017.

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