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CONCENTRATION OF RISK (Tables) | 9 Months Ended
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Sep. 30, 2020
Risks And Uncertainties [Abstract] |
Revenues and Accounts Receivable From Our Largest Customers | Revenues and accounts receivable from the Company's largest customers were as follows (in thousands):
|  | % of Total Revenue for the Three Months Ended September 30, |  |  | % of Total Revenue for the Nine Months Ended September 30, |  |  | Accounts Receivable as of |
Customer |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | September 30, 2020 |
A |  | 41% |  |  | 56% |  |  | 38% |  |  | 45% |  |  | $ | 22,138 |
B |  | 28% |  |  | 21% |  |  | 28% |  |  | 24% |  |  | $ | 15,308 |
C |  | 14% |  |  | 12% |  |  | 17% |  |  | 17% |  |  | $ | 33,266 |
Revenues by Geographic Area | Revenues by geographic area are as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
Country |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
South Korea |  | $ | 66,667 |  |  | $ | 70,042 |  |  | $ | 167,154 |  |  | $ | 190,303 |
China |  |  | 43,569 |  |  |  | 23,205 |  |  |  | 101,911 |  |  |  | 98,955 |
Japan |  |  | 2,279 |  |  |  | 1,137 |  |  |  | 6,263 |  |  |  | 3,802 |
Other non-U.S. locations |  |  | 663 |  |  |  | 539 |  |  |  | 1,475 |  |  |  | 1,718 |
Total non-U.S. locations |  |  | 113,178 |  |  |  | 94,923 |  |  |  | 276,803 |  |  |  | 294,778 |
United States |  |  | 3,901 |  |  |  | 2,592 |  |  |  | 10,521 |  |  |  | 8,670 |
Total revenue |  | $ | 117,079 |  |  | $ | 97,515 |  |  | $ | 287,324 |  |  | $ | 303,448 |
Long-Lived Assets (Net) by Geographic Area | Long-lived assets (net), by geographic area are as follows (in thousands):
|  | September 30, 2020 |  |  | December 31, 2019 |
United States |  | $ | 88,476 |  |  | $ | 80,027 |
Other |  |  | 8,354 |  |  |  | 7,845 |
Total long-lived assets |  | $ | 96,830 |  |  | $ | 87,872 |

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