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CONCENTRATION OF RISK (Tables) | 9 Months Ended
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Sep. 30, 2019
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 Revenues for the Three Months Ended September 30, |  |  | % of Revenues for the Nine Months Ended September 30, |  |  | Accounts Receivable as of |
Customer |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  | September 30, 2019 |
A |  | 56% |  |  | 50% |  |  | 45% |  |  | 36% |  |  | $ | 21,615 |
B |  | 21% |  |  | 19% |  |  | 24% |  |  | 35% |  |  | $ | 9,820 |
C |  | 12% |  |  | 9% |  |  | 17% |  |  | 8% |  |  | $ | 19,609 |
D |  | 1% |  |  | 10% |  |  | 5% |  |  | 9% |  |  | $ | 444 |
Revenues by Geographic Area | Revenues by geographic area are as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
Country |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
South Korea |  | $ | 70,042 |  |  | $ | 53,883 |  |  | $ | 190,303 |  |  | $ | 126,789 |
China |  |  | 23,205 |  |  |  | 17,037 |  |  |  | 98,955 |  |  |  | 34,368 |
Japan |  |  | 1,137 |  |  |  | 3,076 |  |  |  | 3,802 |  |  |  | 4,637 |
Other non-U.S. locations |  |  | 539 |  |  |  | 457 |  |  |  | 1,718 |  |  |  | 2,078 |
Total non-U.S. locations |  |  | 94,923 |  |  |  | 74,453 |  |  |  | 294,778 |  |  |  | 167,872 |
United States |  |  | 2,592 |  |  |  | 3,097 |  |  |  | 8,670 |  |  |  | 9,399 |
Total revenue |  | $ | 97,515 |  |  | $ | 77,550 |  |  | $ | 303,448 |  |  | $ | 177,271 |
Long-Lived Assets (Net) by Geographic Area | Long-lived assets (net), by geographic area are as follows (in thousands):
|  | September 30, 2019 |  |  | December 31, 2018 |
United States |  | $ | 79,437 |  |  | $ | 64,560 |
Other |  |  | 6,829 |  |  |  | 5,179 |
Total long-lived assets |  | $ | 86,266 |  |  | $ | 69,739 |

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