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CONCENTRATION OF RISK (Tables) | 9 Months Ended
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Sep. 30, 2018
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 |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | September 30, 2018 |
A |  | 50% |  |  | 43% |  |  | 36% |  |  | 59% |  |  | $ | 11,788 |
B |  | 19% |  |  | 31% |  |  | 35% |  |  | 25% |  |  | $ | 10,869 |
C |  | 10% |  |  | 3% |  |  | 9% |  |  | 2% |  |  | $ | 3,372 |
D |  | 9% |  |  | 14% |  |  | 8% |  |  | 7% |  |  | $ | 11,758 |
Revenues by Geographic Area | Revenues by geographic area are as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
Country |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
South Korea |  | $ | 53,883 |  |  | $ | 45,803 |  |  | $ | 126,789 |  |  | $ | 185,937 |
China |  |  | 17,037 |  |  |  | 10,234 |  |  |  | 34,368 |  |  |  | 18,130 |
Japan |  |  | 3,076 |  |  |  | 2,462 |  |  |  | 4,637 |  |  |  | 5,590 |
Other non-U.S. locations |  |  | 457 |  |  |  | 597 |  |  |  | 2,078 |  |  |  | 2,132 |
Total non-U.S. locations |  | $ | 74,453 |  |  | $ | 59,096 |  |  | $ | 167,872 |  |  | $ | 211,789 |
United States |  |  | 3,097 |  |  |  | 2,587 |  |  |  | 9,399 |  |  |  | 7,973 |
Total revenue |  | $ | 77,550 |  |  | $ | 61,683 |  |  | $ | 177,271 |  |  | $ | 219,762 |
Long-Lived Assets (Net) by Geographic Area | Long-lived assets (net), by geographic area are as follows (in thousands):
|  | September 30, 2018 |  |  | December 31, 2017 |
United States |  | $ | 63,908 |  |  | $ | 53,991 |
Other |  |  | 3,559 |  |  |  | 2,459 |
Total long-lived assets |  | $ | 67,467 |  |  | $ | 56,450 |

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