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CONCENTRATION OF RISK (Tables) | 12 Months Ended
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Dec. 31, 2018
Risks And Uncertainties [Abstract] |
Revenues and Accounts Receivable From Our Largest Customers | Revenues and accounts receivable from the Company's largest customers for the years ended December 31, were as follows (in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Customer |  | % of Total Revenue |  |  | Accounts Receivable |  |  | % of Total Revenue |  |  | Accounts Receivable |  |  | % of Total Revenue |  |  | Accounts Receivable |
A |  | 37% |  |  | $ | 14,419 |  |  | 62% |  |  | $ | 19,588 |  |  | 63% |  |  | $ | 12,050 |
B |  | 33% |  |  |  | 11,990 |  |  | 24% |  |  |  | 17,348 |  |  | 28% |  |  |  | 9,128 |
C |  | 10% |  |  |  | 9,071 |  |  | 6% |  |  |  | 10,632 |  |  | 4% |  |  |  | 1,427 |
Revenues by Geographic Area | Revenues by geographic area are as follows (in thousands):
|  | Year Ended December 31, |
Country |  | 2018 |  |  | 2017 |  |  | 2016 |
South Korea |  | $ | 171,915 |  |  | $ | 289,418 |  |  | $ | 181,771 |
China |  |  | 51,931 |  |  |  | 24,892 |  |  |  | 7,180 |
Japan |  |  | 6,823 |  |  |  | 8,542 |  |  |  | 4,310 |
Other non-U.S. locations |  |  | 2,967 |  |  |  | 2,438 |  |  |  | 1,849 |
Total non-U.S. locations |  |  | 233,636 |  |  |  | 325,290 |  |  |  | 195,110 |
United States |  |  | 13,778 |  |  |  | 10,339 |  |  |  | 3,776 |
Total revenue |  | $ | 247,414 |  |  | $ | 335,629 |  |  | $ | 198,886 |
Long-Lived Assets (Net) by Geographic Area | Long-lived assets (net), by geographic area are as follows (in thousands):
|  | 2018 |  |  | 2017 |
United States |  | $ | 64,560 |  |  | $ | 53,991 |
Other |  |  | 5,179 |  |  |  | 2,459 |
Total long-lived assets |  | $ | 69,739 |  |  | $ | 56,450 |

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