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CONCENTRATION OF RISK (Tables) | 12 Months Ended
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Dec. 31, 2020
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):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Customer |  | % of Total Revenue |  |  | Accounts Receivable |  |  | % of Total Revenue |  |  | Accounts Receivable |  |  | % of Total Revenue |  |  | Accounts Receivable |
A |  | 41% |  |  | $ | 20,476 |  |  | 44% |  |  | $ | 13,830 |  |  | 37% |  |  | $ | 14,419 |
B |  | 30% |  |  |  | 26,776 |  |  | 27% |  |  |  | 19,346 |  |  | 33% |  |  |  | 11,990 |
C |  | 13% |  |  |  | 2,757 |  |  | 15% |  |  |  | 10,592 |  |  | 10% |  |  |  | 9,071 |
Revenues by Geographic Area | Revenues by geographic area are as follows (in thousands):
|  | Year Ended December 31, |
Country |  | 2020 |  |  | 2019 |  |  | 2018 |
South Korea |  | $ | 263,079 |  |  | $ | 250,562 |  |  | $ | 171,915 |
China |  |  | 142,076 |  |  |  | 135,259 |  |  |  | 51,931 |
Japan |  |  | 7,405 |  |  |  | 5,276 |  |  |  | 6,823 |
Other non-U.S. locations |  |  | 1,728 |  |  |  | 2,270 |  |  |  | 2,967 |
Total non-U.S. locations |  |  | 414,288 |  |  |  | 393,367 |  |  |  | 233,636 |
United States |  |  | 14,579 |  |  |  | 11,810 |  |  |  | 13,778 |
Total revenue |  | $ | 428,867 |  |  | $ | 405,177 |  |  | $ | 247,414 |
Long-Lived Assets (Net) by Geographic Area | Long-lived assets (net), by geographic area are as follows (in thousands):
|  | 2020 |  |  | 2019 |
United States |  | $ | 93,230 |  |  | $ | 80,027 |
Other |  |  | 8,883 |  |  |  | 7,845 |
Total long-lived assets |  | $ | 102,113 |  |  | $ | 87,872 |

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