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N. SEGMENT AND GEOGRAPHIC INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Segment Reporting [Abstract] |
Revenue and asset information by geographic region |
|  | For the year ended December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Revenues: |  | (in thousands) |
United States |  | $ | 18,035 |  | $ | 16,766 |  | $ | 30,723 |
Taiwan |  |  | 161,611 |  |  | 141,107 |  |  | 77,680 |
China |  |  | 81,067 |  |  | 32,030 |  |  | 22,046 |
|  | $ | 260,713 |  | $ | 189,903 |  | $ | 130,449 |
|  | As of December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Long-lived assets: |  | (in thousands) |
United States |  | $ | 66,028 |  | $ | 44,280 |  | $ | 15,875 |
Taiwan |  |  | 48,728 |  |  | 45,420 |  |  | 35,688 |
China |  |  | 34,113 |  |  | 24,753 |  |  | 18,008 |
|  | $ | 148,869 |  | $ | 114,453 |  | $ | 69,571 |

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