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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 97,559 | $ 89,855 | $ 76,501 | $ 72,682 | $ 76,773 | $ 73,779 | $ 72,812 | $ 72,914 | $ 336,597 | $ 296,278 | $ 296,558
Property, plant and equipment, net | 58,442 |  |  |  | 56,616 |  |  |  | 58,442 | 56,616 |
South Korea |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 129,542 | 115,486 | 107,441
USA |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 121,209 | 118,278 | 109,060
Property, plant and equipment, net | 55,000 |  |  |  | 55,200 |  |  |  | 55,000 | 55,200 |
Japan |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,215 | 29,687 | 30,454
Europe |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 16,031 | 9,616 | 21,349
Canada |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,478 | 214 | 7,119
SINGAPORE |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 17,908 | 16,312 | 12,980
Asia-Other |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 18,214 | 6,685 | $ 8,155
India |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 1,300 |  |  |  | 1,300 |  |  |  | 1,300 | 1,300 |
Other foreign locations |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 2,100 |  |  |  | $ 100 |  |  |  | $ 2,100 | $ 100 |

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