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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 101,891 | $ 99,134 | $ 94,720 | $ 97,351 | $ 97,559 | $ 89,855 | $ 76,501 | $ 72,682 | $ 393,096 | $ 336,597 | $ 296,278
Property, plant and equipment, net | 54,303 |  |  |  | 58,442 |  |  |  | 54,303 | 58,442 |
South Korea |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 115,811 | 129,542 | 115,486
USA |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 165,263 | 121,209 | 118,278
Property, plant and equipment, net | 47,200 |  |  |  | 55,000 |  |  |  | 47,200 | 55,000 |
Japan |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 23,378 | 30,215 | 29,687
Europe |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,597 | 16,031 | 9,616
Canada |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,373 | 3,478 | 214
SINGAPORE |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,554 | 17,908 | 16,312
Asia-Other |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 39,120 | 18,214 | $ 6,685
India |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 3,400 |  |  |  | 1,300 |  |  |  | 3,400 | 1,300 |
Other foreign locations |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 3,700 |  |  |  | $ 2,100 |  |  |  | $ 3,700 | $ 2,100 |

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