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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 76,773 | $ 73,779 | $ 72,812 | $ 72,914 | $ 72,040 | $ 69,712 | $ 76,518 | $ 78,288 | $ 296,278 | $ 296,558 | $ 271,501
Property, plant and equipment, net | 56,616 |  |  |  | 64,023 |  |  |  | 56,616 | 64,023 |
South Korea |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 115,486 | 107,441 | 112,806
USA |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 118,278 | 109,060 | 80,652
Property, plant and equipment, net | 55,200 |  |  |  | 63,000 |  |  |  | 55,200 | 63,000 |
Japan |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 29,687 | 30,454 | 51,156
Europe |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,616 | 21,349 | 15,985
Canada |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 214 | 7,119 | 7,896
SINGAPORE |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 16,312 | 12,980 | 0
Asia-Other |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,685 | 8,155 | $ 3,006
India |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 1,300 |  |  |  | 900 |  |  |  | 1,300 | 900 |
Other foreign locations |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 100 |  |  |  | $ 100 |  |  |  | $ 100 | $ 100 |

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