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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 68,563 | $ 59,754 | $ 56,458 | $ 46,426 | $ 101,891 | $ 99,134 | $ 94,720 | $ 97,351 | $ 231,201 | $ 393,096 | $ 336,597
Property, plant and equipment, net | 57,028 |  |  |  | 54,303 |  |  |  | 57,028 | 54,303 |
South Korea |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 13,421 | 115,811 | 129,542
USA |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 129,567 | 165,263 | 121,209
Property, plant and equipment, net | 50,400 |  |  |  | 47,200 |  |  |  | 50,400 | 47,200 |
TAIWAN, PROVINCE OF CHINA |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 21,749 | 9,953 | 6,439
Japan |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 23,222 | 23,378 | 30,215
Europe |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,668 | 22,597 | 16,031
Canada |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,960 | 4,373 | 3,478
SINGAPORE |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 19,140 | 22,554 | 17,908
Asia-Other |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,474 | 29,167 | $ 11,775
India |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 3,800 |  |  |  | 3,400 |  |  |  | 3,800 | 3,400 |
Other foreign locations |  |  |  |  |  |  |  |  |  |  |
Major Customer Disclosure |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 2,800 |  |  |  | $ 3,700 |  |  |  | $ 2,800 | $ 3,700 |

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