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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Major Customer Disclosure |  |  |  |
Revenues | $ 56,458 | $ 94,720 | $ 102,884 | $ 192,071
TAIWAN, PROVINCE OF CHINA |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 348 | 1,787 | 16,458 | 6,018
South Korea |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 1,666 | 28,291 | 10,267 | 57,260
USA |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 29,864 | 41,155 | 41,085 | 79,593
Japan |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 12,278 | 7,057 | 16,312 | 13,575
Europe |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 3,605 | 4,243 | 7,471 | 8,681
Canada |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 1,885 | 1,352 | 3,295 | 2,420
SINGAPORE |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 6,058 | 4,889 | 6,150 | 12,636
Asia-Other |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | $ 754 | $ 5,946 | $ 1,846 | $ 11,888

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