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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Major Customer Disclosure |  |
Revenues | $ 46,426 | $ 97,351
TAIWAN, PROVINCE OF CHINA |  |
Major Customer Disclosure |  |
Revenues | 16,110 | 4,232
South Korea |  |
Major Customer Disclosure |  |
Revenues | 8,601 | 28,969
USA |  |
Major Customer Disclosure |  |
Revenues | 11,221 | 38,438
Japan |  |
Major Customer Disclosure |  |
Revenues | 4,034 | 6,518
Europe |  |
Major Customer Disclosure |  |
Revenues | 3,866 | 4,438
Canada |  |
Major Customer Disclosure |  |
Revenues | 1,410 | 1,068
SINGAPORE |  |
Major Customer Disclosure |  |
Revenues | 92 | 7,747
Asia-Other |  |
Major Customer Disclosure |  |
Revenues | $ 1,092 | $ 5,941

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