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The Company and Summary of Significant Accounting Policies - Foreign Currency Translation (Details) | 12 Months Ended
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Dec. 31, 2018 entity | Dec. 31, 2018 company | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
The Company and Summary of Significant Accounting Policies |  |  |  |  |
Equity method investments | 7 | 7 |  |  |
Foreign Currency Translation |  |  |  |  |
Foreign exchange transaction exchange gains (losses) |  |  | $ 165,000 | $ (602,000) | $ 232,000

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