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Foreign Exchange Transaction Gains/Losses (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Other (expense) income, net |  |  |  |
Foreign exchange gain (loss) | $ (339,000) | $ 83,000 | $ (414,000) | $ 327,000

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