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Foreign Exchange Transaction Gains/Losses (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other (expense) income, net        
Foreign exchange gain (loss) $ 116,000 $ (339,000) $ (224,000) $ (414,000)