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Foreign Exchange Transaction Gains/Losses (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Other (expense) income, net        
Foreign exchange loss $ 24,000 $ 116,000 $ 80,000 $ 340,000