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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

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