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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (loss) from foreign currency transactions | $ 200 | $ 500 | $ 100
Restricted cash |  | $ 0 |
Letter of Credit |  |  |
Restricted cash | $ 800 |  |

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