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Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Adoption of new accounting pronouncements |  |  |
Accumulated other comprehensive income (loss) | $ (13,287) |  | $ (8,568)
Future lease payments | 22,624 |  |
Total cash, cash equivalents and restricted cash | $ 800 |  |
Accounting Standards Update 2016-01 | Adjustment |  |  |
Adoption of new accounting pronouncements |  |  |
Accumulated other comprehensive income (loss) |  | $ 500 |

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