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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Impairment of Long Lived Assets |  |
Impairment loss recognized | $ 0 | $ 0
Income Taxes |  |
Uncertain income tax benefits, interest or penalties | $ 0 |

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