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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred Rent |  | $ 25,000 | $ 25,000
Right-of-use assets |  |  |
Operating lease right-of-use assets | $ 810 | 1,029 | 0
Operating lease liabilities |  |  |
Current | 802 | 916 | 0
Noncurrent | 29 | 138 | 25
Deferred rent |  |  | $ 0
Adjustments Due to the Adoption of ASC 842 |  |  |
Right-of-use assets |  |  |
Operating lease right-of-use assets | $ 1,029 |  |
Operating lease liabilities |  |  |
Current |  | 916 |
Noncurrent |  | $ 138 |

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