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Summary of Significant Accounting Policies - Summary of Impact of the Adoption of Topic 842 (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other non-current assets | $ 120 |  | $ 50
Lease Liabilities: |  |  |
Current operating lease liabilities | 328 |  |
Non-current operating lease liabilities | 4,815 |  |
Accrued and other current liabilities | 9,967 |  | 9,576
Other non-current liabilities | $ 45 |  | $ 72
ASU 2016-02 |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other non-current assets |  | $ 741 |
Lease Liabilities: |  |  |
Current operating lease liabilities |  | 339 |
Non-current operating lease liabilities |  | 465 |
Accrued and other current liabilities |  | 9,535 |
ASU 2016-02 | Effect of the Adoption of Topic 842 |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other non-current assets |  | 691 |
Lease Liabilities: |  |  |
Current operating lease liabilities |  | 339 |
Non-current operating lease liabilities |  | 465 |
Accrued and other current liabilities |  | (41) |
Other non-current liabilities |  | $ (72) |

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