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Summary of Significant Accounting Policies - Recent Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Jan. 01, 2018
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Accounting Policies [Abstract] |  |  |
ROU assets | $ 4,626 | $ 4,500 |
Total lease liabilities | $ 4,410 | 4,300 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to retained earnings |  | 233 | $ 0
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to retained earnings |  | $ 233 | $ (59)

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