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Accounting Policies and Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounting Policies [Abstract] |  |  |
Debt instrument, fair value disclosure | $ 42,374 |  | $ 32,018
Long-term debt | 42,489 |  | 32,014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use asset, net | 6,163 |  | 0
Operating lease liability | $ 4,112 |  | $ 0
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use asset, net |  | $ 6,598 |
Operating lease liability |  | $ 6,952 |

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