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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Current state income tax expense |  |  | $ 38 |  | $ 0
Deferred federal income tax expense |  |  | 0 |  | 0
Total income tax expense | $ 38 | $ 0 | $ 38 | $ 0 | $ 0

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