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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | Mar. 31, 2019 | Jan. 01, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Gross carrying amount | $ 6,694,000 | $ 6,700,000 |  | $ 0 |
Right of use lease obligations | $ 6,482,000 | $ 6,700,000 |  |  |
Intangible Assets, Net (Excluding Goodwill) |  |  | $ 82,000 |  | $ 102,000

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