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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
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