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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Gross carrying amount $ 6,058,000 $ 6,700,000   $ 0
Right of use lease obligations 6,058,000 $ 6,700,000    
Intangible Assets, Net (Excluding Goodwill) $ 55,000   $ 102,000