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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets $ 8,134 $ 8,641
Operating lease liabilities $ 12,526  
Topic 842    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets   8,641
Operating lease liabilities   $ 12,800