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Summary of Significant Accounting Policies - Recent Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Lease liability $ 4,193  
Adjustment | ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
ROU assets   $ 2,132
Lease liability   $ 2,317