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Organization, Basis of Presentation and Summary of Accounting Principles - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements [Line Items]    
Right-of-use assets $ 7,300  
Lease liabilities $ 8,393  
ASU No. 2016-02    
New Accounting Pronouncements [Line Items]    
Right-of-use assets   $ 7,600
Lease liabilities   $ 7,600