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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]    
Right-of-use asset $ 4,367  
Topic 842    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Right-of-use asset   $ 5,400
Operating lease liability   $ 5,400