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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Jun. 30, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liability   $ 9,265 $ 9,688
Right-of-use asset   $ 8,746 $ 9,222
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member    
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liability $ 10,500    
Right-of-use asset $ 7,500