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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease ROU liabilities $ 9,143 $ 9,688  
Operating lease ROU assets $ 8,686 $ 9,222  
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease ROU liabilities     $ 10,500
Operating lease ROU assets     $ 7,500