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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncement - Summary of Impact of Adoption of New Accounting Standard (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating Lease, Right-of-Use Asset $ 2,860    
Prepaid 5,524   $ 6,776
Operating lease liabilities, current (1,595)    
Operating lease liabilities, non-current (1,364)    
ASU 2016-02      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating Lease, Right-of-Use Asset 2,410 $ 2,410  
Prepaid 6,693 (83)  
Operating lease liabilities, current (898) (898)  
Operating lease liabilities, non-current $ (1,429) $ (1,429)