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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Value added taxes and Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use assets $ 74 $ 2,252  
Lease liabilities $ 65 $ 2,595  
Cumulative Effect, Period of Adoption, Adjustment [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use assets     $ 5,141
Lease liabilities     $ 3,735