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SHARE-BASED PAYMENTS - Expenses Recognized in Profit or Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SHARE-BASED PAYMENTS      
Expenses recognized in profit or loss $ 4,202 $ 3,027 $ 2,678
Unrecognized compensation expenses $ 4,500