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INCOME TAXES - Schedule of net deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
INCOME TAXES    
Non-current deferred income tax benefits $ 1,235 $ 2,487
Non-current deferred income tax liabilities (2,914) (3,085)
Net deferred income tax liabilities $ (1,679) $ (598)