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INCOME TAXES - Schedule of net deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
INCOME TAXES    
Non-current deferred income tax benefits $ 1,063 $ 1,235
Non-current deferred income tax liabilities (5,026) (2,914)
Net deferred income tax liabilities $ (3,963) $ (1,679)