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INCOME TAXES - Summary of Income Tax Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Current expense $ 69 $ 125 $ 90 $ 348
Deferred expense 41 249 252 518
Income tax expense $ 110 $ 374 $ 342 $ 866