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INCOME TAXES - Unrecognized Tax Benefit Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 1,047 $ 0  
Increase related to prior year tax positions 0 867 $ 0
Increase in current year tax positions 180 180 0
Ending balance $ 1,227 $ 1,047 $ 0