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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
Gross unrecognized tax benefits, roll forward      
Balance at the beginning of the period $ 6,540 $ 9 $ 471
Additions for tax positions related to the prior years 1,159 6,540  
Decreases for tax positions related to the prior years (2,664) (9) (462)
Balance at the end of the period 5,035 $ 6,540 $ 9
Accrued interest and penalties related to unrecognized tax benefits $ 900