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INCOME TAXES - Unrecognized Tax Benefit Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 977 $ 1,227 $ 1,047
Increase related to prior year tax positions 0 0 0
Decrease related to prior year tax positions (6) (101) 0
Increase in current year tax positions 120 120 180
Decrease related to lapsing of statute of limitations (167) (269) 0
Ending balance $ 924 $ 977 $ 1,227