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INCOME TAXES - Reconciliation of Total Amounts of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits - at beginning of year $ 691 $ 417 $ 124
Increases in balances related to tax positions taken in prior years 23 0 80
Decreases in balances related to tax positions taken in prior years (63) (13) 0
Increases in balances related to tax positions taken in current year 614 287 213
Lapses in statutes of limitations 0 0 0
Unrecognized tax benefits - at end of year $ 1,265 $ 691 $ 417