INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of unrecognized tax benefits, excluding interest
Balance, beginning of the period	$ 2,613	$ 1,996
Additions based on tax positions of the current period	435	570
Additions (subtractions) based on tax positions of the prior period	(134)
Additions (subtractions) based on tax positions of the prior period		47
Balance, end of the period	2,914	2,613
Unrecognized tax benefits including interest	$ 2,900	$ 2,600