INCOME TAXES - Reconciliation of Beginning and Ending Balances of Gross 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]
Balance at beginning of period	$ 23,801	$ 23,271	$ 18,157
Additions for tax positions related to the current year	653	653	510
Additions for tax positions of prior years	0	962	4,917
Reductions for tax positions of prior years	(6,870)	(1,085)	(313)
Balance at end of period	$ 17,584	$ 23,801	$ 23,271