INCOME TAXES - Unrecognized income tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Beginning Balance	$ 0	$ 0
Additions for tax positions of prior years	1,903	0
Unrecognized Tax Benefits, Ending Balance	$ 1,903	$ 0