INCOME TAXES - Provision for taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0	$ 0	$ 0
State	265	306	128
Current Income Tax Expense (Benefit), Total	265	306	128
Deferred:
Federal	0	0	0
State	0	0	0
Deferred Income Tax Expense Total	0	0	0
Tax expense	$ 265	$ 306	$ 128