INCOME TAXES - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Computed at statutory rate	$ (3,355)	$ (13,944)
State taxes, net of federal benefit	(632)	(1,901)
Permanent items and other	(379)	992
Credit carryforwards	(122)	2,014
Foreign income taxed at different rates	0	22
Goodwill impairment	0	3,907
Change in tax carryforwards not benefitted	3,137	(352)
Change in valuation allowance	1,688	(14,849)
Income tax expense (benefit)	$ 337	$ (24,111)