INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ (9,558)	$ (46,722)
State tax, net of federal benefit	276	(3,845)
Goodwill impairment	3,661	0
Disallowed officers' compensation	818	0
Non-deductible transaction cost	451	0
Non-deductible meals and entertainment	148	129
Stock based compensation	17	2,038
Change in valuation allowance	(13,029)	48,943
Uncertain tax provisions	(190)	(5,758)
Non-deductible other expense	37	5,837
Research credit	0	(138)
Intraperiod tax allocations	0	(5,767)
Total tax benefit	$ (17,369)	$ (5,283)