INCOME TAXES - Summary of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income tax at statutory rates	(21.00%)	(21.00%)	(34.00%)
State income tax	(4.60%)	(5.50%)	(5.00%)
Other permanent differences	(0.30%)	1.20%	0.40%
Tax rates different than statutory	(0.50%)	1.20%	0.50%
Statutory tax rate change - Deferred - Tax Reform Act	0.00%	0.00%	(128.40%)
Statutory tax rate change - Valuation Allowance - Tax Reform Act	0.00%	0.00%	128.40%
Goodwill impairment	3.40%	0.00%	0.00%
Refundable AMT credit	0.00%	0.00%	(1.50%)
Change in valuation allowance	21.80%	25.20%	40.10%
Effective tax rate	(1.20%)	1.10%	0.50%