INCOME TAXES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Interest and penalties related to income taxes	$ 0	$ 0	$ 0
Accrued interest and penalties related to income taxes	0	$ 0	$ 0
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	75,920,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 70,200,000
Maximum | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, recovery period	17 years
Maximum | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, recovery period	17 years