INCOME TAXES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Net deferred income tax asset	$ 28,320,000	$ 40,776,000
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	70,320,000	72,370,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 69,710,000	$ 73,270,000
Minimum | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, recovery period	12 years
Minimum | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, recovery period	11 years
Maximum | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, recovery period	18 years
Maximum | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, recovery period	18 years