INCOME TAXES - Reconciliation of the Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (3,155)	$ (9,790)	$ (5,884)	$ (16,236)
State tax expense, net of federal taxes	43	190	91	226
Valuation allowance changes affecting income tax provision	2,484	10,266	5,903	17,242
Permanent items	671	52	(19)	105
Total income tax expense	$ 43	$ 718	$ 91	$ 1,337