INCOME TAXES - Reconciliation of the Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (2,156)	$ (2,729)
State tax expense, net of federal taxes	16	48
Change in valuation allowance	2,949	3,419
Other	(793)	(690)
Total income tax expense	$ 16	$ 48