INCOME TAXES - Reconciliation of the Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (2,942)	$ (3,155)	$ (5,098)	$ (5,884)
State tax expense, net of federal taxes	154	43	170	91
Change in valuation allowance	1,941	2,484	4,890	5,903
Other	1,001	671	208	(19)
Total income tax expense	$ 154	$ 43	$ 170	$ 91