STOCK BASED COMPENSATION - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Aggregate Intrinsic Value
Stock based compensation expense	$ 22	$ 29	$ 61	$ 79
Restricted Stock Units
Restricted Stock Units
Vesting period			5 years
Restricted Stock Units
Restricted stock units at the beginning of the period (in shares)			165
Awarded (in shares)			5
Issued (in shares)			(40)
Forfeited (in shares)			(10)
Restricted stock units at the end of the period (in shares)	120		120		165
Weighted-Average Grant Date Fair Value
Restricted stock units at the beginning of the period (in dollars per share)			$ 3.47
Awarded (in dollars per share)			6.24
Issued (in dollars per share)			1.00
Forfeited (in dollars per share)			8.77
Restricted stock units at the end of the period (in dollars per share)	$ 3.97		$ 3.97		$ 3.47
Weighted Average Remaining Contractual Life
Restricted stock units			11 months 12 days		1 year 4 months 6 days
Aggregate Intrinsic Value
Restricted stock units	$ 482		$ 482		$ 861
Stock price	$ 4.02		$ 4.02		$ 5.22
Vested (in shares)			40
Restricted Stock Units | First installment
Restricted Stock Units
Vesting (as a percent)			50.00%
Restricted Stock Units | Second installment
Restricted Stock Units
Vesting (as a percent)			50.00%