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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Aggregate Intrinsic Value
Stock based compensation expense	$ 29	$ 27	$ 79	$ 70
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
Released (in shares)			0
Forfeited (in shares)			(5)
Restricted stock units at the end of the period (in shares)	165		165		165
Weighted-Average Grant Date Fair Value
Restricted stock units at the beginning of the period (in dollars per share)			$ 3.54
Awarded (in dollars per share)			8.81
Released (in dollars per share)
Forfeited (in dollars per share)			11.09
Restricted stock units at the end of the period (in dollars per share)	$ 3.47		$ 3.47		$ 3.54
Weighted Average Remaining Contractual Life
Restricted stock units			1 year 7 months 6 days		2 years 3 months 29 days
Aggregate Intrinsic Value
Restricted stock units	$ 1,134		$ 1,134		$ 1,158
Stock price	$ 6.87		$ 6.87		$ 7.02
Vested (in shares)			0
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%