SHAREHOLDERS' EQUITY - OPTIONS ROLL FORWARD (Details) - Amended 2009 Stock Plan - Stock options, employees and directors - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Number of options
Options outstanding at beginning of period (in shares)	1,689,555
Options granted (in shares)	113,107
Options exercised (in shares)	(32,910)
Options forfeited (in shares)	(5,178)
Options outstanding at end of period (in shares)	1,764,574	1,689,555
Options vested at end of period (in shares)	1,220,705
Weighted average exercise price
Options outstanding at beginning of period (in dollars per share)	$ 4.02
Options granted (in dollars per share)	4.60
Options exercised (in dollars per share)	3.61
Options forfeited (in dollars per share)	3.96
Options outstanding at end of period (in dollars per share)	4.06	$ 4.02
Options vested at end of period (in dollars per share)	$ 4.17
Weighted average remaining contractual life
Weighted average remaining contractual life, Outstanding (in years)	5 years 7 months 24 days	6 years 22 days
Weighted average remaining contractual life, Vested (in years)	4 years 4 months 21 days
Aggregate intrinsic value
Aggregate intrinsic value, Outstanding	$ 214
Aggregate intrinsic value, Outstanding, exercisable	$ 80
Maximum
Aggregate intrinsic value
Aggregate intrinsic value, Outstanding		$ 1