SHAREHOLDERS' EQUITY - OPTIONS ROLL FORWARD (Details) - Amended and Restated 2009 Stock Incentive Plan - Stock options, employees and directors - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Number of options
Options outstanding at beginning of period (in shares)	1,689,555
Options granted (in shares)	68,107
Options exercised (in shares)	(32,910)
Options forfeited (in shares)	(5,178)
Options outstanding at end of period (in shares)	1,719,574	1,689,555
Options vested at end of period (in shares)	1,135,038
Weighted average exercise price
Options outstanding at beginning of period (in dollars per share)	$ 4.02
Options granted (in dollars per share)	3.35
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)	4.00	$ 4.02
Options vested at end of period (in dollars per share)	$ 4.16
Weighted average remaining contractual life
Weighted average remaining contractual life, Outstanding (in years)	5 years 9 months 15 days	6 years 22 days
Weighted average remaining contractual life, Vested (in years)	4 years 5 months 19 days
Aggregate intrinsic value
Aggregate intrinsic value, Outstanding	$ 3,963
Aggregate intrinsic value, Outstanding, exercisable	$ 2,432
Maximum
Aggregate intrinsic value
Aggregate intrinsic value, Outstanding		$ 1