SHAREHOLDERS' EQUITY (Summary of Employee Share Option and RSU Activity ) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Aggregate intrinsic value (in thousands)
Issuance of ordinary share upon exercise of stock options and vesting of RSUs (in shares)	87,795
Stock Options and RSUs
Number
Options and RSU's outstanding at the beginning of the period (in shares)	2,251,014
Options and RSU's outstanding at the end of the period (in shares)	2,592,398	2,251,014
Average exercise price
Options and RSUs outstanding at the beginning of the period (in USD per share)	$ 6.47
Options and RSUs outstanding at the end of the period (in USD per share)	$ 5.39	$ 6.47
Average remaining contractual life (in years)
Options and RSUs outstanding	7 years 5 months 12 days	7 years 9 months 18 days
Aggregate intrinsic value (in thousands)
Options and RSUs outstanding at beginning of the period	$ 1,740
Options and RSUs outstanding at the end of the period	$ 578	$ 1,740
Options
Number
Options granted (in shares)	413,746
Options exercised (in shares)	(30,192)
Options forfeited (in shares)	(169,008)
Options exercisable at the end of the period (in shares)	1,272,727
Average exercise price
Options granted (in USD per share)	$ 2.01
Options exercised (in USD per share)	1.39
Options forfeited (in USD per share)	2.99
Options exercisable at the end of the period (in USD per share)	$ 6.12
Average remaining contractual life (in years)
Options exercisable at the end of the period	6 years 5 months 16 days
Aggregate intrinsic value (in thousands)
Options exercisable at the end of the period	$ 64
RSU
Number
RSUs granted (in shares)	230,484
RSUs vested (in shares)	(59,450)
RSUs forfeited (in shares)	(44,196)