SHAREHOLDERS' EQUITY (Narrative - Share Option Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Shareholders' equity (deficiency) [Line Items]
Unrecognized compensation cost	$ 6,300
Period of recognition of unrecognized compensation cost	2 years 2 months 12 days
Options
Shareholders' equity (deficiency) [Line Items]
Shares reserved for future issuance (in shares)	1,116,612		380,153
Award vesting period	4 years
Weighted average grant date fair values, options (in USD per share)	$ 5.88
Total intrinsic value of options exercised	$ 25	$ 786
Options granted (in shares)	0
Non-employee Director | Options
Shareholders' equity (deficiency) [Line Items]
Award vesting period	1 year