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SHARE- BASED COMPENSATION (Schedule of Summarized Number of Share Options) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
shares
yr
Dec. 31, 2016
USD ($)
shares
yr
Dec. 31, 2015
USD ($)
shares
Weighted Average Exercise Price      
The weighted average remaining contractual life for the share options | yr 6.69 6.17  
Employees Consultants and Directors [Member]      
Number of Options      
Outstanding at beginning of year | shares 4,439,884 4,970,028 3,770,762
Granted | shares 1,537,250 377,500 1,455,250
Exercised | shares (269,738) (76,447) (53,408)
Forfeited | shares (601,096) (831,197) (202,576)
Outstanding at end of year | shares 5,106,300 4,439,884 4,970,028
Exercisable at end of year | shares 3,146,823 3,203,850 2,794,672
Weighted Average Exercise Price      
Outstanding at beginning of year | $ $ 9.5 $ 9.65 $ 9.75
Granted | $ 5.08 6.94 8.9
Exercised | $ 2.18 2.45 5.58
Forfeited | $ 10.22 9.87 7.15
Outstanding at end of year | $ 8.47 9.5 9.65
Exercisable at end of year | $ $ 10.73 $ 9.18 $ 8.79