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STOCK CAPITAL (Schedule of exercise price ranges) (Details) - Employees and Members of Board of Directors [Member]
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding 2,401,893
Weighted average remaining contractual Life in years 6 years 2 months 8 days
Options exercisable 1,843,014
Weighted average remaining contractual Life in years 5 years 7 months 21 days
Exercise Price Range One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise price, lower | $ / shares $ 0.87
Range of exercise price, upper | $ / shares $ 1.50
Options outstanding 22,236
Weighted average remaining contractual Life in years 6 months 25 days
Options exercisable 22,236
Weighted average remaining contractual Life in years 6 months 25 days
Exercise Price Range Two [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise price, lower | $ / shares $ 2.01
Range of exercise price, upper | $ / shares $ 2.46
Options outstanding 331,482
Weighted average remaining contractual Life in years 2 years 6 months 21 days
Options exercisable 331,482
Weighted average remaining contractual Life in years 2 years 6 months 21 days
Exercise Price Range Three [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise price, lower | $ / shares $ 3.03
Range of exercise price, upper | $ / shares $ 5.01
Options outstanding 1,080,892
Weighted average remaining contractual Life in years 5 years 10 months 10 days
Options exercisable 1,043,120
Weighted average remaining contractual Life in years 5 years 10 months 10 days
Exercise Price Range Four [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price | $ / shares $ 9.36
Options outstanding 10,546
Weighted average remaining contractual Life in years 6 years 29 days
Options exercisable 10,098
Weighted average remaining contractual Life in years 6 years 29 days
Exercise Price Range Five [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise price, lower | $ / shares $ 13.70
Range of exercise price, upper | $ / shares $ 14.85
Options outstanding 426,181
Weighted average remaining contractual Life in years 8 years 1 month 20 days
Options exercisable 180,479
Weighted average remaining contractual Life in years 8 years 1 month 20 days
Exercise Price Range Six [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise price, lower | $ / shares $ 15.34
Range of exercise price, upper | $ / shares $ 17.14
Options outstanding 183,623
Weighted average remaining contractual Life in years 7 years 7 months 28 days
Options exercisable 100,571
Weighted average remaining contractual Life in years 7 years 7 months 28 days
Exercise Price Range Seven [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise price, lower | $ / shares $ 20.81
Range of exercise price, upper | $ / shares $ 25.09
Options outstanding 165,950
Weighted average remaining contractual Life in years 6 years 8 months 5 days
Options exercisable 121,100
Weighted average remaining contractual Life in years 6 years 8 months 5 days
Exercise Price Range Eight [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price | $ / shares $ 38.05
Options outstanding 180,983
Weighted average remaining contractual Life in years 9 years 4 days
Options exercisable 33,928
Weighted average remaining contractual Life in years 9 years 4 days