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STOCK CAPITAL (Summary of the activity in the share options) (Details) - Employee Stock Option [Member] - Employees and Members of Board of Directors [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Number of options    
Outstanding at the beginning of the period   3,524,310
Granted   180,983
Exercised   (1,280,057)
Forfeited or expired   (23,343)
Outstanding at the end of the period 3,524,310 2,401.893
Weighted average exercise price    
Outstanding at the beginning of the period   $ 7.40
Granted   38.05
Exercised   4.89
Forfeited or expired   8.35
Outstanding at the end of the period $ 7.40 $ 11.04
Weighted average remaining contractual term in years    
Outstanding 6 years 4 months 6 days 6 years 2 months 8 days
Aggregate intrinsic Value    
Outstanding at the beginning of the period   $ 106,251
Outstanding at the end of the period $ 106,251 $ 58,323
Vested and expected to vest at the end of the period    
Number of options   2,359,484
Weighted average exercise price   $ 10.94
Weighted average remaining contractual term in years   6 years 2 months 1 day
Aggregate intrinsic Value   $ 57,520
Exercisable at the end of the period    
Number of options   1,843,014
Weighted average exercise price   $ 7.93
Weighted average remaining contractual term in years   5 years 7 months 21 days
Aggregate intrinsic Value   $ 50,173