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STOCK CAPITAL (Schedule of Stock Option Activity) (Details) - Option [Member] - Employees and Members of Board of Directors [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Number of Options  
Outstanding as of December 31, 2018 | shares 2,401,893
Granted | shares 267,852
Exercised | shares (145,246)
Forfeited and expired | shares (10,625)
Outstanding as of June 30, 2019 | shares 2,513,874
Vested and expected to vest as of June 30, 2019 | shares 2,479,232
Exercisable as of June 30, 2019 | shares 1,864,999
Weighted average exercise price  
Outstanding as of December 31, 2018 | $ / shares $ 11.04
Granted | $ / shares 36.15
Exercised | $ / shares 8.65
Forfeited and expired | $ / shares 14.51
Outstanding as of June 30, 2019 | $ / shares 13.84
Vested and expected to vest as of June 30, 2019 | $ / shares 13.70
Exercisable as of June 30, 2019 | $ / shares $ 9.02
Weighted average remaining contractual term in years  
Outstanding as of December 31, 2018 6 years 2 months 8 days
Ountstanding as of June 30, 2019 6 years 1 month 20 days
Vested and expected to vest as of June 30, 2019 6 years 1 month 9 days
Exercisable as of June 30, 2019 5 years 4 months 2 days
Aggregate intrinsic Value  
Outstanding as of December 31, 2018 | $ $ 58,323
Outstanding as of June 30, 2019 | $ 122,227
Vested and expected to vest as of June 30, 2019 | $ 59,508
Exercisable as of June 30, 2019 | $ $ 99,673