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STOCKHOLDERS' EQUITY (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, 2020
USD ($)
$ / shares
shares
Number of Options  
Outstanding as of December 31, 2019 | shares 2,112,009
Granted | shares 59,558
Exercised | shares (568,165)
Outstanding as of June 30, 2020 | shares 1,603,402
Vested and expected to vest as of June 30, 2020 | shares 1,597,973
Exercisable as of June 30, 2020 | shares 1,314,860
Weighted average exercise price  
Outstanding as of December 31, 2019 | $ / shares $ 15.44
Granted | $ / shares 101.81
Exercised | $ / shares 9.84
Outstanding as of June 30, 2020 | $ / shares 20.63
Vested and expected to vest as of June 30, 2020 | $ / shares 20.43
Exercisable as of June 30, 2020 | $ / shares $ 15.45
Weighted average remaining contractual term in years  
Outstanding as of December 31, 2019 3 years 6 months 29 days
Outstanding as of June 30, 2020 3 years 4 months 9 days
Vested and expected to vest as of June 30, 2020 5 years 10 months 17 days
Exercisable as of June 30, 2020 2 years 3 months 25 days
Aggregate intrinsic Value  
Outstanding as of December 31, 2019 | $ $ 168,229
Outstanding as of June 30, 2020 | $ 189,447
Vested and expected to vest as of June 30, 2020 | $ 189,113
Exercisable as of June 30, 2020 | $ $ 162,166