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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
9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Number of Options  
Outstanding as of December 31, 2019 | shares 2,112,009
Granted | shares 59,558
Exercised | shares (1,434,129)
Outstanding as of September 30, 2020 | shares 737,438
Vested and expected to vest as of September 30, 2020 | shares 728,547
Exercisable as of September 30, 2020 | shares 497,011
Weighted average exercise price  
Outstanding as of December 31, 2019 | $ / shares $ 15.44
Granted | $ / shares 101.81
Exercised | $ / shares 10.93
Outstanding as of September 30, 2020 | $ / shares 31.18
Vested and expected to vest as of September 30, 2020 | $ / shares 31.01
Exercisable as of September 30, 2020 | $ / shares $ 23.48
Weighted average remaining contractual term in years  
Outstanding as of December 31, 2019 3 years 6 months 29 days
Outstanding as of September 30, 2020 5 years 9 months 14 days
Vested and expected to vest as of September 30, 2020 6 years 10 months 6 days
Exercisable as of September 30, 2020 6 years 3 months 25 days
Aggregate intrinsic Value  
Outstanding as of December 31, 2019 | $ $ 168,229
Outstanding as of September 30, 2020 | $ 152,776
Vested and expected to vest as of September 30, 2020 | $ 151,055
Exercisable as of September 30, 2020 | $ $ 106,792