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SHAREHOLDERS' EQUITY (Schedule of Stock Option Activity) (Details) - Employee and director [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Number of options  
Outstanding at January 1, 2019 | shares 2,883,410
Granted | shares 912,500
Exercised | shares (557,810)
Forfeited | shares (91,250)
Outstanding at June 30, 2019 | shares 3,146,850
Exerciable at June 30, 2019 | shares 965,059
Weighted-average exercise price  
Outstanding at January 1, 2019 | $ / shares $ 5.6
Granted | $ / shares 9.5
Exercised | $ / shares 5.1
Forfeited | $ / shares 7.1
Outstanding at June 30, 2019 | $ / shares 6.7
Exercisable at June 30, 2019 | $ / shares $ 4.6
Weighted-average remaining contractual term  
Outstanding at June 30, 2019 4 years 2 months 12 days
Exercisable at June 30, 2019 2 years 8 months 12 days
Aggregate intrinsic value  
Outstanding at June 30, 2019 | $ $ 6,384
Exercisable at June 30, 2019 | $ $ 3,712