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SHAREHOLDERS' EQUITY (Schedule of Stock Option Activity) (Details) - Service Based Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Number of options    
Outstanding at January 1, 2020 4,091,127  
Granted 1,156,331  
Exercised (424,360)  
Cancelled (221,736)  
Outstanding at June 30, 2020 4,601,362 4,091,127
Exercisable at June 30, 2020 1,839,962  
Vested and expected to vest at June 30, 2020 3,777,117  
Weighted average Exercise price    
Outstanding at January 1, 2020 $ 3.79  
Granted 3.11  
Exercised 4.00  
Cancelled 4.27  
Outstanding at June 30, 2020 3.58 $ 3.79
Exercisable at June 30, 2020 3.60  
Vested and expected to vest at June 30, 2020 $ 3.82  
Weighted average Remaining contractual term ( in years)    
Outstanding at June 30, 2020 13 years 7 months 2 days 4 years 8 months 12 days
Exercisable at June 30, 2020 3 years 7 months 28 days  
Vested and expected to vest at June 30, 2020 10 years 9 months 29 days  
Aggregate intrinsic value    
Outstanding at January 1, 2020 $ 10,226  
Exercised 1,675  
Outstanding at June 30, 2020 8,699 $ 10,226
Exercisable at June 30, 2020 3,310  
Vested and expected to vest at June 30, 2020 $ 6,579