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SHAREHOLDERS' EQUITY (Tables)
6 Months Ended
Jun. 30, 2019
SHAREHOLDERS' EQUITY [Abstract]  
Schedule of Weighted-average Assumptions Used to Estimate Fair Value of Options Granted
The following table presents the assumptions used to estimate the fair value of the options granted in the periods presented:

   
Six months ended
June 30,
 
   
2019
   
2018
 
   
Unaudited
 
             
Volatility
   
54%-55%

   
53%-55%

Risk-free interest rate
   
2.2%-2.5%

   
2.6%-2.8%

Dividend yield
   
0%

   
0%

Expected life (years)
   
4.9-5.1
     
4.9-5