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SHAREHOLDERS' EQUITY (Schedule of Options and RSUs Outstanding Which have been Separated into Ranges of Exercise Price) (Details) - $ / shares
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Stock Options and RSUs    
Ranges of Exercise Price [Line Items]    
Options outstanding weighted average remaining contractual life (years) 7 years 6 months 15 days  
Options and RSU's outstanding (in shares) 2,635,209 2,251,014
RSU    
Ranges of Exercise Price [Line Items]    
RSUs outstanding (in shares) 362,933  
Options    
Ranges of Exercise Price [Line Items]    
Options exercisable (in shares) 1,217,605  
Options exercisable weighted average remaining contractual life (years) 6 years 4 months 10 days  
$0.82 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price, minimum (in USD per share) $ 0.82  
Range of exercise price, maximum (in USD per share) $ 0.82  
Options outstanding (in shares) 34,377  
Options outstanding weighted average remaining contractual life (years) 3 years 3 months 11 days  
Options exercisable (in shares) 34,377  
Options exercisable weighted average remaining contractual life (years) 3 years 3 months 11 days  
$1.32 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price, minimum (in USD per share) $ 1.32  
Range of exercise price, maximum (in USD per share) $ 1.32  
Options outstanding (in shares) 336,895  
Options outstanding weighted average remaining contractual life (years) 4 years 11 months 19 days  
Options exercisable (in shares) 331,301  
Options exercisable weighted average remaining contractual life (years) 4 years 10 months 24 days  
$1.47 - $2.20 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price, minimum (in USD per share) $ 1.47  
Range of exercise price, maximum (in USD per share) $ 2.20  
Options outstanding (in shares) 770,909  
Options outstanding weighted average remaining contractual life (years) 8 years 1 month 2 days  
Options exercisable (in shares) 327,940  
Options exercisable weighted average remaining contractual life (years) 6 years 1 month 21 days  
$6.80 - $8.99 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price, minimum (in USD per share) $ 6.80  
Range of exercise price, maximum (in USD per share) $ 8.99  
Options outstanding (in shares) 681,254  
Options outstanding weighted average remaining contractual life (years) 8 years 1 month 17 days  
Options exercisable (in shares) 298,625  
Options exercisable weighted average remaining contractual life (years) 7 years 8 months 9 days  
$9.22 - $10.98 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price, minimum (in USD per share) $ 9.22  
Range of exercise price, maximum (in USD per share) $ 10.98  
Options outstanding (in shares) 202,983  
Options outstanding weighted average remaining contractual life (years) 8 years 7 months 10 days  
Options exercisable (in shares) 65,706  
Options exercisable weighted average remaining contractual life (years) 8 years 22 days  
$19.62 - $20.97 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price, minimum (in USD per share) $ 19.62  
Range of exercise price, maximum (in USD per share) $ 20.97  
Options outstanding (in shares) 245,858  
Options outstanding weighted average remaining contractual life (years) 7 years 4 months 17 days  
Options exercisable (in shares) 159,656  
Options exercisable weighted average remaining contractual life (years) 7 years 3 months 29 days