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SHAREHOLDERS' EQUITY (Schedule of Options and RSUs Outstanding Which have been Separated into Ranges of Exercise Price) (Details) - $ / shares
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
RSU    
Ranges of Exercise Price [Line Items]    
RSUs outstanding (in shares) 194,702  
Options    
Ranges of Exercise Price [Line Items]    
Options exercisable (in shares) 1,081,735  
Options exercisable weighted average remaining contractual life (years) 6 years 5 months 19 days  
Stock Options and RSUs    
Ranges of Exercise Price [Line Items]    
Options outstanding weighted average remaining contractual life (years) 7 years 4 months 10 days  
Options and RSU's outstanding (in shares) 2,145,111 2,251,014
$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 9 months 15 days  
Options exercisable (in shares) 34,377  
Options exercisable weighted average remaining contractual life (years) 3 years 9 months 15 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) 336,905  
Options outstanding weighted average remaining contractual life (years) 5 years 1 month 6 days  
Options exercisable (in shares) 334,997  
Options exercisable weighted average remaining contractual life (years) 5 years 1 month 2 days  
$1.48 | Options    
Ranges of Exercise Price [Line Items]    
Range of exercise price- minimum (in USD per share) $ 1.48  
Range of exercise price, maximum (in USD per share) $ 1.48  
Options outstanding (in shares) 384,323  
Options outstanding weighted average remaining contractual life (years) 6 years 5 months 1 day  
Options exercisable (in shares) 307,132  
Options exercisable weighted average remaining contractual life (years) 6 years 5 months 16 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) 720,618  
Options outstanding weighted average remaining contractual life (years) 8 years 5 months 27 days  
Options exercisable (in shares) 240,800  
Options exercisable weighted average remaining contractual life (years) 8 years 11 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) 220,056  
Options outstanding weighted average remaining contractual life (years) 9 years 1 month 10 days  
Options exercisable (in shares) 14,558  
Options exercisable weighted average remaining contractual life (years) 9 years 11 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) 254,130  
Options outstanding weighted average remaining contractual life (years) 7 years 6 months 15 days  
Options exercisable (in shares) 149,871  
Options exercisable weighted average remaining contractual life (years) 7 years 4 months 28 days