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STOCK-BASED COMPENSATION (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock option activity        
Outstanding at beginning of year (in shares) 281,029      
Granted (in shares) 1,197,452      
Exercised (in shares) (121,729)      
Cancelled (in shares) (506)      
Outstanding at end of period (in shares) 1,356,246 281,029    
Exercisable at end of period (in shares) 208,438      
Vested and expected to vest at end of period (in shares) 1,341,543      
Weighted average exercise price per share        
Outstanding at beginning of year (in dollars per share) $ 0.69      
Granted (in dollars per share) 10.47      
Exercised (in dollars per share) 3.89      
Cancelled (in dollars per share) 2.06      
Outstanding at end of period (in dollars per share) 9.04 $ 0.69    
Exercisable at end of period (in dollars per share) 2.65      
Vested and expected to vest at end of period (in dollars per share) $ 9.13      
Stock option activity, additional information        
Outstanding at end of period, Weighted-average remaining contractual term 9 years 2 months 12 days      
Exercisable at end of period, Weighted-average remaining contractual term 7 years 10 months 24 days      
Vested and expected to vest at end of period, weighted-average remaining contractual term 9 years 2 months 12 days      
Outstanding at end of period, Aggregate intrinsic value $ 17,722      
Exercisable at end of period, Aggregate intrinsic value 4,056      
Vested and expected to vest at end of period, Aggregate intrinsic value $ 18,595      
Stock options        
Stock option activity        
Outstanding at beginning of year (in shares) 281,029 229,791 323,488  
Granted (in shares)   89,641 146,730  
Exercised (in shares)   (32,390) (1,077)  
Cancelled (in shares)   (6,013) (9,559)  
Modification (in shares)     (229,791)  
Outstanding at end of period (in shares)   281,029 229,791 323,488
Exercisable at end of period (in shares)   121,304    
Vested and expected to vest at end of period (in shares)   247,139    
Weighted average exercise price per share        
Outstanding at beginning of year (in dollars per share) $ 0.69 $ 1.17 $ 1.73  
Granted (in dollars per share)   0.28 0.48  
Exercised (in dollars per share)   2.21 0.62  
Cancelled (in dollars per share)   4.42 2.76  
Modification (in dollars per share)     1.17  
Outstanding at end of period (in dollars per share)   0.69 $ 1.17 $ 1.73
Exercisable at end of period (in dollars per share)   1.38    
Vested and expected to vest at end of period (in dollars per share)   $ 0.83    
Stock option activity, additional information        
Outstanding at end of period, Weighted-average remaining contractual term   7 years 5 months 27 days 7 years 7 days 6 years 11 months 9 days
Exercisable at end of period, Weighted-average remaining contractual term   4 years 3 months 22 days    
Vested and expected to vest at end of period, weighted-average remaining contractual term   4 years 3 months 22 days    
Outstanding at end of period, Aggregate intrinsic value   $ 1,505 $ 117 $ 8
Exercisable at end of period, Aggregate intrinsic value   570    
Vested and expected to vest at end of period, Aggregate intrinsic value   1,293    
Unrecognized compensation cost related to outstanding options   $ 215 $ 40  
Period over which unrecognized compensation cost is expected to be recognized as expense   1 year 1 year 1 month 6 days  
Weighted average fair value of vested options (in dollars per share)   $ 1.93    
Employee stock options        
Stock option activity, additional information        
Weighted-average grant date fair value per share of employee option grants (in dollars per share)   $ 0.76 $ 0.28