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STOCK-BASED COMPENSATION (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted stock awards      
Unvested at beginning of year (in shares) 15,387    
Granted (in shares) 194,694    
Vested (in shares) (128,955)    
Unvested at end of year (in shares) 81,126 15,387  
Weighted-Average Grant Date Fair Value      
Unvested at beginning of year (in dollars per share) $ 0.69    
Granted (in dollars per share) 5.73    
Vested (in dollars per share) 5.13    
Unvested at end of year (in dollars per share) $ 5.73 $ 0.69  
Restricted stock      
Restricted stock awards      
Unvested at beginning of year (in shares) 15,387 55,298 203,342
Granted (in shares)   10,869  
Vested (in shares)   (50,780) (89,308)
Performance Adjustment (in shares)     (58,736)
Unvested at end of year (in shares)   15,387 55,298
Weighted-Average Grant Date Fair Value      
Unvested at beginning of year (in dollars per share) $ 0.69 $ 0.69 $ 0.62
Granted (in dollars per share)   1.24  
Vested (in dollars per share)   0.62 0.55
Performance Adjustment (in dollars per share)     0.62
Unvested at end of year (in dollars per share)   $ 0.69 $ 0.69
Unrecognized compensation cost      
Unrecognized stock-based compensation expense   $ 26 $ 73
Period over which unrecognized compensation cost is expected to be recognized as expense   2 months 12 days 1 year 2 months 12 days