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EQUITY (Details 2)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2013
USD ($)
$ / shares
Feb. 29, 2012
USD ($)
$ / shares
shares
Sep. 30, 2013
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
tranche
$ / shares
shares
Sep. 30, 2015
$ / shares
Dec. 31, 2014
$ / shares
Performance Adjustment              
Performance adjustment ratio 0.144927536            
Common stock              
Performance Adjustment              
Performance adjustment ratio   0.5          
Series A convertible redeemable preferred stock              
Preferred stock              
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001   $ 0.001 $ 0.001 $ 0.001
Performance Adjustment              
Performance adjustment ratio   0.5          
Performance Adjustment   $ 12,239     $ 12,239    
Series B convertible redeemable preferred stock              
Preferred stock              
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001   $ 0.001 0.001 0.001
Series C convertible redeemable preferred stock              
Preferred stock              
Issuance of stock (in shares) | shares         8,658,008    
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares   0.001     $ 0.001 $ 0.001 $ 0.001
Series B Preferred Stock financing February 2012 | Series B convertible redeemable preferred stock              
Preferred stock              
Issuance of stock (in shares) | shares     27,324,237        
Issue price (in dollars per share) | $ / shares     $ 0.84        
Gross proceeds     $ 20,050        
Closing costs     $ 147        
Series C Preferred Stock financing 2013 | Series C convertible redeemable preferred stock              
Preferred stock              
Issuance of stock (in shares) | shares         8,658,008    
Gross proceeds         $ 12,000    
Closing costs         $ 45    
Number of tranches into which financing was structured | tranche         2    
Series C Preferred Stock financing 2013 | Series C convertible redeemable preferred stock | Maximum              
Preferred stock              
Shares authorized for sale and issuance (in shares) | shares         8,658,008    
Amount authorized for sale and issuance         $ 12,000    
Series C Preferred Stock financing 2013 | Series C convertible redeemable preferred stock | Stock purchase right              
Preferred stock              
Stock purchase right liability       $ 266      
Series C Preferred Stock financing 2013, first tranche | Series C convertible redeemable preferred stock              
Preferred stock              
Issuance of stock (in shares) | shares       2,886,004      
Gross proceeds       $ 4,000      
Series C Preferred Stock financing 2013, second tranche | Series C convertible redeemable preferred stock | Stock purchase right              
Fair value assumptions              
Fair value of stock (in dollars per share) | $ / shares   $ 1.27   $ 1.30 $ 1.27    
Expected life   1 month 28 days          
Volatility (as a percent)   52.00%          
Roll forward of the recurring fair value measurements of the tranche liability categorized with Level 3 inputs              
Tranche liability upon issuance   $ 266          
Change in fair value   79          
Tranche liability upon close of tranche   $ (345)          
Series C Preferred Stock financing 2013, second tranche | Series C convertible redeemable preferred stock | Stock purchase right | Minimum              
Fair value assumptions              
Expected life       4 months 6 days      
Volatility (as a percent)       53.00%      
Series C Preferred Stock financing 2013, second tranche | Series C convertible redeemable preferred stock | Stock purchase right | Maximum              
Fair value assumptions              
Expected life       5 months 5 days      
Volatility (as a percent)       60.00%      
Conversion of preferred stock into Series A Preferred Stock | Series A convertible redeemable preferred stock              
Preferred stock              
Number of shares issued in exchange for previously outstanding stock (in shares) | shares     18,464,674