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DEBT (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 28, 2012
Sep. 30, 2014
Aug. 31, 2014
Feb. 28, 2014
Jan. 31, 2014
Feb. 28, 2013
Oct. 31, 2012
Aug. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Loan and Security Agreements                    
Maximum borrowing capacity $ 1,000                  
Proceeds from notes payable, net of original note payoff                 $ 7,056 $ 500
Common stock warrant, Silicon Valley Bank, Original Term Loan                    
Loan and Security Agreements                    
Common stock that may be purchased upon exercise of warrant (in shares) 23,810                  
Exercise price of warrant (in dollars per share) $ 0.07                  
Common stock warrant, Silicon Valley Bank, Term Loan, Amendment No. 1                    
Loan and Security Agreements                    
Common stock that may be purchased upon exercise of warrant (in shares)       14,430            
Exercise price of warrant (in dollars per share)       $ 0.05            
Common stock warrant, Silicon Valley Bank, Term Loan, Amendment No. 2                    
Loan and Security Agreements                    
Common stock that may be purchased upon exercise of warrant (in shares)     86,580              
Exercise price of warrant (in dollars per share)     $ 0.05              
Term loan | Silicon Valley Bank loan agreement                    
Loan and Security Agreements                    
Maximum borrowing capacity $ 1,000                  
Amount borrowed           $ 500 $ 250 $ 250    
Initial period of interest only payments 12 months                  
Subsequent period of principal and interest payments 36 months                  
Deferred financing costs $ 38       $ 22          
Financing costs repaid         16          
Deferred financing costs, net                 7 15
Outstanding amount of loans                 8,000 958
Interest expense on notes payable                 $ 208 $ 62
Term loan | Silicon Valley Bank loan agreement | Prime                    
Loan and Security Agreements                    
Variable interest rate margin (as a percent)                 2.25% 2.25%
Interest rate (as a percent) 5.50%                  
Term loan | Silicon Valley Bank loan agreement, Amendment No. 1                    
Loan and Security Agreements                    
Maximum borrowing capacity         $ 6,000          
Amount borrowed       $ 2,000            
Proceeds from notes payable, net of original note payoff       $ 1,056            
Initial period of interest only payments       12 months            
Subsequent period of principal and interest payments       36 months            
Term loan | Silicon Valley Bank loan agreement, Amendment No. 1 | Prime                    
Loan and Security Agreements                    
Variable rate basis         1.75%          
Interest rate (as a percent)       5.00%            
Term loan | Silicon Valley Bank loan agreement Amendment No. 2                    
Loan and Security Agreements                    
Maximum borrowing capacity     $ 8,000              
Amount borrowed   $ 3,000 $ 3,000              
Initial period of interest only payments     12 months              
Subsequent period of principal and interest payments     36 months              
Term loan | Silicon Valley Bank loan agreement Amendment No. 2 | Prime                    
Loan and Security Agreements                    
Interest rate (as a percent)     5.00%