Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Liabilities Measured at Fair Value Using Level 3 Significant Unobservable Inputs) (Details)

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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Liabilities Measured at Fair Value Using Level 3 Significant Unobservable Inputs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2014
Warrant Liabilities      
Reconciliation of all liabilities      
Increase to Additional paid-in capital     $ 3,700
Warrant Liabilities | Other income      
Reconciliation of all liabilities      
Change in fair value $ 0 $ (382)  
Significant Unobservable Inputs (Level 3) | Warrant Liabilities      
Reconciliation of all liabilities      
Balance at beginning of the period   3,276 3,276
Change in fair value   382  
Write-off due to conversion and IPO   (3,658)  
Balance at end of the period 0 0  
Significant Unobservable Inputs (Level 3) | Senior Convertible Note Derivative Liability      
Reconciliation of all liabilities      
Balance at beginning of the period   5,057 5,057
Change in fair value 0 1,633  
Write-off due to conversion and IPO   (6,690)  
Balance at end of the period $ 0 $ 0  
Significant Unobservable Inputs (Level 3) | Senior Convertible Note Derivative Liability | Other income      
Reconciliation of all liabilities      
Change in fair value     1,200
Increase to Additional paid-in capital     $ 5,500