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FAIR VALUE MEASUREMENTS - Warrants Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Reclassification of derivative liability to equity upon exercise of warrants $ (14,500) $ (14,700)
Warrants liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance   38,810
Reclassification of derivative liability to equity upon exercise of warrants   (14,699)
Change in estimated fair value of liability classified warrants   4,849
Ending Balance $ 28,960 $ 28,960