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FAIR VALUE - Fair Value Measurements of Common Stock Warrants Using Significant Unobservable Inputs (Level 3) (Details) - Common Stock Warrants - USD ($)
 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Fair Value Measurements of Common Stock Warrants Using Significant Unobservable Inputs (Level 3)    
Balance at October 1, 2014 and 2013 $ 1,096,412 $ 2,643,449
Adjustment resulting from change in fair value [1] 2,994,540 $ 1,663,316
Removal of warrant upon repurchase $ (4,090,952)  
Reclassification to equity upon exercise   $ (2,455,042)
Balance at June 30,   $ 1,851,723
[1] Adjustment resulting from change in fair value is the amount of total gains or losses for the period attributable to the change in unrealized gains or losses relating to warrant liabilities held at the reporting date and realized gains or losses at the date of exercise. The gain or loss is recorded in change in fair value of warrant liability in the accompanying condensed consolidated statements of operations.