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Stockholders' Equity (Details 2) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Stock-based compensation expense related to stock options and restricted stock unit awards    
Stock-based compensation expense included in operating expenses $ 2,599,858 $ 1,271,238
Sales and marketing [Member]
   
Stock-based compensation expense related to stock options and restricted stock unit awards    
Stock-based compensation expense included in operating expenses 471,716 235,710
Research and development [Member]
   
Stock-based compensation expense related to stock options and restricted stock unit awards    
Stock-based compensation expense included in operating expenses 592,249 290,239
General and administrative [Member]
   
Stock-based compensation expense related to stock options and restricted stock unit awards    
Stock-based compensation expense included in operating expenses $ 1,535,893 $ 745,289