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Stockholders' Equity (Details) (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-based compensation expense related to stock options and restricted stock unit awards        
Stock-based compensation expense included in operating expenses $ 830,986 $ 361,763 $ 1,983,870 $ 891,347
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 214,140 65,324 394,881 168,471
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 187,132 76,892 470,958 196,666
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 $ 429,714 $ 219,547 $ 1,118,031 $ 526,210