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Stockholders' Equity (Details) (USD $)
3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Stock-based compensation expense related to stock options and restricted stock unit awards    
Stock-based compensation expense included in operating expenses $ 656,534 $ 501,697
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 76,653 69,563
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 123,578 107,219
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 $ 456,303 $ 324,915