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Stockholders' Equity (Details) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Stock-based compensation expense related to stock options and restricted stock unit awards        
Stock-based compensation expense included in operating expenses $ 703,599 $ 651,187 $ 1,360,133 $ 1,152,884
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 98,651 111,178 175,303 180,741
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 162,481 176,607 286,060 283,826
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 $ 442,467 $ 363,402 $ 898,770 $ 688,317