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Stockholders' Equity - Stock-Based Compensation Expense Related to Stock Options and RSUs (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in operating expenses	$ 685,633	$ 830,986	$ 2,045,767	$ 1,983,870
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in operating expenses	102,672	214,140	277,976	394,881
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in operating expenses	161,431	187,132	447,491	470,958
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense included in operating expenses	$ 421,530	$ 429,714	$ 1,320,300	$ 1,118,031