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Stockholders' Equity - Stock-Based Compensation Expense Related to Stock Options and RSUs (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	$ 2,791,862	$ 2,599,858	$ 1,271,238
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	433,130	471,716	235,710
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	617,377	592,249	290,239
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to employee stock options included in operating expenses	$ 1,741,355	$ 1,535,893	$ 745,289