Fair Value Measurements - Reconciliation of Derivative Liability (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Change in value	$ (5,821,796)
Exchange rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Value, Beginning balance	4,569	10,375
Issuance of instruments
Change in value	211,860	(5,806)
Net settlements
Value, Ending balance	216,429	4,569
Warrant
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Value, Beginning balance	4,091,797	626,195
Issuance of instruments		2,153,819
Change in value	5,821,796	5,066,591
Net settlements	(5,956,079)	(3,754,808)
Value, Ending balance	$ 3,957,514	$ 4,091,797