Fair Value Measurements - Reconciliation of Derivative Liability (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Change in value	$ (102,763)	$ 737,072	$ 2,268,798	$ (5,680,540)
Exchange rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Value, Beginning balance			216,429	4,569	$ 4,569
Change in value			(177,605)		211,860
Net settlements			(3,072)
Value, Ending balance	35,752		35,752		216,429
Warrant
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Value, Beginning balance			3,957,514	$ 4,091,797	4,091,797
Change in value			(2,268,798)		5,821,796
Net settlements					(5,956,079)
Value, Ending balance	$ 1,688,716		$ 1,688,716		$ 3,957,514