Fair Value Measurements - Reconciliation of Derivative Liability (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Change in value	$ 363,285	$ 191,910	$ 341,711	$ 2,371,561
Exchange rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Value, Beginning balance			28,802
Change in value			(4,700)
Value, Ending balance	24,102		24,102
Warrant
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Value, Beginning balance			1,272,802
Change in value			(341,711)
Value, Ending balance	$ 931,091		$ 931,091