Basis of Presentation and Significant Accounting Policies - Summary of Status of Company's Non-Vested Shares (Detail) (USD $)	6 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding Beginning Balance	1,240,941
Shares, Granted	305,404
Options, Forfeited	(54,035)
Options, Outstanding Ending Balance	1,485,443
Weighted-Average Grant Date Fair Value, Granted	$ 3.19
Non-Vested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding Beginning Balance	539,519
Shares, Granted	305,404
Shares, Vested	(225,372)
Options, Forfeited	(14,854)
Options, Outstanding Ending Balance	604,697
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 3.29
Weighted-Average Grant Date Fair Value, Granted	$ 3.19
Weighted-Average Grant Date Fair Value, Vested	$ 2.98
Weighted-Average Grant Date Fair Value, Forfeited	$ 2.00
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	$ 3.30