Basis of Presentation and Significant Accounting Policies - Summary of Option Activity (Detail) (USD $)	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options, Outstanding Beginning Balance	1,240,941
Options, Granted	291,654
Options, Exercised	0
Options, Forfeited	(27,833)
Options, Outstanding Ending Balance	1,504,762	1,240,941
Options, Exercisable Ending Balance	881,432
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 10.31
Weighted Average Exercise Price, Granted	$ 9.33
Weighted Average Exercise Price, Forfeited	$ 13.16
Weighted Average Exercise Price, Outstanding Ending Balance	$ 10.07	$ 10.31
Weighted Average Exercise Price, Exercisable Ending Balance	$ 10.57
Weighted Average Remaining Contractual Period in Years, Granted	9 years 9 months 18 days
Weighted Average Remaining Contractual Period in Years, Forfeited	2 years 2 months 12 days
Weighted Average Remaining Contractual Period in Years, Outstanding Ending Balance	7 years 3 months 18 days	6 years 10 months 24 days
Weighted Average Remaining Contractual Period in Years, Exercisable Ending Balance	5 years 10 months 24 days