Basis of Presentation and Significant Accounting Policies - Summary of Option Activity (Detail) (USD $)	3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding Beginning Balance	997,045
Options, Granted	249,900
Options, Exercised	(4,824)
Options, Forfeited	(6,133)
Options, Outstanding Ending Balance	1,235,988	997,045
Options, Exercisable Ending Balance	708,101
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 10.54
Weighted Average Exercise Price, Granted	$ 9.91
Weighted Average Exercise Price, Exercised	$ 7.24
Weighted Average Exercise Price, Forfeited	$ 13.41
Weighted Average Exercise Price, Outstanding Ending Balance	$ 10.41	$ 10.54
Weighted Average Exercise Price, Exercisable Ending Balance	$ 11.51
Weighted Average Remaining Contractual Period in Years, Granted	9 years 9 months 18 days
Weighted Average Remaining Contractual Period in Years, Exercised	6 years 2 months 12 days
Weighted Average Remaining Contractual Period in Years, Forfeited	6 years 4 months 24 days
Weighted Average Remaining Contractual Period in Years, Outstanding Beginning Balance	7 years 1 month 6 days	6 years 8 months 12 days
Weighted Average Remaining Contractual Period in Years, Exercisable Ending Balance	5 years 6 months