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Stock-Based Compensation - Summarize Information about Stock Options (Detail)
 12 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Options Outstanding, beginning balance | shares 3,850,840
Number of Options Outstanding, Granted | shares 1,729,000
Number of Options Outstanding, Cancelled | shares (115,442)
Number of Options Outstanding, Exercised | shares (28,758)
Number of Options Outstanding, ending balance | shares 5,435,640
Number of Options Outstanding, Exercisable | shares 2,683,856
Weighted Average Exercise Price Per Share, beginning balance | $ / shares $ 6.99
Weighted Average Exercise Price Per Share, Granted | $ / shares 6.35
Weighted Average Exercise Price Per Share, Cancelled | $ / shares 11.38
Weighted Average Exercise Price Per Share, Exercised | $ / shares 3.54
Weighted Average Exercise Price Per Share, ending balance | $ / shares 6.71
Weighted Average Exercise Price Per Share, Exercisable | $ / shares $ 6.07
Weighted Average Remaining Contractual Term 7 years 10 months 24 days
Weighted Average Remaining Contractual Term, Exercisable 7 years
Aggregate Intrinsic Value | $ $ 5,520,448
Aggregate Intrinsic Value, Exercisable | $ $ 3,554,184