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Stockholders' Equity - Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value (Detail)
 12 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Vested | shares 1,785,034
Number of Shares, Unvested | shares 1,862,671
Number of Shares, Total | shares 3,647,705
Weighted Average Exercise Price Per Share, Vested | $ / shares $ 4.39
Weighted Average Exercise Price Per Share, Unvested | $ / shares 3.04
Weighted Average Exercise Price Per Share, Total | $ / shares $ 3.70
Weighted Average Remaining Contractual Life, Vested 5 years 2 months 12 days
Weighted Average Remaining Contractual Life, Unvested 9 years 4 days
Weighted Average Remaining Contractual Life, Total 7 years 1 month 24 days
Aggregate Intrinsic Value, Vested $ 1,548,344
Aggregate Intrinsic Value, Unvested 743,541
Aggregate Intrinsic Value, Total $ 2,291,885