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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, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Vested | shares 2,107,825
Number of Shares, Unvested | shares 907,549
Number of Shares, Total | shares 3,015,374
Weighted Average Exercise Price Per Share, Vested | $ / shares $ 4.31
Weighted Average Exercise Price Per Share, Unvested | $ / shares 3.11
Weighted Average Exercise Price Per Share, Total | $ / shares $ 3.95
Weighted Average Remaining Contractual Life, Vested 5 years 6 months 18 days
Weighted Average Remaining Contractual Life, Unvested 8 years 3 months 29 days
Weighted Average Remaining Contractual Life, Total 6 years 4 months 21 days
Aggregate Intrinsic Value, Vested | $ $ 9,491,803
Aggregate Intrinsic Value, Unvested | $ 4,700,241
Aggregate Intrinsic Value, Total | $ $ 14,192,044