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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
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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

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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