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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, 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

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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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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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