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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) (USD $) | 12 Months Ended
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Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Number of Shares, Vested | 1,454,952
Number of Shares, Unvested | 1,370,012
Number of Shares, Total | 2,824,964
Weighted Average Exercise Price Per Share, Vested | $ 3.26
Weighted Average Exercise Price Per Share, Unvested | $ 4.97
Weighted Average Exercise Price Per Share, Total | $ 4.09
Weighted Average Remaining Contractual Life, Vested | 6 years 18 days
Weighted Average Remaining Contractual Life, Unvested | 8 years 7 months 10 days
Weighted Average Remaining Contractual Life, Total | 7 years 3 months 15 days
Aggregate Intrinsic Value, Vested | $ 4,177,830
Aggregate Intrinsic Value, Unvested | 1,821,844
Aggregate Intrinsic Value, Total | $ 5,999,673

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