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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
	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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