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Stockholders' Equity - Summary of Warrant Activity (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	6,667	132,189	895,283
Number of Shares, Granted
Number of Shares, Exercised		(125,522)	(763,094)
Number of Shares, Cancelled
Number of Shares, Ending balance	6,667	6,667	132,189
Weighted-average exercise price, Beginning balance	$ 0.91	$ 0.91	$ 0.84
Weighted-average exercise price, Exercised		$ 0.91	$ 0.83
Weighted-average exercise price, Ending balance	$ 0.91	$ 0.91	$ 0.91

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- Definition

Share based compensation arrangement by share based payment award non option equity instruments outstanding weighted average exercise price.

+ References

No definition available.

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- Definition

Share based compensation arrangements by share based payment award non option equity instruments exercises in period weighted average exercise price.

+ References

No definition available.

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- Definition

Number of non-option equity instruments exercised by participants.

+ 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 (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of shares under non-option equity instrument agreements that were either cancelled or expired.

+ 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 (c)(1)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Net number of non-option equity instruments granted to participants.

+ 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 (c)(1)(iv)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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 (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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