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Stockholders' Equity - Summary of Warrant Activity (Detail) (USD $) | 12 Months Ended
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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. + Details
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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. + Details
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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 + Details
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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 + Details
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