Preferred stock and common stock (Detail) - Warrant activity (Warrant [Member])	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Warrant [Member]
Warrants Outstanding	10,248,785	974,474
Warrants Granted	343,613,200	9,710,000
Warrants Expired	(5,276,285)	(435,689)
Warrants Outstanding	348,585,700	10,248,785

Number of shares under non-option equity instrument agreements for which rights to exercise lapsed.

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Period Type:	duration

- Definition

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

+ References

+ Details

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- Definition

Number of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

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

+ Details

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Data Type:	xbrli:sharesItemType
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