Fair Value Measurements & Derivative Instruments - Reconciliation of Derivative Liability (Detail) (USD $)	6 Months Ended	12 Months Ended
Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2011
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Change in value	$ 244,801
Exchange rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Value, Beginning balance	10,372	30,892
Issuance of instruments			100,650
Change in value	(9,675)	(20,520)	(69,758)
Net settlements
Value, Ending balance	697	10,372	30,892
Warrants [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Value, Beginning balance	626,195	907,233
Issuance of instruments	1,137,896
Issuance of instruments	1,015,923
Change in value	(244,801)	(281,038)
Value, Ending balance	$ 2,535,213	$ 626,195

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Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Issues that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

+ Details

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- Definition

Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

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