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Fair Value Measurements - Assumptions Used in Valuing Derivative Liabilities (Detail)	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014 2010 Warrants	Sep. 30, 2013 2010 Warrants	Mar. 31, 2014 2012 Warrants	Sep. 30, 2013 2012 Warrants	Mar. 31, 2014 2013 Warrants	Sep. 30, 2013 2013 Warrants	Mar. 31, 2014 Exchange rights	Sep. 30, 2013 Exchange rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Risk free interest rate	0.44%	0.33%	1.31%	1.39%	1.31%	1.39%	1.31%	1.39%
Expected life	2 years	2 years 2 months 12 days	3 years 8 months 12 days	4 years 2 months 12 days	3 years 9 months 18 days	4 years 3 months 18 days	3 years 9 months 18 days	4 years 3 months 18 days
Dividend yield
Volatility	69.00%	69.00%	69.00%	69.00%	69.00%	69.00%	69.00%	69.00%

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- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ 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 (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ 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 (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Risk-free interest rate assumption used in valuing an instrument.

+ 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 (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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