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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
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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 + Details
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- Definition 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 + Details
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- Definition 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 + Details
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- Definition 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 + Details
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