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Fair Value Measurements & Derivative Instruments - Assumptions Used in Valuing Derivative Liabilities (Detail)
6 Months Ended 12 Months Ended
Mar. 31, 2013
Sep. 30, 2012
2010 Warrants [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk free interest rate 0.36% 0.31%
Expected life 2 years 8 months 12 days 3 years 2 months 12 days
Dividend yield      
Volatility 69.00% 100.00%
2012 Warrants [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk free interest rate 0.77%  
Expected life 4 years 8 months 12 days  
Dividend yield      
Volatility 69.00%  
2013 Warrants [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk free interest rate 0.77%  
Expected life 4 years 9 months 18 days  
Dividend yield      
Volatility 69.00%  
Exchange rights [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk free interest rate 0.72% 0.62%
Expected life 4 years 9 months 18 days 5 years 3 months 18 days
Dividend yield      
Volatility 69.00% 100.00%