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Fair Value Measurements - Reconciliation of Derivative Asset (Detail) (Derivative asset, USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Derivative asset
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Value, Beginning balance    $ 250,250
Receipt of instruments      
Decrease in value    (250,250)
Net settlements      
Value, Ending balance