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Fair Value Measurements & Derivative Instruments - Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
Mar. 31, 2013
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 30,011 $ 280,261
Contingent consideration 173,621 173,621
Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 3,313,310 3,377,288
Marketable securities    106,500
Derivative assets    250,250
Derivative liabilities 2,535,910 647,213
Contingent consideration 173,621 173,621
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 3,313,310 3,377,288
Marketable securities    106,500
Derivative assets      
Derivative liabilities      
Contingent consideration      
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents      
Marketable securities      
Derivative assets      
Derivative liabilities      
Contingent consideration      
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents      
Marketable securities      
Derivative assets    250,250
Derivative liabilities 2,535,910 647,213
Contingent consideration $ 173,621 $ 173,621