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Fair Value Measurements - Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Marketable securities $ 10,698,271    
Contingent consideration 1,595,273 173,621   
Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Cash and cash equivalents 19,114,444 3,377,288  
Marketable securities 10,698,271 106,500  
Derivative assets    250,250  
Derivative liabilities 4,096,363 647,213  
Contingent consideration 1,595,273 173,621  
Level 1 | Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Cash and cash equivalents 19,114,444 3,377,288  
Marketable securities 10,698,271 106,500  
Derivative assets       
Level 2 | Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Derivative assets       
Level 3 | Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Derivative assets    250,250  
Derivative liabilities 4,096,363 647,213  
Contingent consideration $ 1,595,273 $ 173,621