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Fair Value Measurements - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
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Mar. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
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Mar. 31, 2015
USD ($)
Sep. 30, 2011
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Sep. 30, 2015
USD ($)
Jan. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2010
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                  
Short term investments | $ $ 11,160,442   $ 11,160,442     $ 17,539,902      
Fair value of investments | $ $ 11,037,930   $ 11,037,930     $ 17,234,960      
Warrants outstanding 1,466,437   1,466,437            
Non-cash gain (loss) from change in fair value of the derivative liability | $ $ 363,285 $ 191,910 $ 341,711 $ 2,371,561          
Ablaris Therapeutics                  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                  
Warrants outstanding 500,000   500,000            
Non-cash gain (loss) from change in fair value of the derivative liability | $ $ 6,650 $ 22,936 $ 4,700 $ 179,555          
Duration of exchange rights     7 years            
Exchange right convertible conversion ratio for first year     0.06            
Exchange right convertible conversion ratio for second year     0.04            
Exchange right convertible conversion ratio for third year     0.03            
Exchange right convertible conversion ratio for fourth year     0.02            
Exchange right convertible conversion ratio for fifth year and beyond     0.01            
Number of exchange right sold         675,000        
2010 Warrants                  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                  
Warrants issued to acquire Common Stock                 329,649
Warrants expired 24,324   24,324            
2012 Warrants                  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                  
Warrants issued to acquire Common Stock               912,543  
Warrants outstanding 265,161   265,161            
2013 Warrants                  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                  
Warrants issued to acquire Common Stock             833,530    
Warrants outstanding 12,123   12,123