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Acquisitions - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 125 Months Ended 12 Months Ended
Oct. 21, 2012
Oct. 21, 2011
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2013
Roche
Oct. 21, 2011
Roche
Sep. 30, 2013
Roche
Minimum
Sep. 30, 2013
Roche
Maximum
Apr. 05, 2012
Alvos acquisition
Business Acquisition [Line Items]                      
Issue of promissory note to Roche               $ 50,000      
Shares issued               1,288,158     315,457
Applicable out-license term             90 days        
Percentage of royalty liability             3.00%        
Obligation to pay royalties     later of (i) the expiration of the last to expire patent right related to such product candidate that was transferred in the Transaction and (ii) ten years after the first commercial sale of such product candidate.                
Cash payments to Roche                 2,500,000    
Cash payments to Roche                   6,000,000  
Net present value of contingent consideration   84,935                  
Gain on purchase             1,576,106        
Issue of additional shares of Common Stock, Value                     23,500,000
Contingent consideration     1,595,273 1,595,273 173,621      84,935     88,686
Contingent consideration – fair value adjustments $ (986,049)   $ 1,421,652 $ 1,421,652