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Lease Exit Liability - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended
Jul. 16, 2008
Sep. 30, 2013
Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]      
Operating Lease 2018    
Onetime purchase payment under purchase agreement $ 5,000,000    
Additional amounts recorded   0 0
Minimum [Member]
      
Restructuring Cost and Reserve [Line Items]      
Onetime payment paid under license of product 8,000,000    
Maximum [Member]
      
Restructuring Cost and Reserve [Line Items]      
Onetime payment paid under license of product $ 12,000,000    
Convertible Preferred Stock Series D [Member]
      
Restructuring Cost and Reserve [Line Items]      
Shares issued in connection with acquisition 12,466,039