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Discontinued Operations - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2009
Sep. 30, 2012
Discontinued Operations [Line Items]      
Non cash consideration received in sale of interest in subsidiary $ 2,500,000    
Contingent amount to be received under discontinued business 140,000,000    
Convertible bond, face value     2,500,000
Period of revenue milestones considered for contingent payment     10 years
Upfront consideration of discontinued operation     350,000
Reimbursements of patent and license expenses   80,000  
Convertible Bond [Member]
      
Discontinued Operations [Line Items]      
Convertible bond, face value $ 2,500,000    
Convertible bond, conversion date     Jan. 17, 2012
Convertible bond, redeemable date     January 17, 2013
Convertible bond, due date     Jan. 17, 2014