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Discontinued Operations - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended
Jan. 31, 2011
Dec. 31, 2009
Dec. 31, 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    
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     2013-01-17
Convertible bond, due date     Jan. 17, 2014