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RXi Spin-off (Additional Information) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Apr. 30, 2012
Sep. 24, 2011
Related Party Transaction [Line Items]      
Proceeds from sale of shares after spin-off $ 3,911,000    
RXi [Member]
      
Related Party Transaction [Line Items]      
Cash contribution in capital     1,500,000
Proceeds from technology revenue 45,000,000    
Proceeds from technology revenue under condition one 15,000,000    
Proceeds from technology revenue under condition two 30,000,000    
Minimum estimated sales 500,000,000    
Estimated sales 1,000,000,000    
Number of shares distributed to surrenders under spin-off   66,959,894  
Number of shares retained by company under spin-off   33,476,595  
Lock up period of shares under spin-off 1 year    
Expiration date of shares under spin-off Apr. 27, 2013    
Number of shares sold by company after spin-off 1,115,887    
Retained price per shares under spin-off $ 2.40    
Retained value of shares under spin-off $ 2,678,000