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Stockholders' Equity - Summary of Warrants Issued and Outstanding (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Mar. 29, 2013
Class of Warrant or Right [Line Items]      
Exercise price of warrants $ 0.37 $ 0.37 $ 0.37
Shares of Common Stock    1,381,113  
Exercisable Warrants [Member]
      
Class of Warrant or Right [Line Items]      
Shares of Common Stock       
Exercisable Warrants [Member] | Warrant 1-1 [Member]
      
Class of Warrant or Right [Line Items]      
Date of Issuance Mar. 22, 2012    
Date of Expiration 2017-03-21    
Exercise price of warrants $ 0.37    
Shares of Common Stock 1,381,115    
Exercisable Warrants [Member] | Warrant 1-5 [Member]
      
Class of Warrant or Right [Line Items]      
Date of Issuance Oct. 10, 2012    
Date of Expiration 2017-10-09    
Exercise price of warrants $ 0.37    
Shares of Common Stock 5,524,461    
Exercisable Warrants [Member] | Warrant 1-6 [Member]
      
Class of Warrant or Right [Line Items]      
Date of Issuance Mar. 29, 2013    
Date of Expiration 2017-03-21    
Exercise price of warrants $ 0.37    
Shares of Common Stock 500,000    
Exercisable Warrants [Member] | Less warrants exercised [Member]
      
Class of Warrant or Right [Line Items]      
Shares of Common Stock (7,405,576)    
Contingent Warrants [Member]
      
Class of Warrant or Right [Line Items]      
Shares of Common Stock       
Contingent Warrants [Member] | Warrant 1-2 [Member]
      
Class of Warrant or Right [Line Items]      
Date of Issuance Mar. 22, 2012    
Date of Expiration 2017-03-21    
Exercise price of warrants $ 0.37    
Shares of Common Stock 345,278    
Contingent Warrants [Member] | Warrant 1-3 [Member]
      
Class of Warrant or Right [Line Items]      
Date of Issuance Mar. 22, 2012    
Date of Expiration 2017-03-21    
Exercise price of warrants $ 0.37    
Shares of Common Stock 345,278    
Contingent Warrants [Member] | Warrant 1-4 [Member]
      
Class of Warrant or Right [Line Items]      
Date of Issuance Mar. 22, 2012    
Date of Expiration 2017-03-21    
Exercise price of warrants $ 0.37    
Shares of Common Stock 690,557    
Contingent Warrants [Member] | Warrants Cancelled [Member]
      
Class of Warrant or Right [Line Items]      
Shares of Common Stock (1,381,113)