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Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 6 Months Ended
May 07, 2014
Apr. 18, 2014
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Oct. 28, 2013
Mar. 29, 2013
Oct. 31, 2012
Maximum [Member]
Schedule Of Stockholders Equity [Line Items]                
Preferred stock, shares authorized     10,000,000   10,000,000      
Preferred stock, par value     $ 0.001   $ 0.001      
Preferred stock, shares issued     0   0      
Preferred stock, shares outstanding     0   0      
Common stock, shares authorized     200,000,000   200,000,000 200,000,000    
Common stock, par value     $ 0.001   $ 0.001   $ 3.00  
Common stock, shares issued   1,192,500 97,050,674   95,814,565      
Common stock, shares outstanding     97,050,674   95,814,565      
Common stock issued for services, Shares     20,408 17,226        
Common stock issued for services, Value     $ 50,000 $ 50,780        
Common stock issued for services, Expense     33,333          
Common stock issued for services, Prepaid expense     16,667          
Warrant conversions, shares   1,192,500 1,192,500          
Warrant conversions, amount   2,385,000 2,385,000          
Warrant to purchase common stock, per share $ 2.65 $ 2.00 $ 2.00          
Additional warrants issued     248,500          
Number of shares, exercisable right 100,000   1,441,000       6,905,576  
Number of shares available for grant               7,500,000
Stock-based compensation     359,456 1,573,010        
Options outstanding, intrinsic value     12,331,935          
Options exercisable, intrinsic value     8,699,835          
Unvested share-based awards     $ 2,019,103