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Stockholders' Equity - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
May. 15, 2015
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Apr. 18, 2014
Equity [Abstract]            
Preferred stock, shares authorized   10,000,000 10,000,000   10,000,000  
Preferred stock, par value   $ 0.001 $ 0.001   $ 0.001  
Preferred stock, shares issued   0 0   0  
Preferred stock, shares outstanding   0 0   0  
Common stock, shares authorized   200,000,000 200,000,000   200,000,000  
Common stock, par value   $ 0.001 $ 0.001   $ 0.001  
Common stock, shares issued   111,714,938 111,714,938   111,601,304 1,192,500
Common stock, shares outstanding   111,714,938 111,714,938   111,601,304  
Common stock issued for services, Shares     0 20,408    
Common stock issued for services, Value       $ 50,000    
Common stock issued for services, Expense       33,333    
Common stock issued for services, Prepaid expenses       $ 16,667    
Employee stock purchase plan expense   $ 25,102 $ 36,924      
Shares issued for Employee Stock Purchase Plan options, Shares 57,134   57,134