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Summary of Weighted Average Assumptions to Value Stock Options Granted (Detail) (2011 Equity Incentive Plan, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term of options 0 years 5 years
Exercise Price $ 0  
Expected volatility 0.00% 102.00%
Expected dividends 0.00% 0.00%
Risk-free interest rate 0.00% 0.71%
Forfeitures 0.00% 0.00%
Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price   $ 0.12
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price   $ 0.09