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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding balance, number of shares 3,350,115 1,381,115
Granted, number of shares 1,150,500 1,969,000
Canceled/Forfeited, number of shares 358,667  
Outstanding balance, number of shares 4,141,948 3,350,115
Outstanding balance, weighted average exercise price per share $ 2.20 $ 2.35
Granted, weighted average exercise price per share $ 2.11 $ 2.10
Canceled/Forfeited, weighted average exercise price per share $ 2.18  
Outstanding balance, weighted average exercise price per share $ 2.48 $ 2.20
Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding balance, exercise price per share $ 2.00   
Granted, exercise price per share $ 2.05 $ 2.00
Canceled/Forfeited, exercise price per share $ 2.10  
Outstanding balance, exercise price per share $ 2.00 $ 2.00
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding balance, exercise price per share $ 2.79 $ 2.35
Granted, exercise price per share $ 2.65 $ 2.79
Canceled/Forfeited, exercise price per share $ 2.79  
Outstanding balance, exercise price per share $ 3.25 $ 2.79