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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding balance, number of shares 4,141,948
Granted, number of shares 780,000
Canceled/Forfeited, number of shares (58,333)
Outstanding balance, number of shares 4,863,615
Outstanding balance, weighted average exercise price per share $ 2.48
Granted, weighted average exercise price per share $ 3.66
Canceled/Forfeited, weighted average exercise price per share $ 2.05
Outstanding balance, weighted average exercise price per share $ 2.70
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 $ 2.90
Canceled/Forfeited, exercise price per share $ 2.05
Outstanding balance, exercise price per share $ 2.00
Maximum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding balance, exercise price per share $ 3.25
Granted, exercise price per share $ 3.75
Canceled/Forfeited, exercise price per share $ 2.05
Outstanding balance, exercise price per share $ 3.75