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Subsequent Event - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Nov. 03, 2014
Jul. 22, 2014
Feb. 10, 2014
Subsequent Event [Line Items]      
Common stock shares issued   6,250,000 1,945,525
Common stock issued, price per share   $ 1.92 $ 2.57
Proceeds from equity offering, gross   $ 12.0 $ 5.0
Term of agreement 3 years    
Subsequent Event
     
Subsequent Event [Line Items]      
Common stock shares issued 14,162,873    
Common stock issued, price per share $ 2.39    
Warrants to purchase common stock 9,205,862    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 4.00    
Proceeds from equity offering, gross $ 35.0    
Warrant exercisable period after closing of private placement 6 months    
Term of agreement 3 years