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Stockholders Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2015
Nov. 30, 2010
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Aug. 31, 2009
Stockholders Equity Note [Line Items]              
Common stock, number of shares issued 14,636,363            
Common stock, par value $ 0.001            
Public offering, price per share $ 5.50            
Estimated Net proceeds from public offering $ 75,400,000            
Underwriting discounts and other issuance costs $ 5,100,000            
(Loss) gain from Revaluation of warrant     $ 1,100,000 $ 1,700,000 $ 4,700,000 $ 14,300,000  
2009 Unit Offering              
Stockholders Equity Note [Line Items]              
Warrants to purchase an aggregate shares of common stock             2,400,000
Warrant exercise price             $ 2.90
2010 Unit Offering              
Stockholders Equity Note [Line Items]              
Warrants to purchase an aggregate shares of common stock   3,700,000          
Warrant exercise price   $ 3.20          
Common stock warrants to purchase outstanding     1,800,000   1,800,000    
2010 Unit Offering | Warrants              
Stockholders Equity Note [Line Items]              
Warrants exercisable date   May 15, 2011          
Exercisable period   5 years          
Common stock issued from the exercise of outstanding warrants     175,000   1,544,123    
Cantor | Sales Agreement              
Stockholders Equity Note [Line Items]              
Common stock, number of shares issued         0    
Maximum common stock offering price         $ 70,000,000    
Percentage of proceeds payable as compensation to underwriter         2.00%    
Common stock available for sale     $ 22,500,000   $ 22,500,000