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Stockholders Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2015
Nov. 30, 2010
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 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     $ (2,700,000) $ (3,500,000) $ 3,600,000 $ 12,500,000    
Proceeds from common stock sold         $ 75,324,000 $ 3,847,000    
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     2,000,000   2,000,000      
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         1,369,123      
Cantor | Sales Agreement                
Stockholders Equity Note [Line Items]                
Common stock, number of shares issued         0   4,300,000  
Maximum common stock offering price         $ 70,000,000      
Percentage of proceeds payable as compensation to underwriter         2.00%      
Proceeds from common stock sold         $ 18,600,000      
Common stock available for sale     $ 22,500,000   $ 22,500,000