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Preferred Stock, Common Stock and Warrants - Additional Information (Detail)
 6 Months Ended
Feb. 26, 2015
shares
Nov. 10, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Class Of Stock [Line Items]        
Preferred stock, shares authorized     5,000,000 5,000,000
Preferred stock, par value | $ / shares     $ 0.001 $ 0.001
Common stock, shares outstanding     30,237,147 26,307,000
Proceeds from issuance of common stock, net | $     $ 20,213,000  
Warrants to purchase common stock     0  
Number of warrants exercised during period     1,060,000  
Cowen        
Class Of Stock [Line Items]        
Issuance of common stock, (in shares)     929,590  
Proceeds from issuance of common stock, net | $     $ 20,200,000  
Maximum | Cowen        
Class Of Stock [Line Items]        
Common stock sales agreement aggregate sales proceeds | $   $ 50,000,000    
Commission on gross sales proceeds of common stock   3.00%    
Common Stock        
Class Of Stock [Line Items]        
Convertible common stock shares 2,600,000      
Warrant        
Class Of Stock [Line Items]        
Issuance of common stock, (in shares)     375,000  
Series B Convertible Preferred Stock        
Class Of Stock [Line Items]        
Preferred stock, shares outstanding     17,430 43,000
Preferred stock, par value | $ / shares     $ 0.001  
Convertible common stock shares 26,000      
Convertible common stock shares     0.01  
Conversion of stock, shares converted     100  
Convertible preferred stock, terms of conversion     The holder is prohibited from converting the Series B Convertible Preferred Stock into shares of common stock if, as a result of such conversion, the holder and its affiliates would own more than 9.98% of the total number of shares of common stock then issued and outstanding.  
Convertible preferred stock, settlement terms     In the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Convertible Preferred Stock will receive a payment equal to $0.001 per share before any proceeds are distributed to the common stockholders.  
Series B Convertible Preferred Stock        
Class Of Stock [Line Items]        
Maximum percentage of shares of common stock issued and outstanding from conversion of preferred stock     9.98%