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Preferred Stock, Common Stock and Warrants - Additional Information (Detail)
 1 Months Ended 2 Months Ended 12 Months Ended
Nov. 12, 2015
USD ($)
Jul. 23, 2015
shares
Feb. 26, 2015
shares
Nov. 04, 2008
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
shares
Jul. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
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   $ 0.001
Common stock, par value | $ / shares       $ 0.001     $ 0.001   $ 0.001
Dividends payable date       Nov. 17, 2008          
Preferred shares price | $ / shares       $ 6.00          
Rights expiration date       Nov. 17, 2018          
Common stock, shares outstanding             38,445,995   26,307,000
Proceeds from issuance of common stock, net | $             $ 183,897,000 $ 80,856,000  
Warrants outstanding             0    
Number of warrants exercised during period             383,000   11,000
Cowen                  
Class Of Stock [Line Items]                  
Issuance of common stock, (in shares)           2,125,439 0    
Proceeds from issuance of common stock, net | $           $ 49,000,000      
Minimum                  
Class Of Stock [Line Items]                  
Percentage of common shares outstanding       20.00%          
Percentage of assets       50.00%          
Maximum | Cowen                  
Class Of Stock [Line Items]                  
Common stock sales agreement aggregate sales proceeds | $ $ 90,000,000                
Common Stock                  
Class Of Stock [Line Items]                  
Convertible common stock shares   1,743,000 2,600,000            
Issuance of common stock, (in shares)             7,353,000 7,957,000  
Common Stock | IPO                  
Class Of Stock [Line Items]                  
Issuance of common stock, (in shares)         5,227,273        
Public offering net price per share | $ / shares         $ 27.50 $ 27.50      
Net proceeds from offering | $         $ 134,900,000        
Common Stock | Over-Allotment Option                  
Class Of Stock [Line Items]                  
Issuance of common stock, (in shares)         681,818        
Series B Convertible Preferred Stock                  
Class Of Stock [Line Items]                  
Preferred stock, shares outstanding   0         0   43,000
Convertible common stock shares   17,430 26,000            
Conversion of stock, shares converted             100    
Convertible common stock shares             0.01    
Preferred stock, par value | $ / shares             $ 0.001    
Convertible preferred stock, terms of conversion             The holder was 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.    
Maximum percentage of shares of common stock issued and outstanding from conversion of preferred stock             9.98%