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Preferred Stock, Common Stock and Warrants - Additional Information (Detail)
 1 Months Ended 9 Months Ended
Jul. 27, 2015
USD ($)
$ / shares
shares
Jul. 23, 2015
shares
Feb. 26, 2015
shares
Nov. 10, 2014
USD ($)
Jul. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
shares
Dec. 31, 2014
shares
Class Of Stock [Line Items]              
Preferred stock, shares authorized           5,000,000 5,000,000
Preferred stock, shares outstanding           0  
Common stock, shares outstanding           38,425,277 26,307,000
Proceeds from issuance of common stock, net | $           $ 183,899,000  
Warrants to purchase common stock           0  
Cowen              
Class Of Stock [Line Items]              
Proceeds from issuance of common stock, net | $         $ 50,000,000 $ 49,000,000  
Issuance of common stock, (in shares)           2,125,439  
Maximum | Cowen              
Class Of Stock [Line Items]              
Common stock sales agreement aggregate sales proceeds | $       $ 50,000,000      
Common Stock              
Class Of Stock [Line Items]              
Convertible common stock shares   1,743,000 2,600,000        
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            
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        
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.  
Maximum percentage of shares of common stock issued and outstanding from conversion of preferred stock           9.98%