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Organization and Description of Business - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Aug. 16, 2016
$ / shares
shares
Jul. 31, 2016
Sep. 30, 2016
USD ($)
$ / shares
shares
Aug. 17, 2016
shares
Dec. 31, 2015
shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Reverse stock split description       In July 2016, the Company's board of directors approved an amendment to the Company's amended and restated certificate of incorporation to effect a reverse split of the Company's issued and outstanding common stock at a 1-for-14.5 ratio, which was effected on August 1, 2016.    
Reverse stock split effective date       Aug. 01, 2016    
Reverse stock split ratio     0.06896      
Proceeds from stock issuance, net of underwriting discounts, commissions | $       $ 84,508    
Number of shares converted         8,577,571  
Preferred stock outstanding 0     0   0
Initial Public Offering [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Proceeds from stock issuance, net of underwriting discounts, commissions | $ $ 83,600          
Common stock issued 252,972 7,500,000        
Common stock price per share | $ / shares $ 12.00 $ 12.00   $ 12.00    
Redeemable Convertible Preferred Stock [Member] | Initial Public Offering [Member]            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Number of shares converted   8,577,571        
Preferred stock outstanding   0