XML 58 R36.htm IDEA: XBRL DOCUMENT v3.7.0.1
Organization and Description of Business - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Aug. 16, 2016
$ / shares
shares
Jul. 31, 2016
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
shares
Dec. 31, 2013
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 | $       $ 83,648      
Number of shares converted   8,577,571          
Preferred stock outstanding       0 77,185,117    
Accumulated deficit | $       $ (64,593) $ (27,416)    
Cash, cash equivalents and available-for-sale securities | $       $ 87,700      
Common Stock [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Common stock issued       7,752,972      
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          
Initial Public Offering [Member] | Common Stock [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of shares converted   8,577,571          
Redeemable Convertible Preferred Stock [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Preferred stock outstanding         77,185,117 42,037,500 24,037,500
Redeemable Convertible Preferred Stock [Member] | Initial Public Offering [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Preferred stock outstanding   0