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Preferred Stock Warrants - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jul. 31, 2016
IPO
Apr. 30, 2016
USD ($)
shares
Aug. 31, 2014
USD ($)
shares
Aug. 31, 2013
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
May 31, 2016
shares
Mar. 31, 2016
shares
Class of Warrant or Right [Line Items]                  
Redeemable convertible preferred stock, shares issued | shares         0 77,185,117      
Proceeds from issuance of redeemable convertible preferred stock upon exercise of warrants         $ 22,488,000 $ 17,362,000 $ 9,000,000    
Remeasured fair value of warrants   $ 1,000,000              
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock         1,005,000        
Change in fair value of redeemable convertible preferred stock warrant liability         525,000 $ (543,000) $ 872,000    
Redeemable Convertible Preferred Stock Warrant Liability [Member]                  
Class of Warrant or Right [Line Items]                  
Reclassification of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock         $ 1,000,000        
Option Pricing Model [Member]                  
Class of Warrant or Right [Line Items]                  
Percentage of weighted value per share   67.00%              
PWERM [Member]                  
Class of Warrant or Right [Line Items]                  
Percentage of weighted value per share   33.00%              
Fair value assumptions probabilities, number of IPO scenarios | IPO 3                
First Tranche Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of convertible preferred stock issued upon exercise of stock warrants | shares       2,000,000          
Probability of exercisability percentage           95.00%      
Second Tranche Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Warrants issued date         Aug. 15, 2014        
Probability of exercisability percentage           0.00%      
Preferred Stock Warrant Liability [Member]                  
Class of Warrant or Right [Line Items]                  
Warrants outstanding, fair value           $ 480,000      
Risk-free interest rate   0.73%       0.90%      
Expected life   2 years       1 year 7 months 6 days      
Expected volatility   52.00%       57.00%      
Series B Redeemable Convertible Preferred Stock [Member]                  
Class of Warrant or Right [Line Items]                  
Number of convertible preferred stock issued upon exercise of stock warrants | shares       4,000,000          
Warrants exercise price | $ / shares       $ 0.01          
Percentage of warrants exercisable upon new product announcement       50.00%          
Risk-free interest rate     0.50%            
Expected life     0 years            
Probability of exercisability percentage     100.00%            
Redeemable convertible preferred stock, shares issued | shares   1,999,998 18,000,000            
Redeemable convertible preferred stock, warrants exercisable | shares                 2,000,000
Proceeds from issuance of redeemable convertible preferred stock upon exercise of warrants   $ 20,000 $ 9,000,000            
Number of redeemable convertible preferred stock expired unexercised | shares               2,000,000