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Capitalization - Convertible Preferred Stock Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 26, 2016
Feb. 29, 2016
Dec. 31, 2016
Dec. 31, 2015
Convertible Preferred Stock        
Proceeds from issuance of shares     $ 60,000  
Proceeds from stock issuance used to repurchase other shares   $ 54,000 54,000  
Preferred stock repurchase price per share, as a percentage of the Series C offering price   80.00%    
Repurchase price of convertible preferred stock in excess of carrying value   $ 47,200 $ 47,209  
Common Stock        
Convertible Preferred Stock        
Issuance of stock (in shares) [1]       7,000
Stock issued in net exercise of warrants (in shares) [1]     449,000  
Share price (in dollars per share)   $ 12.51    
Number of common stock shares repurchased   188,786 189,000 [1]  
Additional Paid-In Capital        
Convertible Preferred Stock        
Repurchase price of convertible preferred stock in excess of carrying value   $ 1,200 $ 1,168  
Retained Earnings (Accumulated Deficit)        
Convertible Preferred Stock        
Repurchase price of convertible preferred stock in excess of carrying value   $ 46,000 46,041  
Series Seed preferred stock warrants        
Convertible Preferred Stock        
Stock issued in net exercise of warrants (in shares)   788,755    
Repurchase of stock that was issued in net exercise of warrants (in shares)   614,052    
Warrants net exercised (in shares)   808,135    
Series C convertible preferred stock        
Convertible Preferred Stock        
Issuance of stock (in shares)   11,500,587    
Proceeds from issuance of shares   $ 60,000    
Share price (in dollars per share)   $ 5.22    
Series Seed convertible preferred stock        
Convertible Preferred Stock        
Number of preferred stock shares repurchased   3,897,928    
Stock issued in net exercise of warrants (in shares)   788,755    
Repurchase of stock that was issued in net exercise of warrants (in shares)   614,052    
Series A convertible preferred stock        
Convertible Preferred Stock        
Number of preferred stock shares repurchased   8,485,350    
Convertible Preferred Stock        
Convertible Preferred Stock        
Repurchase price including legal costs   $ 51,800    
Carrying value of stock at the date of repurchase   $ 4,600    
Repurchase price of convertible preferred stock in excess of carrying value     $ 4,623  
Class B common stock        
Convertible Preferred Stock        
Stock issued in net exercise of warrants (in shares) 448,545      
Number of shares issued for automatic conversion of convertible preferred stock 22,078,637      
Number of common stock shares issued for each share of convertible preferred stock 0.3333      
[1] See Note 9-Capitalization for discussion of the establishment of the Company’s two classes of common stock and the reclassification of its common stock into Class B common stock prior to the Company’s initial public offering (“IPO”) in September 2016.