v3.6.0.2
Capitalization - Convertible Preferred Stock Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 26, 2016
Feb. 29, 2016
Feb. 28, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Convertible Preferred Stock            
Proceeds from stock issuance used to repurchase other shares   $ 54,000   $ 54,000   $ 561
Number of preferred stock shares repurchased     685,586      
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 2,000
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]   686,000 [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   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            
Issuance of stock (in shares)           8,371,000
Repurchase price including legal costs   $ 51,800        
Carrying value of stock at the date of repurchase   $ 4,600   $ 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 IPO in September 2016.