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Capitalization - Convertible Preferred Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Feb. 29, 2016
Sep. 30, 2016
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]   4,667,000
Number of common stock shares repurchased 188,786 189,000 [1]
Share price (in dollars per share) $ 12.51  
Stock issued in net exercise of warrants (in shares) [1]   449,000
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    
Warrants net exercised (in shares) 808,135  
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  
Convertible Preferred Stock    
Convertible Preferred Stock    
Issuance of stock (in shares)   11,501,000
Number of preferred stock shares repurchased   12,384,000
Stock issued in net exercise of warrants (in shares)   789,000
Repurchase price including legal costs $ 51,800  
Carrying value of stock at the date of repurchase $ 4,600 $ 4,623
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  
[1] See Note7-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 in September 2016.