v3.6.0.2
Stock-Based Compensation - Stock Options (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options, additional disclosures        
Stock-based compensation expense $ 4,400 $ 5,056 $ 374 $ 4,545
Weighted average assumptions used to value options granted to employees        
Estimated dividend yield   0.00%    
Stock Options        
Shares Under Option        
Outstanding at the beginning of the period (in shares)   5,177    
Granted (in shares)   1,110    
Exercised (in shares)   (785)    
Cancelled (in shares)   (73)    
Outstanding at the end of the period (in shares)   5,429 [1] 5,177  
Exercisable as of December 31, 2016   3,148    
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)   $ 0.74    
Granted (in dollars per share)   21.35    
Exercised (in dollars per share)   0.63    
Cancelled (in dollars per share)   3.21    
Outstanding at the end of the period (in dollars per share)   4.94 $ 0.74  
Exercisable as of December 31, 2016   $ 0.58    
Stock Options, additional disclosures        
Weighted-Average Contractual Life, outstanding   7 years 1 month 6 days 7 years 4 months 24 days  
Weighted-Average Contractual Life, exercisable   5 years 9 months 18 days    
Aggregate Intrinsic Value, Outstanding   $ 124,243    
Aggregate Intrinsic Value, Exercisable   85,266    
Stock-based compensation expense   1,700 $ 400 $ 100
Unrecognized employee stock-based compensation   $ 13,000    
Unrecognized employee stock-based compensation, recognition period   3 years 7 months 6 days    
Weighted average assumptions used to value options granted to employees        
Expected term (years)   6 years 6 years 6 years
Volatility (as a percent)   58.10% 64.50% 62.50%
Risk-free interest rate (as a percent)   1.62% 1.62% 2.02%
Estimated dividend yield   0.00% 0.00% 0.00%
Weighted average grant date fair value per share   $ 11.61 $ 1.12 $ 0.48
[1] Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.