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Stock-Based Compensation - Stock Options (Detail) - Stock Options
shares in Thousands
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Shares Under Option  
Outstanding at the beginning of the period (in shares) | shares 5,429 [1]
Granted (in shares) | shares 966
Exercised (in shares) | shares (1,758)
Cancelled (in shares) | shares (192)
Outstanding at the end of the period (in shares) | shares 4,445 [2]
Exercisable as of September 30, 2017 | shares 2,163
Weighted-Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 4.94 [1]
Granted (in dollars per share) | $ / shares 40.55
Exercised (in dollars per share) | $ / shares 1.01
Cancelled (in dollars per share) | $ / shares 17.17
Outstanding at the end of the period (in dollars per share) | $ / shares 13.71 [2]
Exercisable as of September 30, 2017 | $ / shares $ 3.63
[1] Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.
[2] Includes options to purchase 1,296 and 3,149 shares of Class A and Class B common stock, respectively.