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Stock-Based Compensation - Stock Options (Detail) - Stock Options
shares in Thousands
 3 Months Ended
Mar. 31, 2017
$ / shares
shares
Shares Under Option  
Outstanding at the beginning of the period (in shares) | shares 5,429 [1]
Granted (in shares) | shares 44
Exercised (in shares) | shares (680)
Cancelled (in shares) | shares (126)
Outstanding at the end of the period (in shares) | shares 4,667 [2]
Exercisable as of March 31, 2017 | shares 2,710
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 29.60
Exercised (in dollars per share) | $ / shares 0.40
Cancelled (in dollars per share) | $ / shares 20.10
Outstanding at the end of the period (in dollars per share) | $ / shares 5.43 [2]
Exercisable as of March 31, 2017 | $ / shares $ 1.13
[1] Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.
[2] Includes options to purchase 393 and 4,274 shares of Class A and Class B common stock, respectively.